JP2004166709A - 増加した生物学的活性を有する短縮型ケラチノサイト増殖因子(kgf) - Google Patents
増加した生物学的活性を有する短縮型ケラチノサイト増殖因子(kgf) Download PDFInfo
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- JP2004166709A JP2004166709A JP2004034289A JP2004034289A JP2004166709A JP 2004166709 A JP2004166709 A JP 2004166709A JP 2004034289 A JP2004034289 A JP 2004034289A JP 2004034289 A JP2004034289 A JP 2004034289A JP 2004166709 A JP2004166709 A JP 2004166709A
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Abstract
【解決手段】 単離されたポリペプチドであって、該ポリペプチドは成熟、完全長ヒトKGFのフラグメントであり、ここで該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加である、単離されたポリペプチド。
【選択図】 なし
Description
本発明は、一般にケラチノサイト増殖因子(「KGF」)に関する。さらに特定的に、本発明は、昆虫細胞系で発現する組換え完全長KGFと比較して、生物学的活性の増加および細胞毒の減少を有する短縮型KGFフラグメントおよびそのアナログに関する。このKGFフラグメントは、本明細書中ではKGFdes1−23と命名され、成熟完全長KGFのN末端の最初の23アミノ酸残基を欠損し、このN末端は、Finch,P.W.ら、Science 245:752−755(1989)に示され、そしてKGFにその上皮細胞特異性を与えると既に考えられているように、N末端からのアミノ酸残基14〜16にグリコシル化部位を含む。
KGFは、線維芽細胞成長因子(「FGF」)のファミリーに属し、塩基性FGF(「bFGF」)として示されるものの始原型である。このため、KGFはまた、FGF−6として公知である。他のFGFのように、KGFはヘパリン結合タンパク質であるが、他のFGFと異なり、それは独特な標的細胞特異性を有する。特に、FGFは、一般に、一次または二次中胚葉由来および神経外胚葉由来の種々の細胞型の増殖および分化を刺激し得る。KGFは、Finch,P.W.ら(上記引用文中)で考察されるように、上皮細胞増殖を刺激し得るその能力において他のFGFと同様であるが、内皮細胞または線維芽細胞の増殖を刺激し得ないその能力において他のFGFと同様でない。
本発明の目的の1つは、成熟完全長KGF、KGF163のアミノ酸配列の一部分を含み、そして完全長組換えKGF、rKGF163と比較して少なくとも2倍のマイトジェン活性の増加を有するKGFフラグメントを提供することである。特別な目的は、rKGF163の最初の23個のN末端アミノ酸残基C−N−D−M−T−P−E−Q−M−A−T−N−V−N−C−S−S−P−E−R−H−T−R−を含む配列を欠失しているKGFフラグメントを提供することである。
(b)毒性分子
を含有する結合体。
(b)薬剤的に許容し得るキャリアー
を含有する治療組成物。
本明細書中でKGFフラグメントまたはKGFdes1−23と称される、rKGF163の最初の23個のN末端アミノ酸残基にわたる欠失を有する短縮型非グリコシル化KGFが、rKGF163と比べて上皮細胞上でより大きな生物学的活性および細胞毒の減少を有することを驚くべきことに発見した。一般に、本発明のKGFフラグメントは、上皮細胞の増殖の刺激に対してKGF163の特異性を保持する。
本明細書で用いる用語「ケラチノサイト増殖因子」または「KGF」は、構造的に異なるタンパク質である線維芽細胞成長因子、FGFのファミリーに属するポリペプチドを意味し、このタンパク質は、それらが関連するファミリーの遺伝子にコードされていることを示唆する配列相同性の変化程度を呈示する。KGFは、本明細書の他の所に記載された特性を有し、例えば、FGFR−3に結合し、そして上皮細胞、特にケラチノサイトの成長を刺激し得る。完全長KGFは、163アミノ酸残基からなる。
(f.発現システム)
KGFフラグメントおよびそのアナログは、当業者に十分に理解されるように、KGFフラグメントまたはアナログをコードするDNA配列がベクターに適切な読み取り枠および方向で作動可能に連結される場合、組換え技術により発現され得る。KGFフラグメントを含む遺伝子構築物を作成する場合、好ましい出発材料は、KGFフラグメントをコードしているcDNAである。KGFフラグメントはまた、所望する場合、開裂され得るハイブリッドタンパク質として生産され得るが、典型的には、短縮型KGF遺伝子は、プロモーターより下流に挿入され得、そして後ろにターミネーター配列が続き得る。一般に、短縮型KGFおよび短縮型KGFポリペプチド誘導体の生産収量を改善する宿主細胞特異的配列が用いられ得、そして適切な制御配列、例えば、エンハンサー配列、ポリアデニル化配列、およびリボソーム結合部位が発現ベクターに付加され得る。一旦、適切なコーディング配列が単離されること、それは、種々の異なる発現系;例えば、哺乳動物細胞、バキュロウイルス、細菌、および酵母で使用され、発現され得る。これらは、以下に考察される。
哺乳動物発現系は、当該分野で公知である。哺乳動物プロモーターは、哺乳動物RNAポリメラーゼを結合し、そしてコーディング配列(例えば、構造遺伝子)のmRNAへの下流(3‘)転写を開始し得る任意のDNA配列である。プロモーターは転写開始領域、それは、通常コーディング配列の5’末端に隣接する位置にあり、および転写開始部位の25〜30塩基対(bp)上流に位置するTATAボックスを有し得る。 TATAボックスは、RNA合成を正しい部位で始めるために、RNAポリメラーゼIIに指示すると考えられている。動物細胞のプロモーターはまた、上流のプロモーター要素(典型的には、TATAボックスの100〜200bp上流内に位置する)を含み得る。上流のプロモーター要素は、転写が開始される速度を決定しどちらかの方向に作用し得る[Sambrookら、(1989)「哺乳動物細胞におけるクローン化遺伝子の発現。」Molecular Cloning:A Laboratory Manual,第2版]。
KGFをコードしているポリヌクレオチドは、安定な発現ベクター、例えば昆虫細胞発現ベクター中に挿入され得、そしてベクター内で制御要素に作動可能に連結され得る。ベクターの構築は、当該分野で公知の技術を使用して行われる。特に、本発明の目的のため、バキュロウイルス発現ベクターが、Kittsら、BioTechniques 14:810−817(1993)に実質的に従って構築される。
細菌発現技術は当該分野で公知である。細菌プロモーターは、細菌RNAポリメラーゼを結合し得、そしてコーディング配列(例えば、構造遺伝子)のmRNAへの下流(3”)転写を開始し得る任意のDNA配列である。プロモーターは、通常コーディング配列の5’末端に隣接して位置する転写開始領域を有する。この転写開始領域は、典型的には、RNAポリメラーゼ結合部位および転写開始部位を含む。細菌プロモーターはまた、オペレーターと呼ばれる第二ドメインを有し得、それは、RNA合成が開始する隣接したRNAポリメラーゼ結合部位とオーバーラップし得る。遺伝子リプレッサータンパク質がオペレーターに結合し得、そしてそれによって特異的な遺伝子の転写を阻害し得るので、オペレーターは、ネガティブに調節された(誘導可能な)転写を可能にする。構成的な発現は、オペレーターのようなネガティブな調節要素の非存在下で生じ得る。さらに、ポジティブな調節は、遺伝子活性化タンパク質結合配列により達成され得、それが存在する場合は、通常、RNAポリメラーゼ結合配列に隣接する(5’側)。遺伝子活性化タンパク質の例は、カタボライトアクチベータータンパク質(CAP)であり、それは、Escherichia coli(E.coli)においてlacオペロンの転写開始を助ける[Raibaudら、(1984)Annu.Rev.Genet.18:173]。従って、調節された発現は、ポジティブまたはネガティブのいずれか、それにより転写促進または減少のいずれであり得る。
DNA分子は細胞内に発現され得る。プロモーター配列はまた、DNA分子と直接結合し得、この場合、N末端の最初のアミノ酸は常にメチオニンであり得、メチオニンはATG開始コドンによりコードされる。所望する場合、N末端のメチオニンは、臭化シアンとともにインビトロでインキュベーションすること、もしくは細菌メチオニンN末端ペプチダーゼとともにインビボまたはインビトロのいずれかでインキュベーションすることによりタンパク質から開裂され得る(EPO公開第219237号)。
酵母発現系がまた当業者に公知である。酵母プロモーターは、酵母RNAポリメラーゼを結合し得、かつmRNAにコーディング配列(例えば、構造遺伝子)の下流(3’)転写を開始し得る任意のDNA配列である。プロモーターは、通常コーディング配列の5’末端に近接して位置する転写開始領域を有する。この転写開始領域は、典型的には、RNAポリメラーゼ結合部位(「TATA Box」)および転写開始部位を含む。酵母プロモーターはまた、上流アクチベーター配列と呼ばれる第2ドメインを有し、存在する場合、それは、通常、構造遺伝子の遠方にある。UASは、調節(誘導可能)発現を可能にする。構成的な発現はUASの非存在下で起こる。調節発現は、ポジティブまたはネガティブのいずれかであり得、それによって転写の促進または減少のいずれかであり得る。
図1に示す通り、cDNAをpAcC13Pst/Not 1発現ベクターにクローニングすることによって、ヒトKGF cDNAをバキュロウイルス発現系に挿入した。Munemitsuら Mol.Cell.Biol.10:5977−5982(1990)に記載の通り、このプラスミドはpAcC12に由来した。
Spodoptera Frugiperda(Sf9昆虫細胞)に、KGF1−163に対するcDNAを含むバキュロウイルスのAutographa Californicaを感染させた。希釈後、細胞を血清補充物、抗生物質、または殺菌剤非存在下のExcell−400内で48〜72時間培養した。培養液を集め、そして10,000×gで30分間遠心分離して浮遊細胞およびその他の細胞破砕物を除いた。次にコンディション培地を、0.8μフィルター(Millipore)で濾過し、そしてこの培地の約5リットルを、3−kDaの分子量カットオフ値を有するfiltron cassette system(Omega membrane)を用いて200mlに濃縮した。
上清をpH7.2に調整した。30mlの試料を、10mM Tris−HCl pH7.3、 150mM NaClで平衡化したヘパリンセファロース樹脂に添加した。樹脂を、平衡化緩衝液で、吸光度がベースラインに戻るまで大量に洗浄し、そして次に0.45Mから1Mおよび2Mの上昇NaCl濃度で段階的に溶出させた。細胞増殖アッセイに用いたフラクションからアリコートを分離し、そして最も高い生物活性を有する1M NaClのフラクションをプールした。プールしたフラクションを10mM Tris pH7.2 で5倍に希釈し(最終塩濃度0.2M NaCl)、そして同試料をSuper loopで、FPLCシステムに連結されたMono Sカラム(Pharmacia,Piscataway,NJ)に供した。直線勾配(10mM Tris pH7.3、0.2M NaCl〜10mM Tris pH7.3、1M NaCl)により溶出を行った。分画後、アリコートを生物活性について試験し、活性フラクションをプールした。
得られたフラクション中のKGF活性の存在を、BALB/C−Mk細胞の成長を促進するフラクションの能力により評価した。この点に関して、任意のフラクションの10μlアリコートを1mlのリン酸緩衝生理食塩液(「PBS」)中0.2%ゼラチンに希釈し、そして10μlの希釈フラクションを、各々22mmウエルを含む12−ウエルクラスタープレートに5×103細胞/ウエルで接種されたBALB/C−Mk細胞の成長刺激活性について試験した。全てのKGF活性がカラム内に保持されることが見出され、そして1M NaClで溶出された。
Laemmliら Nature 227:680−685(1970)に記載の手順に従い、NaDodSO4によりポリアクリルアミドゲルを調製した。10mM DTT存在下で3分間試料を煮沸し、そして12%ポリアクリルアミドゲル中で電気泳動した。ゲルを固定し、そしてBioRadの試薬およびプロトコールを用い、Merrilら Science 211:1437−1438に考察されている通りに銀染色を行った。適切な分子量マーカーは、Biorad製である。
カラムフラクションおよび精製試料のマイトジェン活性を、標的細胞としてBalb/Mk細胞を用いることによって測定した。ストック培養物を生育し、そしてGospodarowiczら J.Cell Physiol.142:325−333に記載の通り、10%FCS、50μg/mlゲンタマイシン、0.25μg/mlファンギゾン(fungizone)、および10ng/ml aFGFを補充した低カルシウム改変イーグル培地中に維持した。マイトジェンアッセイ用の細胞を、Gospodarowiczらに記載の通り、10%FCSを補充した1mlの低カルシウムMEM中に5×103〜1×104細胞/ウエルの密度で12ウエルクラスタープレートに接種した。培養5日後に、 Gospodarowiczらに記載の通り、試料の添加および最終細胞密度の測定を行った。
S1 Y D M5 E G G D I R V R R L F X R T Q
本発明はまた、KGFdcs1−23をコードするDNAセグメント、およびFGFファミリーの他のメンバーに対してKGF163の非保存性NH2末端特性を欠くKGF由来のより短い他の形状を含む。
KGF163およびKGFdcs1−23の2つの名目上100pmolの試料を、エドマン分解、および二フッ化ポリビニリデン(PVDF、Applied Biosystems Biospin)への遠心吸着後のAA分析により分析した。試料をApplied Biosystems 477A 気相タンパク質シークエネーターに添加した。標準的なソフトウエアおよびApplied Biosystems供給の化学試薬を用いて、20回のエドマン分解を行い、そして自動化オンラインHPLCカラム(モデル120A、Applied Biosystems)によりPTHアミノ酸の同定を行った。
Claims (34)
- 単離されたポリペプチドであって、該ポリペプチドは成熟、完全長ヒトKGFのフラグメントのアナログであり、ここで該アナログは、該フラグメントのアミノ酸配列において1つ以上のアミノ酸の保存的置換を有するアミノ酸配列からなり、そしてさらに該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加である、単離されたポリペプチド。
- 単離されたポリペプチドであって、該ポリペプチドは成熟、完全長ヒトKGFのフラグメントのアナログであり、ここで該アナログは、該フラグメントのアミノ酸配列において1つ以上のアミノ酸の挿入、欠失、または置換を有するアミノ酸配列からなり、そして該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加であり、ただし該単離されたポリペプチドは、以下の配列:
単離されたポリペプチド。 - 請求項2または3に記載の単離されたポリペプチドであって、該ポリペプチドはそのN末端にメチオニン残基を含む、単離されたポリペプチド。
- 前記生物活性における増加が、生物活性における約2倍〜約10倍の増加である、請求項1〜4のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における約7倍〜約10倍の増加である、請求項1〜4のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における約10倍の増加である、請求項1〜4のいずれか一項に記載のポリペプチド。
- 単離されたポリペプチドであって、該ポリペプチドは、以下の配列:
単離されたポリペプチド。 - 請求項9または10に記載の単離されたポリペプチドであって、該ポリペプチドはそのN末端にメチオニン残基を含む、単離されたポリペプチド。
- 前記生物活性における増加が、生物活性における少なくとも約2倍〜約10倍の増加である、請求項8〜11のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における少なくとも約7倍〜約10倍の増加である、請求項8〜11のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における約10倍の増加である、請求項8〜11のいずれか一項に記載のポリペプチド。
- 単離されたポリペプチドであって、該ポリペプチドは、成熟、完全長ヒトKGFのフラグメントであって、ここで該フラグメントのアミノ酸配列は、成熟、完全長ヒトKFGのアミノ酸8より下流かつアミノ酸27より上流の位置でN末端を有し、かつアミノ酸163まで伸長し、そして、該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加であり、ただし該単離されたポリペプチドは、以下の配列:
単離されたポリペプチド。 - 単離されたポリペプチドであって、該ポリペプチドは、成熟、完全長ヒトKGFのフラグメントのアナログであって、ここで該フラグメントのアミノ酸配列は、成熟、完全長ヒトKFGのアミノ酸8より下流かつアミノ酸27より上流の位置でN末端を有し、かつアミノ酸163まで伸長し、ここで該アナログは、該フラグメントのアミノ酸配列において1つ以上のアミノ酸の保存的置換を有するアミノ酸配列からなり、そしてさらに、該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加である、単離されたポリペプチド。
- 単離されたポリペプチドであって、該ポリペプチドは、成熟、完全長ヒトKGFのフラグメントのアナログであって、ここで該フラグメントのアミノ酸配列は、成熟、完全長ヒトKFGのアミノ酸8より下流かつアミノ酸27より上流の位置でN末端を有し、かつアミノ酸163まで伸長し、ここで該アナログは、該フラグメントのアミノ酸配列において1つ以上のアミノ酸の挿入、欠失、または置換を有するアミノ酸配列からなり、そしてさらに、該ポリペプチドは、Balb/MK生物活性アッセイにより測定される場合に、成熟、完全長ヒトKGFと比較して生物活性における増加を示し、そして上皮細胞増殖を特異的に刺激し、そして該生物活性における増加は、生物活性における少なくとも約2倍の増加であり、ただし該単離されたポリペプチドは、以下の配列:
単離されたポリペプチド。 - 請求項16または17に記載の単離されたポリペプチドであって、該ポリペプチドはそのN末端にメチオニン残基を含む、単離されたポリペプチド。
- 前記生物活性における増加が、生物活性における約2倍〜約10倍の増加である、請求項15〜18のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における約7倍〜約10倍の増加である、請求項15〜18のいずれか一項に記載のポリペプチド。
- 前記生物活性における増加が、生物活性における約10倍の増加である、請求項15〜18のいずれか一項に記載のポリペプチド。
- KGFdes1−23の単離されたアナログであって、該アナログは、140アミノ酸を有し、かつ以下の配列:
単離されたアナログ。 - 請求項22または23に記載の単離されたアナログであって、該アナログはそのN末端にメチオニン残基を含む、単離されたアナログ。
- 前記生物活性における増加が、生物活性における約2倍〜約10倍の増加である、請求項22〜24のいずれか一項に記載のアナログ。
- 前記生物活性における増加が、生物活性における約7倍〜約10倍の増加である、請求項22〜24のいずれか一項に記載のアナログ。
- 前記生物活性における増加が、生物活性における約10倍の増加である、請求項22〜24のいずれか一項に記載のアナログ。
- 請求項1〜27のいずれかに記載のポリペプチドまたはアナログのコード配列を含む、ポリヌクレオチド。
- 請求項30に記載のポリヌクレオチドおよびそのコード配列の発現のための調節配列を含む、発現ベクター。
- 請求項31に記載の発現ベクターを含む、宿主細胞。
- 前記宿主細胞が、細菌細胞、酵母細胞、哺乳動物細胞および昆虫細胞からなる群から選択される、請求項32に記載の宿主細胞。
- 組換えポリペプチドを産生する方法であって、請求項32または33のいずれかに記載の宿主細胞の集団を提供する工程、および該組換えポリペプチドの発現を提供する条件下で該細胞を培養する工程、を包含する、方法。
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1994
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- 1994-04-28 PL PL94312257A patent/PL312257A1/xx unknown
- 1994-04-28 CA CA002166278A patent/CA2166278A1/en not_active Abandoned
- 1994-04-28 EP EP94916597A patent/EP0706563B1/en not_active Expired - Lifetime
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1995
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1998
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2000
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2004
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2005
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2006
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2007
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JP2011519358A (ja) * | 2008-04-11 | 2011-07-07 | ケアジェン カンパニー,リミテッド | 成長因子−模倣(mimicking)ペプチド及びその用途 |
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