JP2015504050A - 細胞透過性ペプチド - Google Patents
細胞透過性ペプチド Download PDFInfo
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- JP2015504050A JP2015504050A JP2014549469A JP2014549469A JP2015504050A JP 2015504050 A JP2015504050 A JP 2015504050A JP 2014549469 A JP2014549469 A JP 2014549469A JP 2014549469 A JP2014549469 A JP 2014549469A JP 2015504050 A JP2015504050 A JP 2015504050A
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Abstract
Description
アポトーシスは、遺伝的にプログラムされた細胞死であり、その脱制御は、いくつかある病理の中で特に癌と関連する。アポトーシスはBcl−2ファミリーメンバーおよびカスパーゼに依存していることが知られているが、最近のデータによって、セリン/スレオニンホスファターゼの2つの主要なファミリーであるPP1およびPP2Aが、細胞生存または細胞死の決定に関与する重要な因子であることが示唆された。Ser/ThreホスファターゼPP2Aは、アポトーシスの誘導および防止の両方に関与し、ホスファターゼ作用の複雑な相互作用を示す。いくつかのホスファターゼは、最近、癌を含む種々の疾患の処置のための魅力的な標的となっている。しかしながら、ホスファターゼを標的とする臨床薬は、免疫抑制性シクロスポリンAおよびFK506のみである。
本願の変異ペプチドは、ヒト血清プロテアーゼにより消化されないため、この問題を解消する。該新規特性は、注入されるペプチドの用量ならびに投与スケジュールを減少させることを可能にさせる。
[式中、X1は存在しない(vacant)か、リジン残基、またはバリン−リジンであり;
X2は存在しないか、リジン残基、またはリジン−イソロイシンであり;
X3は存在しないか、または1から4つのアミノ酸からなるアミノ酸配列であり;
Ψはアルギニンと異なっているアミノ酸残基である]
または1つ以上の化学修飾によって配列(I)から得られるタンパク質分解耐性のペプチド、または1つ以上の保存的置換によって配列(I)から得られる実質的に同種のペプチドを含むペプチドを提供する。
本発明者らは、WO2010/112471に記載されているペプチド、特にプロテアーゼによる分解に付されるペプチドDPT−C9hの安定性を改善するために研究した。該ペプチドは、PP2Aに対するカスパーゼ−9の結合部位の配列と結合している透過性ペプチドに対応する。該ペプチドはヒト細胞系においてアポトーシスを誘導する。加えて、それは、健常細胞に対する効果無しに、慢性リンパ性白血病患者から単離された腫瘍性B細胞においてのみ特異的なアポトーシス性効果を有する。加えて、該ペプチドは、ヒト乳癌異種移植片を有するマウスに注入されたとき、重要な腫瘍サイズの減少を誘導する。
[式中、X1は存在しないか、リジン残基、またはバリン−リジンであり;
X2は存在しないか、リジン残基、またはリジン−イソロイシンであり;
X3は存在しないか、または1から4つのアミノ酸からなるアミノ酸配列であり;
Ψはアルギニンと異なっているアミノ酸残基である]
を含むペプチドを設計した。
X1はバリン−リジンであり;
X2はリジン−イソロイシンであり;
X3は存在しない。
「患者」なる用語は、アポトーシス促進効果が望ましい処置を必要とするオス、メス、成体および幼体を含む、ヒトまたは非ヒト動物、好ましくは哺乳動物を示す。
本明細書に記載されているペプチドは、当業者に知られている標準合成方法、例えば化学合成または遺伝子組換えを使用して合成することができる。好ましい態様において、ペプチドは、縮合中にペプチド結合に関与する官能基を除いて、アミノ酸官能基を保護しながら、適当な順番にアミノ酸配列をすでに含むあらかじめ形成されたフラグメントの縮合、または以前に調製されたいくつかのフラグメントの縮合のいずれかによる、アミノ酸残基の段階的縮合により得られる。特に、ペプチドは、Merrifieldにより最初に記載された方法にしたがって合成することができる。
ペプチド
Y−X4a−ETLD−X4b−I−X5−EQWA−X6−S−X7(配列番号:3)
[式中、
X4aはバリンまたはイソロイシンであり;
X4bはアスパラギン酸またはグリシンであり;
X5はフェニルアラニンまたはロイシンであり;
X6はアルギニンまたはヒスチジンであり;
X7は存在しないか、またはグルタミン酸、またはグルタミン酸−アスパラギン酸、またはグルタミン酸−アスパラギン酸−ロイシンである];または
1つ以上の化学修飾によって該アポトーシス促進性ペプチドから得られるタンパク質分解耐性のペプチド、または1つ以上の保存的置換によって配列番号:3から得られる実質的に同種のペプチドを含むか、または該配列または該ペプチドからなる。
X4aはバリンであり;
X4bはアスパラギン酸であり;
X5はフェニルアラニンであり;
X6はヒスチジンである。
本明細書においてMut3−DPT−C9hとも称される
VKKKKIKAEIKI−YVETLDDIFEQWAHSEDL(配列番号:4)
である。
VKKKKIKAEIKI−YIETLDDILEQWARSEDL(配列番号:5)
である。
本明細書においてMut1−DPT−C9hとも称される
VKKKKIKKEIKI−YVETLDDIFEQWAHSEDL(配列番号:12)
である。
VKKKKIKKEIKI−YIETLDDILEQWARSEDL(配列番号:13)
である。
本明細書においてMut2−DPT−C9hとも称される
VKKKKIKNEIKI−YVETLDDIFEQWAHSEDL(配列番号:14)
である。
VKKKKIKNEIKI−YIETLDDILEQWARSEDL(配列番号:15)
である。
a)アミノ酸配列DTLDHIRALDRLQEVPHEGP(配列番号:8);
b)細胞アポトーシスを誘導する、配列番号:8と実質的に同種の、好ましくは配列番号:8と少なくとも80%同一のアミノ酸配列;または
c)細胞アポトーシスを誘導し、1つ以上の化学修飾によってa)またはb)に定義されるペプチドから得られるタンパク質分解耐性のペプチド
を含むか、または該配列または該ペプチドからなる、PP2Ahペプチドである。
である。
である。
である。
本明細書に記載されているペプチドのN−およびC−末端は、所望により、タンパク質分解に対して保護され得る。例えば、N−末端はアセチル基の形であってよく、および/またはC−末端はアミド基の形であってよい。タンパク質分解に対する耐性を示すペプチドの内部修飾もまた想定される、例えば、少なくとも−CONH−ペプチド結合は、(CH2NH)還元結合、(NHCO)レトロ−インベルソ(retro-inverso)結合、(CH2−O)メチレン−オキシ結合、(CH2−S)チオメチレン結合、(CH2CH2)カルバ結合、(CO−CH2)セトメチレン(cetomethylene)結合、(CHOH−CH2)ヒドロキシエチレン結合)、(N−N)結合、E−アルセン(alcene)結合またはまた−CH=CH−結合により修飾および置き換えされている。
本発明はまた、本発明のペプチドをコードするヌクレオチド配列を含むか、または該配列からなるポリヌクレオチドに関する。
本明細書において定義されているキメラペプチド、または該ペプチドをコードする核酸は、インビトロまたはインビボでの細胞増殖の阻害のために有用である。
本発明のベクター、特にキメラペプチド(または該ペプチドをコードする核酸)は、静脈内、経口、経皮、皮下、粘膜、筋肉内、肺内、鼻腔内、非経口、経直腸、膣内および局所を含む任意の便利な経路により投与され得る。鼻腔内経路が、特に興味深いものである。
1.1.材料および方法
ペプチド合成および配列
ペプチドを、固相処理および標準Fmoc化学にて、自動多重(multiple)ペプチドシンセサイザーにおいて合成した。ペプチドの純度および組成を、逆相HPLCおよびアミノ酸分析により確認した。
ペプチド分解の分析を、以前に記載されているとおりProteominerおよびMaldi−Tofにより行った。
DPT−C9hは
R残基を、K(Mut1−DPT−C9h)、N(Mut2−DPT−C9h)またはA(Mut3−DPT−C9h)に変異させた。
2.1.材料および方法
細胞
ヒト乳癌HBCx−12A細胞系を、原発性ヒト癌異種移植片から単離し、10%のFCSを補ったRPMI培地において培養した。
製造業者により述べられているAnnexin−V(BD biosciencesからの−FITC)を使用して、アポトーシス性細胞を検出した。簡潔には、細胞を1x結合バッファーで洗浄し、遠心し、200μlのAnnexinV−FITC(0.1μg/ml)およびPI(0.5μg/ml)を含む1x結合バッファーに再懸濁した。室温で暗下で10分間インキュベーション後、細胞をフローサイトメトリーにより分析した。FACSCalibur(BD biosciences)により得られたデータをCellquest Pro ソフトウェアで分析した。
次に、本発明者らは、変異ペプチドがアポトーシスを誘導する能力を保持するか否かを分析した。乳癌細胞系HBCx−12Aを100μMのコントロールおよび変異ペプチドで24時間処理した。アポトーシスをアネキシン−V−FITC染色により分析した。図2に示されるとおり、分析されたペプチドは、同レベルのアポトーシスを誘導する。同じ結果が、細胞系HBC−x3およびHBCx−17を使用したとき観察された。
3.1.材料および方法
ペプチド合成および配列
ペプチド(DPT−C9hおよびMut3DPT−C9h)を、上記のとおりに合成した。フルオロクロム Cy5をペプチドの合成中に加えた。
マウスに、ペプチドCy5DPT−C9hまたはMut3DPT−C9h(5mg/kg)をIP(腹腔内)注入し、次に、注射後の種々の時間に分析した。
乳癌異種移植モデルにおけるMut3DPT−C9hおよびDPT−C9hの生体内分布
本発明者らは、両方のペプチドの生体内分布を分析すること、および比較することにおいて興味があった。図3は、乳癌異種移植モデルにおけるCy5DPT−C9hおよびCy5Mut3DPT−C9hの生体内分布を示す。マウスに腹腔内(IP)注射し、注射に基づいて種々の時間に生体内分布を分析した。
Claims (18)
- 以下のアミノ酸配列(I):
[式中、X1は存在しない(vacant)か、リジン残基、またはバリン−リジンであり;
X2は存在しないか、リジン残基、またはリジン−イソロイシンであり;
X3は存在しないか、または1から4つのアミノ酸からなるアミノ酸配列であり;
Ψはアルギニンと異なっているアミノ酸残基である];
または1つ以上の化学修飾によって配列(I)から得られるタンパク質分解耐性のペプチド、または1つ以上の保存的置換によって配列(I)から得られる実質的に同種のペプチドを含むペプチド。 - Ψがアルギニンに対して非保存性であり、好ましくはアラニンである、請求項1に記載のペプチド。
- X1がバリン−リジンであり;
X2がリジン−イソロイシンであり;
X3が存在しない、
請求項1または2のいずれかに記載のペプチド。 -
である、請求項3に記載のペプチド。 -
- 興味ある分子と結合している、細胞透過性ペプチドとしての、請求項1から5のいずれかに記載のペプチドを含むベクター。
- アポトーシス促進性ペプチドに融合された、細胞透過性ペプチドとしての、請求項1から5のいずれかに記載のペプチドを含むキメラペプチド構築物である請求項6に記載のベクターであって、該細胞透過性ペプチドは好ましくはアポトーシス促進性ペプチドのN−末端で融合されている、ベクター。
- アポトーシス促進性ペプチドが、
Y−X4a−ETLD−X4b−I−X5−EQWA−X6−S−X7(配列番号:3)
[式中、
X4aはバリンまたはイソロイシンであり;
X4bはアスパラギン酸またはグリシンであり;
X5はフェニルアラニンまたはロイシンであり;
X6はアルギニンまたはヒスチジンであり;
X7は存在しないか、またはグルタミン酸、またはグルタミン酸−アスパラギン酸、またはグルタミン酸−アスパラギン酸−ロイシンである];または
1つ以上の化学修飾によって該アポトーシス促進性ペプチドから得られるタンパク質分解耐性のペプチド、または1つ以上の保存的置換によって配列番号:3から得られる実質的に同種のペプチドを含む、請求項7に記載のキメラペプチド構築物。 - X4aがバリンであり;
X4bがアスパラギン酸であり;
X5がフェニルアラニンであり;
X6がヒスチジンである、
請求項8に記載のキメラペプチド構築物。 - VKKKKIKAEIKI−YVETLDDIFEQWAHSEDL(配列番号:4)または
VKKKKIKAEIKI−YIETLDDILEQWARSEDL(配列番号:5)
である、請求項9に記載のキメラペプチド構築物。 - アポトーシス促進性ペプチドが:
a)アミノ酸配列DTLDHIRALDRLQEVPHEGP(配列番号:8);
b)細胞アポトーシスを誘導する、配列番号:8と実質的に同種の、好ましくは配列番号:8と少なくとも80%同一のアミノ酸配列;または
c)細胞アポトーシスを誘導し、1つ以上の化学修飾によってa)またはb)に定義されるペプチドから得られるタンパク質分解耐性のペプチド
を含むか、または該配列または該ペプチドからなる、請求項7に記載のキメラペプチド構築物。 - アポトーシス促進性ペプチドが、配列DTLDHIRALDRLQEVPHEGP(配列番号:9)を含むか、または該配列からなる、請求項11に記載のキメラペプチド構築物。
- VKKKKIKAEIKI−DTLDHIRALDRLQEVPHEGP(配列番号:16)
VKKKKIKKEIKI−DTLDHIRALDRLQEVPHEGP(配列番号:17)
および
VKKKKIKNEIKI−DTLDHIRALDRLQEVPHEGP(配列番号:18)
からなる群から選択される、請求項12に記載のキメラペプチド構築物。 - 請求項1から5のいずれかに記載のペプチドまたは請求項7から13のいずれかに記載のキメラペプチド構築物をコードする配列を含む核酸。
- インビボまたはエキソビボでの遺伝子治療または遺伝子導入における使用のための、(ii)興味あるヌクレオチド配列、と結合している、(i)請求項1から5のいずれかに記載のペプチドをコードするヌクレオチド配列、を含む核酸を含むベクター。
- インビトロでの細胞増殖の阻害のための、請求項7から13のいずれかに定義のキメラペプチド構築物、または該キメラペプチド構築物をコードする核酸の使用。
- 請求項15に定義のベクター、または請求項7から13のいずれかに定義のキメラペプチド構築物を、薬学的に許容される担体と一緒に含む、医薬組成物。
- 過増殖性疾患または寄生虫疾患を処置することにおける使用のための医薬組成物であって、該過増殖性疾患は、好ましくは
−(i)乾癬、良性前立腺肥大、リウマチ性関節炎、炎症性腸疾患、骨関節症、平滑筋腫、腺腫、脂肪腫、血管腫、線維腫、血管閉塞、再狭窄、アテローム性動脈硬化症、および口腔毛状白板症からなる群から選択される非癌性過増殖性疾患、および/または
−(ii)急性骨髄性白血病、慢性リンパ性白血病、多発性骨髄腫、ホジキン病、非ホジキンリンパ腫、B細胞、皮膚T細胞リンパ腫、および脳、肺、乳房、卵巣、頭頸部、膀胱、胃、膵臓、頭、首、腎臓、前立腺、結腸直腸、食道および甲状腺癌、ブドウ膜黒色腫および黒色腫からなる群から選択される癌;
であり、
該過増殖性疾患は、好ましくは腫瘍、好ましくはヒト患者における癌腫瘍、さらに好ましくはリンパ腫、よりさらに好ましくは慢性リンパ性白血病(CLL)であり、
該寄生虫疾患は、好ましくはトリパノソーマ(Trypanosoma)、タイレリア(Theileria)またはマラリア原虫(Plasmodium)から選択される寄生生物での感染による、請求項17に記載の医薬組成物。
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