WO2002014487A2 - Adeno-associated virus-mediated delivery of angiogenic factors - Google Patents
Adeno-associated virus-mediated delivery of angiogenic factors Download PDFInfo
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- WO2002014487A2 WO2002014487A2 PCT/IB2001/001902 IB0101902W WO0214487A2 WO 2002014487 A2 WO2002014487 A2 WO 2002014487A2 IB 0101902 W IB0101902 W IB 0101902W WO 0214487 A2 WO0214487 A2 WO 0214487A2
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Definitions
- the present invention relates to delivery of recombinant adeno-associated virus virions to muscle tissue. More specifically, the invention relates to the delivery of rAAV virions containing a transgene coding for an angiogenic factor to ischemic and non-ischemic muscle. The invention also relates to treating ischemic disease.
- Coronary artery disease is the most common cause of heart failure in the Western world. In the United States, some 7 million people suffer from the affliction, with over 500,000 people dying from it each year, making coronary artery disease the number one killer of men and women in America. In addition, approximately 700,000 more Americans experience non-fatal heart attacks, with significant morbidity a common clinical outcome, as irreparable cardiac damage often ensues. This damage to cardiac tissue is caused by ischemia. Myocardial ischemia occurs when the cardiac muscle fails to receive an adequate blood supply and is thus deprived of essential levels of oxygen and nutrients.
- cardiac tissue necrosis will occur; that is, a myocardial infarct will develop, and if severe enough, lead to cardiac arrest.
- myocardial ischemia atherosclerosis
- the most frequent cause of myocardial ischemia, atherosclerosis results from a narrowing and hardening ofthe coronary arteries that provide blood flow to the cardiac muscle. The narrowing and hardening can become sufficiently relentless to completely block the affected artery.
- Other factors known to cause coronary arterial occlusion include thromboembolisms (in the absence of atherosclerosis) and congenital anatomical abnormalities.
- Non-surgical endovascular techniques e.g., percutaneous transluminal angioplasty, endovascular stents.
- Standard pharmacological therapy is predicated on strategies that involve either increasing blood supply to the cardiac muscle or decreasing the demand ofthe cardiac muscle for oxygen and nutrients.
- Surgical treatment of ischemic heart disease is based on the bypass of diseased arterial segments with strategically placed bypass grafts.
- Non-surgical endovascular techniques are based on the use of catheters or stents to reduce the narrowing in diseased coronary arteries. All of these strategies are used to decrease the number of, or to eliminate, ischemic episodes, but all have various limitations.
- ischemia may occur in the brain, peripheral limbs, lungs, and kidneys, leading to stroke, deep vein thrombosis, pulmonary embolus, and renal failure.
- Peripheral arterial disease i.e., non-myocardial ischemia
- peripheral neuropathies where the sensory and motor neurons are adversely affected.
- the prognosis of patients with these risk factors is limited because of their greater risks for myocardial infarction, stroke, and cardiovascular death. Often it is necessary to treat both peripheral and myocardial ischemia together.
- angiogenesis or the proliferation of new capillary blood vessels, is a fundamental process necessary for the normal growth and development of tissues. It is a requirement for the development and differentiation ofthe vascular tree, as well as for a wide variety of other physiological processes. Among these, angiogenesis occurs as part ofthe body's repair mechanisms, e.g., in the healing of wounds. Capillary blood vessels consist of endothelial cells and pericytes. These two cell types carry the requisite genetic information to form tubes, branches and entire capillary networks. Specific molecules can initiate this process. In view ofthe physiological importance of angiogenesis, much effort has been devoted to the isolation, characterization and purification of factors that can stimulate angiogenesis, and a number of polypeptides that do so have been purified and characterized.
- VEGF vascular endothelial growth factor
- VEGF vascular endothelial growth factor
- VEGF is a potent vasoactive protein.
- the 165 amino acid variant is the predominant molecular form found in normal cells and tissues.
- a less abundant, shorter form with a deletion of 44 amino acids between positions 116 and 159 (VEGF ) a longer form with an insertion of 24 basic residues in position 116 (VEGFiss , n d another longer form with an insertion of 41 amino acids (VEGF 20 ⁇ ), which includes the 24 amino acid insertion found in VEGF ⁇ 8 9, are also known.
- VEGFm and VEGF ⁇ 6 5 are soluble proteins.
- VEGF ⁇ 8 9 and VEGF 20 ⁇ appear to be mostly cell-associated. All ofthe versions of VEGF are biologically active.
- VEGF various forms of VEGF are encoded by the same gene and arise from alternative splicing of messenger RNA. This conclusion is supported by Southern blot analysis of human genomic DNA, which shows that the restriction pattern is identical using either a probe for VEGF 1 65 or one that contains the insertion in VEGF 2 o6- Analysis of genomic clones in the area of putative mRNA splicing also shows an intron/exon structure consistent with alternative splicing. Recently, a new isoform of VEGF, called VEGF-2, has been described. Its expression profile is similar to VEGF, and has been shown to stimulate the proliferation of vascular endothelial cells, while inhibiting the proliferation-stimulating effect on vascular smooth muscle cells elicited by platelet-derived growth factor.
- VEGF can have diverse effects that depend on the specific biological context in which it is found.
- VEGF is a potent endothelial cell mitogen and directly contributes to induction of angiogenesis in vivo by promoting endothelial cell proliferation during normal development or during wound healing.
- a most striking property of VEGF is its specificity.
- VEGF vascular endothelial growth factor
- VEGF By binding to its receptor (an endothelial cell-surface tyrosine kinase receptor), VEGF can trigger the entire sequence of events leading to angiogenesis and has been shown to stimulate capillary growth in various animal models of ischemia. It is able to stimulate the proliferation of endothelial cells isolated from both small and large vessels. VEGF expression is triggered by hypoxemia so that endothelial cell proliferation and angiogenesis appear to be especially stimulated in ischemic areas.
- receptor an endothelial cell-surface tyrosine kinase receptor
- FGF fibroblast growth factor
- FGF-1 alternatively termed acidic FGF
- FGF-9 fibroblast growth factor
- FGF-2 also known as basic FGF
- FGF-2 is one ofthe most extensively characterized proteins in the angiogenic process. For example, studies have shown that an injection of FGF-2 into adult canine coronary arteries during coronary occlusion leads to an increase in new blood vessel formation, reportedly leading to a decrease in myocardial dysfunction. Similar results have been reported in other animal models of myocardial ischemia.
- FGF-2 has been shown to have a synergistic effect with VEGF to induce endothelial cell proliferation into capillary-like structures.
- FGF-2 along with VEGF, has been shown to induce angiogenesis.
- the FGF receptor is similar to the VEGF receptor in that it is a cell-surface tyrosine kinase receptor. Ligand binding activates the receptor by inducing a conformational change resulting in the triggering ofthe intrinsic tyrosine kinase activity, which leads to a signal transduction cascade that affects gene expression and ultimately results in endothelial cell proliferation.
- Angiopoietin-1 a recently discovered angiogenic factor, was first identified by its involvement in the later stages of angiogenesis. For example, studies have shown that, when VEGF and angiopoietin-1 are introduced into an angiogenic assay together, larger, more numerous, and more highly branched vessels formed relative to VEGF treatment alone. Another study showed that angiopoietin-1 induced endothelial cell proliferation and capillary growth in the absence of VEGF, and that these new blood vessels were not "leaky,” unlike VEGF, which induced the formation of new blood vessels growth that were leaky. The same study demonstrated that coexpression of VEGF and angiopoietin-1 led to an additive effect of new blood vessel formation, and that these new blood vessels were not leaky.
- a nucleic acid molecule can be introduced directly into a patient (in vivo gene therapy), or into cells isolated from a patient or a donor, which are then subsequently returned to the patient (ex vivo gene therapy). The introduced nucleic acid then directs the patient's own cells or grafted cells to produce the desired therapeutic product. Gene therapy may also allow clinicians to select specific organs or cellular targets (e.g., muscle, blood cells, brain cells, etc.) for therapy.
- organs or cellular targets e.g., muscle, blood cells, brain cells, etc.
- Nucleic acids may be introduced into a patient's cells in several ways, including viral-mediated gene delivery, naked DNA delivery, and transfection methods.
- Viral-mediated gene delivery has been used in a majority of gene therapy trials.
- the recombinant viruses most commonly used in gene therapy trials are those based on retrovirus, adenovirus, herpes virus, pox virus, and adeno-associated virus (AAV).
- transfection methods may be used for gene delivery. Although transfection methods are generally not suitable for in vivo gene delivery, they may be utilized for ex vivo gene transfer. Such methods include chemical transfection methods, such as calcium phosphate precipitation and liposome-mediated transfection, as well as physical transfection methods such as electroporation.
- AAV a parvovirus belonging to the genus Dependovirus
- AAV has several features not found in other viruses. These features make it particularly well suited for gene therapy applications. For example, AAV can infect a wide range of host cells, including non-dividing cells. Furthermore, AAV can infect cells from a variety of species. Importantly, AAV has not been associated with any human or animal disease, and does not appear to alter the physiological properties ofthe host cell upon transduction. Finally, AAV is stable at a wide range of physical and chemical conditions, which lends itself to production, storage, and transportation requirements.
- the AAV genome a linear, single-stranded DNA molecule containing approximately 4700 nucleotides (the AAV-2 genome consists of 4681 nucleotides, the AAV-4 genome 4767), generally comprises an internal non-repeating segment flanked on each end by inverted terminal repeats (ITRs).
- ITRs are approximately 145 nucleotides in length (AAV-1 has ITRs of 143 nucleotides) and have multiple functions, including serving as origins of replication, and as packaging signals for the viral genome.
- the internal non-repeated portion ofthe genome includes two large open reading frames (ORFs), known as the AAV replication (rep) and capsid (cap) regions. These ORFs encode replication and capsid gene products, which allow for the replication, assembly, and packaging of a complete AAV virion. More specifically, a family of at least four viral proteins are expressed from the AAV rep region: Rep 78, Rep 68, Rep 52, and Rep 40, all of which are named for their apparent molecular weights. The AAV cap region encodes at least three proteins: VP1, VP2, and VP3.
- AAV is a helper-dependent virus, that is, it requires co-infection with a helper virus (e.g., adenovirus, herpesvirus, or vaccinia virus) in order to form functionally complete AAV virions.
- a helper virus e.g., adenovirus, herpesvirus, or vaccinia virus
- AAV establishes a latent state in which the viral genome inserts into a host cell chromosome or exists in an episomal form, but infectious virions are not produced.
- Subsequent infection by a helper virus "rescues" the integrated genome, allowing it to be replicated and packaged into viral capsids, thereby reconstituting the infectious virion.
- the helper virus must be of the same species as the host cell.
- human AAV will replicate in canine cells that have been co-infected with a canine adenovirus.
- a suitable host cell line can be transfected with an AAV vector containing the heterologous nucleic acid sequence, but lacking the AAV helper function genes, rep and cap.
- the AAV-helper function genes can then be provided on a separate vector.
- the helper virus genes necessary for AAV production i.e., the accessory function genes
- AAV helper functions can be incorporated into a helper virus genome, preferably one that has been made replication-incompetent.
- AAV cap can be incorporated into an adenoviral genome such as adenovirus serotype 5, and the adenovirus can then infect host cells and provide the Cap protein helper function as well as the necessary helper virus accessory functions.
- the AAV helper function genes i.e., rep and cap
- accessory function genes can be provided on one or more vectors. Helper and accessory function gene products can then be expressed in the host cell where they will act in trans on rAAV vectors containing the heterologous nucleic acid sequence. The rAAV vector containing the heterologous nucleic acid sequence will then be replicated and packaged as though it were a wild-type (wt) AAV genome, forming a recombinant virion.
- the heterologous nucleic acid sequence enters and is expressed in the patient's cells. Because the patient's cells lack the rep and cap genes, as well as the accessory function genes, the rAAV cannot further replicate and package their genomes. Moreover, without a source of rep and cap genes, wtAAV cannot be formed in the patient's cells.
- AAV-2 is the most prevalent serotype in human populations; one study estimated that at least 80% of the general population has been infected with wtAAV-2.
- AAV-3 and AAV-5 are also prevalent in human populations, with infection rates of up to 60%.
- AAV-1 and AAV-4 are simian isolates, although both serotypes can transduce human cells.
- AAV-2 is the best characterized. For instance, AAV-2 has been used in a broad array of in vivo transduction experiments, and has been shown to transduce many different tissue types. Investigators have exploited the broad tissue tropism of AAV-2 to deliver many different tissue-specific transgenes.
- methods and vectors for use are provided which allow for the efficient transfer of genes to muscle tissue using recombinant AAV virions.
- the methods result in the long-term and stable expression ofthe genes transferred.
- the invention broadly encompasses the use of rAAV virions, free of wt-AAV and adenovirus (or other helper viruses), to deliver genes encoding angiogenic factors to muscle tissue in order to produce a therapeutic effect, h one embodiment ofthe present invention, the angiogenic factor is VEGF. In a preferred embodiment, the VEGF is VEGF 165 . In another embodiment, the angiogenic factor is FGF. In yet another embodiment, the angiogenic factor is angiopoietin-1.
- the therapeutic effect in one aspect ofthe invention, is an increase in new blood vessel formation. In another aspect, the therapeutic effect is an increase in blood flow.
- rAAV virion delivery is by way of direct injection into muscle tissue.
- the muscle tissue is skeletal muscle tissue.
- the muscle tissue is cardiac muscle tissue.
- the muscle tissue is smooth muscle tissue.
- rAAV virion delivery is by way of a catheter inserted into a blood vessel that supplies the muscle with blood.
- the muscle is a skeletal muscle.
- the muscle is a cardiac muscle.
- the muscle is a smooth muscle.
- the invention also discloses methods for treating ischemic disease.
- rAAV virions free of wt-AAV and helper viruses and containing a gene coding for an angiogenic factor, are delivered to muscle tissue where the gene is expressed and a therapeutic effect is achieved.
- the angiogenic factor is VEGF, preferably VEGFies-
- the angiogenic factor is FGF.
- the angiogenic factor is angiopoietin-1.
- the therapeutic effect in one aspect, is an increase in new blood vessel formation. In another aspect, the therapeutic effect is an increase in blood flow to the ischemic muscle tissue.
- treating ischemia in a muscle is by way of direct injection of rAAV virions, containing a gene coding for an angiogenic factor, into the muscle experiencing ischemia.
- the muscle is a skeletal muscle.
- the muscle is a cardiac muscle.
- the muscle is a smooth muscle.
- treating ischemia in a muscle is by way of catheter delivery of rAAV virions, wherein the rAAV virions contain a gene encoding an angiogenic factor, whereby the catheter is inserted into a blood vessel that supplies the muscle with blood.
- the catheter is inserted directly into a blood vessel that supplies the ischemic muscle with blood, and rAAV virion injection occurs there.
- the catheter is inserted into a peripheral blood vessel and is then advanced via the vascular system to a blood vessel supplying the ischemic muscle with blood, where rAAV virion injection occurs.
- the muscle is a skeletal muscle.
- the muscle is a cardiac muscle.
- the muscle is a smooth muscle.
- FIG. 1 shows an immunoblot of rAAV-hVEGF165-transduced rat cardiac myocytes.
- Cardiac myocytes were transduced with rAAV-hVEGF ⁇ 65 or rAAV-LacZ (5 x 10 3 virions/cell). Twenty-four hours after transduction, the cells were lysed.
- VEGF protein in the lysates was separated by 7.5% polyacrylamide gel electrophoresis and blotted onto membranes. Expression of 42-kDa VEGF protein was evident in the rAAV-hVEGFi6 5 -transduced myocytes (lane 2), whereas no VEGF protein was detected in the rAAV-LacZ-transduced cardiac myocytes (lane 3).
- Lane 1 shows human recombinant VEGF ⁇ 65 (3 ng/lane) and serves as a positive control.
- FIG. 2 shows the results of immunohistochemical staining for VEGF in transduced rat cardiac myocytes. Cells were transduced with rAAV-hVEGFi 65 (A) or rAAV-LacZ (B) at 5 x 10 3 virions/cell for 24 h followed by staining with anti-human VEGF165 antibody. Original magnification xlOO.
- FIG. 4 shows expression of VEGF mRNA in vector-injected muscle tissues and organs. Muscle tissues and organs were isolated at various time points after intramuscular injection and total RNA was extracted. After DNase I treatment, RT- PCR using human VEGF-specific primers was performed. The sizes of PCR products for rat GAPDH and human VEGF were 747 bp and 531 bp, respectively. VEGF expression plasmid (pCMV-VEGF) was used as a positive control. GAPDH mRNA served as an internal standard. The PCR products were electrophoresed on ethidium bromide-stained 0.2% agarose gels. Three independent experiments yielded identical results.
- pCMV-VEGF VEGF expression plasmid
- FIG. 5 depicts VEGF secretion from rAAV-hVEGF ⁇ 6 s-injected tibialis anterior muscles.
- muscle tissues were excised and cultured in serum-free DMEM/F-12 medium.
- An ELISA kit was used to measure culture supernatant VEGF concentration.
- 6A Representative record of blood flow.
- 6B Mean blood flow in the ischemic limbs. Values are expressed as % of contralateral limbs and are shown as mean values + SEM (p ⁇ 0.01)
- FIG. 7 depicts thermography of rat hindlimbs performed 6 weeks after rAAV- hVEGF ⁇ 65 injection. Rats were anesthetized and their lower body coats were shaved.
- the skin temperature of each rat hindlimb was measured with infrared thermography.
- 7A Images of infrared thermography. R; ischemic limbs, L; contralateral limbs. 7B: Average skin temperature (°C) of ischemic and contralateral hindlimbs in AAV-LacZ-
- FIG. 8. 8A Representative images of rat muscle tissues using histochemical staining for alkaline phosphatase. 8B: Capillary density in rat muscle tissues. Muscle tissues were obtained from the ischemic limbs of AAV-LacZ-transduced
- the invention provides methods for delivering recombinant AAV virions to a mammal, including a human. More particularly, it involves delivery of rAAV virions comprising a heterologous nucleic acid sequence encoding an angiogenic factor.
- recombinant AAV virion or “rAAV virion” is meant an infectious virus composed of an AAV protein shell (i.e., a capsid) encapsulating a heterologous nucleic acid sequence that is flanked by one or more AAV ITRs.
- the "heterologous nucleic acid sequence” encapsulated includes nucleic acid sequences joined together that are not normally found in association with each other in nature.
- a heterologous nucleic acid sequence could include a coding sequence flanked by sequences not found in association with the coding sequence in nature.
- Another example of a heterologous nucleic acid sequence is a coding sequence that is not found in nature (e.g., synthetic sequences having codons different from the native gene).
- recombinant AAV virions are produced using a triple transfection system that is described in U. S. Patent Nos. 6,001,650 and 6,004,797.
- This system involves the use of three vectors for rAAV virion production, including an accessory function vector, an AAV helper function vector, and a rAAV vector.
- Accessory function vectors, AAV helper function vectors, and recombinant AAV vectors can be engineered using conventional recombinant techniques.
- nucleic acid molecules can be excised from a viral genome or a vector containing the same and readily assembled in any desired order by inserting one or more ofthe desired nucleotide sequences into a construct, such as those commercially available from Stratagene, La Jolla, Calif, and other sources which are well known to those of skill in the art.
- the triple transfection method can make use ofthe pladeno5 accessory function vector (described in U. S. Patent No. 6,004,797), the AAV helper function vector pHLP19 (described in U. S. Patent No. 6,001,650), and a rAAV vector containing the heterologous nucleic acid sequence encoding an angiogenic factor.
- the nucleic acid sequences encoded by these vectors can be provided on two or more vectors in various combinations.
- rAAV virions can be produced by incorporating AAV accessory function genes into a helper virus genome such as adenovirus serotype 5, preferably a helper virus that has been rendered replication-deficient, and more preferably one that has been rendered replication-incompetent.
- a helper virus genome such as adenovirus serotype 5
- the helper virus e.g., adenovirus
- the helper virus can then infect host cells and provide the AAV Cap protein helper function as well as the necessary helper virus accessory functions.
- vector includes any genetic element, such as a plasmid, phage, transposon, cosmid, chromosome, artificial chromosome, virus, virion, etc., which is capable of replication when associated with the proper control elements and which can transfer gene sequences between cells.
- vector includes cloning and expression vehicles, as well as viral vectors.
- the AAV helper function vector encodes the "AAV helper function" sequences (i.e., rep and cap), which function in trans for productive AAV replication and encapsidation.
- AAV helper function vector facilitates efficient rAAV virion production without generating any detectable wild-type or pseudo-wild-type AAV; consequently, the triple-transfection system will allow for the production of rAAV virions without generating any detectable wild-type or pseudo-wild-type AAV virions.
- detecttable is meant the detection of any wild-type or pseudo-wild-type AAV DNA using PCR (as described in U. S. Patent No. 6,001,650, supra) or equivalent technique having the same or similar sensitivity and specificity.
- the accessory function vector encodes nucleotide sequences for non-AAV derived viral and/or cellular functions upon which AAV is dependent for replication (i.e., "accessory functions").
- the accessory functions include those functions required for AAV replication, including, without limitation, those moieties involved in activation of AAV gene transcription, stage specific AAV mRNA splicing, AAV DNA replication, synthesis of Cap expression products, and AAV capsid assembly.
- Viral-based accessory functions can be derived from any ofthe known helper viruses such as adenovirus, herpesvirus (other than herpes simplex virus type-1), and vaccinia virus.
- the accessory function vector facilitates efficient AAV vector production without the use of any helper viruses, so rAAV virions generated using the triple-transfection system will be free of adenovirus, herpesvirus, poxvirus, vaccinia virus, etc.
- the "AAV vector” can be a vector derived from any AAV serotype, including without limitation, AAV-1, AAV-2, AAV-3A, AAV-3B, AAV-4, AAV-5, AAV-6, etc.
- AAV vectors can have one or more ofthe wt-AAV genes deleted in whole or in part, i.e., the rep and/or cap genes, but retain at least one functional flanking ITR sequences, as necessary for the rescue, replication, and packaging ofthe AAV virion.
- an AAV vector is defined herein to include at least those sequences required in cis for viral replication and packaging (e.g., functional ITRs).
- the ITRs need not be the wild-type nucleotide sequences, and may be altered, e.g., by the insertion, deletion, or substitution of nucleotides, so long as the sequences provide for functional rescue, replication, and packaging.
- the AAV helper proteins i.e., Rep and Cap
- Rep and Cap need not be derived from the same serotype as the ITRs.
- AAV vectors can include one or more heterologous nucleic acid sequences flanked with functional AAV ITRs, the incorporation of the heterologous nucleic acid sequence defining a "rAAV vector.”
- Recombinant AAV virions can be purified using a variety of purification techniques that are well known in the art such as cesium chloride density centrifugation or column chromatography. Once purified, rAAV virions can be formulated into stable pharmaceutical compositions, for example as described in International Publication WO 00/32233, for delivery to a mammalian subject.
- the invention contemplates the delivery of one or more therapeutic nucleotide sequences.
- the invention encompasses AAV vectors encoding any of the known angiogenic factors, which factors may be delivered, using the methods of the present invention, to muscle cells of a mammal, including those of a human.
- the invention encompasses: delivery of VEGF for the treatment of peripheral and myocardial ischemia, delivery of FGF for the treatment of peripheral and myocardial ischemia, and the delivery of angiopoietin-1 for the treatment of peripheral and myocardial ischemia.
- Each angiogenic factor can be delivered alone or in combination.
- VEGF can be delivered alone to stimulate new blood vessel formation and enhance blood flow, or VEGF can be delivered in conjunction with FGF and/or angiopoietin-1 to stimulate new blood vessel formation and enhance blood flow.
- VEGF ⁇ 65 has 165 amino acids and is the predominant molecular form found in normal cells and tissues.
- VEGF 12 ⁇ is a less abundant, shorter form with a deletion of 44 amino acids between positions 116 and 159.
- VEGF189 is a longer form with an insertion of 24 basic residues in position 116, and VEGF 2 o ⁇ is another longer form with an insertion of 41 amino acids, which includes the 24 amino acid insertion found in VEGF 1 S9.
- the present invention is also useful for purposes other than treating an ischemic condition or delivering a l ⁇ iown angiogenic factor to a muscle. For example, an unknown gene that is thought to be an angiogenic factor gene can be expressed using the methods described herein.
- bioinformatics discovers an unknown gene "X,” which has a high degree (e.g., >70%) of nucleotide sequence identity with a known angiogenic factor gene "Y,” sufficient to identify X as a putative angiogenic factor gene.
- the X gene could be cloned into an AAV vector, thereby creating a new vector rAAV- X and, using the present invention, rAAV-X could be expressed to ascertain whether new blood vessel formation and/or increased blood flow results from expression of X.
- Y determines whether the functions of X and Y are the same or similar. Therefore, the present invention can be used to advance the field of functional genomics.
- the present invention is also useful to establish a drug-screening assay, in a manner somewhat analogous to assays described in U. S. Patent Nos. 4,980,281 and 5,688,655.
- the present invention could be used to deliver one or more angiogenic factors to a mammal, the angiogenic factor(s) could be expressed to stimulate new blood vessel growth, and various new drug candidate molecules could be administered to the mammal, with the goal of testing whether such new drug candidate molecules inhibit new blood vessel growth stimulated by the rAAV- delivered angiogenic factor(s).
- promoter/regulatory sequence is meant a DNA sequence that is required for expression.
- the promoter/regulatory sequence may be a core promoter sequence and in other instances, the promoter/regulatory sequence may also include an enhancer sequence and/or other regulatory sequences that enhance expression ofthe heterologous nucleic acid sequence.
- the promoter may be one that is constitutive or it may be inducible. If constant expression ofthe heterologous nucleic acid sequence is desired, then a constitutive promoter is used.
- constitutive promoters examples include the immediate-early cytomegalovirus (CMV) promoter, the Rous sarcoma virus promoter, and the like. Numerous other examples of constitutive promoters are well l ⁇ iown in the art and can be employed in the practice ofthe invention.
- CMV immediate-early cytomegalovirus
- Rous sarcoma virus promoter examples include the Rous sarcoma virus promoter, and the like.
- Numerous other examples of constitutive promoters are well l ⁇ iown in the art and can be employed in the practice ofthe invention.
- an inducible promoter may be used.
- the inducible promoter In an uninduced state, the inducible promoter is "silent.”
- sient is meant that little or no heterologous nucleic acid expression is ' detected in the absence of an inducer; in the presence of an inducer, however, heterologous nucleic acid expression occurs.
- one can control the level of expression by varying the concentration of inducer. By controlling expression, for example by varying the concentration of an inducer so that an inducible promoter is stimulated more strongly or more weakly, one can affect the concentration ofthe transcribed product ofthe heterologous nucleic acid sequence.
- heterologous nucleic acid sequence codes for a gene
- examples of well l ⁇ iown inducible promoters are: an estrogen or androgen promoter, a metallothionein promoter, or an ecdysone-responsive promoter. Numerous other examples are well known in the art and can be employed in the practice ofthe invention.
- tissue-specific promoters can be used to achieve tissue- or cell-specific expression of the heterologous nucleic acid sequence.
- tissue-specific promoters include several muscle-specific promoters including: skeletal -actin promoter, cardiac actin promoter, skeletal troponin C promoter, the slow-twitch cardiac troponin C promoter, and the creatine kinase promoter/enhancer.
- muscle-specific promoters that are well l ⁇ iown in the art and can be employed in the practice ofthe invention (for a review on muscle-specific promoters see Miller et al.
- heterologous nucleic acid sequence contained within the rAAV virion, is expressed to elicit a therapeutic effect.
- therapeutic effect is meant a level of expression of one or more heterologous nucleic acid sequences sufficient to alter a component of a disease (or disorder) toward a desired outcome or endpoint, such that a patient's disease or disorder shows improvement, often reflected by the amelioration of a sign or symptom relating to the disease or disorder.
- the invention also provides methods for treating ischemia in humans.
- the methods include the delivery of rAAV virions containing a heterologous nucleic acid sequence (i.e., a heterologous gene) encoding an angiogenic factor, the expression of which results in a therapeutic effect.
- the rAAV virions can be introduced into a mammal using several techniques. For example, direct intramuscular injection can be used. In one embodiment, rAAV virions are injected into a muscle.
- a catheter introduced into a peripheral artery can be used to deliver rAAV virions to a muscle of interest (such as cardiac muscle) via an artery that provides blood to the muscle of interest (such as the coronary artery which provides blood to the heart).
- the ischemic patient is injected at least once into muscle tissue with rAAV virions containing a heterologous nucleic acid sequence coding for one ofthe angiogenic factors, h one aspect, the therapeutic effect obtained is an increase in blood vessel formation. In another aspect, an increase in blood flow to the ischemic tissue is achieved.
- the dose of rAAV virion required to achieve a particular therapeutic effect e.g., the total number of rAAV virions introduced into the mammalian subject, will vary based on several factors including, but not limited to: the mammalian species, the route of rAAV virion administration, the level of heterologous nucleic acid sequence expression required to achieve a therapeutic effect, the specific disease or disorder being treated (e.g., peripheral or myocardial ischemia), a host immune response to the rAAV virion, a host immune response to the heterologous nucleic acid sequence expression product, and the stability ofthe expression product.
- a rAAV virion dose range to treat a patient having a particular disease or disorder based on the aforementioned factors, as well as other factors.
- a dose is provided that is at least 10 10 rAAV virions, preferably between about 10 10 - 10 15 , more preferably between about 10 n -10 14 , and most preferably between about 10 12 -10 13 rAAV virions to achieve a desired therapeutic effect.
- the invention provides methods for successful rAAV virion transduction leading to therapeutic expression of heterologous nucleic acid sequences.
- the discussion that follows exemplifies rAAV virion delivery of VEGF to a mammal.
- VEGF vascular endothelial growth factor
- Recombinant AAV-hVEGF ⁇ 6 5 Vector Construction, Production, and Purification
- the recombinant adeno-associated virus human vascular endothelial growth factories vector (rAAV-hVEGF ⁇ 65 ) was constructed using standard molecular biology techniques that are well known in the art. Briefly, the beta-galactosidase gene (LacZ) was excised from the rAAV-LacZ vector (rAAV-LacZ is described in U. S. Patent No. 5,858,351) and replaced with full-length human VEGF 165 cDNA driven by the CMV promoter and flanked, on its 3 'end, by the SV40 polyadenylation sequence.
- LacZ beta-galactosidase gene
- Recombinant AAV-hVEGFi ⁇ s virions were then produced using the triple transfection method described in U. S. Patent Nos. 6,001,650 and 6,004,797, supra, and purified usmg techniques also described in U. S. Patent Nos. 6,001,650 and 6,004,797, supra.
- Cardiac myocytes were prepared from ventricles of 1 -day-old Sprague- Dawley rats. After dissociation in 0.25% trypsin, cell suspensions were washed with DMEM (GIBCO BRL, Grand Island, NY) supplemented with 10% FCS (Cell Culture Laboratories, Cleveland, OH), and centrifuged at 500 g for 10 min. The cell pellets were then resuspended in DMEM containing 10% FCS. For selective enrichment of cardiac myocytes, the dissociated cells were pre-plated for 1 h, during which the non- myoctyes readily attached to the bottom ofthe culture dishes.
- the resulting suspensions of myocytes were plated onto 24-well dishes at a density of 4 x 10 5 cells/well. Seventy-two hours after plating, the cultured rat cardiac myocytes were transduced with rAAV-hVEGFi ⁇ s virions (5 x 10 3 virions/cell) for 24 h. To detect VEGF in the cytosol of transduced rat cardiac myocytes, immunoblotting was performed. Transduced rat cardiac myocytes were rinsed with ice-cold PBS and resuspended in lysis buffer (1% Nonidit P-40, 50 mM Tris-HCl, pH 7.4, 150 mM NaCl, 200 U/mL aprotinine, 1 mM PMSF).
- lysis buffer 1% Nonidit P-40, 50 mM Tris-HCl, pH 7.4, 150 mM NaCl, 200 U/mL aprotinine, 1 mM PMSF).
- cell extracts were centrifuged to remove cell debris.
- the cell lysates (15 ⁇ g of protein) were then separated by 7.5% polyacrylamide gel electrophoresis and blotted onto polyvinylidene difluoride membranes.
- the membranes were incubated for 1 h at room temperature in TBS with Tween 20 (TBST: 20 mM Tris-HCl, pH 7.4, 150 mM NaCl, 0.05% Tween 20) and 4% nonfat milk.
- Tween 20 Tween 20
- the membranes were then incubated with anti-human VEGFi ⁇ s antibody (Sigma, St. Louis, MO) at 1:1000 dilution overnight at 4 °C in TBST.
- FIG. 1 depicts the immunoblot results.
- VEGF vascular endothelial growth factor
- TBS normal rabbit serum
- diluted 1 :5 in TBS normal rabbit serum
- the cells were incubated overnight with anti-human VEGFi ⁇ s antibody (2 ⁇ g/mL) followed by incubation for 1 h with rabbit anti-mouse IgG peroxidase conjugate (dilution, 1:50; preabsorbed overnight at 4 °C with 10% preimmune rat serum and 3 % bovine serum albumin).
- FIG. 2 depicts the results. Approximately 60% of rAAV-hVEGF ⁇ 65 -transduced rat cardiac myocytes stained positive for VEGF (FIG. 2A), whereas rAAV-LacZ-transduced rat cardiac myocytes did not show staining for VEGF (FIG. 2B).
- VEGF secretion in the culture medium of transduced rat cardiac myocytes enzyme-linked immunosorbent assay (ELISA) was performed in accordance with the manufacturer's instructions included in the ELISA kit (Amersham). After the myocytes had been incubated with rAAV-hVEGFi ⁇ s for 24 h, the myocytes were rinsed twice with PBS and incubated in FCS-free medium.
- ELISA enzyme-linked immunosorbent assay
- FIG. 3 depicts the results.
- the VEGF concentration in the culture medium increased in a vector dose-dependent manner. Maximal concentration of secreted VEGF occurred at a vector dose of 5 x 10 3 and was measured to be 6 ng/mL.
- the culture medium from non-transduced rat cardiac myocytes and rAAV-LacZ-transduced rat cardiac myocytes contained no detectable VEGF.
- ischemic myocardium To produce ischemic myocardium, the trachea of an adult mouse is exposed through a midline incision ofthe neck, a tube is then placed in the trachea by using an appropriately-sized angiocatheter (such as one available from Becton Dickson), and the tube is then connected to a ventilator (such as the Small Animal Volume Controlled Ventilator available from Harvard Rodent Ventilator, model 683, Harvard Apparatus, South Natick, MA). After ventilator control of respiration is established, a thoracotomy incision is made in the second intercostals space, and a small retractor is placed in the incision to expose the heart. The anterior descending coronary artery is then ligated with surgical suture.
- angiocatheter such as one available from Becton Dickson
- a ventilator such as the Small Animal Volume Controlled Ventilator available from Harvard Rodent Ventilator, model 683, Harvard Apparatus, South Natick, MA.
- rAAV-hVEGF ⁇ 6 5 virions contained in 50 ⁇ L of PBS are injected directly into several sites ofthe myocardium on the left ventricular wall around the ischemic region.
- a small tube connected to a syringe is placed in the incision to evacuate air in the thoracic cavity, restoring negative pressure prior to the closing of the incision.
- the tube in the trachea is gently retracted after voluntary respiration is restored and the incision on the neck is then closed.
- Recombinant AAV-hVEGFi ⁇ s virions are injected into the myocardium at several sites around an ischemic region.
- Hearts are then collected 2 months after inoculation with rAAV-hVEGFi ⁇ s, and compared to a control group of mice (i.e., mice not made surgically ischemic) that also receive the same dose of rAAV-hVEGFi ⁇ s virions delivered in the same manner. At least two hearts are collected per group of experimental animals. The numbers of small blood vessels are counted with a microscope using a x 20 objective.
- Recombinant AAV vectors were diluted in 50 mM Hepes- buffered saline and carbon black was added (Pelikan Ink, Gunther Wagner) to allow for tracing ofthe injection site.
- 200 ⁇ L of rAAV vector suspension containing AAV-LacZ (10 13 virions/200 ⁇ L) were injected with a 29-gauge needle directly into the tibialis anterior muscle.
- X-Gal histochemical staining revealed ⁇ -galactosidase expression in the majority ofthe muscle fibers in the area of injection and this pattern remained consistent for the duration ofthe study period, which was 12 weeks.
- RT-PCR reverse transcription-polymerase chain reaction
- Gene expression at the mRNA level was evaluated by RT-PCR.
- Total cellular RNA of muscle tissues and remote tissues e.g., brain, heart, liver, spleen, kidney, testes
- RNA STAT-60 TAT-TEST, Inc., Friendswood, Tex.
- Extracted RNA was treated with DNase I (Takara Shuzo Co., Tokyo, Japan) to eliminate DNA contamination.
- the synthesis of first-strand cDNA was performed under conditions recommended in the ProSTAR First Strand RT-PCR kit (Stratagene, La Jolla, Calif).
- VEGF-specific primers sense: 5'-GAGGGCAGAATCATCACGAAGT-3'; antisense: 5'- CCACCTTCTTGATGTCATCA-3'.
- GAPDH mRNA served as an internal standard.
- the PCR products were electrophoresed on ethidium bromide-stained 2.0% agarose gels. VEGF gene expression was observed 4 and 10 weeks after injection (FIG. 4 shows the results). On the other hand, no VEGF gene expression was detected in
- VEGF gene expression was not detected in the brain, heart, liver, spleen, kidney, and testes in rAAV-hVEGFi ⁇ s-treated rats 4 weeks after injection (FIG. 4).
- VEGF secretion from transduced ischemic hindlimb and contralateral hindlimb muscle was examined.
- Recombinant AAV-hVEGF ⁇ 6 5-injected tibialis anterior muscle tissues were excised and cultured in serum free DMEM/F-12 medium.
- the ELISA kit was used to determine muscle culture supernatant VEGF concentrations.
- Ten weeks after rAAV-hVEGF165 injection VEGF, up to 5.3 + 1.5 ng/g tissue/24 h, was detected in the culture supernatant of rAAV-hVEGFi ⁇ s (1.8 x 10 13 virions/site)-injected muscle tissue (FIG. 5).
- ELISA measurements did not reveal any VEGF in blood taken from the peripheral veins ofthe rats at 1, 2, 4, and 8 weeks after rAAV-hVEGFi65 injection.
- each rat was re-anesthetized with an intraperitoneal injection and the lower body coats were shaved.
- the skin temperature of the rat hindlimb was measured with infrared thermography (TH3106ME, NEC San-ei Instruments, Ltd., Tolcyo, Japan).
- Blood flow at the tibialis posterior artery was measured by a transit-time ultrasound flowmeter (T206, Transonic Systems, Inc., Ithaca, New York) using a perivascular flowprobe (a representative graph is depicted in FIG. 6A).
- T206 Transonic Systems, Inc., Ithaca, New York
- the skin temperature ofthe AAV-LacZ-transduced ischemic limb was approximately 2 °C lower than that ofthe contralateral limb.
- the skin temperature ofthe rAAV- hVEGFi65-transduced ischemic limb was restored to a normal temperature (FIG. 7B).
- ischemic muscle tissues were obtained as transverse sections from the quadriceps and adductor muscles of the rat ischemic hindlimb after hemodynamic examination. Frozen sections were stained with alkaline phosphatase using an indoxyl-tetrazolium method to detect capillary endothelial cells (FIG. 8A is a representative image of rat muscle tissue using this method). Capillary density was evaluated by histological examination of 5 randomly selected fields of one muscle section, and the number of capillaries was counted (mean number of capillary per mm 2 ). As shown in FIG.
- capillary density was significantly higher in rAAV-hVEGF165-injected muscle (1062 + 75/mm 2 ) than that in AAV-LacZ-injected muscle tissues (532 + 24/mm 2 ). There was no angioma- like structures or inflammatory-cell infiltration observed in either ischemic or contralateral limbs.
Abstract
Description
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JP2002519615A JP2004506658A (en) | 2000-08-17 | 2001-08-17 | Delivery of angiogenic factors via adeno-associated virus |
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Also Published As
Publication number | Publication date |
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US20020111324A1 (en) | 2002-08-15 |
JP2004506658A (en) | 2004-03-04 |
AU2001294096A1 (en) | 2002-02-25 |
ES2288993T3 (en) | 2008-02-01 |
EP1311699B1 (en) | 2007-07-04 |
ATE366319T1 (en) | 2007-07-15 |
CA2419245A1 (en) | 2002-02-21 |
WO2002014487A3 (en) | 2003-03-13 |
US20070128163A1 (en) | 2007-06-07 |
DE60129229T2 (en) | 2008-05-08 |
EP1311699A2 (en) | 2003-05-21 |
DE60129229D1 (en) | 2007-08-16 |
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