JP5534630B2 - Gd3模倣ペプチド - Google Patents
Gd3模倣ペプチド Download PDFInfo
- Publication number
- JP5534630B2 JP5534630B2 JP2001124504A JP2001124504A JP5534630B2 JP 5534630 B2 JP5534630 B2 JP 5534630B2 JP 2001124504 A JP2001124504 A JP 2001124504A JP 2001124504 A JP2001124504 A JP 2001124504A JP 5534630 B2 JP5534630 B2 JP 5534630B2
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- peptide
- antibody
- present
- amino acid
- mimetic
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Description
(b) 配列番号:5から8のいずれかに示される配列を有する上記DNA配列;
(c) これらDNA配列の少なくとも1種が挿入された組換え体発現ベクター;
(d) 上記組換え体発現ベクターを組込んだ宿主細胞;
(e) 上記組換え体発現ベクターを有効成分として含有する医薬組成物;
(f) 抗GD3抗体の誘起を刺激するかまたは該抗体の産生を増強するためのワクチンとしての本発明医薬組成物の使用;
(g) 抗腫瘍、抗癌または癌転移抑制のための医薬としての本発明医薬組成物の使用;
(h) GD3発現性の腫瘍または癌、特に、黒色腫、大腸癌、卵巣癌、肝癌、乳癌、脳腫瘍、腎癌、膵臓癌、子宮頸癌、食道癌、肺癌および胃癌からなる群から選ばれる疾患の処置である上記医薬組成物の使用;
(i) リポソーム製剤である本発明医薬組成物。
本発明のGD3模倣ペプチドは、配列番号:1から4のいずれかに示されるアミノ酸配列を含むペプチドまたは該アミノ酸配列において1もしくは複数のアミノ酸残基が置換、欠失、付加もしくは挿入により改変されたアミノ酸配列を含むペプチドからなり、GD3に対する抗体(抗GD3抗体)に特異的な結合性を有することにより特徴付けられる。
(a)配列番号:1から4に示される特定アミノ酸配列(それらの改変されたアミノ酸配列を含む、以下同じ)の少なくとも1種が複数個融合または連結された配列を含むペプチド;
(b)前記特定アミノ酸配列の少なくとも1種のペプチドを含む多抗原性ペプチド形態のペプチド;
(c)前記特定アミノ酸配列の少なくとも1種のペプチドと免疫原性を高めるかもしくは免疫応答を促進し得るキャリア蛋白乃至ペプチドとの融合ペプチド形態のペプチド。
認識する抗体、好ましくはGD3に対する特異性に優れるモノクローナル抗体を利用して、該抗体への結合性を試験することにより行い得る。
本発明GD3模倣ペプチドの製造
本発明GD3模倣ペプチドは、そのアミノ酸配列に従って、一般的な化学合成法により製造することができる。該方法には、通常の液相法および固相法によるペプチド合成法が包含される。
に示される特定アミノ酸配列のペプチドの複数個が結合した形態として特徴付けられる。
例えば前記したペプチド合成法に従い製造することができる。また、例えばFmoc8-Lys4-Lys2-Lys-βAla-Alko樹脂(渡辺化学工業社製)などとして市販のデンドリマー原料を利用して製造することもできる。
本発明医薬組成物
本発明は、本発明GD3模倣ペプチドを有効成分として含有するヒトを含む動物のための医薬組成物をも提供する。
本発明GD3模倣ペプチドをコードするDNA
本発明は、本発明GD3模倣ペプチドをコードするDNA配列のDNA自体をも提供する。該DNAは、前記した本発明GD3模倣ペプチドの遺伝子工学的手法による製造に有用である。また、該DNAはこれを有効成分とするDNAワクチンの調製にも好適に利用することができる。
本発明抗体
本発明GD3模倣ペプチドは、これを抗原として新たな抗体、即ち、GD3に結合性を有し、それ故、GD3を発現する例えば悪性腫瘍細胞(メラノーマ細胞など)に結合して、該細胞の増殖を抑制したり、転移を抑制する活性を発揮する抗体(中和抗体)を製造することができる。本発明はかかる抗体をも提供する。
TBS:トリスリン酸生理食塩水緩衝液
TC:テトラサイクリン
KM:カナマイシン
PEG/NaCl:ポリエチレングリコール/塩化ナトリウム
TFA:トリフルオロ酢酸
(1)ファージディスプレイライブラリーの調製
ニシ、サヤらの報告(Nishi T., Saya H., et al., FEBS Letter, 399, 237-240 (1996))に従って、ファージのコートタンパク質pIII遺伝子に15残基のランダムなアミノ酸配列ペプチドをコードするランダムDNAを挿入して、ファージ外殻表面にランダムな15残基のアミノ酸配列ペプチドを発現できるファージディスプレイライブラリーを構築した。
抗GD3抗体として、抗GD3モノクローナル抗体(4F6)(以下、4F6抗体という)を使用した。4F6抗体は、GD3に対するマウスモノクローナル抗体(IgG)であり(Thomas C. P., et al., Glycoconj. J., 13 (3), 377-384 (1996))、ポートカリアン博士(Dr. Jacques Portoukalian; INSERM, France)より譲渡を受けた。
ファージの宿主大腸菌として、大腸菌K91KAN(カナマイシン耐性株:熊本大学・腫瘍医学講座、佐谷秀幸教授より分与)を使用した。
前記(1)で得られたファージを宿主大腸菌に感染させた。即ち、各ファージ希釈溶液10μlと上記調製済み大腸菌 K91KAN10μlを15ml遠心チューブに加えて室温で15分間反応させた後、予め37℃に加温しておいたNZY培地(0.2μg/ml TCを含む)1mlを加え、37℃、2000回転/分で40分間振とう培養した。各々のチューブから、200μlをNZYプレート(20μg/ml TC、100μg/ml KMを含む)に蒔き、37℃、一晩培養し、翌日コロニーの数を測定した。
103倍希釈=102倍希釈ファージ溶液10μl+TBS/ゼラチン90μl
104倍希釈=102倍希釈ファージ溶液 2μl+TBS/ゼラチン198μl
106倍希釈=104倍希釈ファージ溶液 2μl+TBS/ゼラチン198μl
107倍希釈=106倍希釈ファージ溶液10μl+TBS/ゼラチン90μl
108倍希釈=106倍希釈ファージ溶液 2μl+TBS/ゼラチン198μl
109倍希釈=108倍希釈ファージ溶液10μl+TBS/ゼラチン90μl
ファージタイターの計算方法は以下の通りである。
また、回収されたファージの総タイターは、上記の値に回収された溶液の総量(ml)を掛けることで算出した。
4F6抗体に特異的に結合するペプチドを発現しているファージクローンの選択(バイオパニング)を以下の通り実施した。即ち、4F6抗体のFab領域に結合するファージを効率よく得るために、予め標準マウスIgGおよび組換えプロティンAセファロースに結合するファージを排除した後、4F6抗体とファージライブラリーとを反応させた。
標準マウスIgG-組換えプロティンAセファロース10μlおよび組換えプロティンAセファロース50μlをPBS340μlに溶解し、ファージライブラリー10μl(6.2×1010タイター)を添加し、500μlエッペンドルフ・チューブにて、4℃一晩反応させた後、30000回転/分、3分間遠心分離し、予め、標準マウスIgGおよび組換えプロティンAセファロースに結合するファージを排除した。
上記第1ラウンドで得た増幅させたファージ100μlと標準マウスIgG-組換えプロティンAセファロース10μl(25μg)をPBSの350μlに溶解し、500μlエッペンドルフ・チューブに加えて、4℃一晩反応させた後、組換えプロティンAセファロース50μlを加えて、4℃一晩反応させた。3000回転/分、3分間遠心分離して上清500μlを得た。
上記第2ラウンドで増幅させたファージ100μlを用い、第1ラウンドの方法に準じた手順でファージを抗4F6抗体溶液と反応させて増幅したファジーを得た。このようにして得られ、セントリコンによる遠心分離で回収された溶出液の総量は110μlであった。
内の水分を蒸発させ、沈殿しているDNAを10μlの滅菌蒸留水に溶解し、4℃にて保存した。
ファージDNAによりコードされるペプチドのアミノ酸配列の決定は、パーキンネルマー社のDNAシークエンスキット(DNA Sequence Kit, Perkin Elmer, Code; 402079, Lot; A6L015)を用いて、該キットに添付の仕様書に準じて、ダイターミネーター法により実施した。用いたプライマーのDNA配列は、配列番号:9に示されるとおりであり、これは自動DNA合成機で合成した。
実施例1で得た各ファージクローン1011、1010および109タイター/100μl-0.1M NaHCO3溶液を、96穴マイクロタイタープレート(ヌンク社製)に添加し、室温にて1時間固定した。上清を除き、400mlのブロッキング溶液(1%BSA、0.1%スキムミルク、0.02%ツイーン20を含むTBS、pH7.5)を加え、37℃で4時間ブロッキングを行った。
(1)GD3模倣ペプチドの合成
実施例1で同定した4種のGD3模倣ペプチドのそれぞれを以下の方法により合成した。
上記で得たGD3模倣ペプチドの多抗原性ペプチド(MAP: multi antigen peptide)を、Fmoc-MAP-Alko樹脂(渡辺化学工業社製)を用いて合成した。
配列番号:1のペプチドのMAP:
(LAPPRPRSELVFLSV)8-Lys4-Lys2-Lys-βAla
配列番号:2のペプチドのMAP:
(PHFDSLLYPCELLGC)8-Lys4-Lys2-Lys-βAla
配列番号:3のペプチドのMAP:
(GLAPPDYAERFFLLS)8-Lys4-Lys2-Lys-βAla
配列番号:4のペプチドのMAP:
(RHAYRSMAEWGFLYS)8-Lys4-Lys2-Lys-βAla
(3)抗GD3抗体との結合親和性
上記で得たMAP形態の本発明GD3模倣ペプチド(GD3R-1, GD3R-2, GD3R-3およびGD3−R4)の0.1M NaHCO3溶液を100ng/100μlの濃度で96穴マイクロタイタープレー
トの各ウエルに添加し、室温にて1時間固定し、その後、実施例2のELISA法と同様の操作を行って、4F6抗体(抗GD3抗体)との結合親和性を調べた。
前記で得たGD3模倣ペプチドおよびそのMAPを用いて、KLHとの融合ペプチドを合成した。
(1)免疫:
実施例3の(2)で得たMAP形態の4種類のGD3模倣ペプチドをそれぞれ200μg/mlの濃度でPBSに溶解した。これをフロイント完全(または不完全)アジュヴァントと合わせて(1:1、容量比)エマルジョンを作製した。
上記(1)で得た各抗血清(3×8匹=24サンプル)のGD3に対する力価を、以下の通りELISA法により測定した。
(1)供試ペプチド
本試験で用いたペプチドの名称と配列(一文字表示による)を図2に示す。
図2に示す各アミノ酸配列のペプチドは、それぞれ実施例3の(1)と同様にして合成した。また実施例3の(3)と同様にして各ペプチドを多抗原性ペプチド(MAP)の形態に調製して、本試験に利用した。
図1に示す4F6抗体とGD3模倣ペプチドとの結合性を更に検討する目的で、上記(1)で調製した多抗原性ペプチド(MAP)を用いて、実施例2と同様にしてELISAを行った。
上記(2)で求めた抗体結合親和性(図2参照)を更に別の方法で検討した。
この試験では、GD3R3またはGD3R4と4F6抗体との結合が、該抗体のGD3結合部位で起こるかどうかを調べた。
様にして図5に示す。
GD3模倣ペプチドの4F6抗体との結合に必要なドメインを決定する目的で、GD3R3ペプチドおよびGD3R4ペプチドの各N端およびC端のそれぞれ9アミノ酸残基からなるペプチド(図2参照)をMAP形態で用いて、各MAPの4F6抗体との結合性を、実施例2に記載のELISA法に従って調べた。対照としてGD3およびGD2と4F6抗体との結合性を同様にして調べた。各試験はそれぞれ3回行い、結果を、図3-5と同様にして図6(平均値±SD)に示す。
(1)免疫:
実施例3の(4)で得たGD3R-4とKLHとの融合ペプチド(R4-KLH)またはMAP形態である該GD3R-4とKLHとの融合ペプチド(R4MAP-KLH)を用い、実施例5の(1)と同様にしてマウスを免疫した。
GD3またはGD3R-4ペプチドを固相化したELISAプレートを用いて、実施例4の(2)に準じて試験した。
(1)で免疫した各マウスの脾臓を無菌下に調製し、10%FCS加RPMI 1640培地中で細切した。ナイロンウールカラムにてT細胞富化リンパ球を調製して細胞をカウントした。105細胞/150μl上記培地を培養プレートの各ウエルに加え、PHAを終濃度1μg/mlとなるように添加した。
R4-KLHで免疫した抗血清とGD3との反応性を求めた結果を図7(縦軸:D0405nm、横軸:血清希釈倍率)に示す。
臓細胞の培養上清中でインキュベーションしたIL-R依存性CTLL2細胞への3H-チミジンの取り込みを求めた結果を下記表6に示す。
Claims (9)
- 配列番号:3〜4のいずれかに示されるアミノ酸配列からなるGD3模倣ペプチド。
- 請求項1に記載するGD3模倣ペプチドを有する多抗原性ペプチド形態のペプチドであって、抗GD3抗体に対する特異的結合性及び抗GD3抗体産生能を有することを特徴とする免疫原性ペプチド。
- 請求項1に記載するGD3模倣ペプチドまたは請求項2に記載する多抗原性ペプチド形態の免疫原性ペプチドと、免疫原性を高めるキャリア蛋白との融合ペプチドであって、抗GD3抗体産生能を有することを特徴とする免疫原性ペプチド。
- キャリア蛋白がキーホールリンペットヘモシアニンである請求項3に記載する免疫原性ペプチド。
- 請求項2乃至4のいずれかに記載する免疫原性ペプチドを有効成分として含有することを特徴とする医薬組成物。
- 抗腫瘍ワクチンである請求項5に記載する医薬組成物。
- 請求項2乃至4のいずれかに記載する免疫原性ペプチドを免疫抗原として製造される抗体。
- 請求項2乃至4のいずれかに記載する免疫原性ペプチドをコードするDNA。
- 配列番号:7〜8のいずれかに示される塩基配列を有する請求項8に記載するDNA。
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