JP6276690B2 - ヒトリラキシン−2を調製する方法 - Google Patents
ヒトリラキシン−2を調製する方法 Download PDFInfo
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- JP6276690B2 JP6276690B2 JP2014523338A JP2014523338A JP6276690B2 JP 6276690 B2 JP6276690 B2 JP 6276690B2 JP 2014523338 A JP2014523338 A JP 2014523338A JP 2014523338 A JP2014523338 A JP 2014523338A JP 6276690 B2 JP6276690 B2 JP 6276690B2
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- fmoc
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- cys
- relaxin
- leu
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Classifications
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- C07K14/575—Hormones
- C07K14/64—Relaxins
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Description
したがって、得られた結果により、1)機能的に関連のある内因性心血管リラキシン系の存在、および2)心不全におけるリラキシンの代償性役割が示唆される。
インスリンのように、リラキシン−2は、2つのジスルフィド架橋によって相互連結した2つの異なるポリペプチド鎖(AおよびB)からなっている(Bourellら、1990年)。
A鎖:
pGlu−Leu−Tyr−Ser−Ala−Leu−Ala−Asn−Lys−Cys−Cys−His−Val−Gly−Cys−Thr−Lys−Arg−Ser−Leu−Ala−Arg−Phe−Cys
Asp−Ser−Trp−Met−Glu−Glu−Val−Ile−Lys−Leu−Cys−Gly−Arg−Glu−Leu−Val−Arg−Ala−Gln−Ile−Ala−Ile−Cys−Gly−Met−Ser−Thr−Trp−Ser
A鎖内:
Cys−10とCys−15
A鎖とB鎖の架橋:
A鎖のCys−11とB鎖のCys−11
A鎖のCys−24とB鎖のCys−23
ジスルフィド架橋分子の分子量:5963.1Da(理論上)
5962.5(ESI−MS)
産物の品質および経済面を考慮すると、現在まで実施されてきた合成戦略では不十分である。
A鎖:
pGlu−Leu−Tyr−Ser−Ala−Leu−Ala−Asn−Lys−Cys−Cys−His−Val−Gly−Cys−Thr−Lys−Arg−Ser−Leu−Ala−Arg−Phe−Cys
B鎖:
Asp−Ser−Trp−Met−Glu−Glu−Val−Ile−Lys−Leu−Cys−Gly−Arg−Glu−Leu−Val−Arg−Ala−Gln−Ile−Ala−Ile−Cys−Gly−Met−Ser−Thr−Trp−Ser
を有するヒトリラキシン−2を調製するための方法によって達成され、
本発明による方法は、以下の工程、すなわち、
A鎖とB鎖の合成に必要なアミノ酸に通常の保護基を提供し、この保護基ではシステインをトリチル保護アミノ酸(L−Cys(Trt)−OH)として使用すること、固相合成の後にそれぞれAおよびB鎖のクロマトグラフィー精製を達成すること、続いてpH7.9から8.4までの炭酸水素アンモニウム緩衝液中でそれぞれAおよびB鎖のフォールディングと結合とを同時に行うこと、ならびに、その後、形成されたリラキシン−2を精製することを含む。
Fmoc−L−Ala−OH、Fmoc−L−Arg(Pbf)−OH、Fmoc−L−Asn(Trt)−OH、Fmoc−L−Asp(OtBu)−OH、Fmoc−L−Glu(OtBu)、Fmoc−L−Cys(Trt)、Fmoc−L−Gln(Trt)、Fmoc−L−Glu(OtBu)−OH、L−pGlu−OH、Fmoc−Gly−OH、Fmoc−L−His(Trt)、Fmoc−L−Ile−OH、Fmoc−L−Leu−OH、Fmoc−L−Lys(Boc)−OH、Fmoc−L−Met−OH、Fmoc−L−Phe−OH、Fmoc−L−Ser(tBu)−OH、Fmoc−L−Thr(tBu)−OH、Fmoc−L−Trp(Boc)、Fmoc−L−Tyr(tBu)−OH、およびFmoc−L−Val−OH。
従来の合成戦略は、リラキシン−2分子中の、3つのジスルフィド架橋の選択的導入に基づいている。これは一方では莫大な化学的消費を意味し、他方では各ジスルフィド架橋が生じた後に必要であるクロマトグラフィー精製方法を必要とし、予想される産物に次々に少なからぬ物質の損失を生じる。
A鎖の配列:
pGlu−Leu−Tyr−Ser−Ala−Leu−Ala−Asn−Lys−Cys−Cys−His−Val−Gly−Cys−Thr−Lys−Arg−Ser−Leu−Ala−Arg−Phe−Cys
MW:2,656.2Da
B鎖の配列:
Asp−Ser−Trp−Met−Glu−Glu−Val−Ile−Lys−Leu−Cys−Gly−Arg−Glu−Leu−Val−Arg−Ala−Gln−Ile−Ala−Ile−Cys−Gly−Met−Ser−Thr−Trp−Ser
MW:3,312.9Da
ガレヌス用途に好ましく適しているのは、(i)滅菌水溶液、(ii)生理溶液中で用いてもよい、リポソームでカプセル化した有効成分および(iii)軟膏剤中に加工されている、リポソームでカプセル化した有効成分である。
1.マンニトールで再構成した、凍結乾燥リラキシン−2、および、
2.リポソーム(ROVISOME(登録商標)が好ましいが他のものであってもよい)でのカプセル化(若干の代謝物を除いて有効成分が非常に安定しているので特に適した形である)。このような代謝物は、天然形として血漿中でも生じるが、窒素雰囲気中で機能することにより避けることができ、天然の内因性誘導体であるので副作用がない。
高純度有効成分の発明の適用によれば、生理水溶液中で使用することによって、短パルスのホルモンサージが達成されるかどうかがわかる。この目的のための有効成分に適した製剤は、静脈または好ましくは皮下注射用のそれぞれのアンプル中にあるのが好ましい。高純度産物は、まずアンプル中、またはペン注射用カートリッジ中で、凍結乾燥した有効成分として賦形剤、好ましくはマンニトールで調製して長期安定性を確保する。塩として20mgのマンニトールおよびアセタートで安定化した10mlアンプル(またはカートリッジ)中の凍結乾燥した治療単位を推奨するが、これによって1年より長期間の冷蔵庫温度での保存が可能になり、極めて大きく許容できる成分が含まれる。製剤を使用するために、注射の直前に、凍結乾燥物を生理学上許容できる溶液(例えば、0.9%生理食塩水を使用して)中で解凍する。
リラキシン−2のカプセル封入効率が異なる、様々なリポソーム製剤を選択した。2つの最も安定した製剤は、皮下注射の治療に後で使用するのに、および軟膏剤形として適している。
5.00% 70%を超えるホスファチジルコリン含有レシチン
1.67% イソプロパノール
1.00% ポリソルベート20
0.01% 塩化ベンザルコニウム
0.10% EDTA
0.50% リラキシン−2
粒径:約150nm
pH:5.6
静脈または皮下注射製剤の使用については、リポソーム製剤を、生理学上許容できる溶液(例えば、0.9%生理食塩水)で注射の直前に希釈するのが好ましい。
それぞれ高用量のリラキシン−2を用いて、凍結乾燥形を静脈内に試験し、リポソーム製剤を直接水溶液中で皮下注射試験し、塩基クリームを試験したところ、臨床適用の予想濃度の10倍を上回る高用量は、いかなる重大な副作用も示さず、ラットの皮膚許容性に対する寛容性試験は、有害副作用が全く見られなかった。
細胞モデルにおける研究によって、高純度リラキシンの使用は組換えペプチドの効果に匹敵する優れた効果を示すということがわかった。
天然受容体RXFP1を発現しているヒト胎生期腎臓細胞(HEK−293T)で、合成hRlx−2は、組換えヒトリラキシン−2と同じ効力でユウロピウム標識リラキシン−2を置換し、無傷の受容体活性を証明する。
急性心不全
心腎症状
心筋線維症/肥大および拡張期心不全(収縮機能が保存された)
肺高血圧症
肺、腎または、肝線維症
末梢動脈閉塞症
糖尿病
Barlos KK,Gatos D,Vasileiou Z,Barlos K.An optimized chemical synthesis of human relaxin−2.J Pept Sci.2010 Apr;16(4):200−11.
Claims (4)
- 以下のアミノ酸配列、すなわち、
A鎖:
pGlu−Leu−Tyr−Ser−Ala−Leu−Ala−Asn−Lys−Cys−Cys−His−Val−Gly−Cys−Thr−Lys−Arg−Ser−Leu−Ala−Arg−Phe−Cys
B鎖:
Asp−Ser−Trp−Met−Glu−Glu−Val−Ile−Lys−Leu−Cys−Gly−Arg−Glu−Leu−Val−Arg−Ala−Gln−Ile−Ala−Ile−Cys−Gly−Met−Ser−Thr−Trp−Ser
を有するヒトリラキシン−2を調製する方法であって、
下記工程、すなわち、
A鎖とB鎖の合成に必要なアミノ酸を保護基で保護されたアミノ酸の形態で提供し、ここでA鎖とB鎖の合成に必用なシステインはトリチル保護アミノ酸(L−Cys(Trt)−OH)の形態で提供して、A鎖とB鎖を固相合成すること、
固相合成の後にそれぞれA鎖およびB鎖のクロマトグラフィー精製を達成すること、
続いて、pH7.9から8.4までの炭酸水素アンモニウム緩衝液中で、それぞれA鎖およびB鎖のフォールディングおよび結合を同時に行うこと、ここで、酸化還元ペアとしてのシスチンとシステインの添加を、使用したペプチド(A鎖+B鎖)1mgにつきシスチン2mgおよびシステイン2mgの濃度となるように行うこと、および
その後、形成されたリラキシン−2を精製すること
を含む、ヒトリラキシン−2を調製する方法。 - 以下のアミノ酸誘導体、すなわち、
Fmoc−L−Ala−OH、Fmoc−L−Arg(Pbf)−OH、Fmoc−L−Asn(Trt)−OH、Fmoc−L−Asp(OtBu)−OH、Fmoc−L−Glu(OtBu)、Fmoc−L−Cys(Trt)、Fmoc−L−Gln(Trt)、Fmoc−L−Glu(OtBu)−OH、L−pGlu−OH、Fmoc−Gly−OH、Fmoc−L−His(Trt)、Fmoc−L−Ile−OH、Fmoc−L−Leu−OH、Fmoc−L−Lys(Boc)−OH、Fmoc−L−Met−OH、Fmoc−L−Phe−OH、Fmoc−L−Ser(tBu)−OH、Fmoc−L−Thr(tBu)−OH、Fmoc−L−Trp(Boc)、Fmoc−L−Tyr(tBu)−OH、およびFmoc−L−Val−OH
を使用する、請求項1に記載の方法。 - C末端としてのセリンを予めロードした樹脂担体、すなわちFmoc保護TentaGel R−PHPを、前記B鎖の合成に使用する、請求項1または請求項2に記載の方法。
- C末端としてのFmoc−L−Cys(Trt)を予めロードした樹脂担体を前記A鎖の合成に使用する、請求項1から請求項3のいずれか一項に記載の方法。
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