JP7467512B2 - 不活性ポリペプチドtrpの医薬製剤 - Google Patents
不活性ポリペプチドtrpの医薬製剤 Download PDFInfo
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- JP7467512B2 JP7467512B2 JP2021577314A JP2021577314A JP7467512B2 JP 7467512 B2 JP7467512 B2 JP 7467512B2 JP 2021577314 A JP2021577314 A JP 2021577314A JP 2021577314 A JP2021577314 A JP 2021577314A JP 7467512 B2 JP7467512 B2 JP 7467512B2
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- trp2
- lecithin
- trp
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Description
TRPの凝集現象を確認するために、DLS(Dynamic Light Scattering,動的光散乱、Otsuka,ELSZ-2000Zs))と共焦点蛍光顕微鏡観察を行った。
既存にペプチドや抗体を剤形化するために使用してきた糖類やアミノ酸、硫酸アンモニウム、乳化剤を用いて、TRP2の凝集抑制効果を確認した。
乳化剤であるクレモフォールEL(Merck,238470)、卵レシチン(BOC sciences,BS18J04211)、大豆レシチン(TCI,L0023)、LysoPC(Lysophosphatidylcholines)(Avanti,830071P)、グリセロールトリオレアート(Glyceryl Trioleate)(Sigma,T7140)、DOTAP(Avanti,890890P)、DSPE-PEG-アミン(Avanti,880128P)及び大豆油(CJ第一製糖製)を含むTRP剤形のTRP凝集抑制効果を確認した。
その結果、表4及び図2に示すように、リン脂質(phospholipid)乳化剤であるクレモフォール(TRP-Cre)10%、又は0.1%の卵レシチン(TRP2-EL)、大豆レシチン(TRP2-SL)、LysoPC(TRP2-LysoPC)及びグリセロールトリオレアート(TRP2-Glyceryl trioleate)を使用して分散させる場合に、DLS上でTRP2の凝集を効果的に抑制し、平均サイズが250nm以下であるミセル(micelle)の形態で維持し、優れた分散効果を示すことを確認した。しかし、既存の難溶性低分子化合物に主に使用する大豆油(soybean oil)は、凝集抑制効果がないことが確認された。
TRPは、BMP-7の前駆体タンパク質医薬品(pro-drug)として開発した。したがって、TRPが効果的な薬理学的作用を示すためには、エンドソーム(endosome)輸送によって細胞質内に効果的に伝達されることが非常に重要である。したがって、TRP2の優れた分散効果を示す剤形がTRP2の細胞質内透過性を増進させることを確認しようとした。実施例3で凝集抑制効果を確認したクレモフォール、卵レシチン、大豆レシチン、LysoPC及びグリセロールトリオレアートに対して、TRPの細胞膜透過性増大効果を共焦点蛍光顕微鏡分析を用いて確認した。そのために、卵レシチン(EL)、大豆レシチン(SL)、LysoPC及びグリセロールトリオレアート分散剤は、0.1%の濃度となるように製造し、クレモフォール(Cre)は10%を使用した。各分散剤にTRP2が100ug/mlとなるように超音波を用いて分散させ、293A細胞に各6時間処理して固定し、実施例1のような方法でX-press単一クローン抗体(ThermoFisher R910-25)とAlexa-594(ThermoFisher A32744)で標識された二次抗体を用いて染色し、共焦点顕微鏡(Carl Zeiss,LSM700)多面(multi-layer)撮影及び立体分析を行った。
実施例3及び実施例4から、リン脂質分散剤が凝集抑制効果の他にTRP2の細胞伝達も顕著に増大させることを確認した。なお、走査電子顕微鏡写真から、細胞質内に伝達されたTRPは2層の膜構造によって囲まれていることが確認できた。このような点は、リン脂質分散剤を用いたTRP2の細胞質内への効率的伝達がエンドソーム経路を利用するであろうとの可能性を提示する。これを確認するために、Alexa Fluor 488(励起494nm、放出519nm)タンパク質標識キット(Invitrogen,MP10235)を用いて、メーカーの指示に従ってTRPタンパク質に蛍光で標識した。蛍光標識されたTRPは、卵レシチン(TRP2-EL)、大豆レシチン(TRP2-SL)、グリセロールトリオレアート(TRP2-Glyceryl trioleate)及びLysoPC(TRP2-LysoPC)を用いて、実施例4のように分散ミセルを製造した。なお、エンドソームを蛍光で確認するために、mCherry(励起587nm、放出610nm)蛍光遺伝子とエンドソームマーカーであるRab7a(Ras-related protein Rab-7a)遺伝子の融合発現ベクター(fusion expression vector)をpcDNA3.1(Invitrogen)に挿入し、mCherry蛍光とヒトRab7a遺伝子を含むmCherry-Rab7a発現ベクター(配列番号29)を作製した。
実施例1及び実施例4から、非水溶性TRPタンパク質は細胞膜表面に付着して存在することが分かった。なお、実施例5から、分散剤形を用いたミセル形成は、エンドソームによって細胞質に伝達される点が分かった。このような点は、分散剤を使用していないTRPを過量投与する場合に、細胞膜を破壊するため、細胞毒性があり、分散剤形を使用する場合に、エンドソーム再使用(endosomal recycling)によって細胞膜損傷がない可能性を暗示する。したがって、分散剤による細胞毒性減少効果を確認するために、各TRP剤形に対してJuliStage自動細胞イメージングシステム(Automated cell imaging system)を用いて、293A細胞(ThermoFisher,R70507)に対して細胞毒性を分析した。この時、293A細胞を24ウェルプレートに5,000個の細胞を敷き、16時間の間に細胞が付着するようにした。その後、様々な形態で分散されたTRP2を様々な濃度で処理し、細胞増殖を観察し、JuliStageに装着された実時間顕微鏡を用いて細胞毒性を分析した。
タンパク質医薬品において、タンパク質の安定性(stability)は、再現性、許可、安全性、薬物効果に影響を及ぼす非常に重要な課題である。既存のTRP2の安定性を確認するために、-20℃で凍結させた後、常温に移して静置し、時間によって凝集抑制能を維持するか否か確認した。その結果、表1に記述されたTRPの疎水性(hydrophobic)物理化学的特性による凝集効果により、非常に短時間(10分以内)でタンパク質凝集が起きた(図8A)。
分散剤(クレモフォール、卵レシチン又は大豆レシチン)を含むTRP剤形を動物モデルに投与した時に、治療効果の変化を確認した。以上の実施例から、卵レシチン、クレモフォール、大豆レシチン、グリセロールトリオレアート及びLysoPCのようなリン脂質(phospholipid)を含むTRP2タンパク質の分散性増大、安全性(safety)、細胞透過効率増大による薬物効果増進、安定性(stability)を増進させるのに優れた効果があることが確認できた。このような効果による治療効果増進を確認するために、腹膜線維化モデルを使用した。
Claims (7)
- 次を含む医薬製剤;
(a)細胞膜受容体の助け無しで細胞膜を透過可能にするPTD(protein transduction domain);一つ以上のプロプロテインコンバターゼ切断部位を有し、前記プロプロテインコンバターゼにより切断されて不活性TRD(tissue regeneration domain)を細胞内で活性化させるFAD(furin activation domain);及び前記FADのプロプロテインコンバターゼ切断によって活性化され、細胞内で組織成長又は形成を促進したり、或いは組織再生を誘導するTRD;を含有する不活性ポリペプチドTRP;及び
(b)レシチン、クレモフォール(Cremophor)及びトリグリセリドからなる群から選ばれる分散剤;
ここで、前記不活性ポリペプチドTRPは、配列番号28のアミノ酸配列で表されるTRP2であることを特徴とする。 - 前記レシチンは、卵レシチン、大豆レシチン、ヒマワリ油レシチン、菜種レシチン、綿実レシチン及び動物脂肪由来レシチンからなる群から選ばれることを特徴とする、請求項1に記載の医薬製剤。
- プロプロテインコンバターゼは、フーリンであることを特徴とする、請求項1に記載の医薬製剤。
- 経口投与用又は注射用であることを特徴とする、請求項1に記載の医薬製剤。
- 前記分散剤は、不活性ポリペプチドTRP100重量部に対して100~50,000重量部で含まれることを特徴とする、請求項1に記載の医薬製剤。
- 配列番号28のアミノ酸配列で表されるTRP2 100重量部に対して、レシチン、クレモフォール(Cremophor)及びトリグリセリドからなる群から選ばれる分散剤を100~50,000重量部で含む線維化疾患治療用組成物。
- 前記レシチンは、卵レシチン又は大豆レシチンであることを特徴とする、請求項6に記載の組成物。
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