WO2011039584A2 - Peptides - Google Patents
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- WO2011039584A2 WO2011039584A2 PCT/IB2010/002142 IB2010002142W WO2011039584A2 WO 2011039584 A2 WO2011039584 A2 WO 2011039584A2 IB 2010002142 W IB2010002142 W IB 2010002142W WO 2011039584 A2 WO2011039584 A2 WO 2011039584A2
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- parstatin
- ischemia
- isolated peptide
- angiogenesis
- renal
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- the present invention relates to parstatin peptides, compositions comprising parstatin peptides and their use in the treatment of various disorders, including angiogenesis- related diseases, ocular neovascularization and related disease states, ischemia- reperfusion injury, myocardial-related disease states and renal disorders. BACKGROUND OF THE INVENTION
- Angiogenesis and Neovascular Ocular Diseases A1. Angiogenesis and angiogenesis-related diseases
- Angiogenesis is the generation of new blood vessels in a tissue or organ (Carmeliet, 2005, Nature, 438: 932-936). Under normal physiological conditions, humans and animals undergo angiogenesis only in very specific and restricted situations. For example, angiogenesis is normally observed in wound healing, fetal and embryonic development, and. formation of the corpus luteum, endometrium and_pJacenta.
- Angiogenesis is controlled through a highly regulated system of angiogenic stimulators and inhibitors (Yancopoulos et al., 2000, Nature, 407: 242-248). Angiogenesis is turned on by specific angiogenic molecules such as basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), angiogenin, transforming growth factor, tumor necrosis factor-alpha (TNF-alpha) and platelet derived growth factor (PDGF). On the other hand, angiogenesis can be suppressed by inhibitory molecules such as interferon-a, thrombospondin-1 , angiostatin, and endostatin. It is the balance of these naturally occurring stimulators and inhibitors that controls the normally quiescent capillary vasculature. When this balance is upset, as in certain disease states, capillary endothelial cells are induced to proliferate, migrate and ultimately differentiate.
- bFGF basic fibroblast growth factor
- VEGF vascular endothelial growth factor
- angiogenesis The control of angiogenesis has been found to be altered in certain disease states and, in many cases, the underlying pathology associated with the diseases is related to uncontrolled angiogenesis. Both controlled and uncontrolled angiogenesis are thought to proceed in a similar manner. Endothelial cells and pericytes, surrounded by a basement membrane, form capillary blood vessels. Angiogenesis begins with the local dissolution of the basement membrane by enzymes released by endothelial cells and leukocytes. Endothelial cells, lining the lumen of blood vessels, then protrude through the basement membrane. Angiogenic stimuli promote endothelial cell migration through the eroded basement membrane.
- the migrating cells form a "sprout" off the parent blood vessel where the endothelial cells undergo mitosis and proliferate.
- the endothelial sprouts merge with each other to form capillary loops, creating a new blood vessel.
- Persistent, upregulated angiogenesis occurs in many disease states, including tumor growth metastases.
- the diverse pathological diseases states in which upregulated angiogenesis is present have been grouped together as angiogenic-diseases, angiogenesis-associated or angiogenesis-related diseases.
- ocular neovascular diseases ocular neovascular diseases
- these diseases are characterized by invasion of new blood vessels into the structure of the eye, such as the retina or cornea. They are the most common cause of blindness and comprise approximately twenty eye diseases.
- the associated visual problems are caused by an ingrowth of choroidal capillaries through defects in Bruch's membrane, with proliferation of fibrovascular tissue beneath the retinal pigment epithelium.
- Angiogenic damage is also associated with diabetic retinopathy, retinopathy of prematurity, corneal graft rejection, neovascular glaucoma, and retrolental fibroplasias.
- corneal neovascularization include, but are not limited to, epidemic keratoconjunctivitis, Vitamin A deficiency, contact lens overwear, atopic keratitis, superior limbic keratitis, and pterygium keratitis sicca.
- angiogenesis-related disease is rheumatoid arthritis (Bainbridge et al., 2006, Curr Pharm Des, 12: 2631-2644).
- the blood vessels in the synovial lining of the joints undergo angiogenesis.
- the endothelial cells release factors and reactive oxygen species that lead to pannus growth and cartilage destruction.
- Angiogenesis may also play a role in osteoarthritis.
- the activation of the chondrocytes by angiogenic-related factors contributes to the destruction of the joint. At a later stage, the angiogenic factors promote new bone growth.
- Therapeutic intervention that prevents the cartilage destruction could halt the progress of the diseases and provide relief for persons suffering from arthritis.
- Chronic inflammation may also involve pathological angiogenesis.
- pathological angiogenesis Such disease as ulcerative colitis and Crohn's disease show histological changes with the ingrowth of new blood vessels into inflamed tissue.
- Bartonellosis a bacterial infection found in South America, in a chronic stage is characterized by proliferation of vascular endothelial cells.
- angiogenesis is essential for the growth and persistence of solid tumors and their metastases.
- tumors upregulate the production of a variety of angiogenic factors, including the bFGF and VEGF (Yancopoulos et al., 2000, Nature, 407: 242-248).
- angiogenesis many malignant tumors also generate inhibitors of angiogenesis, including angiostatin, endostastin, and thrombospondin (Nyberg et al., 2005, Cancer Res, 65: 3967-3979). It is postulated that the angiogenic phenotype is the result of a net balance between these positive and negative regulators of neovascularization.
- endogenous inhibitors of angiogenesis have been identified, although not all are associated with the presence of a tumor.
- platelet factor 4 interferon-alpha
- interferon-inducible protein 10 which is induced by interleukin-12 and/or interferon-gamma
- the 16 kDa N-terminal fragment of prolactin tumstatin, arresten, canesten, anastellin, vasostatin, and vasohibin.
- Pathologies or aberrant angiogenesis/neovascularization,- aberrant remodeling, fibrosis and scarring and inflammation occur in association with retinal and ocular ischemic diseases such as age-related macular degeneration (AMD), diabetic retinopathy (DR) and in retinopathy of prematurity (ROP) and other developmental disorders (Eichler et al., 2006, Curr Pharm Des, 12: 2645-60) as well as being a result of infections and mechanical or chemical injury to the cornea and the eye in general (Ciulla et al., 2001 , Curr Opin Opthalmol, 12: 442-9; Dart et al., 2003, Eye, 17: 886-92).
- AMD age-related macular degeneration
- DR diabetic retinopathy
- ROP retinopathy of prematurity
- Diabetic retinopathy is a leading cause of blindness in adults of working age.
- the leading cause of vision loss for Americans under the age of 65 is diabetes; 16 million individuals in the United States are diabetic and 40,000 per year suffer from ocular complications of the disease, often a result of retinal neovascularization.
- DR retinal microvascular disease that is manifested as a cascade of stages with increasing levels of severity and a worsening prognosis for vision.
- DR is broadly classified into 2 major clinical stages: nonproliferative diabetic retinopathy and proliferative diabetic retinopathy (PDR), where the term "proliferative” refers to the presence of preretinal neovascularization (PNV) emanating from the retina into the vitreous.
- PNV preretinal neovascularization
- Ocular neovascularization occurs in areas where capillary occlusions have developed, creating areas of ischemic retina and acting as a stimulus for neovascular proliferation that originate from pre-existing retinal venules at the optic disk and/or elsewhere in the retina posterior to the equator of the eye.
- Vitreous haemorrhage and tractional retinal detachment from PDR can cause severe vision loss (Boulton et al., 1997, Br J Ophthalmol, 81: 228-223).
- Diabetic macular edema (DME) is a further common cause of blindness (Levin, 2001 , J Glaucoma 10:19-21 ; Stefansson et al., 1992, Am J Ophthalmol. 113:36-38).
- a clinical hallmark of PDR includes the increased vascular permeability, leading to DME, and endothelial cell proliferation.
- Age-related macular degeneration is a leading cause of vision loss in people over 65 years old.
- AMD affects 12-15 million American over the age of 65 and causes vision loss in 10-15% of them.
- AMD is associated with neovascularization originating from the choroidal vasculature and extending into the subretinal space.
- Choroidal neovascularization causes severe vision loss in AMD patients because it occurs in the macula, the area of retina responsible for central vision (Kitaoka et al., 1997, Curr Eye Res, 16:396-399).
- Retinopathy of prematurity occurs most prominently in premature neonates.
- the retina becomes completely vascularized at full term/near birth.
- the retina remains incompletely vascularized at the time of birth.
- vasculogenesis in the premature neonatal retina becomes disrupted.
- Abnormal new proliferating vessels develop at the juncture of vascularized and avascular retina. These abnormal new vessels grow from the retina into the vitreous, resulting in haemorrhage and tractional detachment of the retina (Neely et al., 1998, Am. J. Pathol, 153:665-670). It is estimated that visual impairment from this disease affects 3400 infants and causes blindness in 650 infants annually in the United States. Angiogenests is the hallmark of this debilitating condition.
- retinal diseases associated with retinal neovascularization include sickle cell retinopathy, retinal vein occlusion, certain inflammatory diseases of the eye, ocular tumorigenesis, Eale's disease, myopic choriodal neovascularization, and polypoidal choriodal vasculopathy. These, however, account for a much smaller proportion of visual loss caused by ocular neovascularization (Neely et al., 1998, American J. of Path. 153:665-670).
- Corneal neovascularization the abnormal formation of blood vessels in the cornea, is a common and serious complication of many corneal diseases and is a major cause of blindness that affects millions of people (Adamis, 2005, Retina, 25: 111-118). The condition is associated with severe visual impairment and is a high risk factor for graft rejection after allograft corneal transplantation. In addition, corneal neovascularization and subsequent opacification remain the most frequent causes of blindness after severe alkali burn trauma. To date, there are no pharmacological or surgical treatment options for the inhibition of corneal neovascularization that have been proven to be both safe and effective.
- the inflammatory response can lead to oedema, lipid deposition and corneal scarring that may not only significantly alter visual acuity, but also worsen the prognosis of subsequent penetrating keratoplasty.
- longer-term use of these drugs can lead to various adverse side effects such as cataracts, glaucoma, infection, and delay corneal epithelial healing.
- VEGF plays a dominant role in iris neovascularization and neovascular retinopathies. While reports clearly show a correlation between intraocular VEGF levels and ischemic retinopathic ocular neovascularization, FGF likely plays an essential role. Basic FGF is known to be present in the normal adult retina, even though detectable levels are not consistently correlated with neovascularization. This may be largely due to the fact that FGF binds very tightly to charged components of the extracellular matrix and may not be readily available in a freely diffusible form that would be detected by standard assays of intraocular fluids.
- the approved treatments for AMD are photodynamic therapy with VISUDYNE® (QLT/Novartis) and intravitreal injection of Macugen® (pegaptanib) (Eyetech/Pfizer) or Lucentis® (ranibizumab) (Genentech).
- Laser photocoagulation alone or photodynamic therapy with VISUDYNE® are therapies that involve laser-induced occlusion of the affected vasculature, which can result in localized damage to the retina.
- Macugen® (Eyetech/Pfizer) is an anti-VEGF aptamer that binds to VEGF165 preventing ligand-receptor interaction and is labeled for intravitreal injections every 4 weeks.
- Lucentis® (Genentech) is a humanized anti-VEGF antibody fragment that also binds directly to all isoforms of human VEGF and is labeled for intravitreal injections every 6 weeks.
- pharmacologic therapies are undergoing clinical evaluation for AMD, such as RETAANE® 15 mg (anecortave acetate suspension, Alcon Research, Ltd.), Envision (squalamine, Genera), the VEGF R1 R2 Trap, (Regeneron), Cand5 (anti- VEGF siRNA, Acuity), Sirna-027 (anti-VEGFR1 siRNA, SIRNA/Allergan), a topical receptor tyrosine kinase antagonist (TargeGen), sirolimus (rapamycin, MacuSight), etc.
- Multifocal laser photocoagulation may reduce- retinal ischemia and inhibit angiogerresrs by destroying healthy tissue and thus decreasing the total metabolic-demand of the retina.
- Laser photocoagulation may also modulate the expression and production of various cytokines and trophic factors.
- laser photocoagulation is a cytodestructive procedure and the visual field of the treated eye is irreversibly compromised. Surgical interventions, such as vitrectomy and removal of preretinal membranes, are widely used with or without laser treatment.
- DME digital mesyleukin
- ARXXANTTM ruboxystaurin mesylate, Lilly
- RETISERTTM fluocinolone acetonide, Bausch & Lomb
- Posurdex fluocinolone acetonide erodible implant, Occulex/Allergan
- l-vation nononerodible Dexamethasone implant, Occulex
- Medidur fluocinolone acetonide erodible implant, Alimera
- Intravitreal or periocular injection of triamcinolone acetonide, a corticosteroid (Kenalog®, Schering-Plough), and intravitreal Avastin® (anti-VEGF Mab (bevacizumab), Genentech) are also being used "off-label" for the treatment of both macular edema and wet AMD.
- Anti-VEGF therapies represent a recent, significant advance in the treatment of exudative AMD.
- phase III VISION Trial with PEGAPTANIB a high affinity aptamer which selectively inhibits the 165 isoform of VEGF-A
- the average patient continues to lose vision and only a small percent gained vision
- Inhibition of all isoforms of VEGF-A (pan-VEGF inhibition) with the antibody fragment RAN1BIZUMAB yielded much more impressive results (Brown et al., 2006, N Eng J Med, 355:1432-44; Rosenfeld et al., 2006, N Eng J Med 355:1419-31).
- the 2 year MARINA trial and the 1 year ANCHOR trial demonstrated that approximately 40% of patients achieve some visual gain. Although these results represent a major advance in our ability to treat exudative AMD, they also demonstrate that 60% of patients do not have visual improvement. Furthermore, these patients had to meet strictly defined inclusion and exclusion criteria. The results in a larger patient population may be less robust.
- Ischemia-reperfusion injury refers to an event in which the blood supply to a tissue is obstructed, such as myocardial infarction. Whenever there is a transient decrease or interruption of blood flow the net injury is the sum of two components: the "direct” injury occurring during the ischemic interval and the "indirect” or reperfusion injury which follows.
- Reperfusion injury can be defined as the damage that occurs to an organ that is caused by the resumption of blood flow after an episode of ischemia. This damage is distinct from the injury resulting from the ischemia per se.
- reperfusion injury is that it may be attenuated by interventions initiated before or during the reperfusion.
- Reperfusion injury results from several complex and interdependent mechanisms that involve the production of reactive oxygen species, endothelial cell dysfunction, microvascular injury, alterations in intracellular Ca 2+ handling, changes in tissue metabolism, and activation of neutrophils, platelets, cytokines and the complement system. All of the deleterious consequences associated with reperfusion constitute a spectrum of reperfusion-associated pathologies that are collectively called reperfusion injury. Reperfusion injury can extend not only acutely, but also over several days following the tissue attack.
- the restored blood flow reintroduces oxygen within cells that damages cellular proteins, DNA and the plasma membranes. Damage of the cell membrane may in turn causes release of more free radicals signaling apoptosis. Leukocytes may also build up in small capillaries, obstructing them and leading to more ischemia.
- Cardiovascular disease is the leading cause of death in the western world. Coronary artery disease can lead to prolonged or irreversible episodes of cardiac ischemia that result in myocardial infarction (Ml) which is associated with a high rate of mortality.
- Ml myocardial infarction
- the reduced blood flow in heart diseases is typically caused by blockage of a vessel by an embolus (blood clot); the blockage of a vessel due to atherosclerosis; the breakage of a blood vessel (a bleeding stroke); the blockage of a blood vessel due to vasoconstriction such as occurs during vasospasms and possibly, during transient ischemic attacks (TIA) and following subarachnoid haemorrhage.
- Conditions in which ischemia occurs further include myocardial infarction; trauma; and during cardiac and thoracic surgery and neurosurgery (blood flow needs to be reduced or stopped to achieve the aims of surgery).
- Procedures that can cause myocardial ischemia include coronary thrombolysis, coronary angioplasty (with or without stent placement), and coronary artery bypass grafts.
- myocardial infarct stoppage of the heart or damage occurs which reduces the flow of blood to myocardium, and ischemia results.
- Cardiac tissue itself is also subjected to ischemic damage.
- reduction of blood flow, clots or air bubbles generated can lead to significant ischemic damage of the myocardium.
- ischemic event there is a gradation of injury that arises from the ischemic site.
- Cells at the site of blood flow restriction undergo necrosis and form the core of a lesion.
- a penumbra is formed around the core where the injury is not immediately fatal but progresses slowly toward cell death. This progression to cell death may be reversed upon reestablishment of blood flow within a short time of the ischemic event.
- Timely reperfusion to reduce the duration of ischemia is the definitive treatment to prevent cellular injury and necrosis in an ischemic myocardium.
- reperfusion after a short episode of myocardial ischemia (up to 15 min), is followed by the rapid restoration of cellular metabolism and function.
- ARF acute renal failure
- ARI acute renal injury
- AKI acute kidney injury
- ARF is a clinical syndrome characterized by rapid deterioration of renal function that occurs within days.
- ARF is estimated to occur in at least 5% of all hospitalized patients, and in 30-50% of those admitted to the intensive care unit.
- ARF secondary to a renal tubular cell injury, including an ischemic injury or a nephrotoxic injury remains a common and potentially devastating problem in clinical medicine and nephrology, with a persistently high rate of mortality and morbidity despite significant advances in supportive care (Chatterjee and Thiemermann, 2003, Expert Opin Emerg Drugs, 8: 389-435).
- ARF-acute tubular necrosis-is most frequently observed in the setting of renal ischemia reperfusion injury, post-renal transplant, sepsis, post- myocardial infarct, in the elderly with diminished fluid intake, and as a consequence of exposure to radiocontrast agents and a wide range of toxins, including cis-platinum, aminoglycosides, amphotericin B, and acyclovir.
- Renal ischemia-reperfusion injury refers to an event in which the blood supply to kidneys is obstructed, such as renal occlusion (Chatterjee, 2007, Naunyn-Schmiedeberg's Arch Pharmacol, 376: 1-43).
- Reperfusion injury can be defined as the damage that occurs to kidney that is caused by the resumption of blood flow after an episode of ischemia. This damage is distinct from the injury resulting from the ischemia per se.
- Renal ischemia- reperfusion injury results from several complex and interdependent mechanisms that involve the production of reactive oxygen species, endothelial cell dysfunction, microvascular injury, alterations in intracellular Ca 2+ handling, changes in tissue metabolism, and activation of neutrophils, platelets, cytokines and the complement system. All of the deleterious consequences associated with reperfusion constitute a spectrum of reperfusion-associated pathologies that are collectively called reperfusion injury. Reperfusion injury can extend not only acutely, but also over several days following the tissue attack.
- the restored blood flow reintroduces oxygen within cells that damages cellular proteins, DNA, and the plasma membranes. Damage of the cell membrane may in turn promotes release of more free radicals signaling apoptosis. Leukocytes may also built up in small capillaries obstructing them and leading to more ischemia.
- ischemic event there is a gradation of injury that arises from the ischemic site.
- Cells at the site of blood flow restriction undergo necrosis and form the core of a lesion.
- a penumbra is formed around the core where the injury is not immediately fatal but progresses slowly toward cell death. This progression to cell death may be reversed upon reestablishment of blood flow within a short time of the ischemic event.
- Timely reperfusion to reduce the duration of ischemia is the definitive treatment to prevent cellular injury and necrosis in an ischemic kidney.
- reperfusion after a short episode of renal ischemia (up to 30 min), is followed by the rapid restoration of cellular metabolism and function.
- acute kidney injury may be the result of renal ischemia- reperfusion injury (ischemia-reperfusion) that occurs, for example, in patients undergoing major surgery such as major cardiac surgery (Padanilam, 2003, Am J Physiol, 284: F608- F627).
- Renal ischemia is a major cause of acute kidney injury.
- reperfusion is essential for the survival of ischemic tissue, there is strong evidence that reperfusion itself caused additional cellular injury and together ischemia-reperfusion of the kidney leads to ischemic ARF.
- Renal ischemia-reperfusion injury is caused by multiple insults involving tubular cell apoptosis, oxygen free radical formation, mitochondrial dysfunction, inflammatory cytokine generation and neutrophils sequestration.
- Contrast-induced nephropathy is generally recognized as acute renal failure occurring within 48 hours of exposure to intravascular contrast material, and where other causes of renal failure are not attributable. Its presence is generally determined when an increase in serum creatinine levels is exhibited in a subject who has been exposed to- intravascular contrast material. CIN is an important problem in clinical practice and contrast-induced morbidity has become a significant cause of hospital morbidity and mortality with the increasing use of iodinated contrast media in diagnostic imaging and interventional procedures such as angiography. In 2003, over 80 million doses of iodinated intravascular contrast media were administrated, corresponding to approximately 8 million liters according to Katzberg et al. (2006, Kidney International, 69: S3-S7).
- CIN has become the third leading cause of hospital-acquired acute renal failure, accounting for 10 to 25% of all acute renal failure cases, despite the introduction of newer and safer contrast media, the improvement of hydration protocols, and the introduction of additional preventive strategies.
- contrast agents there are different classes of contrast agents in use such as:
- High osmolar agents such as lothalamate and Diatrizoate.
- the osmolality of these agents is about 5 times greater than the osmolality of blood.
- Low osmolar agents such as lohexyl, loversol, lopamidol, lopromide, lomeprol and loxaglate.
- the osmolality of these agents is about 2-3 times greater than the osmolality of biood.
- Iso-osmolar agents such as lotrolan and iodixanol.
- the osmolality of these agents is the same as the osmolality of blood.
- Thrombin is a serine protease, which plays a pivotal role in haemostasis. It acts as procoagulant converting fibrinogen into fibrin that anchors platelets at the site of lesion and stabilizes the clot by activating factor XIII and enhances its own generation from prothrombin by activation of factors V, VIII and XI. On the other hand, thrombin acts as an anti-coagulant by activating protein C (Di Cera, 2003).
- thrombin has important roles in the initiation of angiogenesis (Tsopanoglou and Maragoudakis, 2004, Sem Thromb Hemost, 30: 63-69). Thrombin's angiogenic activity is mostly independent of its coagulant activity and is more dependent on signaling via the protease-activated receptors 1 (PARI ). This supported by the observations obtained in mouse models, wherein a lack of thrombin generation (TF-/-, FX-/-, FV-/-, FN-/-) results in severe vascular defects in embryonic development ( oser and Patterson, 2003, Arterioscler Thromb Vase Biol, 23: 922-930). Similar phenotypes occur in models of impaired thrombin binding to its PAR receptor (PARI-/-).
- Protease-activated receptors consists a family of G protein-coupled receptors which can be activated by proteolytic cleavage of their N-terminal extracellular domain (Ossovskaya and Bunnett, 2004, Physiol Rev, 84: 579-621 ).
- PARI is the first member of this family " to be cloned in which the extracellular amino terminus is cleaved to expose a new amino terminus that is involved in receptor activation (Vu et al., 1991 , Cell, 64: 1057- 1068). Subsequently, three other members of this receptor family have been identified, designated as PAR2, PAR3 and PAR4.
- Proteolytic cleavage at the R 4 i/S 42 bond of human PARI by thrombin releases a 41 amino acid peptide and unveils a tethered peptide ligand with the recognition sequence SFLLRN.
- This sequence binds to conserved regions in the second extracellular loop of the cleaved receptor, resulting in the initiation of signal transduction.
- thrombin but also other molecules, such as plasmin, factor Xa, activated protein C, as well as matrix metalloprotease-1 , might be able to activate this receptor under certain conditions and induce down-stream signals (Leger et al., 2006, Circulation, 114: 1070-1077).
- Thrombin through PARI signaling, interacts and stimulates a variety of vascular cells including, but is not limited to, platelets, endothelial cells, smooth muscle cells and regulates the release, expression and activation of the majority of angiogenesis mediators.
- thrombin-induced angiogenesis in a chick chorioallontoic membrane system is associated with up-regulation of VEGF as well as angiopoietin-2 (Ang-2) (Caunt et al, 2003, J Thromb Haemost, 1 : 2097-2102).
- thrombin up-regulates VEGF (Huang et al, 2001 , Thromb Haemost, 86: 1094-1098), Ang- 2 (Huang et al., 2002, Blood, 99: 1646-1650) and the major VEGF receptor KDR (Tsopanoglou and Maragoudakis, 999, J Biol Chem, 274: 23969-23976), and activates metalloproteinase-2 (Zucher et al., 1995, J Biol Chem, 270: 23730-23738).
- thrombin markedly up-regulates growth-regulated oncogene-a and this chemokine in turn mediateslhre thrombin-induced increase of vascular regulatory proteins- (M P-1 , MMP-2), growth factors (VEGF, Ang-2), and receptors (KDR) (Caunt et al r 2006, Cancer Res, 66: 4125-4132).
- M P-1 vascular regulatory proteins
- VEGF growth factors
- Ang-2 receptors
- KDR receptors
- thrombin regulates in an opposing fashion the release of VEGF and endostatin (the potent endogenous inhibitor of angiogenesis) in platelets (Ma et al., 2005, Proc Natl Acad Sci USA, 102: 216-220). Thrombin has also been shown to activate the proliferation of endothelial cells by acting directly as mitogenic factor (Olivot et al., 2001 , Circ Res, 88: 681-687).
- thrombin plays an important role in angiogenesis, suggests a crucial role for thrombin and its receptor, PARI in tumor progression and metastasis (Nierodzik and Karpatkin, 2006, Cancer Cell, 10: 355-362).
- PARI thrombin and its receptor
- Thrombin through PARI signaling, contributes to a more malignant phenotype by activating platelet-tumor aggregation, tumor adhesion to subendothelial matrix, tumor growth and metastasis.
- PARI expressed on platelets and the vascular endothelium, has been shown to play important roles in normal blood vessel biology (Coughlin, 2005, J Thromb Hemost, 3: 1800-1814) and to contribute to the pathogenesis of several cardiovascular diseases including atherosclerosis, restenosis and thrombosis (Leger et al., 2006, Circulation, 114: 1070-1077).
- aberrant over-expression of PARI has been documented in the endothelium and vascular smooth muscle cells of human atheroscrerotic arteries, including regions of intimal thickening (Nelken et al., 1992, J Clin Invest, 90: 1614-1621).
- PARI Activation of PARI triggers mitogenic responses in smooth muscle cells and fibroblast and angiogenesis.
- Targeting PARI with a blocking antibody reduced intimal hyperplasia by approximately 50% in a catheter-induced injury model of restenosis (Takada et al., 1998, Circ Res, 82: 980-987).
- PARI deficiency also reduced restenosis in arterial injury models (Cheung et al., 1999, Arterioscler Thromb Vase Biol, 19: 3014-3024). Recently, it has been shown that thrombin contributes to ischemia/reperfusion injury independently of its effects on platelets and fibrinogen.
- the present invention seeks to provide novel peptides derived from parstatin, together with new therapeutic applications for full length parstatin peptide and various peptide fragments thereof.
- a first aspect of the invention relates to an isolated peptide comprising a sequence selected from SEQ ID NO:1 (1-41), SEQ ID NO:9 (1-26) and SEQ ID NO:4 (24-41), or a variant, derivative, .fragment or homologue thereof.
- a second aspect of the invention relates to a composition comprising an isolated peptide as described above and a pharmaceutically acceptable diluent, excipient or carrier.
- a third aspect of the invention relates to an isolated peptide or a composition as described above for use as a medicament.
- a fourth aspect of the invention relates to an isolated peptide or a composition as described above for preventing, ameliorating or treating a renal disorder.
- a fifth aspect of the invention relates to the use of an isolated peptide or a composition as described above in the preparation of a medicament for the treatment of a renal disorder.
- a sixth aspect of the invention relates to the use of an isolated peptide or a composition as described above as a renal protective agent.
- a seventh aspect of the invention relates to a method of preventing or treating a renal disorder in a subject, said method comprising administering to the subject an isolated peptide or a composition as described above.
- An eighth aspect of the invention relates to an isolated peptide or a composition as described above for preventing, ameliorating or treating-angiogenesis or an angiogenesis associated disease.
- a ninth aspect of the invention relates to an isolated peptide or a composition as described above in the preparation of a medicament for the treatment of angiogenesis or an angiogenesis associated disease.
- a tenth aspect of the invention relates to the use of an isolated peptide or a composition as described above for inhibiting angiogenesis.
- An eleventh aspect of the invention relates to a method of preventing or treating angiogenesis or an angiogenesis associated disease in a subject, said method comprising administering to the subject an isolated peptide or a composition as described above.
- a twelfth aspect of the invention relates to an isolated peptide or a composition described above for preventing, ameliorating or treating myocardial-related disease ischemia-reperfusion injury.
- a thirteenth aspect of the invention relates to the use of an isolated peptide or a composition as described above in the preparation of a medicament for the treatment of myocardial-related disease or ischemia-reperfusion injury.
- a fourteenth aspect of the invention relates to the use of an isolated peptide or a composition as described above as a myocardial protective agent.
- a fifteenth aspect of the invention relates to a method of preventing or treating myocardial-related disease or ischemia-reperfusion injury in a subject, said method comprising administering to the subject an isolated peptide or a composition as described above.
- a sixteenth aspect of the invention relates to an isolated peptide or a composition as described above for preventing or inhibiting endothelial cell growth.
- a seventeenth aspect of the invention relates to the use of an isolated peptide, or a composition as described above in the preparation of a medicament for preventing or inhibiting endothelial cell growth.
- An eighteenth aspect of the invention relates to a method of inducing cell death and/or apoptosis or cell cycle arrest in mammalian endothelial cells, said method comprising contacting mammalian endothelial cells with an isolated peptide or a composition as described above.
- a ninteenth aspect of the invention relates to a nucleic acid sequence encoding a peptide as defined above, or a variant derivative, fragment or homologue thereof.
- a twentieth aspect relates to a nucleic acid sequence which is complementary to the nucleotide sequence of the invention, or a variant, derivative, fragment or homologue thereof.
- a further aspect of the invention relates to an antibody targeted to a peptide as described above, or a variant, derivative, fragment or homologue thereof.
- a further aspect of the invention relates to a kit comprising an antibody as described above.
- FIGURE 1 Parstatin (1-41) inhibits angiogenesis in vivo in chick embryo CAM model.
- A CAMs were exposed to either vehicle (PBS) or human parstatin (1-41) (1-10nmoles, parst 1 , parst 10) or bFGF (100nmoles) or VEGF (lOOnmoles) or the indicated combinations for 48 h. Representative photomicrographs are shown.
- FIGURE 2 Parstatin (1-41) inhibits angiogenesis in ex-v/Vo rat aortic ring model.
- A Collagen embedded freshly cut rat aortic rings were incubated in either basal medium or in medium supplemented with VEGF (10ng/ml) or bFGF (25ng/ml) for 7 days. Cultures were treated with vehicle alone or with human parstatin (1-41) at concentrations ranging from 1 to 10 ⁇ (parst 1 , parst 3, parst 10). Representative photomicrographs are shown.
- FIGURE 3 Parstatin (1-41) inhibits angiogenesis-related in vitro models.
- HUVECs were plated onto Matrigel layers with medium containing 5% FBS in the absence or in the presence of indicated concentrations of parstatin (1-41) or mouse parstatin (mouse, 10 ⁇ ) or parstatin (24-41) (24-41 , 10 ⁇ ) or scrambled parstatin (scr, 10 ⁇ ).
- Capillary-like networks were quantitated after 18 h.
- HUVECs were cultured between two fibrin layers in medium containing VEGF/ bFGF, (25ng/ml each) in the absence or in the presence of indicated concentrations of parstatin (1-41) or mouse parstatin (mouse, 10 ⁇ ) or parstatin (24-41) (24-41 , 10 ⁇ ) or scrambled parstatin (scr, 10 ⁇ ).
- parstatin 1-41
- mouse parstatin mouse parstatin
- parstatin 24-41)
- scr scrambled parstatin
- HUVECs were allowed to migrate for 6 h toward 5% FBS in the absence (control) or in the presence of indicated concentrations of parstatin (1-41) or mouse parstatin (mouse, 10 ⁇ ) or parstatin (24-41) (24-41, 10 ⁇ ) or scrambled parstatin (scr, 10 ⁇ ).
- Tube formation (A, B) was quantitated in triplicates using a computerized digital image analyzer. Eachexperiment was repeated at least three times. Results are given as mean percentage change of control (100%) ⁇ SE.
- Statistical analysis was performed versus controls.
- Cell migration experiments (C) were run in triplicate and repeated at least three times. The results are expressed as mean number of migrated cells per six high- magnification microscopic fields ⁇ SE.
- Statistical analysis was performed versus controls. *p ⁇ 0.05, **p ⁇ 0.01.
- FIGURE 4 Parstatin (1-41) inhibits growth of endothelial cells. HUVECs were incubated in medium containing 5% FBS in the absence (control) or in the presence of human parstatin (1-41) at concentrations ranging from 1 to 10 ⁇ . Estimation of cell growth (proliferation) was performed after 24, 48, or 72 h. Experiments were run in triplicate and repeated at least three times. Results are expressed as mean of optical densities at 450nm (OD 450 ) ⁇ SE. Statistical analysis was performed versus controls. *p ⁇ 0.05, ** p ⁇ 0.01. FIGURE 5. Parstatin (1 ⁇ 1) inhibits DNA synthesis in endothelial cells.
- HUVECs were incubated in medium containing either 0.5% BSA or 5% FBS or VEGF (10ng/ml) or bFGF (5ng/ml) in the absence (control) or in the presence of increasing concentrations of human parstatin (1-41) for 18 h.
- B HUVECs were incubated in medium containing either 0.5% BSA (C, control) or bFGF (5ng/ml) or EGF (10ng/ml) or HB-EGF (HB, 50ng/ml) in the absence or in the presence of human parstatin (1-41) (10 ⁇ ) for 18 h. All cells were pulsed with [ 3 H]thymidine for an additional 6 h.
- FIGURE 6 Parstatin (1-41) inhibits signaling through the MAP kinase pathway.
- A Serum-starved HUVECs were pretreated with parstatin (1-41) (10 ⁇ ) for 1 h and then stimulated with 5% FBS or bFGF (5ng/ml) or VEGF (10ng/ml) for 10 min.
- B HUVECs were pretreated with indicated concentrations of parstatin (1-41) for 1 h and then stimulated with bFGF (5ng/ml) for 10 min.
- HUVECs were pretreated with parstatin (1-41) (10 ⁇ ) for indicated time periods or with scramble parstatin (Scr, 10 ⁇ ) or mouse parstatin (mouse, 10 ⁇ ) for 1 h and then stimulated with bFGF (5ng/ml) for 10 min.
- D HUVECs were pretreated with parstatin (1-41) (10 ⁇ ) for 1 h and then stimulated with bFGF (5ng/ml) or washed (removal of parstatin (1-41)) and incubated in fresh medium for addition indicated times and stimulated with bFGF.
- HUVECs Serum- starved HUVECs were pretreated with parstatin (1-41) (10 ⁇ ) for 1 h and then stimulated with bFGF (5ng/ml) or EGF (10ng/ml) or HB-EGF (50ng/ml) for 10 min. Cell lysates were probed with antiphospho Erk1/2-specific antibody. To determine total protein level, membranes were probed with Erk1/2 antibody. Experiments were repeated at least three times. Representative membrane blots are shown.
- FIGURE 7 Parstatin (1-41) promotes endothelial cell apoptosis.
- HUVECs were incubated in medium containing either 0.5% BSA or bFGF (5ng/ml) in the absence or in the presence of human parstatin (1-41) (10 ⁇ ) for 24 h.
- Harvested cells were stained with propidium iodide and analyzed with a flow cytometer. Results are expressed as the mean percentage of cell population in sub-Go/G1 , G1 , S, and G2/M phases of the cell cycle + SE. Experiments were run in duplicate and repeated three times. Statistical analysis was performed between indicated groups. *p ⁇ 0.05, **p ⁇ 0.01.
- HUVECs were incubated in medium containing either 0.5% BSA or VEGF (10ng/ml) or bFGF (5ng/ml) in the presence of vehicle or human parstatin (1-41) (10 ⁇ ) for 24 h.
- C HUVECs were incubated in medium containing 0.5% BSA in the presence- of vehicle (C) or indicated concentrations of human parstatin (1-41) or caspase inhibitor Z-VAD-FMK (100 ⁇ ) or the indicated combination for 24 h.
- FIGURE 8 Parstatin activates caspase-3 activity in endothelial cells.
- A, B Caspase-3 activity was determined in cell extracts of HUVECs cultured in medium containing either 0.5% BSA in the presence of vehicle or indicated concentrations of human parstatin (1-41) or bFGF (5ng/ml) or Z-VAD-FMK (Z-VAD, 100 ⁇ ) or mouse parstatin (mouse, 10 ⁇ ) or scrambled parstatin (scr, 10 ⁇ ) or the indicated combination for 24 h. Results are expressed as mean of optical density at 405 nm (OD 05 ) ⁇ SE. Experiments were run in triplicate and repeated three times. Statistical analysis was performed versus controls or between indicated groups.
- HUVECs were cultured in medium containing either 0.5% BSA or bFGF (5ng/ml) in the presence of vehicle or indicated concentrations of human parstatin (1-41) for 24 h. Protein lysates were immunoblotted with anti-PARP monoclonal antibody. Total protein levels were determined by probing membranes with ct-tubulin antibody. Representative membrane blot is presented.
- FIGURE 9 Parstatin is a cell-penetrating peptide.
- A Representative histograms showing the effect of parstatin peptides on cellular uptake. HUVECs were incubated with indicated concentrations of FITC-labeled parstatin (1-41) or FITC-labeled parstatin (24-41) or FITC-labeled modulated parstatin for 30 min. Trypsinized cells were analyzed by flow cytometry. The uptake of FITC-labeled parstatin peptides into cells was assessed by the change of the FITC-positive cell population compared with untreated control cell samples. Experiments were run in duplicate and repeated three times.
- B Representative histograms showing the cellular uptake of parstatin (1-41) by the time. HUVECs were incubated with FITC-labeled parstatin (1-41) (10 ⁇ ) for the indicated time intervals. Cells were analyzed by flow cytometry. Experiments were run in duplicate and repeated three times.
- C Fluorescence microscopy images. HUVECs were incubated with 10mM of FITC-labeled (green) parstatin. (1-41) or modulated parstatin or parstatin (24-41) for the indicated time intervals. All cells were also, stained with the nuclear dye DAPI (blue). Arrows show the FITC-signal localization on cell membrane or in cytosol. Experiments were run in triplicate and repeated three times.
- Modulated parstatin mimics parstatin (1-41) in inhibition of MAPK activation and DNA synthesis in endothelial cells.
- MAPK activation left panel
- HUVECs were pretreated with parstatin (1-41) (10 ⁇ ) or parstatin (24-41) (10 ⁇ ) or modulated parstatin (10 ⁇ ) for 1 h and then stimulated with bFGF (5ng/ml) for 10 min. Cells were then processed as described in figure 6. Representative blots are shown.
- HUVECs were incubated in serum-free medium supplemented with bFGF (5ng/ml) in the absence or in the presence of parstatin (1-41) (10 ⁇ ) or parstatin (24-41) (10 ⁇ ) or modulated parstatin (10 ⁇ ) for 18 h. All cells were pulsed with [ 3 H]thymidine for an additional 6 h. All experiments were run in triplicate and were repeated at least three times. Results are expressed as mean ⁇ ⁇ SE of DPM per well and presented as percentage change of control (0%). Statistical analysis was performed between indicated groups. ** p ⁇ 0.01. FIGURE 10. Parstatin (1-41) suppresses choroidal neovascularization (CNV) in mice.
- CNV choroidal neovascularization
- mice were perfused with FITC-labeled dextran and choroidal flat mounts were prepared and examined by fluorescence microscopy. Compared to control eyes, those injected with parstatin (1-41) or parstatin (1-26) or (24-41) fragments showed significant smaller areas of CNV. The area of CNV at each rupture site was measured by image analysis. Results are expressed as mean areas (mm 2 ) of Choroidal NV ⁇ SE for each group calculated from indicated number (n) of eyes. Statistical analysis was performed versus control group.
- Parstatin (1-41) suppresses retinal neovascularization in mice. Newborn mice were. placed in 75% oxygen at postnatal day 7. At P12 they were returned to room air. Intravitreal injections of indicated doses of parstatin (1-41), vehicle (control) or scrambled parstatin (10pg) were administrated on P12 and P15. At P17, mice were treated with griffonia simplificolia isolectin B4-589. Compared to control retinas (A, E), those treated with 0.5ug (B, F) or 3pg (C, G) of parstatin (1-41) showed proportionally less areas of retinal neovascularization.
- Retinal neovascularization in retinas treated with scrambled parstatin (D, H) was similar to that observed in control mice.
- E, F, G and H are higher magnification images of the boxes in A, B, C and D, respectively. Scale bar: 200um.
- I Total area of neovascularization (NV) at each retina site was measured by image analysis. Results are expressed as mean areas (mm 2 ) of retinal neovascularization ⁇ SE for each group calculated from indicated number (n) of eyes. Statistical analysis was performed versus control group. * p ⁇ 0.05, ** p ⁇ 0.01.
- FIGURE 13 Parstatin (1-26) and (24-41) fragments suppress retinal neovascularization in mice. Newborn mice were placed in 75% oxygen at postnatal day 7. At P12 they were returned to room air. A, Intravitreal injections of vehicle (control, DMSO) or parstatin (1-26) (5pg) were administrated on P12 and P15. B, Intravitreal injections of vehicle (control, PBS) or parstatin (1-41) (5 g) or parstatin (24- 41) (5 g) were administrated on P12 and P15. At P17, mice were treated with griffonia simplificolia isolectin B4-589.
- NV retinal neovascularization
- FIGURE 14 Parstatin (1-41) suppresses corneal neovascularization in rats.
- Chemical burn-induced corneal trauma was performed by the application of 75% silver nitrate and 25% potassium nitrate to the centre of rat corneas.
- Two subconjunctival injections per eye of indicated doses of parstatin (1-41) or vehicle (control) or scrambled parstatin (scrambled, 2x100pg) were administrated immediately after cauterization. Corneal neovascularization was assessed 7 days after cauterization.
- those treated with 2x100pg (B) of parstatin (1-41) showed proportionally reduced areas of corneal neovascularization.
- NV neovascularization
- Corneal neovascularization in eyes- treated with scrambled parstatin (C) was similar to that observed in control mice. Results are expressed as the mean percentage of area covered by vessels to the total corneal area ⁇ SE for each group calculated from the indicated number (n) of eyes. Statistical analysis was performed versus control group. * * p ⁇ 0.01.
- A Two subconjunctival injections per eye of indicated doses of parstatin (1- 26) or vehicle (control, D SO) were administrated immediately after cauterization.
- B Two subconjunctival injections per eye of indicated doses of parstatin (24-41) or vehicle (control, PBS) or parstatin (1-41) (2x100pg) were administrated immediately after cauterization.
- Corneal neovascularization was assessed 7 days after cauterization. Compared to control corneas those treated with 2x50pg of parstatin (1- 26) or (24-41) fragments showed proportionally reduced areas of corneal neovascularization.
- Total area of neovascularization (NV) in each cornea was measured by image analysis. Results are expressed as the mean percentage of area covered by vessels to the total corneal area ⁇ SE for each group calculated from the indicated number (n) of eyes. Statistical analysis was performed versus control group. **p ⁇ 0.01.
- FIGURE 16 Corneal histopathology. Rats were treated as described in figure 14 and 15. Seven- days after cauterization, eyes, were excised, embedded in paraffin and sectioned. Sections were stained with hematoxylin-eosin and vascular vessels (A, B, and E) or neutrophils (C, D, and F) in the corneas were counted at magnification X200 or X400, respectively. Compared to control corneas (A, C), those treated with 2x100pg (B, D) of parstatin (1-41) showed much fewer blood vessels or infiltrating neutrophils. The blood vessels or neutrophils' density in corneas treated with scrambled parstatin were similar to those observed in control rats.
- FIGURE 17 Parstatin (1-41) and parstatin (1-26) and (24-41) fragments reduce VEGF-induced retinal leukostasis in mice.
- Intravitreal injections of vehicle (control), or VEGF (10 ⁇ ), or parstatin (1-41), or parstatin (1-26) or parstatin (24-41) or the indicated combination of VEGF with parstatin peptides were administrated to assess their effect on retinal leukostasis. After 6 h, mice were perfused with FITC-conjugated concavalin A. Retinal flat mounts were prepared and the total numbers of leukocytes adhering to the retinal vessels (arrows) were counted at magnification X200.
- FIGURE 18 Parstatin (1-41) attenuates myocardial ischemia-reperfusion injury in rats. Analysis of the cardioprotective effects of parstatin.
- A Dose-response curve of parstatin (1-41). Rats were treated with either saline or increasing-concentrations of human parstatin (1-41) administered as an intravascular bolus 15 min prior to ischemia. Infarct size was determined after 30 min regional ischemia and 120 min reperfusion.
- FIGURE 20 The cardioprotective effects of parstatin (1-41 ) are dependent on Gi- protein signaling pathways. Inhibition of Gi-protein activation by pertussis toxin (PTX) completely abolished the cardioprotective effects of parstatin (1-41). PTX was injected 48 hours prior to ischemia. Isolated hearts were perfused with or without parstatin (1- 41 ) (1 ⁇ ) and subject to 30 min ischemia and 180 min reperfusion. A, Infarct size. B, Recovery of left ventricular developed pressure (LVDP). Inhibition of p38 MAPK or Erk1/2 negates the cardioprotective effects of parstatin (1 -41).
- LVDP left ventricular developed pressure
- Isolated hearts were perfused with SB204580 (1 ⁇ ) or PD98059 (10 ⁇ ) with or without parstatin (1 -41) (1 ⁇ ).
- C Infarct size.
- FIGURE 22 Coronary response to parstatin (1-41 ) during ischemia and reperfusion.
- A Parstatin (1-41) increases coronary flow during ischemia and reperfusion. Administration of parstatin (1-41) (1 ⁇ ) 15 min prior to ischemia and reperfusion resulted in an increase in coronary flow when compared with control values.
- B Parstatin (1-41) decreases perfusion pressure in isolated rat hearts during ischemia and reperfusion. Isolated rat hearts were perfused with or without parstatin (1-41) (1. ⁇ ) for 15 min prior to regional ischemia and reperfusion. Perfusion pressure was monitored throughout the procedure. Average pressures from pre-ischemia, ischemia, and post-ischemia were compared.
- FIGURE 23 Parstatin (1-26) fragment attenuates myocardial ischemia-reperfusion injury in rats. Analysis of the cardioprotective effects of parstatin(1-26) in vivo.
- A Dose-response curve of parstatin (1-26). Rats were treated with either vehicle (DMSO), or parstatin (1-41) (10 pg/kg), or parstatin (1-26) (0.01-10 pg/kg) administered as an intravenous bolus 15 min before ischemia. Infarct size was determined after 30 min of regional ischemia and 120 min of reperfusion.
- FIGURE 24 The cardioprotective effects of parstatin (1-26) depend on Gi proteins and PI3K Akt activation. Inhibition of Gi protein activation by pertussis toxin (PTX) completely abolished the cardioprotective effects of parstatin (1-26).
- PTX was njected 48 h before ischemia. The rats were treated with parstatin (1-26) (1 pg/kg) and subjected to 30 min of ischemia and 120 min of reperfusion.
- A Infarct size expressed as a percentage of area at risk. Inhibition of PI3K/Akt with wortmannin (15 pg/kg) negates the cardioprotective effects of parstatin (1-26) (1 pg/kg).
- Parstatin (1-26) increased activation of Akt after 5 min of reperfusion as measured by phosphorylation of Akt.
- C Immunoblot for phosphorylated Akt.
- FIGURE 25 The cardioprotective effects of parstatin (1-26) depend on NOS activation and nitric oxide production. Inhibition of NOS with L-NMA (15 mg/kg) negates the cardioprotective effects of parstatin (1-26) (1 pg/kg).
- n 3/group; *p ⁇ 0.05, versus drug-free control.
- A Infarct size expressed as a percentage of area at risk. Pre-ischemic treatment with parstatin (1-26) (1 pg/kg) increases the myocardial cGMP content.
- FIGURE 27 The cardioprotective effects of parstatin (1-26) depend on K AT P channels and mPTP. Inhibition of K A TP channel activation with glibenclamide (3 mg/kg), HMR
- Parstatin (1-41) protects from acute renal injury in a rat model of ischemia and reperfusion-induced nephropathy. Wistar rats were subjected to 45 min of renal ischemia followed by 4 hours of reperfusion. Parstatin (1-41), at doses ranging from 3 to 100 pg/Kg, was administered intravenously 15 min prior to ischemia (renal l-R) or 10 seconds after the onset of reperfusion (Renal l-R After). Scrambled parstatin (30 pg/Kg) was administrated intravenously 15 min prior to ischemia.
- Control rats were treated with vehicle only (PBS), while sham rats did not undergo ischemia and reperfusion. At the end of reperfusion, the ischemia-reperfusion injury was assessed by analyzing biochemical markers of renal impairment and histologically. Serum creatinine (A), franctional excretion of Na+ (B), and histological score (C) were estimated. Results are expressed as mean ⁇ SE for each group calculated from the indicated number (n) of rats. *p ⁇ 0.05, **p ⁇ 0.01.
- FIGURE 29 Parstatin (1-26) protects from acute renal injury in a rat model of ischemia and reperfusion-induced-nephropathy.
- Wistar rats were subjected to 45 min of renal- ischemia followed by 4 hours of reperfusion.
- Parstatin (1-26) at doses ranging from 1 to 100 pg/Kg, was administered intravenously 15 min prior to ischemia (renal l-R) or 10 seconds after the onset of reperfusion (Renal l-R After).
- Control rats were treated with vehicle only (DMSO), while sham rats did not undergo ischemia and reperfusion.
- the ischemia-reperfusion injury was assessed by analyzing biochemical markers of renal impairment and histologically.
- the invention includes a class of bioactive peptide molecules that have the ability to modulate cell functions and physiological and pathological processes. These peptides are collectively referred to as parstatin peptides.
- the invention further includes various therapeutic uses of said parstatin peptides.
- the invention encompasses the following embodiments which may be read separately or in combination with one or more other embodiments.
- the preferred features described below apply mutatis mutandis to all aspects of the invention. Specifically, the therapeutic applications described below apply to each of the various parstatin peptides disclosed herein.
- a first aspect of the invention relates to an isolated peptide comprising a sequence selected from SEQ ID NO:1 (1-41), SEQ ID NO:9 (1-26) and SEQ ID NO:4 (24-41), or a variant, derivative, fragment or homologue thereof.
- isolated means that the peptide is at least substantially free from at least one other component with which the sequence- is naturally associated in nature and as found- in nature. In one aspect, preferably- the substance is in a purified form.
- purified or “substantially purified” or “substantially isolated” mean that a substance is in a relatively pure state - least 60% free, preferably 75% free, preferably 90% free, preferably 95% free and more preferably 99% free from other components with which it is naturally associated.
- the invention relates to an isolated peptide consisting of a sequence selected from SEQ ID NO:1 (1-41), SEQ ID NO:9 (1-26) and SEQ ID NO:4 (24-41), or a variant derivative, fragment or homologue thereof.
- the peptides of the invention comprise at least an active portion of the peptides of SEQ ID NOS: 1-3 including the full-length peptide or substantially homologous polypeptides thereto.
- the peptide of the invention comprises amino acids 1-41 of SEQ ID NO:1 , or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention consists of amino acids 1-41 of SEQ ID NO:1 , or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention comprises amino acids 1-26 of SEQ ID NO:1 , or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention consists of amino acids of SEQ ID NO:9, or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention comprises amino acids 24-41 of SEQ ID NO:1, or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention consists of amino acids of SEQ ID NO:4, or is a variant, derivative, fragment or homologue thereof.
- the peptide of the invention may be an isolated polypeptide and/or may be a non- naturally occurring polypeptide.
- the peptide may be a human peptide or a peptide originating from another species.
- parstatin refers to a peptide comprising at least an active portion of the peptide of cleaved peptide of human PARI (Genbank Accession Number AF019616) with the sequence: MGPRRLLLVAA-CFSLCGPLLSARTRARRPESKATNATLDPR (SEQ ID NO: 1) including the full-length peptide of SEQ ID NO:1 or a substantially homologous polypeptide thereto.
- the parstatin peptides described herein may also be referred to as the bioactive molecules of the invention.
- the peptide of the invention is at least 41 amino acids in length. Preferably, the peptide is around 41 amino acids or greater in length.
- the peptide of the invention is from 26 to 35 amino acids in length. In another preferred embodiment, the peptide of the invention is from 26 to 30 amino acids in length.
- the peptide is about 41 amino acids and approximately 4.5 kDa in size.
- Such peptides are naturally generated by cleavage of the N-terminal domain of the protease activated receptor-1 (PARI). Cleavage and release of the N-terminal domain results in the generation of a new N-terminus on the receptor, activating the receptor.
- Full length Parstatin is predicted to be less than 41 residues in length because of an initial hydrophobic domain of approximately 21 to 23 amino acids ( GPRRLLLVAACFSLCGPLLSAR (amino acids 1-23 of SEQ ID NO: 1) that may represent a putative signal sequence.
- PARI belongs to the small subgroup of G protein-coupled receptors (5-10%) possessing N-terminal signal peptides. Signal peptides have been shown to facilitate export of many secretory proteins across eukaryotic endoplasmic reticulum and are believed to be cleaved-off after mediating the endoplasmatic reticulum targeting/insertion process. However, this may not always be the case. Interestingly, parstatin contains an asparagine-linked (Asn35) glycosylation site, which may prevent proteolysis of signal sequence.
- amino acid sequence is synonymous with the term “polypeptide” and/or the term “protein” and/or the term “peptide” and/or the term “polypeptide sequence” and/or the term “peptide sequence” and/or the term “protein sequence”.
- parstatin polypeptides of the invention may be prepared and/or isolated from a suitable source, or may be made synthetically or may be prepared by use of recombinant DNA techniques.
- the terms apply to amino acid polymers in which one or more amino acid residue is an artificial chemical mimetic of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers and non-naturally occurring amino acid polymer.
- the parstatin peptides of the invention are potent inhibitors of angiogenesis, endothelial cell growth, migration, and differentiation. As further demonstrated herein, the parstatin peptides of the invention promote endothelial cell apoptosis and block the angiogenesis process. In addition, the parstatin peptides of the invention have been demonstrated to be effective in the prevention and treatment of myocardial ischemia/reperfusion injury and of acute renal failure and associated disease states. Moreover, the parstatin peptides of the invention are demonstrated to work cross species with mouse parstatin having an effect on human cells and tissues, and both mouse and human parstatin having an effect on rat cells and tissue.
- the present invention also encompasses variants and derivatives and homologues of the parstatin peptides that are active in vitro and/or in vivo.
- the present invention therefore includes a 41 amino acid parstatin peptide (full length SEQ ID NO: 1), derivatives and variants of the parstatin peptide, and biologically-active fragments of the parstatin peptide, including truncations of the N— and/or C-terminus of SEQ ID NO: 1, and/or internal deletions.
- the term "variant” is used ⁇ to include the peptides of SEQJD Nos 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 t»eing modified by at least one of; deletion, addition or substitution of one or more amino acid residues, or by substitution of one or more natural amino acid residues by the corresponding D-stereomer or by a non-natural amino acid residue, chemical derivatives of the peptides, cyclic peptides derived from the peptides or from the peptide derivatives, dual peptides, multimers of the peptides and any of said peptides in the D-stereisomer form or the order of the final two residues at the C-terminus residues are reversed; provided that such variants retain the activity of the parent peptide.
- substitution is used as to mean "replacement” i.e. substitution of an amino acid residue means its replacement.
- the term "derivative” refers to a peptide arising from the modification of the peptides of the invention, wherein the peptides of the invention serve as the starting point.
- a longer polypeptide incorporating the peptide of the invention may be a derivative, as may a peptide of the invention which incorporates the addition of further chemical groups.
- fragment refers to a portion of the parstatin peptides of the invention or their variants or derivatives. A fragment typically lacks one or more amino acids compared to the full length peptides of the invention.
- parstatin peptides or “parstatin polypeptides” includes longer peptides with N- and/or C-terminal extensions or insertions in the 4.5 kDa peptide of SEQ ID NO: 1 , and modified peptides and proteins that have a substantially similar amino acid sequence, and which have the ability to modulate endothelial cell functions and physiological and pathological processes.
- parstatin peptides or “parstatin polypeptides” also includes shorter peptides with one or more amino acids is removed from either or both N— and C-terminal or from internal regions in the 4.5 kDa peptide of SEQ ID NO: 1 and modified peptides that have a substantially similar amino acid sequence, and which have the ability to modulate endothelial cell functions and physiological and pathological processes.
- substitutions of amino acids wherein the replacement of an amino acid with a structurally or chemically similar amino acid does not significantly alter the structure, conformation or activity of the peptide (i.e., a conservative substitution), is well known in the art.
- mouse parstatin has an effect on both human and rat cells and tissues.
- Human parstatin has an effect on rat cells and tissues.
- Sequence alignments demonstrate that human and mouse parstatin (N-terminus of Accession No. AAB38308.1) are 63% identical and 80% similar over the 41 amino acid length of the peptide sequences.
- the N-terminal 41 amino acids of the thrombin receptor of Cricetulus longicaudatus (long-tailed dwarf hamster, Accession No.
- CAA43957.1 are 68% identical and 85% similar to human parstatin.
- the N-terminal 41 amino acids of rat thrombin receptor (Accession No. P26824) are 67% identical and 75% similar to human parstatin over amino acids 1-37.
- the N-terminal 41 amino acids of the thrombin receptor of Bos Taurus (cow, Accession No. A7YY44) are 63% identical and 68% similar over the first 41 amino acids.
- the N-terminal 41 amino acids of the thrombin receptor of Macaca mulatta rhesus monkey, Accession No. XP.sub.-001106136
- human MGPRRLLLVAACFSLCGPLLSARTRARRPESKATNATLDPR 41 1 monkey MGPRRLLLVAACLCLCGPLLSARTRARRPASKATNATLDPR 41 5 mouse MGPRRLLIVALGLSLCGPLLSSRVPMSQPESERTDATVNPR 41 4 rat MGPRRLLLVAVGLSLCGPLLSSRVPMRQPESERMYATPYAT 41 6 hamster MGPQRLLLVAAGLSLCGPLLSSRVPVRQPESEMTDATVNPR 41 3 bovine MGPRWLLLWAAGLGLCSPLVSARTRGPRPGTDPTNGTLGPR 41 7
- mutation of amino acids conserved across all species which are indicated with an * would likely be more disruptive to function than mutations at amino acids that are not conserved across species.
- Mutations at non-conserved amino acids e.g., amino acids 5, 9, 11-12, 14, 17, 20, 22, 24, 25-27, 30, 33-35, 38-39, and 41 ) would likely be more well tolerated.
- the peptides of the inventions may also have deletions, insertions or substitutions of amino acid residues which produce a silent change and result in a functionally equivalent substance.
- Deliberate amino acid substitutions may be made on the basis of similarity in amino acid properties (such as polarity, charge, solubility, hydrophobicity, hydrophilicity, and/or the amphipathic nature of the-residues) and it is therefore useful to group amino acids together in functional groups.
- Amino acids can be grouped together based on the properties of their side chain alone. However it is more useful to include mutation data as well.
- the sets of amino acids thus derived are likely to be conserved for structural reasons. These sets can be described in the form of a Venn diagram (Livingstone CD.
- the invention further encompasses parstatin peptides comprising homologous substitution (substitution and replacement are both used herein to mean the interchange of an existing amino acid residue, with an alternative residue) that may occur i.e. like-for-like substitution such as basic for basic, acidic for acidic, polar for polar etc. Non-homologous substitution may also occur i.e.
- Z ornithine
- B diaminobutyric acid
- O norleucine ornithine
- pyriylalanine thienylalanine
- naphthylalanine phenylglycine
- Parstatin peptides having mutations or alterations that do not eliminate parstatin peptide function are also included within the scope of the invention. Such mutations or alterations can alter properties of the peptide such as bioavailability or allow for modification of the peptide with various groups. Groups may be to allow for detection of parstatin peptides (e.g., radioactive or fluorescent label) or to change or augment the activity of the peptide (e.g., a chemotherapeutic agent). Such substitutions fall within the scope of the invention. These include peptides with parstatin activity that have amino acid substitutions or have sugars or other molecules attached to amino acid functional groups.
- parstatin peptides have activity across species demonstrating that sequence variation is tolerable and does not completely disrupt activity of parstatin peptides.
- sites of variation between species can provide an indication of sites that can be altered while retaining function.
- the parstatin peptides have at least 30%, 40%, 50%, 60%, 70%, 80%, 85%, 90%, or 95% activity as compared to the peptide of SEQ ID NO: 1 in at least one of the assays taught herein.
- Such assays are routine in the art.
- the assay is an angiogenesis assay.
- the assay is a cell proliferation assay.
- the assay is a cell mitogenesis assay.
- the assay is a cell migration assay.
- the assay is a cell differentiation assay.
- the assay is an apoptosis assay.
- the assay is a cell cycle progression assay.
- the assay is a kinase activation assay.
- the assay is an ischemia/reperfusion assay.
- the peptide includes 5 or more, 10 or more, 11 or more, 12 or more, 13 or more, 14 or more, 15 or more, 16 or more, 17 or more, 18 or more, 19 or more, 20 or more, 21 or more, 22 or more, 23 or more, 24 or more, 25 or more, 26 or more,. -2-7 or more, 28 or more, 29 " or more, 30 or more, 31 ⁇ or more, 32-or more, 33ror more, 34 or more, 35 " or more, 6 or more, 37 or more, 38 or more, 39 or more, 40-or more, or 41 consecutive amino acids of SEQ ID NO: 1.
- the peptide is an 18 amino acid fragment of SEQ ID NO: 1 including amino acids 24-41 of SEQ ID NO: 1 (SEQ ID NO:4).
- the peptide is a 26 amino acid fragment of SEQ ID NO 1 including amino acids 1-26 of SEQ ID NO: 1 (SEQ ID NO:9).
- the peptide includes a parstatin peptide sequence, covalently linked, e.g., through a peptide bond, to a non-parstatin peptide sequence.
- a parstatin peptide sequence covalently linked, e.g., through a peptide bond, to a non-parstatin peptide sequence.
- the term “homologue” means an entity having a certain homology with the amino acid sequences of the invention and/or the nucleotide sequences of the invention.
- the term “homology” can be equated with "identity”.
- a homologous sequence is taken to include an amino acid sequence which may be at least 60, 65, 70, 75, 80, 85 or 90% identical, preferably at least 95, 96, 97, 98 or 99% identical to the subject sequence.
- Substantial sequence homology or “substantially homologous” means at least about 60% homology, at least about 70% homology, at least about 80% homology, at least about 90% homology, at least about 95% homology, preferably at least about 99% homology between the amino acid sequence compared to the reference sequence.
- “Substantial sequence identity” or “substantially identical” means at least about 60% identity, at least about 70% identity, at least about 80% identity, at least about 90% identity, at least about 95% identity, preferably at least about 99% identity to the reference sequence.
- the words “homology” and “identity” are used interchangeably.
- Homology comparisons can be conducted by eye, or more usually, with the aid of readily available sequence comparison programs. These commercially available computer programs can calculate percentage homology (% homology) between two or more sequences. Percentage homology may be calculated over contiguous sequences, i.e. one sequence is aligned with the other sequence and each amino acid in one sequence is directly compared with the corresponding amino acid in the other sequence, one residue at a time. This is called an "ungapped" alignment. Typically, such ungapped alignments are performed only over a relatively short number of residues.
- GCG Bestfit program A new tool, called BLAST 2 Sequences is also available for comparing protein and nucleotide sequence (see FEMS Microbiol Lett 1999 174(2): 247-50; FEMS Microbiol Lett 1999 177(1): 187-8 and tatiana@ncbi.nlm.nih.gov).
- BLAST 2 Sequences is also available for comparing protein and nucleotide sequence (see FEMS Microbiol Lett 1999 174(2): 247-50; FEMS Microbiol Lett 1999 177(1): 187-8 and tatiana@ncbi.nlm.nih.gov).
- a scaled similarity score matrix is generally used that assigns scores to each pairwise comparison based on chemical similarity or evolutionary distance.
- BLOSUM62 the default matrix for the BLAST suite of programs.
- GCG Wisconsin programs generally use either the public default values or a custom symbol comparison table if supplied (see user manual for further details). For some applications, it is preferred to use the public default values for the GCG package, or in the case of other software, the default matrix, such as BLOSUM62.
- percentage homologies may be calculated using the multiple alignment feature in DNASISTM (Hitachi Software), based on an algorithm, analogous to CLUSTAL (Higgins DG & Sharp PM (1988), Gene 73(1), 237-244).
- % homology preferably % sequence identity.
- the software typically does this as part of the sequence comparison and generates a numerical result.
- the invention further encompasses compositions in which the parstatin sequence contains a-peptidomimetic.
- the invention includes parstatin compounds in which one or more peptide bonds have been replaced with an alternative type of covalent bond, which is not susceptible to cleavage by peptidases (a "peptide mimetic" or "peptidomimetic”).
- a peptide mimetic or "peptidomimetic”
- replacement of a particularly sensitive peptide bond with a non- cleavable peptide mimetic renders the resulting peptide more stable and thus more useful as a therapeutic.
- Such mimetics, and methods of incorporating them into peptides are well known in the art.
- the replacement of an L-amino acid residue e.g., with a D-amino acid
- the peptides of the invention can be synthesized as retro-inverso isomers, which include peptides of reverse sequence and chirality (Jameson et al., Nature, 368: 744.746, 1994; Brady et al., Nature, 368: 692-693, 1994).
- the net result of combining D- enantiomers and reverse synthesis is that the positions of carbonyl and amino groups in each amide bond are exchanged, while the position of the side-chain groups at each alpha carbon is preserved.
- the peptide model is a peptide formed of L- amino acids having the sequence ABC
- the retro-inverso peptide analog formed of D- amino acids would have the sequence CBA.
- the procedures for synthesizing a chain of D-amino acids to form the retro-inverso peptides are known in the art.
- Another aspect of the invention relates to conjugates comprising peptides of the invention.
- the invention includes compositions in which the parstatin peptide or a part of it is conjugated with a "cell-penetrating moiety" or "membrane-tethering moiety".
- Cell- penetrating moiety is a compound which mediates transfer of a substance from an extracellular space to an intracellular compartment of a cell.
- Cell-penetrating moieties shuttle a linked substance (e.g., parstatin peptides, fragments, and analogs) into the cytoplasm or to the cytoplasmic space of the cell membrane.
- Membrane-tethering moiety is a compound which associates with or binds to a cell membrane.
- the membrane- tethering moiety brings the substance (e.g., parstatin peptides, fragments, and analogs) to which the membrane-tethering moiety is attached in close proximity to the membrane of a target cell.
- a cell penetrating or membrane-tethering moiety is a hydrophobic moiety.
- Cell-penetrating and membrane-tethering moieties include a lipid, cholesterol, phospholipids, steroid, sphingosine, ceramide, or a fatty acid moiety.
- the cell-penetrating or membrane-tethering moiety is attached to the C-terminal amino acid, the N-terminal amino acid, or to an amino acid between the N-terminai and C-terminal amino acid of the parstatin or parstatin fragment.
- the invention also includes compositions in which the parstatin peptides, fragments, and analogues are conjugated with sugar molecules.
- Glycosylation is a universal characteristic of proteins in nature, which determines their physicochemical and biological properties. Design and synthesis of glycopeptides is a topic of intense research in the last years, since the carbohydrate modification can improve the pharmacokinetic characteristics, or otherwise enhance or alter the biologic activity and can be used as a tool to study the biologic functions.
- parstatin peptides of the present invention can be made by automated peptide synthesis methodologies well known to one skilled in the art.
- parstatin, of the present invention may be isolated from larger proteins, such as human PARI , rat PARI , mouse PARI , and primate PARI proteins that share a common or similar N-terminal amino acid sequence.
- the parstatin peptides of the invention can be produced upon the proteolysis of PARI by proteases such as thrombin, plasmin, activated protein C, metalloprotease-1. Parstatin peptides can also be produced from recombinant sources, from genetically altered cells implanted into animals, and from platelets and cell cultures as well as other sources.
- parstatin is made in cells of the nervous system and tumors. Parstatin can be isolated from body fluids including, but not limited to, serum, urine, and ascites, or synthesized by chemical or biological methods (e.g. cell culture, recombinant gene expression, peptide synthesis, and in vitro enzymatic catalysis of precursor molecules to yield active parstatin). Recombinant techniques include gene amplification from DNA sources using the polymerase chain reaction (PCR), and gene amplification from RNA sources using reverse transcriptase/PCR. The specific method of making the parstatin peptides of the invention is not a limitation of any of the compositions or methods of the invention.
- parstatin peptides can be of animal, particularly mammalian, for example of human in origin. Parstatin peptides can also be produced synthetically by chemical reaction or by recombinant techniques in conjunction with expression systems. Parstatin peptides can also be produced by enzymatically cleaving different molecules, including parstatin precursors or-peptides, containing sequence homology or identity with segments of parstatin to generate peptides having cell activity.
- One aspect of the invention relates to an isolated peptide as described above for use as a medicament.
- treating, preventing or alleviating refers to the prophylactic or therapeutic use of the therapeutic agents described herein.
- prevention refers to a reduction in the chance that a subject will suffer from a particular disease or condition.
- the chance of a subject suffering from a particular disease or condition can be determined by a trained individual, such as a physician. For example, a subject suffering from cardiac ischemia of sufficient duration will likely suffer from reperfusion injury.
- Prevention can include administration of a therapeutic agent one or more times to a subject, e.g., a long standing prophylactic regimen to prevent aberrant angiogenesis, or a single dose in response to an acute event such as ischemia.
- Prevention can include a reduction in the level of signs or symptoms observed of the condition and need not completely eliminate all signs or symptoms of disease.
- Prevention can include a delay in the first onset of signs or symptoms of a disease or condition and need not prevent signs or symptoms from ever being present.
- Prevention, amelioration, and or treatment of a disease is typically practiced on a subject first identified as being prone to or suffering from a disease or condition. During and after prevention, amelioration, and treatment of a disease or condition, a subject is typically monitored for signs or symptoms of the disease or condition.
- amelioration refers to a reduction of signs or symptoms of a specific disease or condition.
- Treatment refers to reduction of signs or symptoms of a disease or condition to reduce or eliminate signs or symptoms of the disease or condition, or to prevent progression of the disease or condition.
- Prevention, amelioration, and treatment need not be considered separate interventions, but instead can be considered a continuum of - therapeutic interventions.
- parstatin peptides disclosed herein have a wide range of therapeutic applications, including one or more of:
- renal disorders preferably parstatin 1-41
- protecting from acute renal injury for example, in ischemia, contrast-induced nephopathy, reperfusion-induced nephropathy) (preferably parstatin 1-41); inhibiting angiogenesis and treating angiogenesis related disorders (preferably parstatin 1- 41);
- microvessel formation preferably parstatin 1-41
- capillary tube-like formation and migration of endothelial cells preferably parstatin 1-41
- inhibiting the growth of endothelial cells preferably parstatin 1-41
- inhibiting DNA synthesis in endothelial cells preferably parstatin 1-41
- inhibiting signalling through the MAP kinase pathway preferably parstatin 1-41
- suppressing choroidal neovascularisation preferably parstatin 1-41 , parstatin 1-26 and parstatin 24 ⁇ 1, more preferably, parstatin 24-41
- suppressing retinal neovascularisation preferably parstatin 1-41, parstatin 1-26 and parstatin 24-41 , more preferably, parstatin 24-41
- suppressing corneal neovascularisation preferably parstatin 1-41 , parstatin 1-26 and parstatin 24-41, more preferably, parstatin 24-41, parstatin 1-26
- cardioprotection preferably parstatin 1-26
- attenuating myocardial ischemia reperfusion injury preferably parstatin 1-41 , parstatin 1- 26
- endothelium dependent coronary vasodilation preferably parstatin 1-41.
- the invention may also include methods of identifying a subject suffering from, suspected of suffering from, or prone to suffering from any of the above-mentioned disorders, including but no limited to angiogenesis-related diseases, ocular neovascularisation and related disease states, ischemia-reperfusion injury and myocardial-related disease states, and acute renal failure and related disease states.
- the invention may include monitoring these subjects before, during and after treatment for these conditions.
- the present invention relates to peptides, methods and compositions for preventing, ameliorating, and/or treating angiogenesis related diseases, diseases having an angiogenic component, and processes mediated by undesired and uncontrolled angiogenesis by administrating to a subject with the undesired angiogenesis a composition comprising a parstatin or a substantially purified parstatin or parstatin derivatives or variants in a dosage sufficient to prevent or inhibit angiogenesis.
- one aspect of the invention relates to an isolated peptide or a composition as described above for preventing, ameliorating or treating angiogenesis or an angiogenesis associated disease.
- the peptides can be administered alone or in conjunction with other agents for the prevention, amelioration, and/or treatment of angiogenesis related diseases.
- the other agents can be anti-angiogenic agents.
- the agents can function to prevent, ameliorate, or treat disease by distinct methods, e.g. anti-proliferative agents for the treatment of cancer or anti-inflammatory agents for the treatment of arthritis.
- the peptides or compositions of the invention can be used in the prevention, amelioration and treatment of angiogenesis or angiogenesis associated diseases, and also in the preparation of a- medicament for the ⁇ treatment of angiogenesis or angiogenesis associated-diseases.
- angiogenesis is understood as a physiological process involving the growth of new blood vessels from pre-existing vessels, including vasculogenesis.
- Vasculogenesis is the term used for spontaneous blood-vessel formation.
- Angiogenesis is a normal process in growth and development, as well as in wound healing. However, this is also a fundamental step in the transition of tumors from a dormant state to a malignant state.
- Angiogenesis is promoted by biological signals known as angiogenic growth factors that activate receptors present on endothelial cells present in pre-existing venular blood vessels.
- the activated endothelial cells begin to release enzymes called proteases that degrade the basement membrane in order to allow endothelial cells to escape from the original (parent) vessel walls.
- the endothelial cells then proliferate into the surrounding matrix and form solid sprouts or processes connecting neighboring vessels.
- sprouts extend toward the source of the angiogenic stimulus, endothelial cells migrate in tandem, using integrin adhesion molecules. These sprouts then form loops to become a full- fertilged vessel lumen as cells migrate to the site of angiogenesis. Sprouting occurs at a rate of several millimeters per day, and enables new vessels to grow across gaps in the vasculature.
- the invention preferably involves administering a parstatin peptide to a subject suspected of suffering from or suffering from an angiogenesis related disease in an effective therapeutic dose, and preferably observing the subject to detect a decrease in the signs and/or symptoms of the angiogenesis-related disease.
- Inhibition of angiogenesis can be defined by a prevention and inhibition of endothelial cell growth, a decrease in endothelial cell migration and/or differentiation and/or vascular tube formation.
- angiogenesis associated diseases includes diseases related to excessive and aberrant angiogenesis. These include, but are not limited to, ocular diseases ⁇ associated with angiogenesis including, but not limited to retinal and ocular ischemic diseases such as macular degeneration including age-related macular degeneration (AMD), diabetic retinopathy (DR), neovascular glaucoma, ocular neovascular disease, retinopathy of prematurity (ROP) and other developmental disorders, a result of ocular infections, mechanical or chemical injury to the cornea and the eye in general.
- AMD age-related macular degeneration
- DR diabetic retinopathy
- ROP retinopathy of prematurity
- the angiogenesis associated disease is an ocular disease. More preferably, the ocular disease is ocular neovascularisation, corneal neovascularisation or ocular inflammation.
- the peptides or compositions described herein have therapeutic applications in the prevention, amelioration and treatment of neovascular ocular diseases, corneal neovascularisation and ocular inflammation, and also in the manufacture of a medicament for the treatment of neovascular ocular diseases, corneal neovascularisation and ocular inflammation.
- the peptides of the invention can be administered alone or in conjunction with other agents for the prevention, amelioration, and/or treatment of neovascular ocular diseases or related diseases such as corneal neovascularisation or ocular inflammation.
- the methods may be conducted by administrating to a human or animal a composition comprising a substantially purified parstatin peptide or parstatin derivatives or variants in a therapeutically effective dose to prevent, treat, or ameliorate one or more symptoms associated with, neovascular ocular diseases and/or to prevent or treat conditions characterized by neovascular ocular diseases.
- One aspect of the invention relates to a method of preventing or treating angiogenesis or an angiogenesis associated disease in a subject, said method comprising administering to the subject an isolated peptide or a composition as described above.
- the methods of treating or preventing neovascular ocular diseases preferably involve contacting the eye of a subject with the peptide or composition of the invention.
- the methods may further comprise identifying a subject suffering for or suspected of suffering from an angiogenesis associated disease.
- the methods may further comprise monitoring a subject suffering for or suspected of suffering from an angiogenesis associated disease.
- Angiogenesis associated diseases can also occur outside of the eye and include, but are not limited to chronic inflammation, arthritis, rheumatoid arthritis, osteoarthritis, ulcerative colitis, Crohn's disease, psoriasis, cancer, atherosclerosis, restenosis, intimal hyperplasia, chronic inflammatory diseases such as angiogenesis-related tumor growth and/or metastasis, ischemia/reperfusion injury and pulmonary hypertension. Many ischemia related conditions are associated with insufficient angiogenesis including, but not limited to, coronary artery disease, stroke, and chronic wounds.
- the peptides of the invention are also useful for treating, preventing or ameliorating one or more symptoms associated with diseases and conditions characterized by aberrant angiogenic activity and/or endothelial cell dysfunction.
- diseases and conditions include, but not limited, to angiogenesis-related tumor growth and metastasis, ocular neovascular diseases, rheumatoid arthritis, chronic inflammation, ischemia/reperfusion injury, restenosis, pulmonary hypertension, atheroscherosis, intimal hyperplasia.
- diseases and conditions include, but not limited, to angiogenesis-related tumor growth and metastasis, ocular neovascular diseases, rheumatoid arthritis, chronic inflammation, ischemia/reperfusion injury, restenosis, pulmonary hypertension, atheroscherosis, intimal hyperplasia.
- such methods are carried out by contacting a cell or a tissue undergoing pathological angiogenesis with a peptide of the invention.
- a further aspect of the invention relates to an isolated peptide or a composition as described above for preventing, ameliorating or treating myocardial-related disease or ischemia-reperfusion injury.
- the isolated peptide or composition is for preventing, ameliorating or treating ischemia-reperfusion injury that is associated with, or arises from, surgery, e.g. ischemic injury related to surgery.
- Another aspect of the invention relates to the use of an isolated peptide or a composition as-described above in the preparation ⁇ of a medicament forthe treatment of myocardial-related-disease or ischemia-reperfusion injuny.
- Another aspect of the invention relates to the use of an isolated peptide or a composition as described above as a myocardial protective agent.
- a further aspect relates to a method of preventing or treating myocardial-related disease or ischemia-reperfusion injury in a subject, said method comprising administering to the subject an isolated peptide or composition as described above.
- the invention further includes compositions and methods of prevention, amelioration, or treatment of ischemia-reperfusion injury including myocardial ischemia-reperfusion injury, comprising using a polypeptide comprising a parstatin peptide or contacting the myocardium with a polypeptide comprising a parstatin peptide.
- the methods of prevention or treatment of myocardial-related disease or ischemia- reperfusion injury may comprising administering to the subject a parstatin peptide or composition comprising a parstatin peptide.
- the administration of the parstatin peptide or composition may involve contacting the heart of a subject with the parstatin peptide or composition.
- These methods may further comprise identifying a subject suffering for or suspected of suffering from myocardial-related disease or ischemia- reperfusion injury.
- These methods may further comprise monitoring a subject suffering for or suspected of suffering from myocardial-related disease or ischemia- reperfusion injury.
- the present invention also provides methods and compositions for treating diseases and processes mediated by endothelial cell dysfunction and cardiovascular complications by administrating to a subject a composition comprising a substantially purified parstatin peptide or parstatin derivatives or variants in a therapeutically effective dose to prevent, treat, or ameliorate one or more symptoms associated with endothelium dysfunction diseases or angiogenesis, and/or to prevent or treat conditions characterized by cardiovascular complications.
- Another aspect of the invention relates to an isolated peptide or a composition as described above for preventing or inhibiting endothelial cell growth.
- a further aspect relates to the use of an isolated peptide or a composition as described above in the preparation of a medicament for preventing or inhibiting endothelial cell growth.
- Another aspect of the invention relates to a method of inducing cell death and/or apoptosis or cell cycle arrest in mammalian endothelial cells, said method comprising contacting mammalian endothelial cells with an isolated or a composition as described above.
- Endothelial cell growth can be defined by any of a number of criteria including, but not limited to, inhibition endothelial cell proliferation, inhibition of DNA synthesis, and inhibition of mitogenic intracellular biochemical pathways as compared to endothelial cells not treated with a parstatin polypeptide.
- Prevention and inhibition of endothelial cell growth can also include inhibition of angiogenesis which can be defined by a decrease in endothelial cell migration and/or differentiation.
- the invention includes prevention and/or inhibition of endothelial cell growth in culture or in an animal.
- the peptides or compositions of the present invention also have therapeutic applications in the prevention, amelioration and treatment of renal disorders, such as ischemia reperfusion injury.
- a further aspect of the invention therefore relates to an isolated peptide or a composition as described above for preventing, ameliorating or treating a renal disorder.
- the renal disorder may be renal failure.
- the renal failure may be chronic renal failure or acute renal failure related to known ischemic events (e.g., surgery). Many types of surgery present the possibility of renal ischemia/ reperfusion injury. For example, in urology and nephrology, where renal ischemia-reperfusion injury occurs following several surgicai operations.
- Administration of the peptides, methods and compositions of the instant invention can prevent renal ischemia-reperfusion injury by ameliorating or eliminating the damage caused by reperfusion injury, for example by administration of the compound prior to the ischemic event.
- Administration of the compounds of the invention during or after the event can ameliorate or treat the damage caused by ischemia-reperfusion injury.
- Renal failure may be caused by a renal injuring or renal failure event including, but not limited to, ischemia-reperfusion injury, kidney transplantation, administration of radiocontrast agents, administration of chemotherapy, contrast-induced nephropathy, sepsis and/or heart failure.
- a renal injuring or renal failure event including, but not limited to, ischemia-reperfusion injury, kidney transplantation, administration of radiocontrast agents, administration of chemotherapy, contrast-induced nephropathy, sepsis and/or heart failure.
- the renal disorder is a renal ischemia-reperfusion injury or acute renal failure.
- a further aspect of the invention relates to the use of an isolated peptide or a composition as described above in the preparation of a medicament for the treatment of a renal disorder.
- Another aspect of the invention relates to the use of an isolated peptide according or a composition as described above as a renal protective agent.
- Another aspect of the invention relates to a method of preventing or treating a renal disorder in a subject, said method comprising administering to the subject an isolated peptide or a composition as described above.
- the peptide is administered prior to an expected renal injuring event or renal failure event. More preferably, the peptide is administered 1 hour or less, 2 hours or less, 3 hours or less, 4 hours or less, 6 hours or less, 8 hours or less, 12 hours or less, 16 hours or less, 20 hours or less, 24 hours or less, 36 hours or less, or 48 hours or less before an expected renal injuring event or renal failure event.
- the peptides or compositions of the present invention also have therapeutic applications in the prevention, amelioration and treatment of inflammatory diseases,
- the inflammatory disease is ocular inflammation.
- the inflammatory disease may be angiogenesis or angiogenesis associated disease.
- the inflammatory disease may be corneal neovascularization.
- Methods of treating or preventing inflammatory diseases and encompasses and such method diseases preferably involve contacting subject with the peptide or composition of the invention.
- the methods may further comprise identifying a subject suffering for or suspected of suffering from an inflammatory disease.
- the methods may further comprise monitoring a subject suffering for or suspected of suffering from an inflammatory disease.
- obtaining refers to purchase, procure, manufacture, or otherwise come into possession of.
- Providing refers to obtaining, by for example, buying or making the, e.g., polypeptide, drug, polynucleotide, probe, and the like.
- the material provided may be made by any known or later developed biochemical or other technique.
- peptides may be obtained from cultured ceils.
- the cultured cells for example, may comprise an expression construct comprising a nucleic acid segment encoding the peptide.
- subject includes organisms which are capable of suffering from disease or who could otherwise benefit from the administration of a compound or composition of the invention, such as human and non-human animals.
- the subject is a human animal.
- Preferred human animals include human patients suffering from or prone to suffering from a disease or associated state, as described herein.
- non-human animals of the invention includes all vertebrates, e.g., mammals, e.g., rodents, e.g., mice, and non-mammals, such as non-human primates, e.g., sheep, dog, cow, chickens, amphibians, reptiles, etc.
- Veterinary applications are also encompassed.
- Another aspect relates to a pharmaceutical composition
- a pharmaceutical composition comprising an isolated peptide according to the invention, and a pharmaceutically acceptable diluent, excipient or carrier.
- a pharmaceutically acceptable diluent, excipient or carrier Even though the peptides of the present invention (including their pharmaceutically acceptable salts, esters and pharmaceutically acceptable solvates) can be administered alone, they will generally be administered in admixture with a pharmaceutical earner, excipient or diluent, particularly for human therapy.
- the pharmaceutical compositions may be for human or animal usage in human and veterinary medicine.
- Acceptable carriers or diluents for therapeutic use are well known in the pharmaceutical art, and are described, for example, in Remington's Pharmaceutical Sciences, Mack Publishing Co. (A. R. Gennaro edit. 1985).
- suitable carriers include lactose, starch, glucose, methyl cellulose, magnesium stearate, mannitol, sorbitol and the like.
- suitable diluents include ethanol, saline, glycerol and water.
- compositions may comprise as, or in addition to, the carrier, excipient or diluent any suitable binder(s), lubricant(s), suspending agent(s), coating agent(s), solubilising agent(s), wetting or emulsifying agents, pH buffering substances, and the like.
- Suitable binders include starch, gelatin, natural sugars such as glucose, anhydrous lactose, free-flow lactose, beta-lactose, corn sweeteners, natural and synthetic gums, such as acacia, tragacanth or sodium alginate, carboxymethyl cellulose and polyethylene glycol.
- Suitable lubricants include sodium oleate, sodium stearate, magnesium stearate, sodium benzoate, sodium acetate, sodium chloride and the like.
- Preservatives, stabilizers, dyes and even flavoring agents may be provided in the pharmaceutical composition.
- preservatives include sodium benzoate, sorbic acid and esters of p-hydroxybenzoic acid.
- Antioxidants and suspending agents may be also used.
- compositions of the present invention may be adapted for oral, rectal, vaginal, parenteral, intramuscular, intraperitoneal, intraarterial, intrathecal, intrabronchial, subcutaneous, intradermal, intravenous, nasal, buccal or sublingual routes of administration.
- Formulations suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostatics and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents.
- the formulations may be presented in unit-dose or multi-dose containers, for example, sealed ampoules and vials, and may be stored in a freeze-dried (lyophilized) condition requiring only the addition of the sterile liquid carrier, for example, water for injections, immediately prior to use.
- Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules and tablets of the kind previously described.
- compositions of the present invention may also be in form of suppositories, pessaries, suspensions, emulsions, lotions, ointments, creams, gels, sprays, solutions or dusting powders.
- the active ingredient can be incorporated into a cream consisting of an aqueous emulsion of polyethylene glycols or liquid paraffin.
- the active ingredient can also be incorporated, at a concentration of between 1 and 10% by weight, into an ointment consisting of a white wax or white soft paraffin base together with such stabilisers and preservatives as may be required.
- compositions may be formulated in unit dosage form, i.e. in the form of discrete portions containing a unit dose, or a multiple or sub-unit of a unit dose.
- Preferred unit dosage formulations are those containing a daily dose or unit, daily sub- dose, as herein above recited, or an appropriate fraction thereof, of the administered ingredient. It should be understood that in addition to the ingredients, particularly mentioned above, the formulations of the present invention may include other agents conventional in the art having regard to the type of formulation in question. Dosage
- a person of ordinary skill in the art can easily determine an appropriate dose of one of the instant compositions to administer to a subject without undue experimentation.
- a physician will determine the actual dosage which will be most suitable for an individual "patient and it will depend on a variety of factors including ⁇ 1he activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the individual undergoing therapy.
- the dosages disclosed herein are exemplary of the average case. There can of course be individual instances where higher or lower dosage ranges are merited, and such are within the scope of this invention.
- the peptide can be administered between several times per day to once a week. It is to be understood that the present invention has application for both human and veterinary use. The methods of the present invention contemplate single as well as multiple administrations, given either simultaneously or over an extended period of time.
- the invention also includes nucleic acid sequences that correspond to and code for the bioactive peptide molecules of the invention (i.e. peptides such as SEQ ID NO:1 , SEQ ID NO:2 and SEQ ID NO:3), to monoclonal and polyclonal antibodies that bind specifically to such peptides molecules and DNA or RNA oligonucleotides (aptamers) that bind specifically to such peptide molecules.
- peptides such as SEQ ID NO:1 , SEQ ID NO:2 and SEQ ID NO:3
- nucleic acid sequence encoding a peptide as described above, or a variant, derivative, fragment or homologue thereof.
- the nucleic acid sequence is at least at least about 70% identity, at least about 80% identity, at least about 90%-identity at-least about 95% identity, preferably at least about 99% identity to the nucleic acid sequence-encoding the peptiderof the invention.
- the invention also encompasses nucleic acid sequences which are complementary to the nucleotide sequences as described above, as well as variants, derivatives,
- the biologically active peptide molecules, nucleic acid sequences corresponding to the peptides, antibodies and aptamers that bind specifically to the peptides of the present invention are useful for modulating endothelial processes in vivo, and for diagnosing and treating endothelial cell-related diseases, for example by gene therapy.
- Nucleic acid sequences that correspond to, and code for, parstatin and parstatjn analogs can be prepared based upon the knowledge of the amino acid sequence, and the art recognized correspondence between codons, and amino acids.
- Nucleic acid sequences are synthesized using automated systems well known in the art. Either the entire sequence may be synthesized or a series of smaller oligonucleotides are made and subsequently ligated together to yield the full length sequence. Alternatively, the nuclei acid sequence may be derived from a gene bank using oligonucleotides probes based on the N-terminal amino acid sequence and well known techniques for cloning genetic material.
- nucleotide sequence and “nucleic acid sequence” are used interchangeably throughout herein.
- the present invention also includes oligonucleotide aptamers, which can be DNA aptamers or RNA aptamers, specific for the parstatin.
- the antibodies and aptamers specific for parstatin can be used in diagnostic kits to detect the presence and quantity of parstatin as index of activated PARI in vivo which is diagnostic or prognostic for the occurrence or recurrence of cancer or other disease mediated by angiogenesis.
- Antibodies and aptamers specific for parstatin can also be administered to a human or animal against endogenous parstatin, thereby stimulating angiogenesis in situations where promotion of angiogenesis is desirable, such as in wound healing and non-healing ulcers.
- Antibodies and aptamers specific for parstatin can also be administered to a human or animal against endogenous parstatin, thereby stimulating angiogenesis in situations where promotion of angiogenesis is desirable, such as in wound healing and non-healing ulcers.
- a further aspect relates to antibodies targeted to a peptide according to the invention, or a variant, derivative, fragment or homologue thereof.
- the antibodies can be polyclonal antibodies or monoclonal antibodies, specific for the parstatin peptides of the invention.
- Passive antibody therapy using antibodies that specifically bind to the peptides of the invention can be employed to modulate endothelial-dependent processes such as reproduction, development, and wound healing and tissue repair.
- Antibodies specific for parstatin, parstatin peptides, and parstatin analogs are made according to techniques and protocols well known in the art.
- the antibodies are utilized in well know immunoassay formats, such as competitive and non-competitive immunoassays, including ELISA, sandwich immunoassays, and radioimmunoassay (RIAs), to determine the presence or absence of the endothelial proliferation inhibitors of the present invention in body fluids.
- immunoassay formats such as competitive and non-competitive immunoassays, including ELISA, sandwich immunoassays, and radioimmunoassay (RIAs)
- ELISA ELISA
- sandwich immunoassays sandwich immunoassays
- RIAs radioimmunoassay
- body fluids include but are not limited to blood, serum, peritoneal fluid, pleural fluid, cerebrospinal fluid, uterine fluid, saliva and mucus.
- Oligonucleotides therapy using aptamers that specifically bind parstatin can be employed to modulate endothelial-dependent processes such as reproduction, development, wound healing, and tissue repair.
- the term "aptamers” refers to nucleic acid molecules (DNA or RNA) having specific binding affinity to molecules through interactions other than classic Watson-Crick base pairing. Aptamers, like peptides generated by phage display or monoclonal antibodies are capable of specifically binding to selected targets and modulating the target's activity or binding interactions, e.g., through binding aptamers may block their target's ability to function. Aptamers specific for parstatin and parstatin analogs are made according to techniques and protocols well known in the art. A typical aptamer is 10-15 kDa in size (20-45 nucleotides), binds its target with nanomolar to sub-nanomolar affinity, and discriminates against closely related targets.
- the present invention also includes diagnostic methods and kits for detection and measurement of parstatin peptides in samples (e.g. biological fluids and tissues), and for localization of parstatin peptides in tissues.
- the diagnostic method and kit can be in any configuration well known to those of ordinary skill in the art. Kits can further include packaging material and/or instructions for use of the components of the kits. Kits can include antibodies targeted to parstatin peptides, including fragments of parstatin.
- the present invention relates to diagnostic assays and kits for assessing parstatin both in vitro and in vivo, histochemical kits for localization of parstatin in cells, molecular probes to monitor parstatin biosynthesis, and antibodies that are specific for parstatin.
- the present invention also includes parstatin peptides and fragments that are labeled isotopically or with other molecules for use in the detection and visualization of parstatin binding sites with state of the art techniques, including, but not limited to, positron emission tomography, autoradiography, flow cytometry, radioreceptor binding assays, and immunohistochemistry. Such peptides and fragments can be conveniently included in kits, optionally containing instructions for use.
- the present invention also includes methods for the detection of parstatin peptides in body fluids and tissues for the purpose of diagnosis or prognosis of angiogenesis- mediated diseases such as cancer, cardiovascular diseases, ocular diseases, and arthritis.
- Antibodies and aptamers that specifically bind to the parstatin can be used in diagnostic methods and kits that are well known to those of ordinary skill in the art to detect or quantify the parstatin in a body fluid or tissue. Results from these tests can be used to diagnose or predict the occurrence or reccurrence of a cancer and other angiogenesis mediated diseases and pathophysiological processes wherein PAR-1 is involved.
- The-present invention further includes methods for the detection of parstatin binding-sites and receptors in cells and tissues, in vitro and in vivo.
- the present invention also includes methods of treating or preventing diseases and processes including, but not limited to, arthritis, diabetic retinopathy and tumors by stimulating the production of parstatin, and/or by administrating substantially purified parstatin polypeptides, parstatin agonists, or parstatin antagonists.
- the peptides, nucleic acid sequences, antibodies, and aptamers of the present invention are useful for diagnosing and treating endothelial cell-related diseases and disorders.
- a particularly important endothelial cell process is angiogenesis, the formation of blood vessels, as discussed above.
- Angiogenesis-related diseases may be diagnosed and treated using the endothelial cell proliferation inhibiting proteins of the present invention, i.e., parstatin peptides and analogs.
- Angiogenesis-related diseases include, but are not limited to, angiogenesis-dependent cancer (solid tumors, blood born tumors such as leukemias, ands tumor metastases; benign tumors, for example hemangiomas, acoustic neuromas, neurofibromas), rheumatoid arthritis, psoriasis, ocular angiogenic diseases (diabetic retinopathy, petinopathy of prematurity, macular degeneration, corneal graft rejection, neovascular glaucoma, retrolental fibroplasias), myocardial angiogenesis, plaque neovascularization, and wound granulation.
- angiogenesis-dependent cancer solid tumors, blood born tumors such as leukemias, ands tumor metastases
- benign tumors for example hemangiomas, acoustic neuromas, neurofibromas
- psoriasis rheumatoid arthritis
- ocular angiogenic diseases diabetic
- the parstatin endothelial cell proliferation inhibiting peptides of the present invention are useful in the treatment of disease of excessive or abnormal stimulation of endothelial cells.
- diseases include, but are not limited to, intestinal adhesions, atherosclerosis, scleroderma and hypertrophic scars, i.e., keloids. They are also useful in the treatment of diseases that have angiogenesis as a pathologic consequence such as cat scratch disease (Rochele minalia quintosa) and ulcers (Helobacter pylori).
- blockade of parstatin receptors with parstatin analogs which act as receptor antagonists as well as blockade of parstatin molecules with antibodies or aptamers, which specifically bind and inhibit parstatin biological activity may promote endothelialization and vascularization.
- Such effects may be desirable in situations of inadequate vascularization of the uterine endometrium and associated infertility, wound repair, healing of- cuts and incisions, treatment- oLvascular problems in diabetics, especially retinal and peripheral vessel, peripheral angiopathies, especially peripheral ischemic vascular disorders, promotion of vascularization in transplanted tissue including muscle and skin, promotion of vascularization of cardiac muscle especially following transplantation of a heart or heart tissue and after bypass surgery, promotion of vascularization of solid and relatively avascular tumors for enhanced cytotoxin delivery, and enhancement of blood flow to the nervous system, including but not limited to the cerebral cortex and spinal cord.
- the amino acid sequence of the peptide is known and the parstatin can be synthesized by technique well known in the art, as exemplified by "Solid Phase Peptide Synthesis: A Practical Approach” E. Atherton and R. C. Sheppard, IRL Press, Oxford, England. Similarly, multiple fragments can be synthesized which are subsequently linked together to form larger fragments. These synthesis peptide fragments can also be made with amino acid substitutions at specific locations in order to test for agonistic and antagonistic activity in vitro and in vivo. Peptide fragments that possess high affinity binding to tissues can be used to isolate the parstatin receptor on affinity columns.
- Isolation and purification of the parstatin receptor is a fundamental step towards elucidating the mechanism of action of parstatin. This facilitates development of drugs to modulate the activity of the parstatin receptor, the final pathway to biological activity. Isolation of the receptor enables the construction of nucleotide probes to monitor the location and synthesis of the receptor, using in situ and solution hybridization technology.
- the synthetic peptide fragments of parstatin have a variety of uses.
- the peptide that binds to the parstatin receptor with high specificity and avidity can be detectably labeled, e.g., radiolabeled or fluorescently labeled, and employed for visualization and quantitation of binding sites using known techniques, such as membrane binding techniques. This application provides important diagnosis and research tools.
- Therapeutic agents of the instant invention can be coadministered with other drugs or therapeutic agents.
- “Co-administering,” as used herein refers to the administration with another agent, either at the same time, in the same composition, at alternating times, in separate compositions, or combinations thereof.
- peptides and compositions of the present invention can be used alone or in combination with other compositions and procedures for the treatment of diseases.
- a tumor may be treated conventionally with surgery, radiation, and/or chemotherapy combined with parstatin and then parstatin may be subsequently administered to the patient to extend the dormancy of micrometastases and/or to stabilize any residual primary tumor.
- Cytotoxic and antiangiogenic compounds may also be used in medical devices, e.g. as drug eluting stents to prevent restenosis and intimal hyperplasia.
- a vascular endoprosthetic device e.g., a stent
- the composition is impregnated in the device or the device is coated with the peptide of the invention.
- the peptides and peptides fragments with the parstatin activity described above can be provided as isolated and substantially purified peptides and peptides fragments in pharmaceutically acceptable formulations using formulation methods known to those of ordinary skill in the art. These formulations can be administered by standard routes. In general, the combinations may be administered by the topical, transdermal, intraperitoneal, intracranial, intracerebroventricular, intracerebral; intravaginal, intrauterine, oral, rectal, or parenteral (e.g., intravenous, intraspinal, subcutaneous, or intramuscular)- route.
- parenteral e.g., intravenous, intraspinal, subcutaneous, or intramuscular
- parstatin may be incorporated into biodegradable polymers allowing for sustained release of compound, the polymers being implanted in the vicinity of where drug delivery is desired, for example, at the site of a tumor or implanted so that the parstatin is slowly released systemically.
- Osmotic minipumps may also be used to provide controlled delivery of high concentrations of peptides through cannulae to the site of interest, e.g., directly into a metastatic growth or into the vascular supply to that tumor.
- the invention is further illustrated by the following non-limiting examples.
- Parstatin peptides used in our assays were synthesized in the core peptide facility of Peptide Specialty Laboratories GmbH (Heidelberg, Germany) or Bio-Synthesis Inc., (Lewisville, TX) or at the Protein and Nucleic Acid Shared Facility at the Medical College of Wisconsin. Synthesized peptides were purified by HPLC technology, characterized by mass spectrometry technology and sequenced. The synthesized peptides were as follows:
- parstatin parstatin (1-41), which corresponds to 1-41-amino acids cleaved N-terminal fragment of human PARI .
- Mouse parstatin which corresponds to 1-41-amino acids cleaved N-terminal fragment of mouse PAR-1.
- Modulated human parstatin-FITC which fluorescein isothiocyanate (FITC) is conjugated to modulated human parstatin. Sequence: FITC-Ahx- MGPRRLLLVAACFSirCGPLLSARALTRSAPTPRDRANKETR.
- Example 2 Parstatin (1-41 ) inhibits angiogenesis in vivo.
- CAM chick chorioallontoic membrane
- Parstatin (1-41) was very potent anti-angiogenic substance (Fig. 1A).
- the anti-angiogenic effect of parstatin was more pronounced when angiogenesis was stimulated by growth factors such as bFGF or VEGF.
- the application of scrambled parstatin, at concentration similar to that of human (10 nmoles) did not cause any significant effect.
- Example 3- Parstatin (1-41) inhibits angiogenesis in rat aortic ring assay.
- angiogenesis in vivo involves not only endothelial cells but also their surrounding cells, has led to development of angiogenic assays using organ culture methods. Of these, the rat aortic ring assay has become the most widely used.
- Freshly cut aortic rings obtained from 5- to 10-week-old Fischer 344 male rats were embedded in collagen gels and transferred to 16-mm wells (4-well NUNC dishes) each containing 0:5 ml serum-free endothelial basal medium (EBM, Clonetics Corporation) alone or supplemented with VEGF or bFGF.
- the angiogenic response of aortic cultures was measured in the live cultures by counting the number of neovessels over time using art accepted methods. Mean number of microvessels ⁇ SE was determined. Statistical analysis was performed using unpaired two-tailed t-test.
- Parstatin (1-41) inhibited microvessel formation (Fig. 2A). This inhibitory effect was in a dose dependent manner, with complete inhibition at a 10 ⁇ , and was also evident either in basal conditions or in VEGF- or bFGF-induced angiogenesis (Fig 2B). Again, the ability of parstatin to function across species is noted. Human parstatin (1-41) effectively inhibits angiogenesis in rat tissue in a non-species specific, dose dependent manner.
- Example 4 Parstatin (1-41) inhibits capillary tube-like formation and migration of primary human endothelial cells.
- Primary human umbilical vein endothelial cells (HUVEC cells) were obtained from freshly delivered umbilical cords from caesarean births and were grown in M199 medium with 20% fetal bovine serum (FBS) supplemented with endothelial cell growth supplement and heparin.
- FBS fetal bovine serum
- One of the most specific tests for angiogenesis is the measurement of the ability of endothelial cells to form capillary-like structures (i.e., tube formation). Tube formation is a multi-step process involving cell adhesion, migration and differentiation. Tube formation can be enhanced by use of Matrigel or fibrin clots to coat plastic culture dishes and it is an accepted model of angiogenesis.
- MatrigelTM (Becton Dickinson Labware, NJ, USA) is a mixture of basement membrane components extracted from the Englebreth-Holm-Swarm tumor. It has been demonstrated that endothelial cells attach, migrate, and assemble to form tube-like structure resembling capillaries within 18 hours of plating. MatrigelTM (250 ⁇ ) was added to each well of a 24-well plate and allowed to polymerize. A suspension of 40,000 HUVEC cells in M199 medium containing 5% FBS was added into each well coated with MatrigelTM.
- parstatin (1-41) When parstatin (1-41) was tested in MatrigelTM model, it exhibited a significant inhibitory effect on the rate and extent of tube formation (Fig. 3A). At concentrations ranging from 0.3 to 10 ⁇ , parstatin (1-41) caused a dose-dependent inhibition of tube formation by endothelial cells plated on medium containing 5% serum. Mouse parstatin was effective in inhibiting tube formation by human cells.
- Endothelial cells The ability of endothelial cells to form three-dimensional structures was analyzed using a Fibrin gel in vitro angiogenesis assay kit (Chemicon International Inc. Temecula, CA). Fibrin gels were formed in 48-well plates by mixing fibrinogen and thrombin solutions, according to manufacturer instructions. Cells (40,000 cells/well) were then added and cultured in medium containing 2% FBS for 18 h. After the addition of a second layer of fibrin gel, endothelial cells sandwiched within fibrin gels were cultured in serum-free medium containing 0.5% bovine serum albumin (BSA) and the combination of VEGF/bFGF for 24 h. Where indicated, parstatin (1-41 ) or other indicated peptides were added. Capillary-like network was photographed and measured.
- BSA bovine serum albumin
- HUVEC cell migration was assessed using a modified Boyden's chamber assay, i.e., in Transwell cell culture chambers (Corning Life Sciences, Acton, MA). Briefly, polycarbonate filters with 8 m pores were used to separate the upper and the lower chambers. Cells were added to the upper compartment at a density of 10,000 cells/100 ⁇ in serum-free medium containing 0.5% BSA and incubated for 6 h. Directional migration (chemotaxis) in the lower chamber was induced by addition of medium containing 5% FBS to the lower chamber. Where indicated parstatin or other peptides were added to lower chamber.
- parstatin (1-41 ) attenuated chemotactic cell migration through microporous membrane in response to serum (Fig. 3C).
- human parstatin was combined with 5% FBS, the number of migrated cells was reduced in concentration-dependent manner. Again, scrambled parstatin and parstatin (24-41) were without effect.
- Mouse parstatin (1-41) caused a significant inhibitory effect, but to a lower extent as compared to human parstatin (1- 41).
- Cell proliferation was evaluated using a 3-(4,5-dimethyl-2-yl)-2,5-diphenyltetrazolium bromide (MTT, Sigma-Aldrich, St.Louis, MO) assay.
- Endothelial cells (10,000/well) were seeded in 24-well tissue culture plates and incubated with growth medium for 24 h. Cells were then treated with the vehicle or the indicated peptides in medium containing 5% FBS for 1 to 3 days. After 24, 48, or 72 hours, MTT solution (5mg/ml) was added to each well and incubated for 3 h at 37°C. The blue formazan crystals were solubilized by addition of DMSO and absorbance at 450nm was recorded using a 96-wel
- MTT 3-(4,5-dimethyl-2-yl)-2,5-diphenyltetrazolium bromide
- Endothelial cell number doubled every 18 to 26h over the 72-h period.
- the rate of endothelial cell growth was significantly decreased (Fig. 4).
- HUVEC cell proliferation was essentially blocked by parstatin (1-41) at 10 ⁇ . This inhibitory effect of parstatin was dose-dependent with half-maximal inhibitory concentration at approximately 3 ⁇ .
- parstatin (1-41) to inhibit DNA synthesis of endothelial cells was assessed in thymidine incorporation assays.
- HUVEC cells were grown until 60-80% confluent in 24-well plates. Cells were treated with indicated peptides in serum-free medium containing either 0.5% BSA, or VEGF, or bFGF, or medium containing 5% FBS, or epidermal growth factor (EGF), or heparin-binging EGF (HB-EGF) for 18 hours. All cells were pulsed with 0.5 Ci/ml [3H]-thymidine (ICN Biomedicals Inc., Irvine CA) for additional 6 h. Radioactivity incorporated into DNA was determined in liquid scintillation counter.
- Parstatin (1-41) reduced DNA synthesis in HUVEC cells in a dose-dependent manner, with the inhibitory effect on bFGF- or VEGF-stimulated DNA synthesis being more substantial than that of serum (Fig. 5A). These data demonstrate more potent activity of parstatin (1-41) on dividing cells rather than quiescent cells.
- parstatin (1-41) When DNA synthesis experiments were, repeated with cells. that were- in quiescent state (100% confluent), the inhibitory effect of parstatin (1-41) was less pronounced (21.6% + 7.4 inhibition by 10 ⁇ parstatin (1-41) in 5% FBS versus 47.3 ⁇ 6.1 on fast- growing cells), indicating a more substantial inhibitory effect for parstatin (1-41) on stimulated endothelial cells.
- parstatin (1-41) The continuous presence of parstatin (1-41) in cell culture was not necessary, since DNA synthesis inhibition was also evident after short exposure of cells to parstatin (1- 41). Even at the earlier time studied of 30 min exposure, the inhibition of VEGF- induced DNA synthesis was 70% of the maximum (exposure for 24 h) and did not increase further after 1 h exposure to parstatin (1-41). These data demonstrate that a single dose of parstatin (1-41) can have a sustained effect.
- parstatin (1-41) did not have any effect on EGF or HB- EGF-induced DNA synthesis (Fig. 5B).
- mouse parstatin exhibited a significant, but less effective inhibitory effect. Scrambled parstatin and parstatin (24-41) did not cause any significant effect at concentration of 10 ⁇ , demonstrating specificity of the parstatin (1- 41) as anti-angiogenic agents.
- Example 7 Parstatin (1-41) inhibits signaling through the MAP kinase pathway
- the MAPK Erk1/2, p42/444 cascade mediates mitogenesis. Cell cycle progression has been shown to depend on sustained activation of the Erk signal transduction pathway. HUVEC cells were cultured in 35mm tissue culture dishes. After reaching 80% confluency, cells were growth factor-starved and subsequently stimulated for 10 min with vehicle or indicated agents. In combination experiments, cells were pretreated with parstatin or other peptides for 10 to 60 min.
- parstatin (1-41) Pretreatment of endothelial cells with parstatin (1-41) for 1 h inhibited the activation of Erk1/2 stimulated either by FBS, bFGF, or VEGF (Fig. 6A).
- the inhibitory effect was concentration-dependent (Fig. 6B).
- Parstatin (1-41) essentially blocked the bFGF- induced Erk1/2 phosphorylation levels from a concentration of 3 ⁇ parstatin (1-41). This inhibitory effect was observed at the shortest exposure times (Fig. 6C). For example, at 10min, the inhibition of Erk1/2 activation was about 50% of the maximum, indicating a time-dependent effect of parstatin (1-41).
- parstatin (1-41) was specific for bFGF or VEGF, since parstatin did not have any effect on EGF- or HB-EGF-induced Erk1/2 activation (Fig. 6E). These results may provide insight to the mechanism of action of parstatin (1-41) in the inhibition of cell proliferation and migration.
- Example 8 Parstatin (1-41)-mediated inhibition of endothelial cell growth is associated with induction of cell apoptosis as demonstrated by flow cytometry and cell staining.
- parstatin (1-41) increased the subG0/G1 cell fraction, which represents the percentage of apoptotic cells (Fig. 7A). In addition, parstatin (1-41) increased the cell fraction in G0/G1 phase, indicating that it induced endothelial cell cycle arrest (Fig. 7A). In agreement with results obtained in growth experiments, parstatin (1-41) reduced the percentages of cells in S and G2/ phases (Fig. 7A). Similar results were obtained when endothelial cells stimulated by growth factors, such as bFGF (Fig. 7A). These data demonstrate an inhibition of cell cycle progression by key angiogenic agonists.
- parstatin (1-41) in endothelial cell apoptosis was further explored using the Annexin V/propidium iodide based assay (Annexin V-FITC assay kit, BD Biosciences® PharMingen, Belgium), which is a valuable and very sensitive technique to detect apoptosis. Endothelial cells were grown until approximately 80% confluence. Cells were then treated in the absence or in the presence of human parstatin (1-41) for 24 h in serum-free medium containing either 0.5% BSA, VEGF, or bFGF.
- the broad spectrum caspase inhibitor Z-VAD-FMK (Z-Val-Ala-Asp(OCH 3 )-Fluoromethylketone) was used alone or in combination with parstatin (1-41) at a fixed 100 ⁇ concentration. Attached cells were pooled with suspended cells and resuspended in 100 ⁇ _ of the kit reaction buffer containing propidium iodide and Annexin V-FITC, according to the manufacturer's instructions. Cells were analyzed on FACS flow cytometer within 1 h after staining. Cells were analyzed for healthy cells (annexin V-and Pl-negative), early apoptotic cells (annexin V-positive, Pl-negative) and late apoptotic or dead cells (annexin V- and Pl-positive).
- parstatin (1-41) increased the percentages of endothelial cells in early and late apoptotic stages (Fig. 7B). In parallel, the percentage of healthy/viable cells was equally decreased (Fig. 7B). Parstatin (1-41) promoted cell apoptosis in all culture conditions used with the effect to be more pronounced in endothelial cells stimulated by bFGF or VEGF (Fig. 7B). The apoptotic effect of parstatin (1-41) was concentration-dependent and was reversed by caspase inhibitor Z-VAD-FMK, indicating that caspase activation was involved in parstatin-mediated the apoptotic cell death (Fig. 7C).
- Example 9- Parstatin (1-41) inhibits growth of endothelial cells is associated and induction of apoptosis as demonstrated by caspase activation and PARP cleavage.
- caspases 1-41 pro-apoptotic effect
- its effect on caspase-3 activation was examined using a commercially available kit (Promega, Madison, l).
- the colorimetric substrate, Ac-DEVD-p-nitroanilide is cleaved by caspase-3 to release yellow p-nitroanilide, was measured by absorbance at 405nm to detect caspase activation.
- HUVEC cells were grown in 60 mm tissue culture plates until approximately 80% confluency. Cells were treated in absence or in presence of 0.5% BSA or bFGF for 24 h in serum-free medium. Suspended and adherent cells were collected and lysed. Caspase-3 activity was measured by absorbance at 405nm.
- PARP Poly(ADP-ribose) polymerase
- Example 10- Parstatin (1-41 ) is a cell-penetrating peptide
- Parstatin (1-41) because of highly hydrophobic properties of its first 23 amino acids, may possess the ability to interact with cell membrane lipid bilayers and to penetrate inside the cells.
- human parstatin (1-41) was conjugated with FITC.
- FITC To measure the parstatin uptake into the endothelial cells, two methodological approaches were used: flow cytometry and fluorescence microscopy.
- HUVEC cells in the exponential growth phase were exposed to various concentrations of parstatin (1-41)-FITC in serum-free medium containing 0.5% BSA. After incubation times ranging from 1 min to 60 min, cells were washed extensively. Washed cells were incubated for 10 min with trypsin at 37°C to remove the cell surface-bound parstatin. Suspended cells-were subsequently centrifuged,-washed, and analyzed-on FACS flow cytometer (EPICS XL- CL; Coulter).
- the uptake of a given parstatin (1-41)-FITC into cells was assessed by the change of the FITC-positive cell population compared with untreated control cell samples.
- the fraction of FITC-positive cell population exposed to parstatin-FITC for 30 min was increased in a dose-dependent manner (Fig. 9A). Even at the shortest time of exposure to parstatin studied of 1 min the FITC-positive cell population was 13.4% and reached to maximal level after 30 min of treatment (Fig. 9B).
- FITC-labelled parstatin 1-41
- DAPI 6-Diamidino-2-phenylindole
- parstatin (1-41) possess the ability to interact with cell membranes and enter cells at a rate dependent on the exposure time and the concentration applied. They also suggest that parstatin peptides including the N- terminal sequence may be exceptionally useful and readily taken up in topical or local applications (e.g., intraocular injections for the treatment of retinal angiogenesis). This kinetic profile was in agreement with the initiation of parstatin-mediated biological effects (e.g. the inhibition of bFGF-induced MAPK activation). Taken together, these results provide evidence that parstatin (1-41) is a cell-penetrating peptide which exerts its biological effects intracellularly.
- parstatin (24-41) fragment conjugated with FITC.
- endothelial cells exposed to parstatin (24-41 )-FITC no fluorescence was observed (Fig. 9C), and the FITC-positive cell population was minimal and comparable with that of control cells (Fig. 9A).
- the inability of parstatin (24-41) to interact with and penetrate cell membranes provides a plausible explanation for the absence of cellular effects.
- the exposure of endothelial cells to FITC-labelled modulated parstatin which is scrambled at residues 24-41 , resulted in marked increase of the fraction of FITC- positive like that observed with FITC-parstatin (Fig. 9A).
- Example 11 Parstatin (1-41 ) and parstatin (1-26) and (24-41 ) fragments suppress choroidal neovascularization in mice
- Parstatin (1-41), hydrophobic parstatin (1-26) fragment and hydrophilic parstatin (24- 41 ) fragment were used in an in vivo mouse model of choroidal neovascularization.
- laser photocoagulation-induced rupture of Bruch's membrane was used to generate choroidal neovascularization as a preclinical disease model for age-related macular degeneration.
- Pathogen-free C57BL76J (4-5 week-old) mice were treated in accordance with the Association for Research in Vision and Ophthalmology Statement for the Use of Animals in Ophthalmic and Vision Research and the guidelines of the Animal Care and Use Committee at local University Medical School.
- Intraocular injections of parstatin peptides were performed with a Harvard pump microinjection apparatus and pulled glass micropipets. Under a dissecting microscope, the sharpened tip of a micropipette was passed through the sclera just behind the limbus into the vitreous cavity. Intravitreal injections of 1 ⁇ solutions of parstatin (1-41) or parstatin (24-41) in phosphate buffered saline (PBS) or PBS alone were administered. Also, intravitreal injections of ⁇ solutions of parstatin (1-26) in dimethyl sulphoxide (DMSO) or DMSO alone were administered. Intravitreal injections of parstatin peptides were administered immediately after laser treatment and 7 days after laser treatment. Choroidal neovascularization was assessed 14 days after laser treatment.
- choroidal neovascularization such as anti-VEGF, anti-VEGFR2 or anti-PIGF treatment.
- the dose of 30pg did not provide additional benefit (Fig. 10E).
- Mice treated with scrambled parstatin (10pg) had choroidal neovascularization similar to that obtained in control mice (Fig. 10D and E; p 0.6).
- Slit lamp examinations showed that all parstatin (1-41) doses were well tolerated with no signs of irritation, inflammation, or other ocular toxicity and no signs of systemic toxicity were seen.
- mice treated with parstatin (1-26) fragment had choriodal neovascularization significantly inhibited by 62%, at concentration of 10pg, compared to control mice treated with DMSO (Fig. 11 A).
- measurements of the area of choroidal neovascularization by image analysis confirmed that there was remarkably less neovascularization in eyes treated with parstatin (24-41) fragment, at concentration of 10 g, compared to control mice treated with PBS ( Figure 11 B).
- this inhibitory effect (77%) was superior to that obtained with parstatin (1-41) (59%) to the same experiments and concentration (10pg) (Fig. 1 1 B).
- parstatin (1-41) inhibited choroidal neovascularization in a dose-dependent manner, with most effective concentration at 10pg. This inhibitory effect was more evident and potent either after the administration of parstatin (1-26) fragment or parstatin (24-41) fragment. Again, the ability of parstatin peptides to function across species is noted. Human parstatin peptides potently inhibited choroidal neovascularization in mice tissue in a non-species specific manner.
- Example 12 Parstatin (1-41) and parstatin (1-26) and (24-41) fragments suppress retinal neovascularization in mice
- Parstatin (1-41), hydrophobic parstatin (1-26) fragment and hydrophilic parstatin (24- 41) fragment were used in an in vivo mouse model of retinal neovascularization.
- oxygen-induced retinopathy was used to generate retinal neovascularization as a preclinical disease model for retinopathy of prematurity and other retinal neovascular diseases such as diabetic retinopathy.
- exposing newborn mice to hyperoxia prompts regression or delay of retinal vascular development, followed by abnormal angiogenesis after their return to normal oxygen levels.
- this model mirrors the events-thai occuridurirrgTetinopathy of prematurity- when infants are removed- from oxygen-rieh incubators, a_ condition involving pathological neovascularization that can affect premature infants and result in permanent visual loss.
- this model has been extended to the general study of ischemic vasculopathies, such us diabetic retinopathy, and related antiangiogenic interventions, and it is now used extensively in both basic and applied research environments.
- mice were treated in accordance with the Association for Research in Vision and Ophthalmology Statement for the Use of Animals in Ophthalmic and Vision Research and the guidelines of the Animal Care and Use Committee at local University Medical School. Litters of 7-day old (P7) mice were exposed to an atmosphere of 75% oxygen in an airtight incubator for 5 days (PI 2), after which they were returned to room air for 5 days (P17).
- PI 2 airtight incubator for 5 days
- mice on P17 were given an intraocular injection of 1 ⁇ of rat anti-mouse platelet endothelial cell adhesion molecule-1 (PECAM-1) antibody (Pharmingen, San Jose, CA) under a dissecting microscope with Harvard pump microinjection apparatus.
- PECAM-1 rat anti-mouse platelet endothelial cell adhesion molecule-1
- mice were euthanized 12 hours after injection and eyes were fixed in PBS-buffered formalin for 5 hours. Retinas were dissected, washed and incubated with goat anti-rat polyclonal antibody conjugated with Alexa 488 or were labeled with griffonia simplicifolia-594 (Invitrogen, Carlsbad, CA) for 45 min. Both methods gave similar results. Retinal flat mounts were prepared and assessed with fluorescence microscope using imaging software. Intravitreal injections of 1 ⁇ solutions of parstatin (1-41) or parstatin (24-41) in phosphate buffered saline (PBS) or PBS alone were administered. Also, intravitreal injections of 1 ⁇ solutions of parstatin (1-26) in dimethyl sulphoxide (DMSO) or DMSO alone were administered on P12 (immediately after the mice are removed from hyperoxic conditions) and on P15.
- DMSO dimethyl sulphoxide
- mice with ischemic retinopathy were given intravitreal injections of PBS at P12 and P15, stained retinal flat mounts showed extensive areas of neovascularization (Fig. 12A, E).
- treatment of mice with increasing doses of parstatin (1-41) at P12 and P15 caused a dose-dependent inhibition of neovascularization on the surface of the retina (Fig. 12B, F and C, G).
- mice treated with parstatin (1-26) fragment had retinal neovascularization significantly inhibited by 65%, at concentration of 5pg, compared to control mice treated with DMSO (Fig. 13A).
- measurements of the area of retinal neovascularization by image analysis confirmed that there was remarkably less neovascularization in retinas treated with parstatin (24-41) fragment, at concentration of 5pg, compared to control mice treated with PBS ( Figure 13B).
- the inhibitory effect (69%) of parstatin (24-41) was superior to that obtained with parstatin (1-41) (57%) to the same experiments and concentration (5 g) (Fig. 13B).
- parstatin (1-41) inhibited retinal neovascularization in a dose-dependent manner, with most effective concentration at 3-5 g. This inhibitory effect was also evident and likely more potent either after the administration of parstatin (1-26) fragment or parstatin (24-41) fragment. Again, the ability of parstatin peptides to function across species is noted. Human parstatin peptides potently inhibited retinal neovascularization in mice tissue in a non-species specific manner.
- Parstatin (1-41), hydrophobic parstatin (1-26) fragment and hydrophilic parstatin (24- 41) fragment were used in an in vivo rat model of corneal neovascularization.
- chemical burn-induced corneal trauma was used to generate corneal neovascularization as a preclinical disease model simulating a plethora of corneal diseases associated with abnormaL formation of new blood vessels.
- the ⁇ cornea-is normally an avascular tissue that can be stimulated to undergo pathological neoangiogenesis in response to mechanical or chemical injuries, pterygium, herpetic keratitis, etc.
- an inflammatory response is considered an important prerequisite for neovascularization.
- This model is widely accepted and is one of the most extensively studied models, which provides an in vivo environment to study this complex process with convenient access to the corneal tissue and the highly visible developing vasculature.
- Pathogen-free male Sprague-Dawley rats 250-300gr were treated in accordance with the Association for Research in Vision and Ophthalmology Statement for the Use of Animals in Ophthalmic and Vision Research and the guidelines of the Animal Care and Use Committee at local University Medical School. Rats were anesthetized with intramuscular injection of ketamine (25 mg/Kg) and xylazine hydrochloride (10 mg/Kg). All eyes were examined to exclude any eyes with corneal scars or preexisting neovascularization. Corneas were cauterized by pressing an applicator stick coated with 75% silver nitrate and 25% potassium nitrate to the center of the corneas for 4 seconds, under a microscope.
- Injections were performed in the 12, and 6 o'clock positions 1 mm posterior to the limbus with a 30-gauge needle attached to a 1-mL tuberculin syringe under a microscope. Seven days later, each eye underwent slit-lamp examination and photographs of the cornea were taken with a digital camera (Nikon D2X) attached to a microscope.
- the corneal neovascularization was assessed using a semiautomatic program, which was developed in MATLAB 7.5. The program included conversion of the color image into a black-and-white image, selection of a threshold level that made possible the visualization of the corneal vessels and calculation of the corneal neovascularization (as a percentage of the number of pixels of the new vessels to the pixels of the total corneal area).
- The-total cornea area was outlinecL-with the innermost vessel of the limbal arcade used as the border. All calculations were made by a blinded observer.
- the rats were sacrificed (7 days) and the eyes were excised. All eyes were sectioned (4pm) and stained with hematoxylin-eosin. Two independent pathologists, in a blinded manner, evaluated the microvessel density and the inflammatory cell infiltration in each slide. Total corneal vascular vessels and neutrophils were counted at 200x in seven representative stained tissue sections for each eye, covering all cornea area and having a similar distance from the central bum. The time course -of corneal neovascularization following cauterization is highly reproducible and well characterized. In the first 24 h after the injury, the limbal vessels that surround the cornea appear slightly engorged.
- Rats treated with parstatin (1-26) fragment had corneal neovascularization significantly inhibited by 50%, at concentration of 2x50pg, compared to control mice treated with DMSO (Fig. 15A).
- measurements, of the area of cornea neovascularization by image analysis confirmed that there was. remarkably less neovascularization in corneas treated with parstatin (24-41) fragment (60%), at concentration of 2x50pg, compared to control mice treated with PBS ( Figure 15B).
- the inhibitory effects of parstatin (1-26) and (24-41) fragments were comparable to that obtained with parstatin (1-41), but were evident at lower concentrations.
- hematoxylin and eosin staining of corneas revealed that there was more cellularity and thickening in control animals (Fig. 16A and C) than in parstatin (1-41)-treated rats (Fig. 16B and D). All corneas in the control group showed large numbers of intrastromal blood vessels (Fig. 16A), while comparatively less corneal neovascularization infiltration was apparent in the corneal stroma following all parstatin (1-41) treatment regimens (Fig. 16B). Mean density of vascular vessels (32.14 ⁇ 1.73) was reduced by 57% (p ⁇ 0.001 ) with parstatin (1-41) administration (2x100 g) compared with the mean number of vascular vessels (74.3 ⁇ 3.52) in the control sections (Fig.
- parstatin (1-26) and (24-41) fragments were comparable to that obtained with parstatin (1-41), but were evident at lower concentrations. There was no sign of cytotoxicity in any of the treatment groups. Endothelial cells and epithelial layers exhibited no histological alteration other than some preparation artifacts.
- parstatin (1-41) the superior corneal transparency in the parstatin (1-41) group compared to the control group. This might suggest an additional inhibitory effect of parstatin on concomitant corneal scarring, possibly related to inhibition of inflammatory migration and invasion.
- the beneficial effect of parstatin (1-41) in this model might relate not only to direct anti- angiogenic effects of the peptide but to a potential anti-inflammatory effect.
- the parstatin (1-41) group (Fig. 16D) had markedly fewer infiltrated inflammatory cell (neutrophils) than did the control (Fig. 16C).
- the numbers of neutrophils were 6.9+0.57 cells/corneal section in the parstatin (1-41)-injected corneas (2x100pg) and 36.25 ⁇ 1.32 cells/corneal section in the PBS-injected controls corneas (Fig. 16F; p ⁇ 0.001).
- the inflammatory cells were 39+2.54 cells/corneal section (Fig. 16F).
- corneas treated with parstatin (1-26) fragment had corneal mean number of infiltrated neutrophils significantly inhibited by 71 %, at concentration of 2x50 g, compared to control mice treated with DMSO (Fig. 16F).
- Inflammatory leukocyte accumulation is a common feature of major ocular diseases. For instance, leukocytes have been shown to play a role in the pathogenesis of ischemic retinopathies.
- VEGF which is a potent chemoattractant for leukocytes, is increased in ischemic retina and is necessary for retinal neovascularization to occur.
- Parstatin (1-41), hydrophobic parstatin (1-26) fragment and hydrophilic parstatin (24- 41) fragment were used in an in vivo mice model of VEGF-induced retinal leukostasis.
- mice C57BU6J (4-5 week-old) mice were anesthetized with ketamine hydrochloride (100mg/kg body weight) and xylazine (4mg/Kg body weight) and the pupils were dilated with 1% tropicamide.
- Intravitreal injections of 1 ⁇ solutions of 10 ⁇ VEGF, which is the optimal concentration for promoting leukostasis, or parstatin (1-41) or parstatin (24-41) in phosphate buffered saline (PBS) or PBS alone or the combinations were administered.
- intravitreal injections of 1 ⁇ solutions of parstatin (1-26) in dimethyl sulphoxide (DMSO) or DMSO alone were administered to assess leukostasis.
- DMSO dimethyl sulphoxide
- Example 15-- Parstatin (1-41) attenuates myocardial ischemia-reperfusion injury in rats.
- Parstatin (1-41) was used in an in vivo rat model of cardiac ischemia and reperfusion, and in an in vitro isolated rat heart model of ischemia-reperfusion injury. Male Sprague Dawley rats at 8 weeks of age were used and treated in compliance with the "Guide for the Care and Use of Laboratory Animals" formulated by the National Research Council (USA), 1996.
- ligature was positioned around the left main coronary artery and threaded through a plastic snare to permit reversible occlusion of the coronary artery.
- Coronary occlusion was induced by clamping the snare onto the heart and reperfusion was achieved by releasing the snare.
- the coronary artery was re-occluded and the risk zone was delineated by perfusion of 0.5% Evans' blue into the aortic cannula.
- Hearts were sectioned and incubated in 1 % triphenyltetrazolium chloride in phosphate buffer for 15 min to define white necrotic tissue when fixed in 10% formalin for 24 h.
- AAR Area at risk
- infarct-to-risk rations were determined by computerized planimetry using J-lmage v.i.6 software (NIH, Bethesda, MA). Infarct size was 63 ⁇ 2% of the AAR in the control group (Fig. 18A). However, when parstatin (1-41) was injected 15 min prior to ligating the left coronary artery, a concentration-dependant reduction in infarct size was evident (fig. 18A). A significant change in infarct size was detected with the 5-15 pg/Kg doses with 10 Mg/Kg as the optimal dose.
- Example 16 Parstatin (1-41) attenuates myocardial ischemia-reperfusion injury in excised hearts by recruiting the Gi-protein activation pathway including P38MAPK, Erk1/2, nitric oxide (NOS), and K A T P channels.
- parstatin (1-41) Different concentrations of parstatin (1-41) were perfused 15 min prior to coronary occlusion until occlusion. Control hearts produced an infarct size of 51+3% of the area at risk (Fig. 19A). Continuous administration of parstatin (1-41) for 15 min immediately before ischemia resulted in a concentration-dependent reduction of infarct size (Fig. 19A). Parstatin (1-41) at 1 ⁇ led to the largest reduction in infarct size (18 ⁇ 3%), a 65% decrease. A picture representation of infarct in control versus parstatin (1-41) (IpM)-treated hearts is shown in Figure 19C. Parstatin (1-41) lost its efficacy when used at 10-fold higher or lower concentrations. Similarly, parstatin (1-41) increased recovery of LVDP in a concentration-dependent manner (Fig. 19B). Again, the optimal concentration was 1 ⁇ which produced a 23% recovery of LVDP (Fig. 19B).
- Rats were treated with pertussis toxin (PTX) 48 h before ischemia.
- PTX pertussis toxin
- parstatin (1-41) no longer was able to reduce4 infarct size or increase the recovery of LVDP after ischemia-reperfusion injury (Fig. 20A and B).
- Isolated hearts were pre-treating with SB203580 or PD98059, inhibitors of p38 MAPK and extracellular signal-regulated kinases 1/2 (Erk1/2), respectively, with or without parstatin (1-41) treatment.
- p38 MAPK inhibition only partially blocked the infarct sparing effects of parstatin (1-41) but yet completely abolished the recovery of LVDP associated with parstatin (1-41) treatment (Fig. 20C and D).
- the protective effects of parstatin (1-41) on both infarct size and recovery of LVDP were abolished by the pre-treatment of isolated hearts with PD98059, an Erk1/2 inhibitor (Fig: 20C and D).
- No difference in phosphorylated levels of p38 MAPK (Fig. 20E) was detected, but found that the phosphorylation of Erk1/2 was greatly enhanced in parstatin (1-41)- treated hearts at reperfusion when compared with control hearts (Fig. 20F).
- Isolated hearts were perfused with 1 H-[1 , 2, 4]oxadiazolo-[4, 3-a]quinoxalin-1-one (ODQ, 10 ⁇ ), a potent and specific soluble guanylyl cyclase (sGS) inhibitor, with or without parstatin (1-41) (1 ⁇ ) prior to ischemia.
- ODQ partially abolished reduction in infarct size caused by parstatin (1-41) but had no effect alone (Fig. 21 A).
- ODQ pletely reversed the recovery of LVDP resulting from parstatin (1-41) treatment . 21 B).
- Example 17 Parstatin (1-41) causes endothelium-dependent coronary vasodilation.
- parstatin (1-41) did not have inotropic or chronotropic effects before ischemia.
- it also increased coronary flow during and after ischemia (Fig 22A).
- Fig 22A To investigate whether the increase in coronary flow was due to parstatin (1-41)-specific vasoactivity, isolated rat hearts were perfused under constant-flow conditions with or without parstatin (1-41) (1 ⁇ ) and subjected to ischemia-reperfusion.
- the ischemia-reperfusion insult in control hearts increased the coronary perfusion pressure by 142 ⁇ 3% during regional ischemia-reperfusion when compared with pre-ischemic values (Fig. 22B).
- Parstatin (1-41) limited this increase to 114+4% pre-ischemic values.
- parstatin (1- 41) limited the infarct size to 26 ⁇ 2% area at risk (vs. 43 ⁇ 2% control) and increased the recovery of post ischemic function to 75 ⁇ 6% (vs. 56+5% control) of preischemic LVDP
- microvessel studies were performed by in vitro organ bath videomicroscopy. Coronary arterioles (50-180 ⁇ internal diameters were dissected from the PV free wall tissue of the isolated rat hearts after excision.
- the vessels were pre-constricted to ⁇ 50% of its maximal diameter with endothelin-1 (10-100nM) Endothelium-independent/-dependent relaxation to parstatin (1 -41) (1-1000 nM) was examined in the presence or absence of inhibitors: L-NMA, ODQ and glibenclamide.
- a single dose of papaverine 200 ⁇ was added to determine the maximal internal diameter for normalization of dilator responses.
- Denuded vessels were obtained by passing a hair through the vessels several times followed by injection of 0.3ml_ of air. All values are expressed as a percentage of the maximum dilation to papaverine from the initially constricted diameter.
- parstatin (1-41 ) Increased doses of parstatin (1-41 ) resulted in a modest and incremental but potent dilation with an ED 5 o in the nanomolar range (Fig. 22C).
- Parstatin (1-41 )-induced vasodilation was abolished by pre-treatment of the vessels with L-NMA and reduced significantly with glibenclamide (Fig. 22C).
- ODQ did not significantly reduce vasodilation but the combination of ODQ and glibenclamide resulted in an additive effect to prevent parstatin (1 -41 )-mediated vasodilation.
- parstatin (1 -41 ) is an effective agent for cardioprotection during ischemia-reperfusion of the rat myocardium. It was also demonstrated that parstatin causes vasodilation in isolated rat coronary arterioles. Both cardioprotection and vasodilation properties of parstatin (1-41 ) is largely dependent on NOS and to a lesser extent on sGC and K A TP channels. Since the cardioprotective effects of the parstatin (1-26) occurred in the absence of heamodynamic changes, there is an exciting opportunity to develop parstatin (1 -26) to protect against myocardial and microvascular injury in the clinical setting.
- N-terminal hydrophobic parstatin (1-26) fragment was assayed in an in vivo rat model of myocardial ischemia-reperfusion injury.
- Male Sprague Dawley rats at 8 weeks of age were used and treated in compliance with the "Guide for the Care and Use of Laboratory Animals" published by the US National Institutes of Health (NIH Publication NO. 85-23, revised 1996).
- rats were anesthetized with pentobarbital sodium (50 mg/Kg) and heparin (1000 lU/Kg) and underwent 30 min of regional ischemia followed by 120 min of reperfusion.
- Ischemia was induced by placement of a ligature around the left main coronary artery which was threaded through a plastic snare to permit reversible occlusion of the coronary artery.
- Coronary occlusion was induced by clamping the snare onto the heart and reperfusion was achieved by releasing the snare.
- the coronary artery was re-occluded and the risk zone was delineated by perfusion 0.5% Evans' blue into the aortic cannula.
- Hearts were sectioned and incubated in 1 % triphenyltetrazolium chloride in phosphate buffer for 15 min to define white necrotic tissue when fixed in 10% formalin for 24 h.
- Area at risk (AAR) and infarct-to-risk rations were determined by computerized planimetry using J-lmage v.i.6 software (NIH, Bethesda, MA). The principal endpoint of these studies was infarct size expressed as a percentage of the area at risk.
- parstatin (1-26) fragment is more potent than parstatin (1-41) and is useful for both prophylaxis and treatment of myocardial ischemia/reperfusion injury.
- Example 19 The cardioprotective properties of the hydrophobic parstatin (1-26) fragment are largely dependant upon a Gj protein mediated pathway and involve the activation of Akt, nitric oxide synthase (NOS), soluble guanylyl cyclase (sGC) and K * ATP channels.
- Akt nitric oxide synthase
- NOS nitric oxide synthase
- sGC soluble guanylyl cyclase
- K * ATP channels K * ATP channels
- Preconditioning refers to the phenomenon by which the heart is put into a state of self- preservation. This is of therapeutic importance considering the high mortality and morbidity of ischemic heart diseases. Preconditioning is triggered by either brief cycles of ischemia or by exogenous agents, which typically activate G, protein coupled surface receptors to set off a complex pathway which ultimately results in cell survival (Schultz et a!., 1998, Am J Physiol., 275: H495-H500). G, proteins are able to activate components of the reperfusion injury salvage kinase pathway including PI3K/Akt and ERK1/2 (Hausenloy and Yellon, 2006, Cardiovasc Res., 70: 240-253).
- Akt is pivotal in the reperfusion injury salvage kinase pathway either by inactivation of the apoptotic pathway, for instance preventing the activation and translocation of BAX to the mitochondrial membrane or by activating endothelial NOS to increase production of NO (Cantley, 2002, Science, 296: 1655-1657).
- Nitric oxide subsequently targets sGC which results in the conversion of guanosine-5'-triphophate to the intracellular second messenger cyclic guanosine monophosphate (cGMP).
- K + ATP channels are opened in a cGMP-dependent manner (Oldenburg et al., 2004, Am J Physiol Heart Circ Physiol., 286: H468-H476; Qin et al., 2004, Am J Physiol Heart Circ Physiol., 287: H712-H718 ). Therefore, PI3K/Akt signaling may recruit multiple cardioprotective pathways to reduce myocardial damage after ischemia and reperfusion.
- parstatin a potent inhibitor of Gj proteins
- rats were treated with pertussis toxin (25pg/Kg, a potent inhibitor of Gj proteins) 48 hours prior to ischemia.
- the rats were then treated with or without parstatin (1-26) (1 pg/Kg) 15 min prior the ischemia.
- Rats were then subject to 30 min ischemia and 120 min reperfusion.
- pertussis toxin parstatin (1-26) was unable to reduce infarct size after ischemia-reperfusion injury (Fig. 24A).
- parstatin (1-26) was mediated through the PI3K/Akt pathway.
- rats were treated with wortmannin (I5pg/Kg, a potent and specific PI3K inhibitor) alone or in combination with parstatin fragment 1-26 (1pg/Kg).
- Wortmannin abrogated the cardioprotective effects of parstatin (1-26) (Fig. 24B).
- the left ventricular free wall tissue was homogenized and immunoblot analysis was performed using an anti-phospho-Akt (Ser473) primary antibody (Cell Signaling Technology, Danvers, MA).
- Pre-ischemic treatment of parstatin (1-26) increased phosphorylation of Akt/Ser473 after 5 min reperfusion when compared to hearts from control rats (Fig. 24C and D).
- Co-treatment with wortmannin blocked parstastin (1-26)-mediated Akt phosphorylation (Fig. 24C).
- parstatin (1-26) protects the heart by a mechanism involving nitric oxide synthase (NOS)
- rats were treated with L-NMA (15pg/Kg, a general NOS inhibitor), with or without parstatin (1-26) (1pg/Kg) prior to ischemia.
- L-NMA abolished the infarct sparing effect of parstatin (1-26), while L-NMA alone was without effect (Fig. 25A).
- the role of parstatin (1-26) in endothelial NOS activation was further evaluated by measuring the phosphorylation of Ser1177.
- the left ventricular free wall tissue was homogenized and immunoblot analysis was performed using an anti-phospho-endothelial NOS (Ser1177) primary antibody (Cell Signaling Technology, Danvers, MA).
- Parstatin (1-26) treatment increased endothelial NOS phosphorylation after 5 min reperfusion (Fig.25B).
- Wortmannin blocked parstatin (1- 26) - stimulated Ser1177 phosphorylation, suggesting that Akt participates in Ser1177-stimulated endothelial NOS activation (Fig. 25B and C).
- nitrite and nitrate content a marker of endothelial NOS activity, was measured from both ischemic and non-ischemic tissues.
- parstatin (1-26) protects the heart by a mechanism involving soluble guanylyl cyclase (sGC)
- rats were treated with ODQ (1mg/kg, a sGC inhibitor) with or without parstatin (1-26) (1pg/kg) prior to ischemia.
- ODQ abolished the reduction in infarct size caused by parstatin (1-26), but had no effect alone (Fig. 26A).
- Tissue accumulation of cGMP was measured after 120 min reperfusion from ischemic and non-ischemic myocardium. In these experiments, the cGMP was measured in the rat hearts by specific ELISA kits according to the manufacturer's instructions (Cayman Chemical, Ann Arbor, Ml).
- Frozen myocardial tissue samples in liquid nitrogen were ground to_a fine powder in a stainless-steel mortar.
- Frozen tissue was dropped into 5-10 volumes (ml of solution/gram of tissue) of 5% trichloroacetic acid (TCA) in water.
- TCA trichloroacetic acid
- the samples were homogenized on ice (0-40°C) using a polytron-type homogenizer. Centrifugation was at 30,000 r.p.m. at room temperature and the supernatant was collected for quantitative immunoassay of cGMP.
- the rats were treated with the cmPTP channel opener atractyloside (3 mg/Kg) with or without parstatin (1-26).
- Atractyloside pre-ischemic treatment led to the partial blockage of cardioprotection mediated by parstatin (1-26) (Fig. 27B) and had no effect alone.
- parstatin (1-26) is a very potent agent (more effective than parstatin (1-41)) for cardioprotection during ischemia and reperfusion of the rat myocardium.
- the cardioprotective properties of parstatin (1-26) largely depend on Akt, NOS, sGC, K A TP channels and mPTP.
- Example 20 Parstatin (1-41) protects from acute renal injury in a rat model of ischemia and reperfusion-induced nephropathy.
- Rats were anesthetized with intramuscular injection of ketamine (25 mg/Kg) and xylazine hydrochloride (10 mg/Kg). After a midline laparotomy, the renal pedicles were identified and bilaterally occluded for a period of 45 min using nontraumatic microaneurysm clamps. The presence of ischemia was visually confirmed by observing blanching of the kidneys. Sham- operated rats were subjected to identical surgical procedures without causing renal ischemia by application of microaneurysm clamps. At the end of ischemia period the clamps were removed and renal reperfusion was established. All rats were killed 4 hours after the initiation of reperfusion. Parstatin (1-41) was administered intravenously over 1 min starting 15 min prior to ischemia (renal l/R), and 10 seconds after the onset of reperfusion (renal l/R after) in a separate series of experiments.
- ketamine 25 mg/Kg
- xylazine hydrochloride 10 mg
- Urine was collected during reperfusion, and at the end of the experiments blood samples were taken and analyzed for biochemical markers of renal impairment. Serum creatinine levels were measured as an indicator of glomerular function. Urine concentrations of Na + were determined and used in conjunction with serum Na + concentrations to estimate FENa which was used as a sensitive indicator of tubular function.
- rat kidneys were removed 4 hours after reperfusion, fixed in 10% formalin, embedded in- paraffin, sectioned (5- ⁇ thicknesses), and stained with haematoxylin and eosin.
- Tubular injury was identified by the presence of any of flattened tubular cells, loss of brush border, and cast formation.
- Ten high-powered fields (hpf's; x 400 magnification) from the outer medulla and corticomedullary junction were examined from each animal to determine the percentage of tubules showing evidence of injury and scored according to the following scale: 0, no injury; 1 , less than 10%; 2, 10% to 25%; 3, 26% to 75%; 4, greater than 75%.
- the 10 scores were averaged to give the tubular injury score for each specimen.
- Fig. 28A and B Compared to sham- operated animals, rats which were subjected to renal ischemia and reperfusion exhibited a significant increase in both serum creatinine concentrations and FENa (Fig. 28A and B), suggesting a significant degree of glomerular and tubular dysfunction, respectively.
- Pre-treatment of rats (15 min prior to ischemia) with parstatin (1-41) produced significant reductions in both serum levels of creatinine (Fig. 28A) and FENa (Fig. 28B).
- the renal protective effects of parstatin (1- 41) were dose-dependant with an optimal dose at 30 g/Kg. At this dose, parstatin (1- 41) reduced ischemia and reperfusion-induced levels of serum of creatinine and FENa by 22.5% and 63%, respectively.
- parstatin (1-41) (30pg/Kg) to sham- operated rats did not result in any alteration in biochemical markers as compared with sham-treated animals administered saline only (Fig. 28A and B).
- the administration of parstatin (1-41) 10 seconds after initiation of reperfusion resulted in 23.3% and 58% reduction of serum of creatinine and FENa, respectively (Fig. 28A and B).
- Rats treated with scrambled parstatin (30pg/Kg) had serum of creatinine and FENa levels similar to that obtained in control rats treated with PBS (Fig. 28A and B).
- Fig. 28C When compared to the histological score measured from kidneys obtain from sham- operated animals, renal ischemia/reperfusion produced a significant increase in histological score, suggesting marked renal injury caused by ischemia/reperfusion (Fig. 28C). Rats which were subjected to renal ischemia/reperfusion demonstrated the characteristic histological features of renal injury such as tubular degeneration and dilation, luminal congestion and eosinophilia. In contrast, histological scoring of renal injury was significantly reduced by administration of parstatin (1-41) (30 g/Kg) (Fig. 28C).
- Example 21 Parstatin (1-26) protects from acute renal injury in a rat model of ischemia and reperfusion-induced nephropathy.
- a dose response analysis (1-100pg/Kg) using the hydrophobic parstatin (1-26) fragment was performed to determine its optimal renal protective dose and compared it to the optimal protective dose of parstatin (1-41) (30pg/Kg).
- parstatin (1-41) (30pg/Kg).
- Figure 29A and B significant and dose-dependent reductions in biochemical markers were detected with the 1 and 10 pg/Kg doses of parstatin (1-26).
- serum of creatinine and FENa were reduced by 27% and 66%, respectively.
- Pre-ischemic treatment with parstatin (1-41) reduced serum creatinine and FENa by 20% and 61%, respectively (Fig. 29A and B).
- parstatin (1-26) 10 seconds after initiation of reperfusion resulted in 30% and 72% reduction of serum of creatinine and FENa, respectively ( Figures 29A and B). Accordingly, histological scoring of renal injury was marked reduced by administration of parstatin (1-26) fragment (Fig. 29C).
- Rats which were subjected to renal ischemia/reperfusion demonstrated the characteristic histological features of renal injury such as tubular degeneration and dilation, luminal congestion and eosinophilia.
- histological scoring of renal injury was significantly reduced by administration of parstatin (1-26) (10pg/Kg) (Fig. 29C). Specifically, although some tubular dilation and luminal congestion were still apparent in kidney sections from rat pre-treated with parstatin (1-41) prior to renal ischemia-reperfusion, tubular degeneration was significantly reduced.
- parstatin (1-26) is more potent than parstatin (1-41) and may be useful for both prophylaxis and treatment of renal failure and injury caused by ischemia and reperfusion.
- Example 22 Parstatin (1-41) protects from acute renal injury in a rabbit model of contrast-induced nephropathy
- Contrast agents for radiographic, ultrasound, or computed tomographic imaging procedures are relatively nontoxic compared to most foreign substances injected into the body but, like all foreign compounds, show a certain toxicity in high concentrations, which can occasionally be life-threatening to the patient. This toxicity can be predicted by use of certain animal models.
- This model has been designed to detect pathologic indications of acute renal toxicity.
- a high dose of a contrast agent was injected intravenously into rabbit and kidney function and survival were monitored " after 48 h and 7 days.
- the rabbit was chosen because its renal function was demonstrated to be sensitive to contrast agents and comparative studies have also suggested that it is more sensitive to contrast agents than the rat.
- the dose given in this model was 10 grams of iodine per kilogram of body weight
- Rabbits were anesthetized with intramuscular injection of ketamine (25 mg/Kg) and xylazine hydrochloride (10 mg/Kg). Contrast-induced nephropathy was experimentally induced in rabbits by intravenous administration of a high dose of iodinated contrast medium. The animals were weighted and a cannula was placed in the marginal ear vein for administration of the contrast agent. A dose of 10 g I/Kg lopromide (ULTRAVIST, 370 mg l/ml, Bayer Schering Pharma) was infused over 30 min. Rabbits were randomized between two groups.
- ketamine 25 mg/Kg
- xylazine hydrochloride 10 mg/Kg
- Blood serum creatinine and urea were measured after 48 hours in all subjects in both groups.
- a threshold of 1.5 mg/dl of serum creatinine was set for diagnosis of acute renal failure. Normal serum creatinine in healthy rabbits is 0.7-0.9 mg/dl.
- parstatin (1-41) may have potential as a new therapeutic approach to prevent contrast-induced nephropathy given its ability to preserve renal function and protect renal tissue.
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US8227412B2 (en) * | 2007-03-29 | 2012-07-24 | Tsopanoglou Nikos E | Bioactive parstatin peptides and methods of use |
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- 2010-08-05 CA CA2776778A patent/CA2776778A1/en not_active Abandoned
- 2010-08-05 WO PCT/IB2010/002142 patent/WO2011039584A2/en active Application Filing
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WO2014007547A1 (en) * | 2012-07-03 | 2014-01-09 | Il Yang Pharm. Co.,Ltd. | Novel peptides and use thereof |
US9403874B2 (en) | 2012-07-03 | 2016-08-02 | Samsung Life Public Welfare Foundation | Peptides and use thereof |
WO2015173802A1 (en) * | 2014-05-11 | 2015-11-19 | Tel Hashomer Medical Research Infrastructure And Services Ltd. | Par-1 based therapeutic conjugates and uses thereof |
EP3143036A4 (en) * | 2014-05-11 | 2018-02-28 | Tel Hashomer Medical Research Infrastructure and Services Ltd. | Par-1 based therapeutic conjugates and uses thereof |
Also Published As
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AU2010302383B2 (en) | 2015-02-12 |
AU2010302383A1 (en) | 2012-04-26 |
CA2776778A1 (en) | 2011-04-07 |
EP2483302A2 (en) | 2012-08-08 |
WO2011039584A3 (en) | 2011-05-26 |
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