JP2013538056A - インフルエンザh5赤血球凝集素の主要中和エピトープに特異的なモノクローナル抗体 - Google Patents
インフルエンザh5赤血球凝集素の主要中和エピトープに特異的なモノクローナル抗体 Download PDFInfo
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- C07K16/10—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
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Abstract
Description
[0001]本出願は、電子形式の配列表とともに出願されている。配列表は2577_203_Sequence_Listing.txtと題され、2010年8月20日に作成されている。配列表の電子形式の情報は、その全体が本明細書に援用される。
材料および方法
[0061]ウイルス:クレード2.1 A/インドネシア/CDC669/2006、A/インドネシア/TTL012/2006、A/インドネシア/TLL013/2006、A/インドネシア/TLL014/2006およびA/インドネシア/CDC326/2006由来のH5N1ヒト・インフルエンザウイルスを、インドネシア保健省(MOH)から得た。***異なるクレード由来のウイルス(クレード0−A/香港/156/97、クレード1.0−A/香港/213/2004、クレード4.0−A/ガチョウ(goose)/貴陽/337/06およびクレード8.0−A/ニワトリ(chicken)/河南/12/04)は、逆遺伝学(RG)(WHO、2005)によってレスキューされた。簡潔には、合成HAおよびNA遺伝子を、インフルエンザA逆遺伝学用の二重プロモータープラスミド内にクローニングした。二重プロモータープラスミドは、疾病対策予防センター、米国・ジョージア州アトランタより得られた。リポフェクタミン2000(Invitrogen社、米国)を用いて、293TおよびMDCK細胞の共培養内に、HAおよびNAを含有するプラスミドを、A/プエルトリコ/8/34(H1N1)由来の残りの6つの遺伝子のプラスミドとともにトランスフェクションすることによって、リアソータント・ウイルスをレスキューした。ストックウイルスを11日齢の胚発育鶏卵の尿膜腔中、35℃で3691時間増殖させた。高い病原性のウイルスを伴うすべての実験を、CDC/NIHおよびWHO推奨にしたがって、BSL 3+封じ込め施設中で行い、そしてまた、これらは、シンガポールの農畜産物管理庁およびMOHによって認可された。
ネズミmAb 4C2の性質決定およびキメラ化
[0072]インフルエンザ赤血球凝集素(HA)に対する一団のmAbを、異なる株のH5N1ウイルスの効率的な中和に関してスクリーニングした。中和エスケープ突然変異体の選択を用いて、4C2 mAbのエピトープを形成する際に関与するアミノ酸を分析した。シグナルタンパク質を含む、HAタンパク質のアミノ酸配列を配列番号19に示し、そして成熟HAタンパク質のアミノ酸配列を配列番号20に示す。4C2 mAbに対する多数のエスケープ変異体から単離された完全HA遺伝子の配列は、アミノ酸155位(SerからIle)および189位(ArgからLys)で単一点突然変異を所持した(配列番号20に示す成熟HAタンパク質に関して)。H5N1ウイルスとの反応性、ならびに高いHI活性(表1)および中和力価(表2)に基づくマウスモデルにおいて、療法研究のため、mAb 4C2を選択した。
H5N1株の異なるクレードに対する4C2 mAbの赤血球凝集素阻害力価
H5N1株の異なるクレードに対する4C2 mAbのマイクロ中和力価
#マイクロ中和アッセイに用いた各ウイルス株100TCID50
実施例3
4C2 mAbでの予防的治療は、致死性ウイルス曝露からマウスを保護する
[0073]本発明者らは、H5N1ウイルスのクレード1またはクレード2.1株に曝露されたマウスにおける4C2 mAbの保護有効性を調べた。単一用量の5mg/kgまたは10mg/kgの4C2で前治療されたすべてのマウスは、H5N1ウイルスの5MLD50の両クレードでの致死性曝露後、死から保護され(100%保護)(図1A、1B)、一方、すべての未治療対照マウスは、曝露後第6日までに、ウイルス感染によって死亡した。さらに、2.5kg/mgの最低濃度の4C2で前治療されたマウスであっても、クレード1(図1A)およびクレード2.1(図1B)ウイルス曝露に対して、それぞれ70および80%の保護を示した。
4C2での療法的治療は、致死性ウイルス曝露からマウスを保護する
[0074]H5N1致死性曝露に対する4C2 mAbの療法的有効性を決定するため、マウスを5MLD50のクレード1またはクレード2.1ウイルス株に曝露した。ウイルス曝露24時間後、マウスを2.5mg/kg、5mg/kgまたは10mg/kgの4C2で治療した。mAb 4C2は、5mg/kgおよび10mg/kgの濃度で、ウイルスの両クレードからマウスを100%保護可能であった(図2Aおよび2B)。2.5mg/kgであっても、クレード1およびクレード2.1ウイルスでの致死性曝露に対して、マウスの80%を保護可能であった。
ネズミmAb 4C2のキメラ化
[0075]定常領域がヒト起源のもので置き換えられるが、可変領域がネズミ起源のままであるように、mAbに関してキメラ・モノクローナル抗体(ch−mAb)を生成した。この方式で生成されたキメラmAbは、66.6%ヒト化された。キメラ抗体は、ネズミmAbの元来の特性をなお保持した(結果未提示)。この方式で、キメラまたはヒト化mAbを調製した。
ch4C2での予防的治療は、致死性ウイルス曝露からマウスを保護する
[0076]本発明者らは、H5N1ウイルスのクレード1またはクレード2.1株に曝露されたマウスにおけるch4C2の保護有効性を調べた。単一用量の5mg/kgまたは10mg/kgのch4C2で前治療されたすべてのマウスは、H5N1ウイルスの5MLD50の両クレードでの致死性曝露後、死から保護され(100%保護)(図3A、3B)、一方、すべての未治療対照マウスは、曝露後第6日までに、ウイルス感染によって死亡した。さらに、2.5kg/mgの最低濃度のch4C2で前治療されたマウスであっても、クレード1(図3A)およびクレード2.1(図3B)ウイルス曝露に対して、それぞれ80および90%の保護を示した。
ch4C2での療法的治療は、致死性ウイルス曝露からマウスを保護する
[0077]H5N1致死性曝露に対するch4C2の療法的有効性を決定するため、マウスを5MLD50のクレード1またはクレード2.1ウイルス株に曝露した。ウイルス曝露24時間後、マウスを2.5mg/kg、5mg/kgまたは10mg/kgのch4C2で治療した。ch4C2は、5mg/kgおよび10mg/kgの濃度で、ウイルスの両クレードからマウスを100%保護可能であった(図4Aおよび4B)。2.5mg/kgであっても、クレード1およびクレード2.1ウイルスでの致死性曝露から、マウスの70%を保護可能であった。
Claims (23)
- H5赤血球凝集素の三次元エピトープに特異的に結合するモノクローナル抗体または抗体断片であって、三次元エピトープが、アミノ酸155(Ser)およびアミノ酸189(Arg)で構成される、前記モノクローナル抗体または抗体断片。
- H5赤血球凝集素の三次元エピトープが、ネズミ・モノクローナル抗体4C2が特異的に結合するものである、請求項1のモノクローナル抗体または抗体断片。
- モノクローナル抗体が、ネズミ・モノクローナル抗体4C2である、請求項1のモノクローナル抗体または断片。
- モノクローナル抗体またはその断片が、ネズミ・モノクローナル抗体4C2由来のキメラまたはヒト化モノクローナル抗体である、請求項1のモノクローナル抗体または抗体断片。
- H5赤血球凝集素が、配列番号20に示すアミノ酸配列を含む、請求項1のモノクローナル抗体または抗体断片。
- 軽鎖可変領域の相補性決定領域が、配列番号2に示すアミノ酸配列内である、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 相補性決定領域が:
LCDR1: QDISGH(配列番号5);
LCDR2: HGT(配列番号6);および
LCDR3: VQYVQFPWT(配列番号7)
である、請求項6のモノクローナル抗体。 - 重鎖可変領域の相補性決定領域が、配列番号4に示すアミノ酸配列内である、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 相補性決定領域が:
HCDR1: GYTFTTYW(配列番号8);
HCDR2: IDPYDSET(配列番号9);および
HCDR3: VRGGSTVAYFGV(配列番号10)
である、請求項8のモノクローナル抗体。 - 軽鎖可変領域の相補性決定領域が、配列番号2に示すアミノ酸配列内であり、そして重鎖可変領域の相補性決定領域が、配列番号4に示すアミノ酸配列内である、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 相補性決定領域が:
LCDR1: QDISGH(配列番号5);
LCDR2: HGT(配列番号6);
LCDR3: VQYVQFPWT(配列番号7);
HCDR1: GYTFTTYW(配列番号8);
HCDR2: IDPYDSET(配列番号9);および
HCDR3: VRGGSTVAYFGV(配列番号10)
である、請求項10のモノクローナル抗体。 - 軽鎖可変領域が、配列番号2に示すアミノ酸配列を含む、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 重鎖可変領域が、配列番号4に示すアミノ酸配列を含む、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 軽鎖可変領域が、配列番号2に示すアミノ酸配列を含み、そして重鎖可変領域が、配列番号4に示すアミノ酸配列を含む、請求項1〜5のいずれか一項のモノクローナル抗体または抗体断片。
- 請求項1〜14のいずれか一項のモノクローナル抗体または抗体断片をコードする、核酸。
- 請求項16の核酸を含む、ベクター。
- 請求項16のベクターを含み、そして発現している細胞。
- 剤および薬学的に許容されうる希釈剤またはキャリアーを含む、薬学的組成物であって、剤が、(a)請求項1〜14のいずれか一項のモノクローナル抗体または抗体断片、(b)前記モノクローナル抗体または抗体断片をコードする核酸を含む核酸分子、(c)前記核酸を含むベクター、および(d)前記ベクターを発現している細胞からなる群より選択される、前記薬学的組成物。
- 被験体におけるインフルエンザH5N1ウイルス感染を減少させるか、あるいは被験体におけるインフルエンザH5N1ウイルス感染のリスクを低下させるか、あるいは1またはそれより多いインフルエンザH5N1ウイルス株または単離体による被験体の感染を阻害するか、あるいは1またはそれより多いインフルエンザH5N1ウイルス株または単離体によるインフルエンザ感染または疾患を予防する方法であって、その必要がある被験体に、(a)請求項1〜14のいずれか一項のモノクローナル抗体または抗体断片、(b)前記モノクローナル抗体または抗体断片をコードする核酸を含む核酸分子、(c)前記核酸を含むベクター、および(d)前記ベクターを発現している細胞からなる群より選択される剤の療法的有効量を投与する工程を含む、前記方法。
- 被験体が免疫無防備状態であるか、乳児、幼児または高齢者である、請求項19の方法。
- 投与が療法的利益を提供する、請求項19の方法。
- 療法的利益が、(a)インフルエンザウイルス力価の増加を阻害するか、(b)インフルエンザウイルス力価を減少させるか、(c)インフルエンザウイルス複製の増加を阻害するか、(d)インフルエンザウイルス複製を減少させるか、(e)インフルエンザウイルス増殖の増加を阻害するかまたはインフルエンザウイルス増殖を減少させるか、(f)被験体におけるインフルエンザウイルス感染と関連する1またはそれより多い症状または合併症の進行、重症度、頻度、期間または可能性を減少させるか、あるいは(g)インフルエンザウイルス感染からの被験体の回復を加速することを含む、請求項21の方法。
- 症状または合併症が、悪寒、発熱、咳、咽頭炎、鼻閉、副鼻腔鬱血、鼻感染、副鼻腔感染、体の痛み、頭痛、疲労、肺炎、気管支炎、耳感染症、耳の痛みおよび死からなる群より選択される、請求項22の方法。
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US9969794B2 (en) | 2012-05-10 | 2018-05-15 | Visterra, Inc. | HA binding agents |
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AU2010359618A1 (en) | 2013-04-04 |
US8992929B2 (en) | 2015-03-31 |
CN103180341A (zh) | 2013-06-26 |
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EP2609113A4 (en) | 2014-01-22 |
JP6101204B2 (ja) | 2017-03-22 |
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