WO2012105610A1 - 眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のための医薬 - Google Patents
眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のための医薬 Download PDFInfo
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- the present invention relates to prevention or treatment of a disease associated with intraocular neovascularization and / or increased intraocular vascular permeability, comprising a combination of an anti-VEGF drug and a specific pyrrolo [1,2-a] pyrazine derivative. It is related with the medicine for.
- VEGF vascular endothelial growth factor
- anti-VEGF drugs Drugs targeting VEGF (hereinafter referred to as anti-VEGF drugs) are already age-related macular degeneration (AMD), branch retinal vein occlusion (BRVO), central retinal vein occlusion (CRVO), diabetic macular disease, It is widely used clinically for the treatment of diabetic retinopathy or neovascular glaucoma.
- anti-VEGF drugs receptor antagonists related to VEGF, anti-VEGF antibodies, VEGF ligand inhibitors, nucleic acid drugs and the like are known. Specific examples include bevacizumab sodium, sorafenib, sunitinib, pegaptanib sodium, ranibizumab, and aflibercept (VEGF-Trap EYE). These are generally used as intravitreal injections in the ophthalmic field.
- Anti-VEGF drugs are known to be used in combination with other therapeutic agents (Patent Documents 5 and 6).
- a combination with tumor necrosis factor alpha (TNF ⁇ ) (Patent Documents 7 and 8), a combination with a receptor tyrosine kinase inhibitor (Patent Document 9), and a combination with an antihypertensive agent (Patent Document 10) have been reported.
- a combination of an anti-VEGF aptamer that is an anti-VEGF drug and another anti-VEGF drug (Patent Document 11) has been reported.
- the combined use of an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative has not yet been reported.
- Anti-VEGF drugs that are widely used clinically for diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability have been administered in the form of injection into the vitreous of the patient, and are frequently administered intravitreally. An injection is needed.
- ranibizumab a typical anti-VEGF drug
- lanibizumab package insert a typical anti-VEGF drug
- the present invention aims to reduce the dose and frequency of administration of anti-VEGF drugs and improve their effectiveness.
- the present inventors have conducted intensive studies, and as a result, combining these anti-VEGF drugs with a pyrrolo [1,2-a] pyrazine derivative represented by the following general formula (I), these objects can be obtained.
- the present invention has been completed. That is, the main configuration of the present invention is as follows.
- R 1 and R 2 are the same or different and each represents a hydrogen atom, a halogen atom, a trifluoromethyl group, a lower alkyl group, a lower alkoxy group or a nitro group
- R 3 represents a hydrogen atom or a halogen atom. Or a lower alkyl group.
- Prevention of diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability comprising a combination of a pyrrolo [1,2-a] pyrazine derivative represented by formula (I) or a pharmacologically acceptable
- the medicament according to (4), wherein the intravitreal injection is selected from the group consisting of an anti-VEGF antibody, a VEGF ligand inhibitor, a VEGF receptor antagonist, and a nucleic acid drug related to VEGF.
- the diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability are age-related macular degeneration (AMD), branch retinal vein occlusion (BRVO), central retinal vein occlusion (CRVO), diabetes
- AMD age-related macular degeneration
- BRVO branch retinal vein occlusion
- CRVO central retinal vein occlusion
- diabetes The medicament according to any one of (1) to (4), selected from the group consisting of macular disease, diabetic retinopathy, and neovascular glaucoma.
- the pharmaceutical agent of the present invention can enhance the intraocular angiogenesis inhibitory action and / or the intraocular vascular permeability inhibitory action in an eye disease to which an anti-VEGF drug is applied, and can maintain these effects.
- the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) can be administered orally, so it is easy to use and has a low burden on patients and medical institutions. There are advantages.
- the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) or a pharmacologically acceptable salt thereof used in the present invention is a compound having aldose reductase inhibitory activity, It can be produced according to the synthesis method described in Japanese Patent No. 2516147.
- R 1 and R 2 are the same or different and each represents a hydrogen atom, a halogen atom, a trifluoromethyl group, a lower alkyl group, a lower alkoxy group or a nitro group
- R 3 represents a hydrogen atom, a halogen atom or A lower alkyl group is meant.
- the lower alkyl group a C 1 -C 3 alkyl group is preferable, and a methyl group is particularly preferable.
- the lower alkoxy group is preferably a C 1 -C 3 alkoxy group, and more preferably a methoxy group.
- the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) or a pharmacologically acceptable salt thereof prevents or treats diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability.
- a medicament containing a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) or a pharmacologically acceptable salt thereof as an active ingredient is used for intraocular neovascularization and / or intraocular vascular permeability. It is used as an effect-enhancing agent for the prevention or treatment of diseases associated with hypersensitivity with anti-VEGF drugs.
- the medicament according to the present invention comprises a combination of an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) or a pharmaceutically acceptable salt thereof. It is a medicine to be used. This medicament is also administered for the prevention or treatment of diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability.
- VEGF is a group of glycoproteins involved in angiogenesis and angiogenesis, and is produced by various causes such as aging, ischemia reperfusion, and inflammation.
- VEGF receptor vascular endothelial growth factor receptor
- VEGF receptor vascular endothelial growth factor receptor
- Activated vascular endothelial cells migrate and proliferate to form new blood vessels.
- VEGF also enhances vascular permeability, causing bleeding, leakage of blood components, and retention of exudates.
- Anti-VEGF drugs inhibit the signal transduction pathway by vascular endothelial growth factor (VEGF) or inhibit the biological activity of VEGF.
- Anti-VEGF drugs exhibit pharmacological actions such as angiogenesis promotion inhibition, vascular permeability enhancement inhibition, and vascular endothelial cell proliferation inhibition by attenuating the action of VEGF.
- anti-VEGF drugs examples include anti-VEGF antibodies, VEGF ligand inhibitors, VEGF receptor antagonists, nucleic acid drugs related to VEGF, and the like.
- a VEGF receptor antagonist antagonizes VEGF and inhibits VEGF from binding to the VEGF receptor.
- Anti-VEGF antibodies, VEGF ligand inhibitors, and some nucleic acid drugs related to VEGF inhibit the binding of VEGF and VEGF receptors by forming a complex with VEGF.
- Other nucleic acid drugs related to VEGF inhibit protein synthesis related to VEGF.
- the anti-VEGF antibody includes an anti-VEGF antibody obtained by humanizing an anti-mouse VEGF antibody by genetic recombination, a fragment thereof, or a partially modified amino acid sequence thereof.
- VEGF ligand inhibitors include human VEGF receptor fusion proteins.
- Anti-VEGF antibodies, VEGF ligand inhibitors, VEGF receptor antagonists, nucleic acid drugs related to VEGF, and the like are all common in that they have an action of suppressing signal transmission by VEGF.
- Examples of other anti-VEGF drugs include drugs that directly suppress the production and / or synthesis of VEGF.
- VEGF-Trap EYE A specific example of a VEGF ligand inhibitor is aflibercept (VEGF-Trap EYE).
- anti-VEGF antibodies include bevacizumab sodium, ranibizumab, sorafenib, and sunitinib.
- nucleic acid drugs related to VEGF include pegaptanib sodium, which is an aptamer drug, and RTP801i-14, which is a siRNA. These are used as intravitreal injections. It should be noted that bevacizumab sodium, ranibizumab, VEGF-Trap EYE and the like inhibit binding of VEGF to the receptor by non-selectively binding to all VEGF. In contrast, pegaptanib sodium selectively binds to VEGF165, which is most involved in pathological neovascularization in the eye.
- the efficacy exhibited by administering a combination of a pyrrolo [1,2-a] pyrazine derivative of general formula (I) or a salt thereof and an anti-VEGF drug is the efficacy exhibited by administration of the anti-VEGF drug alone. It is substantially the same range.
- the main pharmacological actions of anti-VEGF drugs are angiogenesis inhibitory action and vascular permeability enhancement inhibitory action (edema inhibitory action). Therefore, the indication range of an anti-VEGF drug is an ocular disease accompanied by angiogenesis and / or increased vascular permeability, and one embodiment of the medicament according to the present invention is effective against them.
- Ocular diseases associated with intraocular neovascularization include wet age-related macular degeneration (wet type-AMD), branch retinal vein occlusion (BRVO), central retinal vein occlusion (CRVO), diabetic retinopathy, neovascular glaucoma And intraocular neovascular diseases such as myopic choroidal neovascularization, retinitis pigmentosa, retinopathy of prematurity and secondary choroidal neovascularization.
- wet type-AMD wet age-related macular degeneration
- BRVO branch retinal vein occlusion
- CRVO central retinal vein occlusion
- diabetic retinopathy neovascular glaucoma
- intraocular neovascular diseases such as myopic choroidal neovascularization, retinitis pigmentosa, retinopathy of prematurity and secondary choroidal neovascularization.
- Another embodiment of the medicament according to the present invention is an effective medicament for a disease accompanied by increased intraocular vascular permeability.
- Diseases associated with increased intraocular vascular permeability include wet age-related macular degeneration (wet type-AMD), branch retinal vein occlusion (BRVO), central retinal vein occlusion (CRVO), diabetic macular disease, retinal pigment Examples include degeneration, diabetic retinopathy, and edema due to retinal photocoagulation (panretinal photocoagulation, lattice photocoagulation, Grid Pattern coagulation).
- the intraocular neovascular disease and intraocular vascular permeability disease are not limited to these.
- the medicament according to the present invention has a synergistic effect on an intraocular neovascular disease and an intraocular vascular permeability increase for which the administration of these anti-VEGF drugs is considered effective.
- Age-related macular degeneration is a disease caused by age-related changes in the macular, and is classified into “exudation type” and “atrophy type” depending on the presence or absence of neovascularization (choroidal neovascularization) generated from the choroid.
- the medicament according to the present invention is particularly effective for wet age-related macular degeneration.
- Exudative age-related macular degeneration is caused by the occurrence of abnormal new blood vessels (CNV) at the site centering on the macular region. These new blood vessels can cause bleeding and exudation (increased vascular permeability), resulting in macular degeneration related to visual acuity, dysfunction, and scarring of the tissue.
- VEGF is said to be strongly involved in intraocular neovascularization.
- Diabetic macular disease is a general term for macular disorders caused by macular edema due to increased vascular permeability, macular disorders caused by blockage of capillaries or pigment epithelial cells.
- the main lesion is macular edema.
- the amount of VEGF in the eye is high, and since VEGF has a very strong vascular permeability enhancing action, VEGF is said to be strongly involved in diabetic macular edema.
- Retinal vein occlusion includes retinal vein branch occlusion (BRVO) and central retinal vein occlusion (CRVO).
- VEGF is produced by vein occlusion, and edema and angiogenesis are formed around the macula.
- RVO is one of the diseases associated with intraocular neovascularization and / or increased vascular permeability, and VEGF has been reported to be involved.
- Intraocular neoplasia is also associated with the onset and / or progression of retinal diseases such as central exudative choroidal retinopathy, retinitis pigmentosa, retinal pigment epithelial detachment, multiple choroiditis, choroidal neovascularization, retinopathy of prematurity It is thought that increased permeability of blood vessels and intraocular blood vessels is involved.
- the pyrrolo [1,2-a] pyrazine derivative of general formula (I) or a salt thereof used as an active ingredient of the medicament according to the present invention or an anti-VEGF drug may be contained in a plurality of different preparations. And it may be contained in the same formulation as one formulation.
- a “medicine composed of a combination (medicine composed of a combination)” is a pharmaceutical in which a plurality of pharmaceuticals or active ingredients thereof are administered in combination, in other words, a pharmaceutical administered in combination.
- a plurality of active ingredients to be administered are contained in a plurality of different preparations, it is not necessarily limited to the case where these plurality of preparations are administered to a patient at the same time.
- the administration method may not be such that the period during which the medium effective concentration or the tissue effective concentration is maintained overlaps.
- the administration may be the same number of times or may be different.
- the active ingredients can take different dosage forms. That is, the anti-VEGF drug is intravitreal injection, and the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) is an oral dosage form, but is not limited thereto.
- a medicament comprising a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) or a pharmacologically acceptable salt thereof as an active ingredient is an intraocular neovascularization and / or enhanced intraocular vascular permeability. It is used as an effect-enhancing agent for the prevention or treatment of diseases associated with anti-VEGF drugs, or as an effect-sustaining agent for anti-VEGF drugs.
- Examples of the pharmaceutical dosage forms (1) administration of a single preparation comprising both an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I), (2) Simultaneous administration of two preparations obtained by separately formulating an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) by the same administration route, (3) Administration of two preparations obtained by separately formulating an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) at the same administration route with a time difference , (4) Simultaneous administration of two preparations obtained by separately formulating an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I) through different administration routes, (5) Administration of two types of preparations obtained by separately formulating an anti-VEGF drug and a pyrrolo [1,2-a] pyrazine derivative represented by general
- an anti-VEGF drug is first administered, and after a certain time has elapsed, a pyrrolo [1,2-a] pyrazine derivative represented by general formula (I) such as ranirestat is then administered. , Administration in the order of, or administration in the reverse order.
- the pyrrolo [1,2-a] pyrazine represented by the general formula (I) is administered until the anti-VEGF drug is first administered and then the anti-VEGF drug is administered.
- the medicament according to the present invention may be one in which a plurality of active ingredients are contained in a plurality of separate preparations or one preparation in the same preparation. It can be administered in an acceptable dosage form as a tablet, capsule, powder, granule, solution, or syrup.
- pharmacologically acceptable excipients for formulation such as starch, lactose, purified sucrose, glucose, crystalline cellulose, carboxycellulose, carboxymethylcellulose, carboxyethylcellulose, calcium phosphate, magnesium stearate, Gum arabic or the like can be used, and if necessary, a lubricant, a binder, a disintegrant, a coating agent, a colorant and the like can be blended.
- a liquid agent a stabilizer, a dissolution aid, a suspending agent, an emulsifier, a buffering agent, a preservative, and the like can be used.
- the dosage of the pharmaceutical agent according to the present invention is determined according to the usual dosage of the anti-VEGF drug or the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I). It can be appropriately selected depending on the dosage form and the like. That is, the dose of the pyrrolo [1,2-a] pyrazine derivative represented by the general formula (I), particularly ranirestat, varies depending on symptoms, age, administration method, dosage form, etc., but one adult patient (body weight 60 kg) In general, the dose is usually 10 to 160 mg / day, preferably 40 to 80 mg / day, once or in several divided doses.
- the dose for oral administration is usually 10 to 160 mg / day, preferably 20 to 80 mg / day, more preferably 40 to 80 mg / day per adult patient (body weight 60 kg).
- the dose of anti-VEGF drug varies depending on the drug.
- the dose of bevacizumab sodium is 0.1 mg / dose to 2.5 mg / dose intravitreally per adult patient.
- the dose of pegaptanib is usually 0.1 mg / dose to 3 mg / dose, preferably 0.3 mg / dose intravitreally per adult patient.
- the dose of ranibizumab is usually 0.1 mg / dose to 0.5 mg / dose, preferably 0.5 mg / dose, per adult patient.
- the dose of VEGF-Trap EYE is usually 0.1 mg / dose to 4 mg / dose intravitreally per adult patient.
- administration of the anti-VEGF drug is basically from once / month to once / two to three months.
- This dosage is a general dosage of an anti-VEGF drug when not administered in combination with a pyrrolo [1,2-a] pyrazine derivative of the general formula (I).
- the dose of the anti-VEGF drug may be appropriately reduced and the number of administrations may be reduced in consideration of the effect enhancement by the combination. it can.
- the medicament of the present invention comprises a medicament comprising a pyrrolo [1,2-a] pyrazine derivative of the general formula (I), etc., and the medicament for preventing diseases associated with intraocular neovascularization and / or increased intraocular vascular permeability.
- a kit can be constructed from instructions describing how to administer in combination with an anti-VEGF drug for treatment.
- the instructions for use of the kit describe the usage and dosage when a pharmaceutical containing a pyrrolo [1,2-a] pyrazine derivative of general formula (I) or the like is administered in combination with an anti-VEGF drug. Yes.
- the usage and dose are as described above.
- the present inventors evaluated the effectiveness against CNV volume by using a mouse model that experimentally induces choroidal neovascularization (CNV) by laser irradiation.
- CNV choroidal neovascularization
- the CNV model is a model in which macrophages migrate due to inflammation induced by laser irradiation, and as a result, VEGF is produced, new blood vessels are generated, and increased vascular permeability is observed.
- the CNV model is an experimental model that evaluates the efficacy against VEGF-mediated diseases involving intraocular neovascularization and / or increased intraocular vascular permeability.
- Non-treatment group (b) Ranirestat 3 mg / kg administration group: Ranirestat 3 mg / kg gavage once a day (3 mg / kg / day)
- Ranirestat was administered from the laser irradiation day (20-30 minutes after irradiation) to 7 days after irradiation.
- Anti-VEGF antibody was administered by intravitreal injection immediately after laser irradiation. After completion of the laser irradiation, the animals were normally raised for 7 days, after which the eyeballs were removed and the volume of CNV expressed in the choroid was measured. CNV induction and evaluation were performed according to the following procedure.
- FIG. 1 is a graph showing the choroidal neovascular (CNV) volume 7 days after laser irradiation.
- Table 1 shows the CNV suppression rate of each group based on the untreated group.
- the CNV volume suppression effect was observed as compared with the untreated group, there was no significant difference, and the CNV suppression rate was 18.3%.
- the anti-VEGF antibody administration group the CNV volume suppression effect was not observed as compared with the non-treatment group.
- the combination group showed a significant inhibitory effect on CNV volume compared to the untreated group (p ⁇ 0.05), and showed a CNV suppression rate more than twice that of the ranirestat administration group.
- the results in this combination group further enhance the effectiveness of anti-VEGF drugs that have been clinically effective, and as a result, the interval until re-administration of anti-VEGF drugs can be extended, that is, the effect can be sustained. It is suggested.
- a combination of anti-angiogenic effects can be expected even for patients who are not sufficiently effective with current anti-VEGF drug treatment. Alternatively, it can be expected that even if the dose of the anti-VEGF drug is reduced, a sufficient therapeutic effect is brought about.
- the anti-VEGF antibody currently in clinical use is a non-selective human anti-VEGF drug that inhibits all VEGF isoforms, and thus does not respond to mice. Since the anti-mouse VEGF antibody used in this experiment inhibits all VEGF isoforms in the same manner as the anti-human VEGF antibody, the effect of the anti-mouse VEGF antibody in this study is related to the clinical effect of the anti-human VEGF antibody. Reflected.
- Experiment 2 Method As in Experiment 1, anti-VEGF antibody and ranirestat were administered to mice treated with CNV alone or in combination.
- the dose of ranirestat was 10 mg / kg / day, the maximum dose used in the literature. This dose is considered to be the dose that exhibits maximum efficacy.
- the number of cases was 4 per group, and the following 4 groups were set.
- Non-treatment group (b) Ranirestat 10 mg / kg administration group: Ranirestat 10 mg / kg gavage once a day (10 mg / kg / day)
- Ranirestat was administered from the laser irradiation day (20-30 minutes after irradiation) to 7 days after irradiation.
- Anti-VEGF antibody was administered by intravitreal injection immediately after laser irradiation.
- the volume of CNV was measured in the same manner as in Experiment 1.
- FIG. 2 is a graph showing the choroidal neovascular (CNV) volume 7 days after laser irradiation.
- Table 2 shows the CNV suppression rate of each group based on the untreated group.
- the CNV volume was significantly suppressed as compared with the untreated group (p ⁇ 0.001), and the CNV suppression rate was 39.3%.
- the anti-VEGF antibody administration group a significant inhibitory effect on CNV volume was not observed as compared to the non-treatment group.
- the CNV volume was significantly suppressed as compared with the untreated group (p ⁇ 0.001), and the CNV suppression rate was 53.5%.
- the CNV volume was suppressed more effectively than the ranirestat administration group. Since it is considered that the ranirestat administration group showed the maximum effect on angiogenesis suppression, it can be said that the combination group showed the angiogenesis suppression effect exceeding the maximum effect of ranirestat. Furthermore, in the combination group, an anti-VEGF antibody having a reduced effect is used in combination with ranirestat to show an angiogenesis inhibitory effect that exceeds the maximum effect of ranirestat. Since the effect of suppressing angiogenesis was obtained, it is strongly suggested that the effect of suppressing increased vascular permeability is also obtained. These results indicate that the combination could achieve an effect that could not be achieved by increasing the dose of ranirestat alone. Such effects exceeding the maximum drug efficacy are beyond the prediction of those skilled in the art.
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Abstract
Description
で示されるピロロ[1,2-a]ピラジン誘導体又はその薬理学的に許容される塩と、の組み合わせから構成される、眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のための医薬。
で示されるピロロ[1,2-a]ピラジン誘導体又はその薬理学的に許容される塩を有効成分として含み、抗VEGF薬と組み合わせて投与される、眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のための医薬。
(1)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを両方含む単一製剤の投与、
(2)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の同一投与経路での同時投与、
(3)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の同一投与経路での時間差をおいての投与、
(4)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の異なる投与経路での同時投与、
(5)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の異なる投与経路での時間差をおいての投与、
(6)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の同一投与経路での異なる投与間隔における投与、及び、
(7)抗VEGF薬と一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体とを別々に製剤化して得られる2種の製剤の異なる投与経路での異なる投与間隔における投与が挙げられる。
方法
体重約20g(6週齢)の雄性C57BL/6Jマウスの両眼にレーザーを照射(片眼当たり4~6スポット照射)して実験的にCNVを誘導した。薬物は、後述のように、抗VEGF抗体、ラニレスタットそれぞれ単独、または両者の組み合わせにより投与した。ラニレスタットの用量は文献で用いられている通常用量である3mg/kg/dayとした。抗VEGF抗体は、R&D Systems社より購入した抗マウスVEGF抗体を使用した。例数は1群当たり5匹とし以下の4群を設定した。
(a) 無処置群
(b) ラニレスタット3mg/kg投与群:ラニレスタット3mg/kgを1日1回強制経口投与(3mg/kg/day)
(c) 抗VEGF抗体投与群:抗VEGF抗体1ngを硝子体内注射により投与
(d) 併用群:抗VEGF抗体1ngを硝子体内注射により投与+ラニレスタット投与(3mg/kgを1日1回強制経口投与(3mg/kg/day))
トリブロモエタノール0.30mLをマウス腹腔内に投与して麻酔した後、散瞳薬と局所麻酔薬を点眼した。その後、マウス両眼にレーザー光凝固装置(Lumenis)を用いてレーザー(波長532nm、出力200mW、照射時間100ms、スポットサイズ100μm)を片眼に付き4~6発照射した。レーザー照射によりCNVが発現し、その後容積が増大した。
レーザー照射7日後にトリブロモエタノール麻酔下で安楽死後、マウス左右眼球を摘出した。摘出した眼球を用いて、常法に従ってフラットマウントを作製した。CNVの染色はFITC‐Griffonia simplicifolia isolectin‐B4を用いて行った。CNV容積は、CNV近傍の画像を共焦点レーザー顕微鏡(Zeiss LSM5 Pascal)で取り込み、画像解析ソフト(NIH Image J)を用いて測定した。容積はμm3で表した。
図1は、レーザー照射7日後の脈絡膜新生血管(CNV)容積を示すグラフである。表1に無処置群を基準とした各群のCNV抑制率を示す。ラニレスタット投与群では、無処置群と比較してCNV容積の抑制効果がみられたものの有意差はなく、CNV抑制率は18.3%であった。抗VEGF抗体投与群では、無処置群と比較してCNV容積の抑制効果はみられなかった。一方、併用群では、無処置群と比較してCNV容積の有意な抑制効果がみられ(p<0.05)、ラニレスタット投与群の2倍以上のCNV抑制率を示した。
今回の成績は、抗VEGF抗体の血中濃度又は組織内濃度の低下により臨床効果が減弱又は消失した状態でラニレスタットを併用しても、効果が増強されることを示すものである。抗VEGF抗体の最大薬効を示す用量は10ngであるから、今回の実験は、抗VEGF薬の硝子体内濃度が10分の1程度にまで低下した状態を想定している。このように抗VEGF薬の効果が減弱又は消失した状態でも、ラニレスタットを併用すれば、抗VEGF薬の効果を持続させることができる。併用による効果増強は、抗VEGF薬の効果の持続性、並びに効果減弱及び再燃による再投与までの間隔を延長させるので、抗VEGF薬の投与回数を減らすことに繋がる。
方法
実験1と同様に、CNVを誘導する処置を施したマウスに、抗VEGF抗体、ラニレスタットをそれぞれ単独で、又はこれらを組み合わせて投与した。ラニレスタットの用量は文献で用いられている最大用量である10mg/kg/dayとした。この用量は最大薬効を示す用量と考えられる。例数は1群当たり4匹とし以下の4群を設定した。
(a) 無処置群
(b) ラニレスタット10mg/kg投与群:ラニレスタット10mg/kgを1日1回強制経口投与(10mg/kg/day)
(c) 抗VEGF抗体投与群:抗VEGF抗体1ngを硝子体内注射により投与
(d) 併用群:抗VEGF抗体1ngを硝子体内注射により投与+ラニレスタット10mg/kgを1日1回強制経口投与(10mg/kg/day)
図2は、レーザー照射7日後の脈絡膜新生血管(CNV)容積を示すグラフである。表2に無処置群を基準とした各群のCNV抑制率を示す。ラニレスタット投与群では、無処置群と比較してCNV容積の顕著な抑制効果がみられ(p<0.001)、そのCNV抑制率は39.3%であった。抗VEGF抗体投与群では、無処置群と比較してCNV容積の有意な抑制効果はみられなかった。一方、併用群では、無処置群と比較してCNV容積の顕著な抑制効果がみられ(p<0.001)、そのCNV抑制率は53.5%であった。
抗VEGF抗体とラニレスタットとの併用群は、ラニレスタット投与群よりCNV容積の抑制効果がみられた。ラニレスタット投与群は血管新生抑制に対する最大効果を示したと考えられるので、併用群はラニレスタットの最大効果を超える血管新生抑制効果を示したといえる。さらに、併用群では、効果が減弱した抗VEGF抗体にラニレスタットを併用して、ラニレスタットの最大効果を超える血管新生抑制効果を示している。血管新生を抑制する効果が得られたことから、血管透過性亢進を抑制する効果も得られることが強く示唆される。これらの結果は、ラニレスタットの用量を増やしても単独では達成できなかった効果を、併用により達成できたことを示している。このような最大薬効以上の効果は当業者の予測を超えたものである。
Claims (7)
- 前記一般式(I)で示されるピロロ[1,2-a]ピラジン誘導体が、(3R)-2’-(4-ブロモ-2-フルオロベンジル)スピロ[ピロリジン-3,4’(1’H)ピロロ[1,2-a]ピラジン]-1’,2,3’,5(2’H)-テトロンである、請求項1又は2に記載の医薬。
- 前記抗VEGF薬が硝子体内注射剤である、請求項1~3のいずれか一項に記載の医薬。
- 前記硝子体内注射剤が、抗VEGF抗体、VEGF Ligand阻害剤、VEGF受容体拮抗薬、及びVEGFに関連する核酸医薬からなる群から選択される、請求項4に記載の医薬。
- 前記眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患が、加齢黄斑変性、網膜静脈分枝閉塞症、網膜中心静脈閉塞症、糖尿病黄斑症、糖尿病網膜症及び血管新生緑内障からなる群から選択される、請求項1~5のいずれか一項に記載の医薬。
- 請求項2に記載の医薬と、
当該医薬を、眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のために抗VEGF薬と組み合わせて投与するための方法が記載された説明書と、
からなるキット。
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JP2012555932A JPWO2012105610A1 (ja) | 2011-02-02 | 2012-02-01 | 眼内血管新生及び/又は眼内血管透過性亢進を伴う疾患の予防又は治療のための医薬 |
CN201280007456XA CN103391782A (zh) | 2011-02-02 | 2012-02-01 | 用于预防或治疗伴有眼内血管新生及/或眼内血管渗透性过高的疾病的药物 |
US13/982,786 US20140302009A1 (en) | 2011-02-02 | 2012-02-01 | Medicinal Agent for Prevention or Treatment of Diseases Associated with Intraocular Neovascularization and/or Intraocular Vascular Hyperpermeability |
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WO2019151470A1 (ja) | 2018-02-02 | 2019-08-08 | 国立大学法人 京都大学 | 眼内血管新生及び/又は眼内血管透過性亢進を伴う眼科疾患の予防又は治療のための医薬 |
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US9840553B2 (en) | 2014-06-28 | 2017-12-12 | Kodiak Sciences Inc. | Dual PDGF/VEGF antagonists |
IL290457B1 (en) | 2015-12-30 | 2024-10-01 | Kodiak Sciences Inc | Antibodies and their conjugates |
MX2020009152A (es) | 2018-03-02 | 2020-11-09 | Kodiak Sciences Inc | Anticuerpos de il-6 y constructos de fusion y conjugados de los mismos. |
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