EP3397266A1 - Fragment du facteur h pour son utilisation comme agent anti-angiogénique - Google Patents
Fragment du facteur h pour son utilisation comme agent anti-angiogéniqueInfo
- Publication number
- EP3397266A1 EP3397266A1 EP16829428.8A EP16829428A EP3397266A1 EP 3397266 A1 EP3397266 A1 EP 3397266A1 EP 16829428 A EP16829428 A EP 16829428A EP 3397266 A1 EP3397266 A1 EP 3397266A1
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- EP
- European Patent Office
- Prior art keywords
- seq
- neovascularization
- factor
- fragment
- acid sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- A61K38/1703—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- A61K38/1709—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
- A61K38/1725—Complement proteins, e.g. anaphylatoxin, C3a or C5a
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- A61K38/1703—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- A61K38/1709—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P27/00—Drugs for disorders of the senses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P27/00—Drugs for disorders of the senses
- A61P27/02—Ophthalmic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
- A61K48/005—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy characterised by an aspect of the 'active' part of the composition delivered, i.e. the nucleic acid delivered
- A61K48/0058—Nucleic acids adapted for tissue specific expression, e.g. having tissue specific promoters as part of a contruct
Definitions
- Fragment of factor H for use as an antiangiogenic agent is provided.
- the present invention relates to a complement factor F (FH) fragment for its use in the treatment and / or prevention of a pathology involving neovascularization.
- FH complement factor F
- Angiogenesis is a complex physiological mechanism that plays a major role in the genesis of neovascularization involved in various pathologies including the growth of solid tumors, atherosclerosis, rheumatoid arthritis, psoriasis and intraocular neovascular diseases such as retinopathies. proliferative or age-related macular degeneration (AMD) exudative.
- AMD age-related macular degeneration
- vascular endothelial growth factor Inhibitors of vascular endothelial growth factor (VEGF) are used in the treatment of various cancers and ocular conditions.
- VEGF inhibitors are pegaptanib, bevacizumab, ranibizumab, or aflibercept. Although these molecules represent a breakthrough in the treatment of exudative AMD, it turns out that the recovery of vision obtained through these treatments is only transient, retinal edema secondary to neovascularization recurrence and retinal degeneration occurs. continues. In addition, 20-30% of patients respond poorly to these treatments (Rasmussen and Sander, 2014) and show residual exudative signs.
- VEGF is considered a trophic factor for the survival of EPR cells (Byeon et al., 2010), maintenance of choriocapillaries (Saint-Geniez et al., 2009) and visual functions ( Saint-Geniez et al., 2009). Geniez et al., 2008).
- treatment by agents Anti-VEGF may result in long-term progressive atrophy of the neural retina, choroid, and EPR in patients with exudative AMD.
- the invention relates to a fragment of FH for its use in the treatment and / or prevention of a pathology involving neovascularization, said fragment of FH comprising the amino acid sequence represented in SEQ ID N 2.
- the inventors have demonstrated that the fragments of the FH comprising at least the SCR7 domain, represented in SEQ ID No. 2, inhibits neovascularization, in particular choroidal neovascularization.
- H factor fragments appear as a new relevant and effective solution for the treatment of pathologies, in particular ocular pathologies, related to excessive vascularization or choroidal neovascularization.
- the invention therefore proposes a new therapeutic strategy effective for the treatment of patients suffering from ocular pathologies involving excessive vascularization or choroidal neovascularization.
- FH a glycoprotein involved in the regulation of the alternate pathway of complement. More specifically, FH plays a role in the regulation of the alternative complement pathway by interacting primarily with the C3b molecule.
- FH, encoded by the FH gene is predominantly synthesized in the liver but can also be expressed locally by different cell types including EPR cells, endothelial cells, and others.
- FH has repetitive sequences of about 60 amino acids called "SCR domains" (short consensus repeat). The region of the FH involved in the fluid phase regulation of the complement activity of the alternate channel is located at the level of the SCR1-4 domains.
- FH has C3b binding sites (SCR1-4, SCR6-8, SCR12-14 and SCR19-20) and glycosylated glycans (GAGs) (SCR6-8, and SCR19-20).
- SCR19-20 is also a link site to C3b and more specifically to C3d.
- FH also has C-reactive or CRP binding sites (SCR6-8 and SCR 16-20), which is an acute phase protein synthesized primarily by the liver and plays an important role in inflammatory and serves as a biological marker for these.
- the FH has a Zinc binding site (SCR6-8), important for the oligomerization of CFH.
- FH binds to C3b competitively with factor B (FB), resulting in accelerated dissociation of alternating C3 (C3bBb) or C5 (C3bBbC3b) convertase, which loses its activity.
- C3b-linked FH acts as a co-factor for IF, allowing it to cleave C3b into C3bi, a molecule unable to bind to FB to form C3bBb.
- Deregulation or inactivation of the alternate pathway controlled by FH may result in uncontrolled activation of C3, resulting in the assembly of the terminal components of the complement membrane attack complex or MAC.
- This complex which is composed of the C5b9 complement proteins, remains bound and forms a transmembrane pore, a cytotoxic component of the complement system, which causes lysis of the target cells.
- FH can be used to treat certain retinal degenerations because of its anti-inflammatory or antioxidant activity.
- the document WO2006 / 088950 describes a polymorphism in the FH gene generating the Y402H variant which is associated with the increased risk of developing AMD (Edwards et al., 2005; Hageman et al., 2005; Haines et al. et al., 2005. Klein et al., 2005, Despriet et al., 2006).
- document WO2011 / 113641 describes the use of FH in the treatment and / or prevention of several pathologies, including ocular pathologies.
- This application describes a HF activity that relies on its ability to bind to endogenous malondialdehyde, thereby preventing the production of proinflammatory substances.
- the activity of the FH described in this document is an anti-inflammatory activity, the anti-angiogenic activity of the FH is not described.
- the strategy proposed by WO2011 / 113641 only aims to treat pathologies comprising an inflammatory component.
- F H protects the EPR subjected to oxidative stress, in particular through a protective effect on the tight junctions of the EPR cells against oxidative stress, more precisely against the destabilization and disorganization of the tight junctions. retinal cells subjected to oxidative stress.
- the anti-angiogenic activity of FH is not described.
- human plasma FH has an anti-angiogenic role in a rat model of laser-induced neovascularization.
- the present invention differs from this teaching in identifying for the first time fragments of FH, and not the entire FH, with anti-angiogenic activity.
- FH fragments and not the entire FH, has several advantages.
- the lower molecular weight of the fragments, compared to the whole protein, allows the injection of a larger molar concentration of active molecules into the eye. Indeed, intraocular administration volumes in AMD treatments are limited (approximately 50 ⁇ in humans). It is therefore advantageous to use smaller active ingredients, in order to be able to increase their numbers, formulated in a small injection volume.
- the use of fragments makes it possible to limit the glycosylation sites, thus allowing a limitation of the glycosylation variations during their industrial production and thus to ensure, on a large scale, a homogeneity of structure.
- the fragments of the FH according to the invention not only reduce the surface of neovascularization (ie formation of new vessels) but also make it possible to reinforce the membrane integrity of the neovessels, thus limiting the diffusion of liquid or blood.
- the peptide sequence of native human FH is shown in SEQ ID NO: 1. This sequence is known to those skilled in the art and is available under UniProtKB accession number - P086031 in the uniProt database.
- FH fragment is meant a portion of the peptide sequence of factor H.
- fragment of factor H excludes the entire factor H.
- this fragment of FH has retained the same biological property of interest as human FH. In other words, it is a part of the peptide sequence of FH exhibiting the anti-angiogenic property of FH.
- biological property of interest of the FH is meant the anti-angiogenic property of said FH.
- fragment of the FH according to the invention is meant fragments of the FH comprising at least the SCR domain 7 of human FH.
- sequence SCR7 of human FH is represented in sequence SEQ ID No. 2. It is as follows:
- This sequence is encoded by the nucleotide sequence SEQ ID No. 3.
- the fragment according to the invention preferably comprises the SCR domain 7, fused with the N-terminal or C-terminal domains of the FH.
- said N-terminal or C-terminal domains of the FH consist respectively of domains SCR 1 to 4 and SCR 19 to 20.
- the fragment according to the invention preferably comprises an amino acid sequence chosen from: the sequence of the SCR7 domain of human FH, as represented in SEQ ID No. 2 and encoded by the sequence nucleotide SEQ ID NO: 3;
- polynucleotide according to the invention is meant a nucleic acid sequence encoding a factor H fragment according to the invention.
- the polynucleotide according to the invention comprises at least one coding sequence for the SCR7 domain of factor H as represented in SEQ ID No. 3.
- the polynucleotide of the invention comprises a nucleic acid sequence selected from the group consisting of SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, and SEQ ID NO. 13.
- the inventors have identified, for the first time, a novel function of FH fragments as an antiangiogenic agent and the use of such an FH fragment for the treatment of ocular pathologies involving neovascularization.
- pathologies involving neovascularization encompasses all pathologies that are characterized by abnormal angiogenic activity, i.e. the formation of new blood vessels irrigating a tumor or any other tissue abnormality, including ocular.
- the terms neovascularization and angiogenesis are synonymous and denote an abnormal and / or excessive vascularization and / or likely to lead to a pathological situation.
- Such neovascularization is found in several ocular pathologies, including exudative AMD.
- treatment or “treating” is understood to mean the action of suppressing, reducing or inhibiting the progression of the disease to which this term applies.
- treatment or “treating” is also understood to mean the action of suppressing, reducing, inhibiting the progression of the appearance of one or more symptoms of the condition or disease to which this term applies.
- the term "prevention” or “prevention” means the action of avoiding, delaying or limiting the appearance of a pathology or the symptoms of a pathology in a healthy subject, or a subject known to have a predisposition to trigger said pathology.
- the pathology involving neovascularization is ocular pathology selected from AMD, iris neovascularization, intraocular neovascularization, corneal neovascularization, retinal neovascularization, choroidal neovascularization, ischemic retinopathy, retinopathy. radiation, neovascular glaucoma, diabetic retinopathy, retinopathy of prematurity, venous vascular occlusion, non-tumor proliferative vasculopathies and cancer.
- the pathology involving neovascularization is ocular pathology selected from AMD, iris neovascularization, intraocular neovascularization, corneal neovascularization, retinal neovascularization, choroidal neovascularization, and cancer.
- said cancer is selected from the group consisting of vascularized and / or vascular intraocular tumors, proliferative tumor vasculopathies, vascular tumors of vascular or non-vascular origin such as choroidal hemangiomas, proliferations. intraretinal angiomatous, chorioretinal anastomoses or polypoidal vasculopathies.
- the pathology involving neovascularization is an ocular pathology selected from AMD and choroidal neovascularization.
- the pathology involving neovascularization is neovascular AMD.
- neovascular AMD This is indeed a group of patients likely to be treated thanks to the anti-angiogenic activity of the factor H fragments according to the invention demonstrated by the inventors.
- the pathology involving neovascularization is choroidal neovascularization. secondary to AMD or choroidal neovascularization secondary to severe myopia or intraocular inflammation or choroiditis.
- AMD Alzheimer's disease
- AMD is a pathology that first affects the center of the retina, the macula, and in fact causes a loss of precise vision. While preserving peripheral vision, which allows people to navigate globally, AMD affects quality of life significantly. It is the leading cause of irreversible central vision loss in industrialized countries. Age is the primary risk factor for AMD. The EPR in the central part of the retina is considered the first target of AMD. Thus, the damage or loss of function of the EPR causes death of the photoreceptors.
- AMD is a complex pathology linked to many factors, including environmental and genetic factors. There are two forms of AMD: the atrophic form and the wet form.
- the atrophic form also called geographic atrophy or dry AMD, results in the progressive disappearance of the cells of the EPR, then to that of the photoreceptors located at the level of the macula.
- the wet form also called neovascular or exudative, meanwhile, involves a process of angiogenesis and results in a proliferation of new abnormal vessels under the retina. These fragile vessels leak serum, responsible for an uplift of the retina, and / or blood leading to the appearance of retinal hemorrhages.
- Choroidal neovascularization corresponds to the appearance of choroidal neovessels. It corresponds to a proliferation of abnormal blood vessels under the retina, in the choroidal layer of the eyeball. Abnormal vessels can leak fluids and blood, causing edema and retinal lifting. It is most often translated by:
- metamorphopsia that is to say, disturbances of vision characterized by deformation of the images
- a relative or absolute scotoma ie a permanent gap in the visual field
- Choroidal neovascularization may be choroidal neovascularization secondary to AMD or choroidal neovascularization secondary to severe myopia, intraocular inflammation or infectious or non-infectious choroiditis.
- MAC formation resulting from activation of the complement pathway has been shown to be responsible for the development of laser-induced choroidal neovascularization in mice (Andreoli et al., 2009). Indeed, the MAC would allow the release of angiogenic factors such as VEGF, FGF-2 and PDGF, resulting in the amplification of the angiogenic process (Andreoli et al., 2009). MAC has also been shown to control VEGF expression in the mouse CNV model (Liu et al., 2011).
- the invention relates to an amino acid sequence selected from the sequences shown in SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO. 10 and SEQ ID No. 12 for the treatment of a pathology selected from AMD, preferably neovascular AMD, choroidal neovascularization and cancer. All the technical characteristics defined previously apply here.
- the fragment of the FH according to the invention may be used alone, in combination and / or in combination with other active agents, such as other substances used in the treatment of ocular pathologies, in particular anti-VEGF agents, glucocorticoids, or biological agents such as an anti-factor D antibody. These different active agents can be used in therapeutic combination, and administered in separate, combined, spread or concomitant form.
- the fragment of FH according to the invention can also be used to prepare a pharmaceutical composition for the treatment and / or prevention of an ocular pathology involving neovascularization.
- the invention also relates to a pharmaceutical composition for use in the treatment and / or prevention of an ocular pathology selected from AMD, iris neovascularization, intraocular neovascularization, corneal neovascularization, retinal neovascularization, choroidal neovascularization, ischemic retinopathy, radiation retinopathy, neovascular glaucoma, diabetic retinopathy, retinopathy of prematurity, venous vascular occlusion, non-tumor proliferative vasculopathy and cancer. All the technical features mentioned above are applicable here.
- the fragments of the FH according to the invention may be combined with any type of pharmaceutically acceptable vehicle or excipient, and optionally with a prolonged diffusion matrix, such as a biodegradable polymer, a biodegradable or non-biodegradable reservoir, particulate systems or implants intraocular or periocular to form a pharmaceutical composition according to the invention.
- a pharmaceutically acceptable refers to molecular entities and compositions that do not produce an adverse, allergic or other undesired reaction when administered to a mammal, particularly a human.
- a pharmaceutically acceptable carrier or excipient may be solid, semi-solid or liquid.
- the form of the pharmaceutical compositions, their route of administration, their dosage and their dosage naturally depend on the severity of the ocular pathology and its stage of evolution.
- the pharmaceutical composition according to the invention may be in any form that can be administered to a patient, and in particular includes liquid or solid forms, typically in the form of eye drops, gel, or oral solution, but also suspensions, lyophilized powders, capsules and tablets. Formulations formulated so that they can be administered are preferred. locally, such as eye drops and gels, or orally such as drinkable solutions, tablets, ampoules.
- the pharmaceutical composition according to the invention may also be in a form compatible with an injection, ie a local injection, a mucosal administration, an inhalation, an oral administration and more generally any formulation appropriate for the intended purpose.
- the pharmaceutical composition according to the invention is in a compatible form for ocular, intraocular, intravitreous, sub-tenonial, subretinal, intra-orbital, subconjunctival, intravenous, intra-ocular administration.
- the pharmaceutical composition according to the invention comprises from 10% to 90% by weight of a fragment of the FH relative to the total weight of the composition.
- the pharmaceutical composition according to the invention contains from 20 to 60% of a fragment of the FH relative to the total weight of the composition.
- intravitreous injection is a simple way to release a protein in the posterior segment of the eye to minimize systemic exposure.
- repeated injection can lead to complications such as haemorrhage, retinal detachments, or cataracts.
- the pharmaceutical composition of the invention further comprises another active agent, such as, for example, other substances used in the treatment of ocular pathologies.
- this other active agent may be present in the pharmaceutical composition in a proportion of at least 20% by weight relative to the total weight of said composition.
- the Factor H fragment according to the invention can be administered in the form of DNA or cDNA for local gene expression.
- another object of the invention is a polynucleotide comprising the nucleic acid sequence shown in SEQ ID NO: 3 for use in the treatment and / or prevention of a pathology involving neovascularization.
- said polynucleotide comprises a nucleic acid sequence selected from the group consisting of the sequences shown in SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, and SEQ ID NO: 13.
- Another subject of the invention is an expression vector comprising the polynucleotide encoding the factor H fragment of the invention, or an expression cassette comprising said polynucleotide for its use in the treatment and / or prevention of a pathology involving neovascularization.
- the expression vectors suitable for use according to the invention may comprise at least one expression control element operably linked to the nucleic acid sequence.
- the expression control elements are inserted into the vector and make it possible to regulate the expression of the nucleic acid sequence.
- expression control elements include lac systems, lambda phage promoter, yeast promoters or viral promoters.
- Other operational elements may be incorporated, such as a leader sequence, termination codons, polyadenylation signals and sequences necessary for transcription and subsequent translation of the nucleic acid sequence into the host system. It will be understood by those skilled in the art that the correct combination of expression control elements depends on the chosen host system. It will also be understood that the expression vector must contain the additional elements necessary for the transfer and subsequent replication of the expression vector containing the nucleic acid sequence in the host system. Such vectors are easily constructed using conventional or commercially available methods.
- the expression of the polynucleotide of the invention may, for example, be carried out locally by any method of transferring the vectorized polynucleotide by viral or non-viral methods into any cell of the eye.
- the invention therefore relates to a composition comprising a polynucleotide according to the invention for use as a gene therapy medicament.
- the means by which the vector carrying the polynucleotide can be introduced into the cells include microinjection, electroporation, transduction or transfection using DEAE-dextran, lipofection, calcium phosphate or other procedures. known to those skilled in the art.
- eukaryotic expression vectors that function in eukaryotic cells are used.
- examples of such vectors include viral vectors such as retroviruses, adenovirus, herpes virus, vaccinia virus, variola virus, poliovirus, lentivirus, bacterial expression vectors or plasmids such as pcDNA5.
- Viral vectors offer the advantage of good transfection efficiency but do not control the amount of secreted proteins.
- the encapsulated cell technology has been developed to deliver a therapeutic protein in a controlled, continuous, long-term manner in the posterior segment of the eye.
- electroporation techniques for specific transfection of the ocular ciliary muscle make it possible to use the ciliary muscle as a reservoir of plasmids encoding therapeutic proteins and thus to express and secrete the fragment according to the invention in intraocular and during an extended duration.
- the invention in another aspect, relates to a therapeutic method for the treatment of a pathology involving neovascularization, said method comprising administering a fragment of factor H comprising the amino acid sequence shown in SEQ ID NO: 2. All the technical features mentioned above are applicable here.
- the invention relates to the use of a fragment of factor H comprising the amino acid sequence shown in SEQ ID NO: 2 for obtaining a medicament for treating a pathology involving neovascularization.
- a fragment of factor H comprising the amino acid sequence shown in SEQ ID NO: 2 for obtaining a medicament for treating a pathology involving neovascularization.
- the inventors have here demonstrated the therapeutic potential of fragments of FH in relevant models of pathologies involving neovascularization. For this, they produced in cells in culture several fragments of FH. They then proceeded to the purification of these fragments.
- the assay of the biological activity of the fragments was tested in vitro on the ability of FH (1) fragments to inhibit lysis of sheep erythrocytes induced by the alternative complement pathway (C5b9 complex-related activity), (2) to accelerate the dissociation of the previously formed C3 convertase complex in 96-well ELISA plates (anti-C3 convertase activity), (3) to inactivate, in vitro, the C3b complement molecule by acting as a factor I (FI) cofactor.
- the inventors measured the inhibition of angiogenesis by the fragments produced in the model of induction of CNV by laser in the rat. This study revealed for the first time and unexpectedly, an anti-angiogenic role of fragments of FH.
- the inventors have developed fragments of the FH comprising various domains.
- sequence of SCR domains 1 to 7 of human FH as represented in SEQ ID No. 4, and encoded by the nucleotide sequence SEQ ID No. 5;
- the nucleic sequences of the FH fragments were cloned in a plasmid vector allowing the expression of these molecules in eukaryotic cells.
- the secretion of these molecules in the cell culture supernatant is favored by the N-terminal use of a judiciously selected signal peptide (MB7).
- the production of the fragments is carried out by transient transfection in the human cell line HEK 293F. After 7 days of production in batch mode, the supernatant is harvested, clarified, concentrated and sterile filtered (0.22 ⁇ ).
- the purification of the FH fragments is carried out by affinity chromatography on a Ni-NTA column or cobalt column by means of the hexahistidine tag added at the C-terminal position of the FH fragments.
- the Shard FH 1NT18 which does not contain a C-terminal tag, was purified by one or two stages of ion exchange chromatography (SP-Sepharose and Q-Sepharose). The eluted FH fragments were dialyzed against PBS buffer and concentrated if the final absorbance concentration at 280 nm was less than 30 ° C / ml.
- the anti-C3 convertase activity determines the concentration of FH or FH fragment required to dissociate 50% of the preformed C3bBb3 (IC3) C3 convertase after 32 min incubation at 34 ° C.
- the generation of C3 convertase is therefore carried out in the wells of a microtiter plate as follows: 100 ⁇ l of a solution of C3b (2.5 ⁇ g / ml) are deposited per well and incubated overnight at 4 ° C; after saturation of the unoccupied binding sites, the step of generating C3 convertase is carried out by adding 4 ⁇ g / ml of factor B (FB), 0.3 ⁇ g / ml of factor D (FD) and 1.5 mM NiC12 and incubating the mixture at 34 ° C for 120 minutes.
- FB factor B
- FD 0.3 ⁇ g / ml of factor D
- NiC12 1.5 mM NiC12
- the formed C3 convertase is dissociated by adding whole FH or FH fragments at different concentrations for 32 to 34 min at 34 ° C. After washing, the amount of the C3 convertase complex still present is determined by detection of human FB using a goat anti-FB antibody and a goat anti-Ig (H + L) antibody coupled to peroxidase.
- FH in the fluid phase, acts as an IF cofactor that cleaves C3b. IF breaks the 110 kDa chain of C3b releasing a 43 kDa fragment and thus produces C3bi.
- the FH or fragments thereof are incubated in different amounts with purified Factor I and C3b (0.14 ⁇ g and 10 ⁇ g, respectively) at 37 ° C for 30 minutes. The reaction is stopped by adding denaturation / reduction buffer containing SDS and incubation for 3 minutes at 95 ° C. Control reaction mixtures containing either C3b or C3b and F1 are also prepared and incubated under the same conditions.
- the samples are then deposited on 10% polyacrylamide gel in the presence of SDS and subjected to electrophoresis (SDS-PAGE). After staining the Coomassie blue gels, the colored bands corresponding to the cleavage products of the ⁇ chain are scanned, quantified by densitometric analysis and normalized by the values obtained for the uncleaved chain a '.
- the red blood cells of sheep whose surface is rich in sialic acid, bind the FH by its C-terminal part, thus preventing the formation of C3 convertase and consequently cell lysis.
- a suspension of sheep red blood cells (1x10 GRM / ml) is taken up in a reaction buffer containing 10 mM EGTA and 7 mM MgCl 2 and placed in the presence of a mixture of normal plasma and depleted FH plasma in order to allow the Alternate complement pathway activation.
- Increasing concentrations of FH or FH fragments are added prior to induction of alternative complement pathway activation to evaluate the inhibition of GRM lysis by these molecules.
- the mixture is incubated at 37 ° C.
- the reaction is stopped by adding a 10 mM Hepes buffer containing 2 mM EDTA. After centrifugation for 5 minutes at 1730 g, 200 ⁇ l of supernatants are taken for an optical density measurement at 414 nm. The measurement of anti-haemolytic activity is determined as a% of the control, the value of which corresponds to the molar concentration of plasma FH necessary to obtain complete inhibition of the lysis (100%).
- fragments containing SCRs 1 to 4 have anti-C3 convertase activity.
- the activity of the minimal fragment "1NT4" is significantly lower than that of the fragments containing the following SCRs (SCRs 5 to 18).
- anti-haemolytic activity is carried by fragments which consist of SCRs 1 to 4 to inhibit C3-convertase activity and SCR 19-20 to attach to sialic acid residues present on the surfaces of sheep red blood cells .
- the inventors evaluated the anti-angiogenic activity induced by each of the fragments of the FH described in point I. To do this, they used an in vivo model of choroidal neovascularization (CNV) in Long Evans rats (Janvier Labs, Le Genest - Saint-Isle, France). Material and methods 1. Quantitative test for the determination of choroidal neovascularization.
- the rats were anesthetized (using a mixture of ketamine / xylazine in a ratio of ⁇ / 100mg) and the eyes were dilated with mydriaticum and anesthetized with tetracaine.
- Six Argon laser strikes located at two papillae of the optic nerve were performed at regular intervals. Then, the cornea of these rats was protected with the application of a "Goniosol" gel. Then, 3 ⁇ 1 of a saline solution alone or a solution of FH diluted in saline solution were injected into the vitreous eyes of each rat.
- EPR / choroid / sclera Two injection times were tested: 1- in preventive mode on the same day of the laser and 2- in healing, ie 4 days post-laser. After sacrifice on days 7 or 14 post-laser, rats' eyes were enucleated and then fixed in a solution of paraformaldehyde. Only the posterior part of the eye (EPR / choroid / sclera) was removed and then cut radially. After blocking nonspecific sites with goat serum solution, the EPR / choroid / sclera complexes were labeled with an endothelial cell marker diluted in saline. The EPR / choroid / sclera complexes are then mounted between blade and coverslip using a mounting medium.
- EPR / choroid / sclera complexes Two injection times were tested: 1- in preventive mode on the same day of the laser and 2- in healing, ie 4 days post-laser. After sacrifice
- the markings were observed using a confocal "Zeiss” microscope and images of the entire laser impact, called Stacks, were taken. These images were then analyzed using the "ImageJ" software so that the marking surface was quantified for each impact and for each rat eye.
- at least 3 groups of 4 rats were tested: 1 non-injected rats (control group), 2 rats injected with saline solution (injection test group) and 3 rats injected with a solution of F H.
- SCR6-8 SCR 6 to 8 SEQ ID No. 12 0% 85%
- SCR1-4 SCR 1 to 4 SEQ ID No. 14 0% 15%
- SCR1-6 SCR 1 to 6 SEQ ID No. 16 47% 40%
- Fragments exhibiting inhibition of choroidal neovascularization also act by inhibiting MAC formation.
- results show that the rFH1NT7 and rFH7CT20 fragments have the same inhibitory activity of the transcription of angiogenesis genes namely VEGFA, VEGFR1 and VEGFR2 as the entire rFH.
- the whole FH and the 2 fragments induce an increase in the expression of the gene coding for PEDF, an angiogenesis inhibitory factor.
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1563465A FR3046355A1 (fr) | 2015-12-30 | 2015-12-30 | Fragments du facteur h pour son utilisation comme agent anti-angiogenique |
| PCT/FR2016/053689 WO2017115059A1 (fr) | 2015-12-30 | 2016-12-30 | Fragment du facteur h pour son utilisation comme agent anti-angiogénique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3397266A1 true EP3397266A1 (fr) | 2018-11-07 |
Family
ID=55361860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16829428.8A Withdrawn EP3397266A1 (fr) | 2015-12-30 | 2016-12-30 | Fragment du facteur h pour son utilisation comme agent anti-angiogénique |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20190388506A1 (fr) |
| EP (1) | EP3397266A1 (fr) |
| FR (1) | FR3046355A1 (fr) |
| WO (1) | WO2017115059A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4141026A1 (fr) * | 2021-08-31 | 2023-03-01 | Aarhus Universitet | Protéines de fusion comprenant un anticorps à domaine unique anti-c3b pour la régulation de complément |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7745389B2 (en) * | 2005-02-14 | 2010-06-29 | University Of Iowa Research Foundation | Methods for treatment of age-related macular degeneration |
| JP5250548B2 (ja) * | 2006-06-21 | 2013-07-31 | エムユーエスシー ファウンデーション フォー リサーチ ディベロップメント | 疾患の治療のための補体h因子の標的化 |
| EP2533797A1 (fr) * | 2010-02-12 | 2012-12-19 | CeMM Forschungszentrum für Molekulare Medizin GmbH | Facteur h du complément pour états pathologiques de stress oxydatif |
| FR2988298A1 (fr) * | 2012-03-23 | 2013-09-27 | Lfb Biotechnologies | Facteur h pour son utilisation comme molecule antioxydante |
-
2015
- 2015-12-30 FR FR1563465A patent/FR3046355A1/fr active Pending
-
2016
- 2016-12-30 EP EP16829428.8A patent/EP3397266A1/fr not_active Withdrawn
- 2016-12-30 WO PCT/FR2016/053689 patent/WO2017115059A1/fr not_active Ceased
- 2016-12-30 US US16/066,963 patent/US20190388506A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20190388506A1 (en) | 2019-12-26 |
| FR3046355A1 (fr) | 2017-07-07 |
| WO2017115059A1 (fr) | 2017-07-06 |
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