JP2009500037A - Haemophilusinfluenzae誘発性疾患のためのキメラワクチン - Google Patents
Haemophilusinfluenzae誘発性疾患のためのキメラワクチン Download PDFInfo
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Abstract
Description
本明細書中に記載される発明は、NTHi OMP P5タンパク質の一部分を提示するNTHi単収縮ピリ線毛(twitching pilus)サブユニットタンパク質(PilA)を含むキメラタンパク質に関する。本発明は、このキメラタンパク質を含むワクチン組成物、および本発明のキメラタンパク質を用いて免疫応答を惹起する方法を提供する。
中耳感染についての臨床用語は中耳炎(OM)である。非特許文献1によれば、OMは、健康管理を受ける病気の小児、および抗生物質を受けるかまたは全身麻酔を受ける米国の小児についての最も一般的な理由である。統計は、1990年にはOMについて2450万人の内科医院の訪問者があったことを示す。これは、1980年代に報告されたのよりも200%より高く増加していることを示す。死亡と関連することは稀であるとはいえ、OMに関連した死亡は重大である。難聴は、この疾患と関連した一般的な問題であり、しばしば、小児の行動、教育および言語習熟の発達に影響を与える(非特許文献2;非特許文献3;非特許文献4)。OMの社会経済的な影響もまた大きく、OMの診断および管理の直接的費用および間接的費用は、米国だけでも毎年50億ドルを超える(非特許文献5)。
本発明は、分類不能型H.influenzae(NTHi)のIV型ピリ線毛主要サブユニットタンパク質(PilA)の一部およびNTHi OMP P5タンパク質(P5−フィンブリン、フィンブリンまたはOMP P5−相同付着因子ともいう)の一部を含むキメラタンパク質に関する。特に、本発明は、LB1ペプチドのB細胞エピトープを提示するように改変されたPilAを含むキメラタンパク質を提供する。本発明はまた、本発明の1またはそれより多くのキメラタンパク質を含むワクチン組成物、および本発明のキメラタンパク質を用いて免疫応答を惹起する方法を提供する。
本発明のキメラタンパク質は、pilA遺伝子によってコードされる、NTHiのIV型ピリ線毛の主要サブユニットの全長または一部分を含み得る。NTHi単離株86−028NPのPilAタンパク質は、配列番号2として示される核酸配列によってコードされる。配列番号2は、米国特許出願第11/019,005号中に記載される。米国特許出願第11/019,005号は、本明細書中にその全体が参考として援用される。また提供されるのは、NTHiの臨床単離株1728MEE、1729MEE、3224A、10548MEE、1060MEE、1885MEE、1714MEE、1236MEE、1128MEEおよび214NP由来のPilAポリペプチドをコードするポリヌクレオチドである。これらのPilAポリペプチドのアミノ酸配列は、それぞれ、配列番号34、配列番号36、配列番号38、配列番号40、配列番号42、配列番号44、配列番号46、配列番号48、配列番号50および配列番号52に示される。代替的なコドン使用法の可能性が、これらのポリペプチドをコードするポリヌクレオチドにおいて特に意図される。1つの実施形態では、これらのポリペプチドは、配列番号33、配列番号35、配列番号37、配列番号39、配列番号41、配列番号43、配列番号45、配列番号47、配列番号49および配列番号51に示されるヌクレオチド配列によってそれぞれコードされる。
本発明は、本発明のキメラタンパク質の抗原性エピトープに結合する抗体を提供する。これらの抗体は、ポリクローナル抗体、モノクローナル抗体、それらの独特のエピトープに対するそれらの結合能力を保持した抗体フラグメント(例えば、Fvフラグメント、FabフラグメントおよびF(ab)2フラグメント)、単鎖抗体およびヒト抗体またはヒト化抗体であり得る。抗体は、本発明のキメラタンパク質または本発明のキメラタンパク質を発現する宿主細胞を抗原として用いて、当該分野で標準的な技術によって作製され得る。
本発明は、個体におけるH.influenzaeに対する免疫応答を個体において惹起する方法を意図する。特定の実施形態では、これらの方法は、本発明のキメラタンパク質に対する免疫応答を惹起する。これらの方法は、1つまたはそれより多くの免疫応答を惹起し、これらの応答としては、細菌複製を阻害する免疫応答、細胞へのH.influenzaeの付着をブロックする免疫応答、H.influenzaeの単収縮を予防する免疫応答、H.influenzae細菌を殺傷する免疫応答およびバイオフィルム形成を防御する免疫応答が挙げられるがこれらに限定されない。1つの実施形態では、これらの方法は、本発明の1つまたはそれより多くのキメラタンパク質を含む組成物の免疫原性用量を投与する工程を包含する。別の実施形態では、これらの方法は、本発明の1つまたはそれより多くのキメラタンパク質を発現する細胞を含む組成物の免疫原性用量を投与する工程を包含する。なお別の実施形態では、これらの方法は、本発明の1つまたはそれより多くのキメラタンパク質をコードする1つまたはそれより多くのポリヌクレオチドを含む組成物の免疫原性用量を投与する工程を包含する。これらのポリヌクレオチドは、他のあらゆる核酸と会合していない裸のポリヌクレオチドであってもよく、またはプラスミドもしくはウイルスベクター(例えば、アデノ随伴ウイルスベクターまたはアデノウイルスベクター)のようなベクター中に存在してもよい。これらの方法は、1個体において組み合わせて用いられ得る。これらの方法は、個体のH.influenzae感染の前または感染後に用いられ得る。本発明の方法および組成物は、H.influenzae(分類可能型(typeable)株および分類不能型株)に関連する任意の病理学的状態(例えば、OM、肺炎、副鼻腔炎、敗血症、心内膜炎、喉頭蓋炎、化膿性関節炎、髄膜炎、分娩後感染および新生児感染、分娩後敗血症および新生児敗血症、急性卵管炎および慢性卵管炎、喉頭蓋(epiglottis)、心膜、蜂巣炎、骨髄炎、心内膜炎、胆嚢炎、腹腔内感染、尿路感染、乳様突起炎、大動脈移植片感染、結膜炎、ブラジル紫斑熱、潜在性菌血症および慢性閉塞性肺疾患および基礎をなす肺疾患(例えば、慢性気管支炎、細気管支炎および嚢胞性線維症)の悪化を処置または予防するために用いられ得る。
あるいは、本発明は、H.influenzae IV型ピリ線毛機能を個体において阻害する方法を包含する。この方法は、この個体に、例えば、1もしくはそれより多くの本発明の抗体および/または1もしくはそれより多くの本発明のキメラタンパク質を、ピリ線毛の機能を阻害する量で投与する工程を包含する。インビトロアッセイを用いて、ピリ線毛機能を阻害する能力を実証し得る。これらの方法の実施形態としては、例えば、IV型ポリ線毛によって媒介される付着のインヒビターを用いる方法、IV型ピリ線毛によって媒介される既存のバイオフィルムを破壊するインヒビターを用いる方法、および単収縮のインヒビターを用いる方法が挙げられる。
本発明の方法は、OMについての実験モデルとして広く受け入れられているチンチラモデルにおいて実証され得る。特に、NTHi誘発性OMのチンチラモデルはよく特徴付けられており(Bakaletz et al,J.Infect.Dis.,168:865−872,1993;BakaletzおよびHolmes,Clin.Diagn.Lab.Immunol.,4:223−225,1997;SuzukiおよびBakaletz,Infect.Immun.,62:1710−1718,1994;Mason et al,Infect.Immun.,71:3454−3462,2003)、そしてOMに対するいくつかのNTHi外膜タンパク質、外膜タンパク質の組み合わせ、キメラ合成ペプチドワクチン成分、およびアジュバント処方物の防御効力を決定するために用いられている(Bakaletz et al,Vaccine,15:955−961,1997;Bakaletz et al,Infect.Immun.,61:2746−2762,1999;Kennedy et al,Infect.Immun.,68:2756−2765,2000;Kyd et al,Infect.Immun.,66:2272−2278,2003;NovotnyおよびBakaletz,J.Immunol,111,1978−1983,2003)。
以下の実施例は、本発明を例示し、ここで、実施例1は、本発明のキメラタンパク質の組換え産生を記載し、実施例2は、本発明のキメラタンパク質の免疫原性を試験するアッセイを記載し、実施例3は、受動免疫を評価するためのアッセイを記載し、実施例4は、能動免疫を評価するためのアッセイを記載し、そして実施例5は、本発明のキメラタンパク質の評価を記載する。
本発明のキメラタンパク質を、標準的な組換え法を用いて産生した。最初に、遺伝子合成会社(Blue Heron Biotechnology Inc.)が、E.coliの好ましいコドン使用法に最適化した、本明細書中に記載のキメラタンパク質のアミノ酸配列に基づいて最初のプラスミドを作製するという契約を結んだ。手短に述べると、N末端(配列番号2の残基1〜39)を切り落とし、そして配列番号3に示すHISタグ配列およびトロンビン切断部位を付加することにより、ネイティブなNTHiピリンタンパク質配列を改変した。このHISタグの前には、発現を補助するための配列(MGSS)があった。トロンビン切断部位は、HISタグの放出を可能にした。次いで、これらのプラスミドをE.coli発現ベクターpET−15bベクター(Novagen)中にクローニングした。次いでこのプラスミドを、可溶性Hisタグ化キメラタンパク質の発現のための宿主としてE.coli株「Origami(DE3)」(Novagenから入手可能)中に形質転換した。使用され得る別のE.coli宿主細胞発現株は、Origami B(DE3)(Novagen)である。
ウサギまたはチンチラを、これらのキメラタンパク質で免疫する。ウサギは、完全フロイントアジュバント中の500μgの第1免疫用量のキメラタンパク質を受ける。これらのウサギは、400μgの第2用量のキメラタンパク質を21日後に受ける。これらのウサギは、完全フロイントアジュバント中の第3用量のキメラタンパク質を、IFAまたはPBSのいずれか中での400μgの同じペプチド(1つの希釈剤あたり1羽のウサギ)とともに、第1免疫用量の42日後に受ける。各投与の3週間後に血清を得る。チンチラは、アジュバントであるモノホスホリルリピドA(MPL)中の10μgの第1免疫用量のキメラタンパク質を受ける。1ヵ月(約30日)後、チンチラは、第2の同一の用量を受ける。第3用量でかつ最終用量を第2用量の約30日後に送達する。各用量の約10〜14日後に血清を得る。全ての動物からの血清を、ELISA、ウェスタンブロットおよびバイオセンサーによって、LB1ペプチド(40マー)、LB1(1)、PilAタンパク質およびキメラタンパク質に対する力価および特異性について評価する。抗血清をまた、フローサイトメトリー(FACS)分析により、細菌全体に対して試験する。
本発明のキメラタンパク質に対する動物の免疫応答によって付与される防御を、実験的中耳炎のチンチラモデルにおいて決定する。チンチラを、本発明のキメラタンパク質に対する超免疫チンチラ血清または超免疫ヒト血清5ml/kgで受動免疫する。コントロールのチンチラは、正常なチンチラ血清または正常なヒト血清を受ける。次に、これらのチンチラは、まず、ウイルス共病原体を鼻腔内に受け、次いで1週間後に、NTHi細菌による鼻腔内チャレンジを受ける。これらのチンチラを検査し、そして細菌チャレンジ後35日目まで毎日または2日毎に評価した。免疫チンチラ血清またはヒト血清を受ける免疫したチンチラは、ビデオ耳鏡検査法およびティンパノメトリの両方によって決定したところ、減少した鼓膜病状を表し、そして中耳空間の感染の徴候は減少していたかまたは徴候はなかった。このアッセイでは、コントロールと比較したとき、チンチラまたはヒトの抗キメラタンパク質血清を受けるチンチラ中の中耳液の存在は減少している。
各々5〜10匹のチンチラのコホートに、食塩水コントロール調製物、アジュバントのみの調製物または適切なアジュバントと混合した本発明のキメラタンパク質のうちの1つのいずれかを能動免疫する。これらの免疫原を、Whittaker Bioproductsから名称QCL−1000の下で市販される色素形成性変形溶解産物アッセイによって、免疫源としてのそれらの使用の前に、内毒素含有量について評価する。次いで、これらのチンチラに、アジュバントMPL(または別の適切なアジュバント)中の10μgの免疫原を皮下注射する。次いで30日後に、これらは、MPL中の10μgの同じ免疫原を受ける。2回目の免疫の30日後、これらの動物は最終免疫用量を受ける。最後の免疫用量を送達してから約10〜14日後、チンチラにNTHiの1株を経水疱(transbullarly)および鼻腔内の両方でチャレンジする。これらのチンチラを、35日間の期間にわたって、以下について評価する:ビデオ耳鏡検査法およびティンパノメトリにより、鼓膜の病状;下水疱(inferior bulla)の鼓室上部穿刺および鼻咽頭の受動洗浄によって回収されたNTHiの半定量;ならびに組織病理学についての固定された中耳粘膜上皮および鼓膜の光学顕微鏡検査。例えば、本発明のキメラタンパク質で免疫されたチンチラは、減少した鼓膜病状を有し、中耳滲出液がないかもしくは培養陰性である滲出液を含み、鼓室に存在するバイオフィルムは減少しているかもしくは存在せず、中耳粘膜の最小の厚みがあり、最小の骨新生(osteoneogensis)があり、そして上皮下空間における赤血球および炎症細胞の両方の存在が減少している。
配列番号56のアミノ酸配列を有するキメラタンパク質(本明細書中では「chim−V3」という)の防御効力を、OMのチンチラ受動転移超感染モデルを用いて評価した。このキメラペプチドは、組換えPilA(配列番号2の残基40〜149)のC末端グルタミン残基の後に発現されたLB1ペプチドのB細胞エピトープ(配列番号5)からなっていた。受動転移効力研究において使用するためのポリクローナル抗血清を作製するために、chim−V3タンパク質を、アジュバントであるモノホスホリルリピドA(MPL)+トレハロースジミコレート(Corixa)とともに成体チンチラのコホートに送達した。免疫レジメンを示すタイムラインを図1に示す。免疫血清プールを作製するために、警戒しやすい(alert prone)チンチラに30μgのchim−V3+10μgのMPLまたは10μg MPL単独を21日間毎に3回皮下免疫した。56日目に、接種した動物の最後の採血を収集し、そして未刺激の若齢動物への転移のために血清をプールした。効力を研究するために、別々のコホートの若齢チンチラを、−7日目に最初にアデノウイルスでチャレンジした。7日後(−1日目)、プールした抗chim−V3免疫血清を、アデノウイルスに曝したこれらの動物へと受動転移した。翌日(0日目)、受動転移による抗chim−V3血清を受けた動物に、分類不能型Haemmophilus influenzae細菌をチャレンジした。次いで、これらの動物を、ビデオ耳鏡検査およびティンパノメトリによって毎日、ならびにXenogenインビボ画像化によって1日おきに、(細菌チャレンジに対して)26日間の時間経過にわたって、疾患の発生率および重篤度についてモニタリングした。
Claims (13)
- キメラタンパク質であって、PilAの一部分およびLB1ペプチドの一部分を含む、キメラタンパク質。
- 前記LB1ペプチドの一部分が、LB1ペプチドのB細胞エピトープを含む、請求項1に記載のキメラタンパク質。
- 前記LB1ペプチドの一部分が、配列番号4、配列番号5、配列番号6、配列番号7または配列番号8のアミノ酸配列を含む、請求項2に記載のキメラタンパク質。
- 配列番号9、配列番号10、配列番号11、配列番号12、配列番号13、配列番号14、配列番号15、配列番号16、配列番号17、配列番号18、配列番号19、配列番号20、配列番号21、配列番号22、配列番号23、配列番号24、配列番号25、配列番号26、配列番号27、配列番号28、配列番号29、配列番号30、配列番号31、配列番号32、配列番号54、配列番号55、配列番号56または配列番号57のアミノ酸配列を含む、請求項1に記載のキメラタンパク質。
- 請求項1〜4のいずれか1項に記載のキメラタンパク質をコードする、ポリヌクレオチド。
- 請求項5に記載のポリヌクレオチドを含む、ベクター。
- 請求項1〜4のいずれか1項に記載のキメラタンパク質および薬学的に受容可能なキャリアを含む、組成物。
- 請求項1〜4のいずれか1項に記載のキメラタンパク質に特異的に結合する、抗体。
- 請求項8に記載の抗体および薬学的に受容可能なキャリアを含む、組成物。
- NTHi細菌に対する免疫応答を惹起するための方法であって、免疫原性用量の請求項1〜4のいずれか1項に記載の1以上のキメラタンパク質を、NTHi細菌感染の危険性がある患者に投与する工程を包含する、方法。
- 前記NTHi感染が、中耳においてである、請求項10に記載の方法。
- NTHi細菌感染を処置または予防する方法であって、請求項8に記載の抗体を、その必要がある患者に投与する工程を包含する、方法。
- 前記NTHi感染が、中耳においてである、請求項12に記載の方法。
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- 2006-07-05 AT AT06800001T patent/ATE488526T1/de not_active IP Right Cessation
- 2006-07-05 EP EP10174620A patent/EP2298794A3/en not_active Withdrawn
- 2006-07-05 JP JP2008520357A patent/JP2009500037A/ja active Pending
- 2006-07-05 EP EP06800001A patent/EP1904519B1/en not_active Not-in-force
- 2006-07-05 US US11/994,830 patent/US7811591B2/en active Active
- 2006-07-05 CA CA2613970A patent/CA2613970C/en not_active Expired - Fee Related
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2009
- 2009-10-14 JP JP2009237768A patent/JP2010172332A/ja active Pending
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2010
- 2010-10-05 US US12/898,287 patent/US8263363B2/en active Active
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2012
- 2012-09-10 US US13/608,500 patent/US8741304B2/en active Active
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014512365A (ja) * | 2011-04-13 | 2014-05-22 | グラクソスミスクライン バイオロジカルズ ソシエテ アノニム | インフルエンザ菌タンパク質eおよびピリンaを含む融合タンパク質および組合せワクチン |
US11198707B2 (en) | 2011-04-13 | 2021-12-14 | Glaxosmithkline Biologicals Sa | Fusion proteins and combination vaccines comprising Haemophilus influenzae Protein E and Pilin A |
JP2015536312A (ja) * | 2012-10-17 | 2015-12-21 | グラクソスミスクライン バイオロジカルズ ソシエテ アノニム | 1種以上の肺炎球菌莢膜糖類コンジュゲートとインフルエンザ菌由来のタンパク質Eおよび/またはPilAを含むタンパク質成分とを含む免疫原性組成物 |
Also Published As
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WO2007008527A3 (en) | 2007-03-15 |
WO2007008527A2 (en) | 2007-01-18 |
US20110081357A1 (en) | 2011-04-07 |
DE602006018308D1 (de) | 2010-12-30 |
US8741304B2 (en) | 2014-06-03 |
EP2298794A2 (en) | 2011-03-23 |
EP2298794A3 (en) | 2011-04-06 |
ATE488526T1 (de) | 2010-12-15 |
CA2613970C (en) | 2015-12-08 |
JP2010172332A (ja) | 2010-08-12 |
US7811591B2 (en) | 2010-10-12 |
EP1904519A2 (en) | 2008-04-02 |
EP1904519B1 (en) | 2010-11-17 |
US8263363B2 (en) | 2012-09-11 |
US20080311110A1 (en) | 2008-12-18 |
US20130064828A1 (en) | 2013-03-14 |
CA2613970A1 (en) | 2007-01-18 |
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