JPWO2019107445A1 - 活性調節剤 - Google Patents
活性調節剤 Download PDFInfo
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- JPWO2019107445A1 JPWO2019107445A1 JP2019557290A JP2019557290A JPWO2019107445A1 JP WO2019107445 A1 JPWO2019107445 A1 JP WO2019107445A1 JP 2019557290 A JP2019557290 A JP 2019557290A JP 2019557290 A JP2019557290 A JP 2019557290A JP WO2019107445 A1 JPWO2019107445 A1 JP WO2019107445A1
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Abstract
Description
[1] CD300a結合性物質を含み、マクロファージにおけるCD300b依存性貪食シグナルを調節するための活性調節剤。
[2] 前記CD300a結合性物質がマクロファージにおけるCD300aの活性を阻害する物質である[1]に記載の活性調節剤。
[3] 前記CD300a結合性物質がCD300aとホスファチジルセリンの結合を阻害する物質である[1]または[2]に記載の活性調節剤。
[4] 前記CD300a結合性物質が抗体またはペプチドである、[1]〜[3]のいずれかに記載の活性調節剤。
[5] 前記CD300a結合性物質が抗CD300a抗体である、[1]〜[3]のいずれかに記載の活性調節剤。
[6] 前記抗CD300a抗体がCD300a中和抗体である、[5]に記載の活性調節剤。
[7] 前記抗CD300a抗体が抗CD300aモノクローナル抗体である、[5]または[6]に記載の活性調節剤。
[8] [1]〜[7]のいずれかに記載の活性調節剤を含有する虚血性疾患用薬剤。
[9] 前記虚血性疾患用薬剤が、虚血性心疾患、虚血性脳疾患、虚血性腸疾患、虚血性腎疾患、四肢虚血、網膜虚血、虚血性肺疾患および脊髄虚血から選択される一種以上を治療または予防するための薬剤である、[8]に記載の虚血性疾患用薬剤。
本発明の「活性調節剤」はCD300a結合性物質を含み、マクロファージにおけるCD300b依存性貪食シグナルを調節することを特徴とする。本発明の活性調節剤は、具体的には、該活性調節剤に含まれるCD300a結合性物質がCD300aと結合することで、CD300aとPSとの結合が阻害(中和)されることでCD300b依存性貪食シグナル伝達を促進する。
前記CD300a結合性物質は、マクロファージにおけるCD300aの活性を阻害する物質であることが好ましく、CD300aとPSとの結合を阻害する物質であることがさらに好ましい。CD300aの活性を阻害する物質は、特に限定されないが、抗体またはペプチドであることが好ましく、抗CD300a抗体であることがより好ましい。
本発明の活性調節剤において用いられる抗CD300a抗体は、CD300aを抗原として特異的に認識する抗体である。抗CD300a抗体は遊離の抗体であってもよいし、他の任意の物質(例えば補助薬剤等)が直接または間接的に固定された抗体であってもよい。前記活性調節剤において含まれるのは特定の一種類のモノクローナル抗体であってもよいし、二種類以上のモノクローナル抗体の組み合わせ(ないしポリクローナル抗体)であってもよいが、特異性という観点から一種類のモノクローナル抗体が含まれていることが好ましい。
本発明においてCD300a結合性物質として用いられるペプチドは、マクロファージにおけるCD300aの活性を阻害するペプチドであることが好ましく、CD300aとPSとの結合を阻害するペプチドであることがさらに好ましい。例えば、CD300aと特異的に結合するペプチドを選択することが好ましく、具体的にはCD300aのリガンドとなり得るペプチドであって、マクロファージにおけるCD300aの活性を阻害するペプチドであることが好ましい。
本発明の「虚血性疾患用薬剤」は、前記活性調節剤を有効成分として含有する。該活性調節剤により、CD300b依存性貪食シグナル伝達が促進されることで、虚血部位におけるアポトーシス細胞は速やかに貪食により除去(クリアランス)されることから、アポトーシス細胞の組織内への蓄積を抑制することができ、虚血性疾患の治療、または予防を行うことが可能となる。
野生型マウス(C57BL/6J)から胸腺を採取して分離した胸腺細胞に、デキサメサゾン10μMを加えて12時間培養することでアポトーシスを誘導し、さらにpHrodo(商標)色素で標識した。
CD300afl/flマウス(筑波大学生命科学動物資源センター製)とLysm−Creマウス(Jackson laboratory社)とを掛け合わせることで、マクロファージ特異的なCD300aコンディショナルノックアウトマウスである、CD300afl/flLysm−Creマウスを作製した。
参考例2と同様の手法で作製したCD300afl/flLysm−CreマウスおよびCD300afl/flマウス(コントロールマウス)それぞれの両側腎動脈を30分閉塞させた後、参考例2と同様の手法で再灌流処置を行った。再灌流処置後24時間、72時間の腎臓を採取し、常法にしたがって組織標本を作製し、ヘマトキシリンエオジン染色、もしくはTUNEL染色(Apoptag, Millipore)を行った。
野生型マウス(C57BL/6J)に、コントロール抗体(IC17-mouse IgG1 sFc, 中外製薬株式会社)もしくは抗CD300a抗体(TKA139, 中外製薬株式会社)20mg/kgを経静脈投与した。投与3時間後、参考例2と同様の手法で、腎虚血処置、および30分後に再灌流処置を行い、さらに24時間後の尿素窒素(BUN)およびクレアチニン(Cre)の血清中濃度をそれぞれ測定した。
参考例2と同様の手法で作製したCD300afl/flLysm−CreマウスおよびCD300afl/flマウス(コントロールマウス)それぞれについて、麻酔下に頚部を切開し頚動脈からシリコンコートされたモノフィラメントカテーテル(Doccol Corporation社)を挿入し留置して右中大脳動脈を閉塞することで(一過性脳虚血処理)、中大脳動脈閉塞(MCAO: right middle cerebral artery occlusion)モデルを作製した (Shichita et al. Nat Med 2016)。閉塞処理60分後、カテーテルを抜去して脳血流を再灌流させ、手術創を閉鎖した。
野生型マウス(C57BL/6J)について、参考例4と同様の手法で一過性脳虚血処理を行った。処理60分後、コントロール抗体(IC17-mouse IgG1 sFc, 中外製薬株式会社)または抗CD300a抗体を20mg/kgを、経静脈で投与した。その後、それぞれのマウスにおける神経学的所見について参考例4と同様のスコアに基づいた評価を行った。
野生型マウス(C57BL/6J)に、参考例4と同様の手法で一過性脳虚血処理を行った。処理3時間後、上述した神経学的スコアが3(回旋する)のマウスを選択し、それぞれコントロール抗体もしくは抗CD300a抗体を20mg/kg経静脈投与し、その後の神経学的所見について参考例4で示した神経学的スコアに基づいた評価を行った。
参考例2と同様の手法で作製した、CD300afl/flLysm−Creマウスおよび野生型マウス(C57BL/6J)それぞれについて、全身麻酔後、呼吸器補助を行って開胸し、左冠動脈左前下行枝を6−0プロリーン(登録商標)糸にて結紮することで心筋梗塞モデルを作製した(Mahmoud et al. Nat Prot 2014)。術後1週間後に梗塞巣をドップラーエコーにて確認し、梗塞巣が確認されたマウスについてその後の生存率を観察した。
Claims (9)
- CD300a結合性物質を含み、マクロファージにおけるCD300b依存性貪食シグナルを調節するための活性調節剤。
- 前記CD300a結合性物質がマクロファージにおけるCD300aの活性を阻害する物質である請求項1に記載の活性調節剤。
- 前記CD300a結合性物質がCD300aとホスファチジルセリンの結合を阻害する物質である請求項1または2に記載の活性調節剤。
- 前記CD300a結合性物質が抗体またはペプチドである、請求項1〜3のいずれか1項に記載の活性調節剤。
- 前記CD300a結合性物質が抗CD300a抗体である、請求項1〜3のいずれか1項に記載の活性調節剤。
- 前記抗CD300a抗体がCD300a中和抗体である、請求項5に記載の活性調節剤。
- 前記抗CD300a抗体が抗CD300aモノクローナル抗体である、請求項5または6に記載の活性調節剤。
- 請求項1〜7のいずれか1項に記載の活性調節剤を含有する虚血性疾患用薬剤。
- 前記虚血性疾患用薬剤が、虚血性心疾患、虚血性脳疾患、虚血性腸疾患、虚血性腎疾患、四肢虚血、網膜虚血、虚血性肺疾患および脊髄虚血から選択される一種以上を治療または予防するための薬剤である、請求項8に記載の虚血性疾患用薬剤。
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US20210188973A1 (en) | 2021-06-24 |
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