JP2012518410A - 癌標的ペプチドおよび癌の治療におけるこれの使用 - Google Patents
癌標的ペプチドおよび癌の治療におけるこれの使用 Download PDFInfo
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- JP2012518410A JP2012518410A JP2011551230A JP2011551230A JP2012518410A JP 2012518410 A JP2012518410 A JP 2012518410A JP 2011551230 A JP2011551230 A JP 2011551230A JP 2011551230 A JP2011551230 A JP 2011551230A JP 2012518410 A JP2012518410 A JP 2012518410A
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Abstract
Description
本願は、2009年2月19日に出願された米国仮特許出願第61/153,725号に対して優先権を主張するものであり、この内容は参考で全体を本明細書中に引用される。
標的ドラッグデリバリーによって、癌の治療の有効性が顕著に改善される。癌細胞を特異的に標的にする薬剤を同定することが、この目的を達成するための鍵となる。
本発明は、QNIYAGVPMISF(配列番号:1)、EATNSHGSRTMG(配列番号:2)、TVSWSTTGRIPL(配列番号:3)、QLEFYTQLAHLI(配列番号:4)、及びSMDPFLFQLLQL(配列番号:5)を含む、数多くのペプチドが、特異的に乳癌細胞を標的とし、これにより乳癌部位に薬剤を容易にデリバリーできるという予想できないような発見に基づくものである。
まず、図面を説明する。
本発明は、数多くの乳癌標的ペプチド、即ち、配列番号:1〜5のアミノ酸配列の一を含むペプチドに関するものである。本明細書中で使用される「ペプチド」ということばは、ペプチド結合連結(peptide bond linkage)を介した100個以下のアミノ酸モノマーから構成されるポリマーを意味する。本明細書に記載される各乳癌標的ペプチドは、50個以下(例えば、30個)のアミノ酸を有していてもよい。これらのペプチドは、公知の方法、即ち、化学合成または組換技術によって調製できる。
BT483細胞(乳癌細胞)およびヒト粘膜上皮細胞(正常細胞)を、Lo et al., Mol. Cancer Ther 7:579-589 (2008)およびLee et al., Cancer Res. 64:8002-8008 (2004)に記載される方法に従って、96ウェルプレートに播種した。これらの細胞を、紫外線によって不活性化されるコントロールヘルパーファージ及び以下に列挙される5種の試験ファージのうちの一つ双方と共にインキュベートし、この際、それぞれは、下記に列挙される5種のペプチドの一つを発現する。
1×107個のBT483細胞をSCIDマウスの背側の脇腹の皮下に(s.c.)注射して、乳癌異種移植片を誘導した。約300mm2の大きさの異種移植片腫瘍を有するマウスに、上記実施例1に記載される5種のファージの一つ(109pfu)またはコントロールファージを静脈内に(i.v.)投与した。灌流後、異種移植片腫瘍及び器官(即ち、脳、心臓、及び肺)を各マウスから除去して、均質化した。Lee et al., Cancer Res. 67:10958-10965 (2007)およびLo et al., Mol. Cancer Ther 7:579-589 (2008)に記載される方法に従って、各組織サンプルに結合したファージを溶出し、ER2738細菌細胞を宿主として用いて回収し、IPTG/X−Gal寒天平板上で力価を測定した(titered)。
ペプチドSMDPFLFQLLQL(配列番号:5)を発現する、ファージクローンPC90のインビボでの癌標的活性を以下のようにして試験した。新鮮な乳癌組織サンプルを、浸潤乳癌(mammary infiltrating ducal carcinoma)を有する20人の患者から得た。各組織サンプルを4μmにスライスし、1%パラホルムアルデヒド中で固定した。次に、スライスした組織サンプルをPC90またはコントロールファージと共にインキュベートした。1%Tween20を含むPBS(PBST0.1)で洗浄した後、サンプルを、室温で1時間、抗M13マウスmAb(Amersham Biosciences, Piscataway, NJ, USA)と共にインキュベートし、PBST0.1で再度洗浄し、各サンプルの免疫反応性を、Lee et al. (2004)及びLo et alに記載される方法に従って、ビオチンを含まない超感受性ポリマー−HRP検出システム(biotin-free super sensitive polymer-HRP detection system)(Biogenex, San Ramon, CA, USA)を用いて測定した。組織サンプルが結合した、スライドを、ヘマトキシリンで対比染色し、Aquatex(Merck, Dannstadt, Germany)を載せ(mounted)、光学顕微鏡で調べた。陽性に染色した細胞の割合(%)を、Hall et al., J. Pathol. 172:1-4 (1994)に記載される方法に従って測定した。本研究では、コントロールファージではなく、PC90が、組織サンプルの腫瘍細胞を標的としたことが分かった。
ペプチドが共役したドキソルビシン封入リポソームの調製
ドキソルビシンを含むペプチド共役リポソーム(peptide-conjugated liposome)を、Lee et al. (2007)、Lo et al、及びLee et al. (2004)に記載されるようにして調製した。簡単にいうと、ペプチドを、1:1.5のモル比で、NHS−PEG−DSPE[N−ヒドロキシスクシンイミド−カルボキシル−ポリエチレングリコール(MW、3400)−由来ジステアロイルホスファチジルエタノールアミン(N-hydroxysuccinimido-carboxyl-polyethylene glycol (MW, 3400)-derived distearoylphosphatidyl ethanolamine)](NOF Corporation, Japan)にカップリングさせた。反応を終了し、TNBS(トリニトロベンゼンスルホネート(Trinitrobenzenesulfonate))(Sigma, MO, USA)を用いて非反応アミノ基を定量することによって確認した。ドキソルビシンを、10μモルのリン脂質当たり1mgの薬剤の割合でリポソームによって封入した。次に、ペプチジル−PEG−DSPE(peptidyl-PEG-DSPE)を、脂質2層の転移温度で一緒にインキュベートした後、ドキソルビシンを封入したリポソームに共役させた。得られたペプチド共役リポソームはそれぞれ、Kirpotin, et al., Biochemstry, 36: 66-75 (1997)に記載される方法によって測定した際に、約500ペプチド分子を含んだ。この方法に従って、SP90共役ドキソルビシン封入リポソーム(SP−LD)及びコントロールペプチド共役ドキソルビシン封入リポソーム(CP−LD)を調製した。
BT483細胞を、37℃で5分間、SP−LDまたはCP−LDと共にインキュベートした。次に、この細胞をPBSで洗浄し、固定し、さらに電子顕微鏡下で調べて、細胞エンドソームにおけるリポソームの内在化を検出した。結果から、SP−LDと共にインキュベートした細胞では、リポソームがこれらのエンドソームの約90%中に内在化していることが分かったが、CP−LDと共にインキュベートした細胞では、これらのエンドソームの約51%のみがリポソーム陽性であったことが示される。これから、SP−LDが乳癌細胞によるリポソームのエンドサイトーシスを仲介したことが示される。
1×107個のBT483細胞をSCIDマウス(4〜6週齢)の背側の脇腹の皮下に(s.c.)注射して、乳癌異種移植片を誘導した。これらのマウスの腫瘍容積は、式:長さ×(幅)2×0.52によって測定した。約50〜100mm3の大きさの異種移植片腫瘍を有するマウスを任意に4グループに分けて、各グループを、以下のように尾静脈による投与によって処置した。
グループ2:週に1回3週間、3mg/kgのドキソルビシン投与量で、ドキソルビシンを含むリポソーム(LD)で処置、
グループ3:週に1回3週間、3mg/kgのドキソルビシン投与量で、遊離ドキソルビシン(FD)で処置、
グループ4:週に1回3週間、生理食塩水で処置(ブランクコントロール)。
本明細書中に開示されるすべての特徴は、いずれの組み合わせで組み合わせてもよい。本明細書中に開示される各特徴は、同じ、等価の、または同様の目的を果たす別の特徴で置換されてもよい。ゆえに、特記しない限り、開示される各特徴は、包括的な一連の等価のまたは同様の特徴の一例でしかない。
Claims (11)
- QNIYAGVPMISF(配列番号:1)、
EATNSHGSRTMG(配列番号:2)、
TVSWSTTGRIPL(配列番号:3)、
QLEFYTQLAHLI(配列番号:4)、および
SMDPFLFQLLQL(配列番号:5)
からなる群より選択されるアミノ酸配列を有する、乳癌標的ペプチド(breast cancer-targeting peptide)。 - 配列番号:1、2、3、4、または5のアミノ酸配列を有する、請求項1に記載のペプチド。
- 配列番号:5のアミノ酸配列を含む、請求項1に記載のペプチド。
- 配列番号:5のアミノ酸配列を有する、請求項3に記載のペプチド。
- 請求項1〜4のいずれか1項に記載のペプチドおよび抗癌剤を有する、抗癌剤共役体(anti-cancer conjugate)。
- 前記ペプチドが、抗癌剤を封入する微粒子と連結する(associated with)、請求項5に記載の共役体。
- 前記微粒子がリポソームである、請求項6に記載の共役体。
- 前記抗癌剤が、ドキソルビシン、タモキシフェン、酒石酸ビノレルビン(vinorelbine)、ビンクリスチン、パクリタキセル、ルートテカン(Lurtotecan)、ドセタキセル、アドリアマイシン、エピルビシン、ミトキサントロン、マイトマイシン、ゲムシタビン(gemcitabine)、シスプラチン、オキサリプラチン(oxaliplatin)、ビンブラスチン、5−FU、UFUR、アナストロゾール、レトロゾール、エキセメスタンからなる群より選択される、請求項5〜7のいずれか1項に記載の共役体。
- 抗癌剤を乳癌部位にデリバリーするための請求項5〜8のいずれか1項に記載の癌標的共役体の使用。
- 乳癌の治療のための薬剤の製造における請求項5〜8のいずれか1項に記載の癌標的共役体の使用。
- 請求項1〜4のいずれか1項に記載のペプチドをコード化するヌクレオチド配列を有する、核酸。
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