JP2020509011A - エリスロポエチン由来ペプチドの細胞損傷防止に対する効果を介した活用 - Google Patents
エリスロポエチン由来ペプチドの細胞損傷防止に対する効果を介した活用 Download PDFInfo
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Abstract
Description
細胞増殖副作用を除去したエリスロポエチン(EPO:erythropoietin)由来ペプチド、及び前記ペプチドを含む退行性神経疾患の予防用または治療用の薬学的組成物に関する。
本発明のエリスロポエチン由来ペプチドは、従来公知された固相合成(solid phase peptide synthesis)技術により、単量体に合成した(Peptron, Daejeon, 韓国)。
具体的には、天然エリスロポエチン受容体のターゲット地域(site 2)の配列において、重要なアミノ酸配列(Arg103、Ser104、Leu105、Leu108及びArg110)に結合することができるエリスロポエチン由来ペプチドを合成し、前記ペプチドそれぞれの具体的な特性を確認した。前記合成されたペプチドの濃度を測定するために、液体クロマトグラフィ/質量選択検出器(liquid chromatography/mass selective detector)(HP 1100 series)を利用した。純度測定は、高性能液体クロマトグラフィ(SHIMADZU prominence HPLC)分析によって行われた(>95%純度)。エリスロポエチン由来ペプチドを下記表1に示した。
シーケンス変化実験のために、エリスロポエチンとその受容体との結合模型は、既知の結合構造(Protein Data Bank ID:1EER)を基にした。知られたアミノ酸の特性を基に、エリスロポエチン由来ペプチドのアミノ酸を置換した。アミノ酸側鎖の極性により、4種(1.非極性あるいは疎水性、2.中性、3.負電荷、4.正電荷)に分類される。そのように、非極性(疎水性)、中性、負電荷または正電荷を帯びるアミノ酸の情報を利用し、既存のアミノ酸配列を置換して−、各特性の変化を誘導した。
ML1ペプチドの一部配列を変化させたペプチド、及びそれらの特徴を下記表3及び表4に示した。
前記実施例2と同一ML1基本配列を利用し、ペプチドの一部アミノ酸を置換した。このとき、既存のエリスロポエチンとその受容体との結合模型を基に置換されたアミノ酸が、既存の結合形態(タンパク質間距離)またはタンパク質構造)を害しないようにした。図7は、アミノ酸配列置換の例示を示したものであり、アラニン(Ala)をアルギニン(Arg)に置換する場合、既存の結合を妨害することになるので、セリン(Ser)に置換してこそ結合邪魔をなくすことができる。
ML1ペプチドの電荷を変化させたペプチド、及びそれらの特徴を、下記表5及び表6に示した。
前記ML1基本配列のうち一部「LHVDKAVSGLRSLTTL」を利用し、次の表7のように、両末端のアミノ酸を変化させたペプチドを作製した。
エリスロポエチン由来ペプチドのエリスロポエチン受容体(EPOR)に対する結合親和度(binding affinity)確認
前記実施例1ないし3で作製したエリスロポエチン由来ペプチドが、ターゲット地域を有するエリスロポエチン受容体に結合して作用することができるか否かということを確認するために、SPR(surface Plasmon resonance)技法を利用し、結合強度を確認した。SPR技法は、光学的原理を利用し、特定の標識なしに、リアルタイムで、生体分子(biomolecules)間の相互作用を測定することにより、2分子間の親和力及び動力学(kinetics)、すなわち、Ka(association rate)及びKd(dissociation rate)を分析するシステムである。
本発明者らは、前記実施例1で合成したエリスロポエチン由来ペプチドが、天然エリスロポエチンのように安定したアルファヘリックス(螺旋)を形成するか否かということを調べた。
前記実施例1ないし3で作製したエリスロポエチン由来ペプチドが、細胞保護効果を示すか否かということを確認するために、過酸化水素(H2O2)で活性酸素増加を誘導したストレス状況において、細胞生存力(cell viability)を確認した。
前記実施例4で作製したエリスロポエチン由来ペプチドが、細胞保護効果を示すか否かということを確認するために、過酸化水素(H2O2)で活性酸素増加を誘導したストレス状況において、ミトコンドリアの活性(activity)を確認した。
前記実施例4で作製した3個のペプチド(ML1−L2、ML1−K2及びML1−R2)の細胞増殖のような副作用を確認した。
前記実施例1ないし3で作製したペプチドの細胞増殖のような副作用を確認するために、細胞生存率をMTT assay法によって評価した。
Claims (13)
- 配列番号1ないし25で構成された群から選択されるいずれか1つのアミノ酸配列で記載されるペプチド。
- 前記ペプチドは、エリスロポエチンタンパク質配列から由来したことを特徴とする請求項1に記載のペプチド。
- 前記ペプチドは、エリスロポエチン受容体に結合することを特徴とする請求項1に記載のペプチド。
- 前記ペプチドは、アルファヘリックス構造を形成することを特徴とする請求項1に記載のペプチド。
- 前記ペプチドは、細胞保護活性を示すことを特徴とする請求項1に記載のペプチド。
- 前記ペプチドは、細胞増殖副作用がないことを特徴とする請求項1に記載のペプチド。
- 請求項1に記載のペプチド、前記ペプチドを暗号化する1以上のポリヌクレオチド、前記ポリヌクレオチドを含むベクター、または前記ベクターを含む宿主細胞を有効成分として含む退行性神経疾患の予防用または治療用の薬学的組成物。
- 前記退行性神経疾患は、脳卒中、中風、心筋梗塞、痴呆、アルツハイマー病、パーキンソン病、多発性硬化症、ハンチントン病、ピック病及びクロイツフェルト・ヤコブ病によって構成された群から選択されるいずれか一つであることを特徴とする請求項7に記載の退行性神経疾患の予防用または治療用の薬学的組成物。
- 前記宿主細胞は、HEK−293E細胞、CHO(Chinese hamster ovary)細胞、BHK(baby hamster kidney)細胞、NIH−3T3細胞、HEK−293T細胞またはCOS−7細胞であることを特徴とする請求項7に記載の退行性神経疾患の予防用または治療用の薬学的組成物。
- 前記ベクターは、線形DNA、プラスミドDNAまたは組み換えウイルス性ベクターであることを特徴とする請求項7に記載の退行性神経疾患の予防用または治療用の薬学的組成物。
- 前記組み換えウイルスは、レトロウイルス、アデノウイルス、アデノ付属ウイルス、単純ヘルペスウイルス及びレンチウイルスから構成される群から選択されるいずれか一つであることを特徴とする請求項10に記載の退行性神経疾患の予防用または治療用の薬学的組成物。
- 請求項1に記載のペプチド、前記ペプチドを暗号化する1以上のポリヌクレオチド、前記ポリヌクレオチドを含むベクター、または前記ベクターを含む宿主細胞を有効成分として含む組成物を投与する段階を含む退行性神経疾患の予防または治療のための方法。
- 退行性神経疾患の予防剤または治療剤の製造のための請求項に記載のペプチド、前記ペプチドを暗号化する1以上のポリヌクレオチド、前記ポリヌクレオチドを含むベクター、または前記ベクターを含む宿主細胞を有効成分として含む組成物の用途。
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