JP2008195722A - C型肝炎のe1およびe2短縮型ポリペプチドの細胞内生成 - Google Patents
C型肝炎のe1およびe2短縮型ポリペプチドの細胞内生成 Download PDFInfo
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Abstract
【解決手段】以下の工程を包含する、HCV1 E1アミノ酸配列に関する番号付けによる約アミノ酸370から始まるが約アミノ酸300を超えて伸長しないC末端部分を欠く、C型肝炎ウイルス(HCV)E1ポリペプチドを単離するための方法:(a)該HCV E1ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここで、該コード配列は、該コード配列が該宿主細胞において転写および翻訳され得るように、制御エレメントに作動可能に連結されている工程;(b)該HCV E1ポリペプチドが細胞内で発現される条件下で該細胞の集団を培養する工程;(c)該宿主細胞を破壊する工程;および(d)該HCV E1ポリペプチドを該破壊された細胞から単離する工程。
【選択図】なし
Description
技術分野
本発明は、一般的に、ウイルスタンパク質に属する。特に、本発明は、ワクチン組成物における使用および診断試薬としての使用のための、改善された生物学的特性を有するC型肝炎ウイルスE1およびE2タンパク質の短縮型(truncated)形態を単離するための改善された方法に関する。
C型肝炎ウイルス(HCV)は、主として輸血および性交渉により伝播される非経口非A・非B型肝炎の主要な原因である。このウイルスは、血液ドナーの0.4〜2.0%に存在する。慢性肝炎は感染の約50%において発現し、そしてこれらのうち、感染個体の約20%が、時折肝細胞ガンとなる肝硬変を発症する。従って、この疾患の研究および制御は、医学的に重要である。
1.HCV1E1アミノ酸配列に関する番号付けによる約アミノ酸370から始まるが、約アミノ酸300を超えて伸長しないC末端部分を欠く、C型肝炎ウイルス(HCV)E1ポリペプチドを単離するための方法であって:
(a)該HCVE1ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここで、該コード配列は、該コード配列が該宿主細胞において転写および翻訳され得るように、制御エレメントに作動可能に連結されている、工程;
(b)該HCVE1ポリペプチドが細胞内で発現される条件下で、該細胞の集団を培養する工程;
(c)該宿主細胞を破壊する工程;および
(d)該HCVE1ポリペプチドを、該破壊された細胞から単離する工程、
を包含する、方法。
(a)該HCVE2ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここで、該コード配列は、該コード配列が該宿主細胞において転写および翻訳され得るように、制御エレメントに作動可能に連結されている、工程;
(b)該HCVE2ポリペプチドが細胞内で発現される条件下で、該細胞の集団を培養する工程;
(c)該宿主細胞を破壊する工程;および
(d)該HCVE2ポリペプチドを、該破壊された細胞から単離する工程、
を包含する、方法。
本発明は、改善された生物学的特性を示すHCV E1およびE2タンパク質の単離に基づく。このタンパク質は短縮され、そして組換え技術を用いて生成され得る。このような短縮型タンパク質は、普通、培養培地に分泌される。しかし、本明細書中での使用のためのタンパク質は、培養培地よりむしろ細胞から単離される。このように単離された分子は、それらの分泌対照物と比較して、増強したレセプター結合能を示し、タンパク質がHCV中和抗体の生成を誘発する能力を測定するように設計されたアッセイにおいてより良く機能し;そしてより免役反応性であり、従って、改善された診断試薬を提供する。
(a)HCV E1ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここでコード配列は、コード配列が宿主細胞において転写および翻訳され得るように制御エレメントに作動可能に連結されている、工程;
(b)HCV E1ポリペプチドが細胞内で発現される条件下で、細胞の集団を培養する工程;
(c)宿主細胞を破壊する工程;および
(d)HCV E1ポリペプチドを破壊された細胞から単離する工程。
(a)HCV E2ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここでコード配列は、コード配列が宿主細胞において転写および翻訳され得るように制御エレメントに作動可能に連結されている、工程;
(b)HCV E2ポリペプチドが細胞内で発現される条件下で、細胞の集団を培養する工程;
(c)宿主細胞を破壊する工程;および
(d)HCV E2ポリペプチドを破壊された細胞から単離する工程。
(a)被験体から生物学的サンプルを提供する工程;
(b)上記のように、HCV E1ポリペプチドまたはHCV E2ポリペプチドを提供する工程;および
(c)生物学的サンプル中にHCVポリペプチドが存在する場合、HCV抗体がHCVポリペプチドと結合し得る条件下で、生物学的サンプルとHCVポリペプチドとを接触させ、それにより被験体におけるHCV感染の存在または非存在を検出する工程。
本発明の実施は、他に示されない限り、当該技術分野の技術の範囲内にあるウイルス学、微生物学、分子生物学および組換えDNA技術の通常の方法を用いる。このような技術は、文献に十分に説明されている。例えば、Sambrookら、Molecular Cloning: A Laboratory Manual(第2版, 1989);DNA Cloning: A Practical Approach,第IおよびII巻(D.Glover編);Animal Cell Culture(R.Freshney編, 1986);Perbal、A Practical Guide to Molecular Cloning(1984);Fundamental Virology,第2版, 第IおよびII巻(B.N.FieldsおよびD.M.Knipe編);Protein Purification Applications: A Practical Approach,(E.L.V. HarrisおよびS.Angal編、1990);およびT.E.Creighton,Proteins:Structures and Molecular Properties(W.H.FreemanおよびCompany、1993)を参照のこと。
本発明の説明において以下の用語が用いられ、それらは以下に示されるように定義されることを意図されている。
本発明は、組替え的に生成され、C末端が短縮されており、増殖培地から直接的にではなく、細胞培養物由来のE1およびE2ポリペプチドを得る新規の方法の発見に基づく。本明細書中で実証されるように、この様式で精製される分子は、驚くべきことに、これらの分泌対応物よりも良好な生物学的特性を有する。例えば、細胞内で産生される分子は、増強されたレセプター結合能力を提示し、HCV中和抗体の産生を誘発するタンパク質の能力を計測するために設計されたアッセイにおいて、優れた能力(performance)を示し、そしてより免疫応答性であり、従って、それらの分泌対応物と比較して改良された診断剤を提供する。
以下は、本発明を行うための具体的な実施態様の例である。これらの例は例証を目的としてのみ提示されるものであり、そしていかなる意味においても本発明の範囲を限定することを意図しない。
HCV鋳型
図3に示す一連の短縮型E1鋳型および図4に示すE2鋳型を、PCRを用いて作製した。メチオニン残基およびNcoI部位を含む適切な5’プライマーを、示されたエンベロープ終点の後ろに終結コドンおよびE1については最後にBamHI部位を有する3’プライマーと共に使用した。両方のオリゴは、NcoIおよびBamHI酵素によるより効率的な消化を容易にするために、その末端に非特異的配列を有した。消化されたPCRフラグメントを、NcoI/BamHI消化pTM1(Elroy-SteinおよびMoss、Proc.Natl.Acad.Sci.USA(1990)87:6743-6747)に連結した。pTM1ベクターは、T7プロモーターおよび示されたDNAによりコードされる第1のメチオニン残基に相当する、NcoIクローニング部位に隣接したEMCリーダーを含む。E2鋳型をNcoIおよびAscIで消化し、そしてNcoI(部分的)/AscI-pTM1-CE2(Selbyら、J.Gen.Virol.(1993)74:1103-1113)にクローニングして、翻訳がアミノ酸1から始まり、そしてコア、E1、および示されたE2領域をコードする、Hクローンを作製した。
以下のように、アミノ酸715lysにそのC末端を有する短縮型E2分子(「E2715」)を発現した。アミノ酸715で終結するクローンを使用して、Spaeteら、Virol.(1992)188:819-830に記載される技術を用いてDHFR欠損チャイニーズハムスター卵巣(CHO)細胞株をトランスフェクトした。発現後、CHO細胞を溶解し、そして細胞内で生成されたE2715を、以下のように、GNAアガロースクロマトグラフィー、続いて陽イオン交換クロマトグラフィーにより精製した。
アミノ酸715lysでそのC末端を有する、短縮型E2分子(「E2715」)を作った。短縮型E2分子を、Spaeteら、Virol.(1992)188:819-830において記載されたように、チャイニーズハムスター卵巣細胞/ジヒドロ葉酸レダクターゼ(CHO/DHFR)発現系を用いて発現した。発現後、分泌型E2715を、1996年2月15日に公開された国際公開番号WO 96/04301において記載されたようなさらなる実験における使用のために精製した。
HeLa細胞において生成されたE1/E2複合体(複合体化完全長E1およびE2を含む)を、以下のように単離した。HeLa S3細胞に、5pfu/細胞の感染多重度でE1およびE2を発現する精製高力価ワクシニアウイルスを接種し、そして混合物を37℃で30分間攪拌した。次いで、感染細胞を、8リットルのスピナー培地を含むスピナーフラスコに移し、そして37℃で3日間インキュベートした。細胞を遠心分離により再収集し、そして氷上で低張緩衝液(20mM HEPES、10mM NaCl、1mM NaCl、1mM MgCl2、120ml)中に再懸濁した。
分泌型E2および細胞内E2のレセプター結合
GNAアガロース精製細胞内E2および分泌型E2を、Rosaら、Proc.Natl.Acad.Sci.USA(1996)93:1759-1763および1996年2月22日に公開された国際公開番号WO 96/05513において記載されたような結合アッセイにおいて使用した。このアッセイは、E2タンパク質のヒトリンパ腫T細胞(MOLT-4細胞)への特異的結合、および抗原のMOLT-4細胞への結合を中和する血清の細胞蛍光測定評価に基づいて、その中和を評価する。
分泌型E2および細胞内E2の免役反応性
細胞内で生成された短縮型E2タンパク質の免疫反応性もまた、マウスモノクローナル抗体およびヒトポリクローナル血清を用いて、分泌型E2タンパク質の免疫反応性と比較した。
このアッセイにおいて使用されたマウスモノクローナル抗体を以下のように生成した。マウスを、表1に明記された免疫原で免役化した。免役化マウスに由来する脾臓細胞を得、そしてKohlerおよびMilstein,Nature(1975)256:495-497により記載された手順を用いて、50%ポリエチレングリコール4000(Merk)中で2.5×107個NSO/2マウス骨髄腫細胞と融合させた。融合後、細胞を、非必須アミノ酸、10%胎児ウシ血清(FBS)(Hyclone Laboratories,Salt Lake City,UT)、100Ul/mlのペニシリン、100μg/mlストレプトマイシン、2mM L-グルタミン、108Mヒポキサンチン、4×10-3Mチミジン(全試薬はSigmaに由来する)を補充した、ダルベッコ培地を用いて作られたHAT中に再懸濁した。100μlアリコートを、96ウェル組織培養プレート(Nunk,DK 4000 Roskikle,Denmark)上に播種した。プレートを、空気中10%CO2を含む加湿空気内で37℃でインキュベートした。融合の10日後、ハイブリドーマ増殖を示す培養物に由来する上清を、抗B抗体生成についての血球凝集反応によりスクリーニングした。全ての陽性培養物を24ウェルプレートに拡大し、そして細胞を、90%FCSおよび10%ジメチルスルホキシド(Merk)を含む培地中で液体窒素下で凍結した。目的のハイブリドーマを、それらの特異性、アビディティー、および血球凝集反応の強度に基づいて選択し、そして限界希釈技術により2回、再クローニングした。
細胞内で生成された短縮型E2対分泌型E2の免疫反応性をさらに決定するために、セロコンバージョンパネルを、市販の血清供給源を用いて行った。200μlのサンプル希釈剤中に希釈された5μlの各血清サンプルを、表3に同定される抗原を用いて上記のように調製されたプレートに添加した。プレートを37℃で1時間インキュベートし、そして洗浄緩衝液で5回洗浄した。結合希釈剤中に希釈された200μlの結合ヤギ抗ヒトIgG(H+L)Fab’2を添加し、そしてプレートを37℃で1時間インキュベートした。プレートを上記のように洗浄し、そして200μlのOPD基質を用いて発色した。
細胞内で生成された短縮型E2対分泌型E2の免疫反応性をさらに決定するために、さらなる研究を、固定化HCV抗体を用いて行った。これらのアッセイにおいて使用された抗体は、モノクローナル抗体6A21および3E5-1(両方とも上記の表1に記載される)、ならびにHCV感染患者の血清から精製され、そしてE2 N末端の超可変領域に特異的であるIgG抗体調製物であった。
モルモットの分泌型E2および細胞内E2での免役化
分泌型HCV E2715および細胞内で生成されたHCV E2715の免疫原性を、モルモットにおいて決定した。5群の動物を、MF-75およびアジュバントとしてMTP-PEを用いて処方された上記の抗原で免役化した。内部HeLa E1/E2を、コントロールE2調製物として使用した。モルモットを、表6に明記された用量を用いて、0、1、および3ヶ月で筋肉内に免役化し、そして血清をモルモットから収集し、そしてさらなる研究のためにプールした。
Claims (10)
- HCV1 E1アミノ酸配列に関する番号付けによる約アミノ酸370から始まるが、約アミノ酸300を超えて伸長しないC末端部分を欠く、C型肝炎ウイルス(HCV)E1ポリペプチドを単離するための方法であって:
(a)該HCV E1ポリペプチドのコード配列を含むポリヌクレオチドで形質転換された宿主細胞の集団を提供する工程であって、ここで、該コード配列は、該コード配列が該宿主細胞において転写および翻訳され得るように、制御エレメントに作動可能に連結されている、工程;
(b)該HCV E1ポリペプチドが細胞内で発現される条件下で、該細胞の集団を培養する工程;
(c)該宿主細胞を破壊する工程;および
(d)該HCV E1ポリペプチドを、該破壊された細胞から単離する工程、
を包含する、方法。 - 前記HCV E1ポリペプチドが、HCV1 E1アミノ酸配列に関する番号付けによる約アミノ酸360の後で末端を切断される、請求項1に記載の方法。
- 前記単離する工程が、アフィニティクロマトグラフィーを用いて行われる、請求項1または2に記載の方法。
- 前記アフィニティクロマトグラフィーが、GNAアガロースクロマトグラフィーである、請求項3に記載の方法。
- 請求項1から4のいずれかに記載の方法により生成されたHCV E1ポリペプチド。
- 薬学的に受容可能な賦形剤および請求項5に記載のHCV E1ポリペプチドを含む組成物。
- 請求項5に記載のHCV E1ポリペプチドと薬学的に受容可能な賦形剤とを組み合せる工程を包含する、組成物を調製する方法。
- HCV感染を有すると推測される被験体においてHCV感染の存在または非存在を検出するために有用な医薬の製造のための、請求項5に記載のHCV E1ポリペプチドの使用。
- HCV感染を検出するための免疫診断試験キットであって、該試験キットは、請求項5に記載のHCV E1ポリペプチドおよび該免疫診断試験を行うための説明書を含む、キット。
- 明細書中に記載のHCV感染を処置するための方法。
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WO1999066033A1 (en) * | 1998-06-18 | 1999-12-23 | The Government Of The United States Of America, Represented By The Secretary, Department Of Healtha Nd Human Services | Surface targeted expression of a modified hepatitis c virus envelope protein |
US6432411B1 (en) | 1999-07-13 | 2002-08-13 | Hawaii Biotechnology Group | Recombinant envelope vaccine against flavivirus infection |
WO2001030812A2 (en) | 1999-10-27 | 2001-05-03 | Chiron Corporation | Activation of hcv-specific t cells |
EP1233782B1 (en) | 1999-12-01 | 2008-11-05 | Novartis Vaccines and Diagnostics, Inc. | Eliciting hcv-specific antibodies |
US7094882B2 (en) | 2000-04-21 | 2006-08-22 | Yeda Research And Development Co. Ltd. | Growth factor which acts through erb b-4 rtk |
CU23244A1 (es) * | 2001-07-16 | 2007-10-17 | Ct Ingenieria Genetica Biotech | Formulacion vacunal potenciada por la combinacion de un adn con un antigeno |
AR045702A1 (es) | 2001-10-03 | 2005-11-09 | Chiron Corp | Composiciones de adyuvantes. |
US8029803B2 (en) * | 2002-06-20 | 2011-10-04 | Paladin Labs, Inc. | Chimeric antigens for eliciting an immune response |
US8025873B2 (en) | 2002-06-20 | 2011-09-27 | Paladin Labs, Inc. | Chimeric antigens for eliciting an immune response |
US7439042B2 (en) * | 2002-12-16 | 2008-10-21 | Globeimmune, Inc. | Yeast-based therapeutic for chronic hepatitis C infection |
RU2353399C2 (ru) * | 2003-01-17 | 2009-04-27 | Этлон Медикал, Инк. | Способ удаления вирусов из крови посредством лектин-аффинного гемодиализа |
US7731967B2 (en) | 2003-04-30 | 2010-06-08 | Novartis Vaccines And Diagnostics, Inc. | Compositions for inducing immune responses |
US8007805B2 (en) * | 2003-08-08 | 2011-08-30 | Paladin Labs, Inc. | Chimeric antigens for breaking host tolerance to foreign antigens |
EP1602664A1 (en) * | 2004-03-08 | 2005-12-07 | Innogenetics N.V. | HCV E1 comprising specific disulfide bridges |
EP1574517A1 (en) | 2004-03-09 | 2005-09-14 | Innogenetics N.V. | HCV E1 comprising specific disulfide bridges |
US20090170063A1 (en) * | 2004-06-25 | 2009-07-02 | Advanced Life Science Institute, Inc. | Hcv rna having novel sequence |
EP2460533A3 (en) | 2004-10-18 | 2014-01-08 | Globeimmune, Inc. | Yeast-based therapeutic for chronic hepatitis C infection |
KR20080056301A (ko) * | 2005-10-13 | 2008-06-20 | 바이렉스 메디칼 코포레이션 | 면역 반응을 유도시키기 위한, C형 간염 바이러스폴리펩티드 및 Fc 단편을 함유하는 키메라 항원 |
US8815253B2 (en) | 2007-12-07 | 2014-08-26 | Novartis Ag | Compositions for inducing immune responses |
JP2012503011A (ja) | 2008-09-19 | 2012-02-02 | グローブイミューン,インコーポレイテッド | 慢性c型肝炎ウイルス感染の免疫療法 |
CN105263517B (zh) | 2013-05-15 | 2021-03-26 | 阿尔伯达大学董事会 | E1e2hcv疫苗及使用方法 |
CA2986342C (en) | 2015-07-07 | 2024-04-02 | The Governors Of The University Of Alberta | Hepatitis c virus immunogenic compositions and methods of use thereof |
EP3359577A4 (en) | 2015-10-08 | 2019-04-17 | The Governors of the University of Alberta | HEPATITIS C-VIRUS E1 / E2 HETERODIMERS AND METHOD FOR THE PRODUCTION THEREOF |
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HU216017B (hu) | 1987-11-18 | 1999-04-28 | Chiron Corp. | Eljárás HCV-1 polipeptidek, HCV-1 polinukleotidok, rekombináns vektorok és gazdasejtek, valamint immunesszé kit, hepatitis C vírusfertőzés elleni vakcinák, a fertőzés kimutatására szolgáló diagnosztikumok előállítására, és immunvizsgálati és vírustenyészt |
JP2656995B2 (ja) | 1989-03-17 | 1997-09-24 | カイロン コーポレイション | Nanbvの診断用薬 |
DK0398748T3 (da) | 1989-05-18 | 2002-03-18 | Chiron Corp | NANBV-diagnostika: polynukleotider anvendelige til screening for hepatitis C virus |
SK285623B6 (sk) * | 1990-11-08 | 2007-05-03 | Chiron Corporation | Spôsob produkcie asialoglykoproteínu hepatitis C vírusu |
US6274148B1 (en) * | 1990-11-08 | 2001-08-14 | Chiron Corporation | Hepatitis C virus asialoglycoproteins |
PT773957E (pt) * | 1994-07-29 | 2005-11-30 | Chiron Corp | Polipeptidos truncados e1 e e2 de hepatite c inovadores, e metodos de obtencao dos mesmos |
CA2195312A1 (en) * | 1994-07-29 | 1996-02-15 | Mark Selby | Novel hepatitis c e1 and e2 truncated polypeptides and methods of obtaining the same |
EP1845108A3 (en) | 1994-07-29 | 2007-10-24 | Innogenetics N.V. | Monoclonal antibodies to purified hepatitis c virus envelope proteins for diagnostic and therapeutic use |
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ATE437951T1 (de) | 2009-08-15 |
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EP0980434B1 (en) | 2009-07-29 |
US6521423B1 (en) | 2003-02-18 |
AU7471698A (en) | 1998-11-27 |
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DE69841015D1 (de) | 2009-09-10 |
WO1998050556A3 (en) | 1999-02-11 |
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