JP2022540187A - 新規融合タンパク質及びその用途 - Google Patents
新規融合タンパク質及びその用途 Download PDFInfo
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Abstract
Description
本発明者らは、WO2016/182335A1に記載のマウス由来の抗-CD154抗体のFc部位をヒトIgG1 Fc部位に置換した抗体(C10)の重鎖CH2及びCH3ドメインにFcγRIIα結合阻害変異体が導入された抗-CD154抗体を製造し、それを「C10M」と命名した(図1)。
前記のように製造されたキメラ抗体C10Mを野生型マウスとFcγRIIα遺伝子が形質導入された形質転換マウスに138μg静脈注射した後、10分後眼窩から採血しEDTAチューブに入れてCBC-platelet分析を行い、実験動物を犠牲させた後、肺を摘出して凍結薄片を製造し、組織染色を行うことで血栓形成の回数を計数した。
前記実施例1の結果から、本発明者らは、前記C10M抗体のFab部分を、FcγRと結合しない変形されたFc領域に連結した融合タンパク質を考案しており(図3)、前記変形されたFc領域はIgG1のヒンジ部分はそのまま適用するが、IgD及びIgG4のCH2及びCH3が混合された形態を導入することで、FcγRと結合しない変形されたFc領域を導入した。
本発明者らは、実施例2で製造されたキメラ抗体のhCD40Lとの結合親和度をバイオレイヤー干渉法(BLI)分析によって分析した。
その結果、図5及び表1に示したように、本発明の実施例1及び2でそれぞれ製造されたキメラ抗体及びキメラハイブリッド抗体は測定機器の限界のため1.0pM以下の値は区分することができなかったが、2つの物質はいずれもCD40Lに十分に高い親和度を有することが分かった。
本発明者らは、前記PG-400-1にFcγRと結合しない変形されたFc領域を導入することで、従来のヒト抗体が有する短所を十分に改善したにもかかわらず、抗原結合部位が依然としてマウス由来抗体ということから、人体内不必要な免疫反応を誘発する恐れがあると判断し、より安全なハイブリッド抗体を製造するために、本発明の基盤になる抗体の抗原結合断片であるFabの抗原決定基を除いた残りのフレームワーク部分をヒト抗体の配列に置換したヒト化抗体を考案し、それを「PG-400-2」と命名した(表2及び表3)。PG-400-1及びPG-400-2の場合、いずれもC-末端に他のタンパク質が融合されないため、変形FcのC-末端がリシン(K)で終結する配列番号6のアミノ酸配列を有するものを使用した。
本発明者らは、前記ヒト化抗-CD154抗体のFabのうち可変領域部分を選別した後、それを利用してscFvを考案して、それを前記実施例3で使用した抗-CD154抗体の重鎖コンストラクトのVH-CH1部分の代わりに挿入することで、単一鎖基盤の抗体結合-断片融合タンパク質を考案し、それを「PG-420」と命名した(表4)。本実施例において、前記抗-CD40L scFvは軽鎖可変領域(VL)-リンカー-重鎖可変領域(VH)で構成されているが、逆にVH-リンカー-VLの順に構成されるものを使用してもCD40L結合能が維持されるためそれを使用してもよく、リンカーの種類も多様な種類を使用してもよい。
前記実施例2の融合タンパク質の生産はヒト化抗体ではなくキメラ抗体の生産であり、実験室規模の少量生産である上、宿主細胞がCHO細胞でヒト細胞由来ではないため、生産されたタンパク質の糖鎖パターンがヒトタンパク質とは異なる側面が存在する。そこで、本発明者らは、宿主細胞をヒト細胞であるHEK293細胞に変更し、生産規模を3L規模に増やして、前記実施例3のヒト型組換え抗体(PG-400及びPG-410)が正常に生産されるのか否かを確認することにした。
前記実施例4で考案されたPG-400-2タンパク質の重鎖及び軽鎖をそれぞれ暗号化するポリヌクレオチドを製作した後、それを実施例2と類似してN293F Vector system(Y-Biologics)に挿入した後、それをHEK293細胞に共形質感染した。共形質感染されたHEK293細胞に対して生物反応器を介して37℃ 5%CO2条件で3L規模で6日間培養した後(FreeStyle 293 Expression Medium,Gibco)、タンパク質の発現可否を還元条件のPAGE分析で確認した。その結果、図6aで確認されるように、正常にタンパク質が生産されたことが分かった。次に、本発明者らは、前記細胞培養液をProtein A beadで充填されたカラムに積載し、親和性クロマトグラフィを行った後、washing buffer(D-PBS,pH 7.4)で洗浄し、0.1 mM glycine buffer(pH 3.3)を入れてタンパク質を溶出させた。次に、Superdex 200 culumn,running (D-PBS,pH 7.4)及びelution buffer(D-PBS,pH 7.4)を利用したゲルろ過によってタンパク質を更に精製した。
併せて、本発明者らは、前記実施例4で考案されたPG-410タンパク質の重鎖及び軽鎖をそれぞれ暗号化するポリヌクレオチドを製作した後、前記実施例5-1と同じ方式でN293F Vector system(Y-Biologics)にクローニングし、それをHEK293細胞に共形質感染した。
その結果、表6及び図7a乃至図7cで確認されるように、本発明の一実施例によるIL-10付加ヒト化抗-CD154抗体(PG-410)はゲルろ過ステップがなく、重鎖のC-末端に付加的なタンパク質(IL-10Vm)が付加されているにもかかわらず高純度に精製されることが分かった。特に、タンパク質の生産性は培養規模がPG-400-2に比べてより小さかったにもかかわらず128.2mg/Lでより高く、内毒素の含量も0.021EU/mgで非常に低く示された。
本発明者らは、前記実施例4で考案されたPG-400-2及びPG-410も実施例2で製造された融合タンパク質と同じくCD154に特異的な結合をするのか否かを、Bio-layer interferometry(BLI)分析によって分析した。
その結果、表7そして図8a及び図8bで確認されるように、PG-400-2及びPG-410はいずれもCD154に特異的に結合することが分かった。特に、PG-410の場合、Kon値がPG-400-2に比べ約4.3倍程度低いが、Kdis値は<1E-07で高い特定を示した。これはPG-410がPG-400-2に比べCD154に対する結合が多少遅く起こるが、結合後の解離速度はPG-410に比べ高いため、全体的な結合力はPG-410がより高いと示された(3,000倍以上高い)。しかし、全体的にはPG-400-2及びPG-410はいずれもCD154に特異的に結合することが分かり、PG-410の場合、結合後の回路速度がより低いことがCD154を発現するターゲット細胞でIL-10の効果を持続するのに役に立つと期待される。
本発明者らは、単量体性IL-10変異体(IL-10Vm)が重鎖のC-末端に付加された形態のヒト型組換え抗体(PG-410)のIL-10が本来の機能を発揮するのか否かを確認するために、免疫細胞の免疫反応に及ぼす影響を調べた。
従来の組換えIL-10は投与濃度を上げるか繰り返し投与したら血液内のヘモグロビン濃度が減少することで貧血症状を起こし、血小板濃度が減少することで血小板減少症(thromocytopenia)を起こす副作用が報告されている(Tilg et al.,J.Immunol.164(4):2204-2209,2002;Fedorak et al.,Gastroendocrinol.119(6):1473-1482,2000)。そこで、本発明者らは、実施例4で製造されたPG-410を対象に食品医薬品安全庁告示第2017-183号(2017年8月30日)の「非臨床試験の管理基準」によるGLP適用試験を行うために、毒性検査をBiotoxtechに依頼し実施した。
本発明者らは、本発明の一実施例によるヒト型組換え抗体PG-410が臓器移植の際に発生する主な副作用である移植片対宿主病の治療に使用可能であるのか否かを動物モデルを介した実験によって調べた。
上述したように、本発明の一実施例で使用された変形Fc領域タンパク質はFcγ受容体との結合力が除去されるように考案された変異体である。そこで、本発明者らは、本発明の一実施例によって使用された前記変形Fc領域タンパク質が実際に多様なFcγ受容体と結合しないのか否かを調べることにした。
Claims (26)
- ヒトCD154に特異的に結合するFabまたはscFv、及びFc領域を含むCD154に特異的に結合する融合タンパク質において、
前記Fc領域はFcγ受容体に結合しないように変異された変形Fc領域である、CD154に特異的に結合する融合タンパク質。 - 前記ヒトCD154に特異的に結合するFabは、配列番号2で記載されるアミノ酸で構成される軽鎖、及び配列番号9で記載されるアミノ酸で構成される重鎖VH-CH1断片、または
配列番号4で記載されるアミノ酸配列で構成される軽鎖、及び配列番号11で記載されるアミノ酸配列で構成される重鎖VH-CH1断片で構成される、請求項1に記載のCD154に特異的に結合する融合タンパク質。 - 前記scFvは、配列番号14で記載されるアミノ酸配列で構成される軽鎖可変ドメイン(VL)及び配列番号15で記載されるアミノ酸配列で構成される重鎖可変領域がリンカーペプチドによって連結されたものである、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- 前記Fcγ受容体は、FcγRI、FcγRIIA、FcγRIIB1、FcγRIIB2、FcγRIIIA、及び/またはFcγRIIIBである、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- 前記ヒトCD154に特異的に結合するFabまたはscFv、及びFc領域は抗体由来のヒンジまたはリンカーペプチドによって連結される、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- 配列番号1で記載されるアミノ酸配列で構成されるIg重鎖ペプチド、及び配列番号2で記載されるアミノ酸配列で構成されるIg軽鎖ペプチド、または
配列番号3で記載されるアミノ酸配列で構成されるIg重鎖ペプチド、及び配列番号4で記載されるアミノ酸配列で構成されるIg軽鎖ペプチドで構成される、請求項1に記載のCD154に特異的に結合する融合タンパク質。 - 前記Fc領域は配列番号5または6のアミノ酸配列で構成される、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- 前記Fc領域は配列番号5または6のアミノ酸配列の18番目アミノ酸配列がTに、196番目アミノ酸配列がMに変異されたものである、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- Fc領域のC-末端にIL-10タンパク質が付加される、請求項1に記載のCD154に特異的に結合する融合タンパク質。
- 前記IL-10タンパク質は、ヒトIL-10タンパク質の成熟型(mature form)を基準に87番目アミノ酸であるイソロイシンがアラニンに置換されたIL-10変異体タンパク質である、請求項9に記載のCD154に特異的に結合する融合タンパク質。
- 前記IL-10タンパク質は、ヒトIL-10タンパク質の成熟型を基準に116番目アミノ酸であるアスパラギンと117番目アミノ酸であるリシンの間に6乃至12a.a.の長さを有するペプチドが挿入された単量体性IL-10変異体タンパク質である、請求項10に記載のCD154に特異的に結合する融合タンパク質。
- a)CD154に特異的に結合する抗体の抗原-結合断片または抗体ミメティックと、
b)Fcγ受容体に結合しないように変異された変形Fc領域と、
c)IL-10タンパク質と、を順次に含む、CD154に特異的に結合する融合タンパク質。 - a)及びb)、及び/または、b)及びc)の間には独立して少なくとも一つ以上のリンカーペプチドが含まれる、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 前記a)及びb)の間のリンカーペプチドは抗体由来のヒンジである、請求項13に記載のCD154に特異的に結合する融合タンパク質。
- 前記抗体の抗原-結合断片は、Fab、F(ab’)2、Fab’、scFv、diabody、triabody、sdAb(single domain antibody)、VNARまたはVHHである、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 前記抗体ミメティックは、affibody、affilin、affimer、affitin、alphabody、anticalin、avimer、DARPin、Fynomer、Kunitz domain peptide、monobody、repebody、VLR、またはnanoCLAMPである、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 前記Fc領域は配列番号5または6のアミノ酸配列で構成される、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 前記Fc領域は配列番号5または6のアミノ酸配列の18番目アミノ酸配列がTに、196番目アミノ酸配列がMに変異されたものである、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 前記IL-10タンパク質は、ヒトIL-10タンパク質の成熟型を基準に87番目アミノ酸であるイソロイシンがアラニンに置換されたIL-10変異体タンパク質である、請求12に記載のCD154に特異的に結合する融合タンパク質。
- 前記IL-10タンパク質は、ヒトIL-10タンパク質の成熟型を基準に116番目アミノ酸であるアスパラギンと117番目アミノ酸であるリシンの間に6乃至10a.a.の長さを有するペプチドが挿入された単量体性IL-10変異体タンパク質である、請求項12に記載のCD154に特異的に結合する融合タンパク質。
- 請求項12乃至請求項20のうちいずれか一項に記載の融合タンパク質を暗号化するポリヌクレオチド。
- 請求項21に記載のポリヌクレオチドを含むベクター。
- 請求項1乃至請求項20のうちいずれか一項に記載の融合タンパク質を有効成分として含む、免疫抑制用薬学的組成物。
- 臓器移植患者の免疫抑制に使用される、請求項23に記載の薬学的組成物。
- 請求項1乃至請求項20のうちいずれか一項に記載の融合タンパク質を有効成分として含む、自己免疫疾患治療用薬学的組成物。
- 前記自己免疫疾患は、1型糖尿病、円形脱毛症(alopecia areata)、抗リン脂質抗体症候群(antiphospholipid antibody syndrome)、関節リウマチ、乾癬または乾癬性関節炎、多発性硬化症(multiple scelerosis)、全身性エリテマトーデス(systemic lupus erythematosus)、炎症性腸疾患(inflammatory bowel disease)、アジソン病(Addison’s disease)、グレーブス病(Graves’ disease)、シェーグレン症候群(Sjoegren’s Syndrome)、ギラン・バレー症候群(Guillian-Barre syndrome)、ハシモト甲状腺炎(Hashimoto’s thyroiditis)、重症筋無力症(Myasthenia gravis)、炎症性筋疾患(inflammatory myophathy)、自己免疫性血管炎(autoimmune vasculitis)、自己免疫性肝炎(autoimmune hepatitis)、溶血性貧血(hemolytic anemia)、特発性血小板減少性紫斑病(idiopathic thrombocytopenic purpura)、原発性胆汁性肝硬変(primary biliary cirrhosis)、強皮症(scleroderma)、白斑(vitiligo)、悪性貧血(pernicious anemia)、またはセリアック病(celiac disease)である、請求項25に記載の薬学的組成物。
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WO2024141788A1 (en) * | 2022-12-29 | 2024-07-04 | Affyxell Therapeutics Co., Ltd. | Genetically modified stem cells expressing exogenous binding agents and uses thereof |
WO2024141790A1 (en) * | 2022-12-29 | 2024-07-04 | Affyxell Therapeutics Co., Ltd. | Genetically modified cells comprising a nucleic acid encoding a cd40l binding agent and uses thereof |
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