JP2020506876A - 組換えrsv抗原 - Google Patents
組換えrsv抗原 Download PDFInfo
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- JP2020506876A JP2020506876A JP2019527542A JP2019527542A JP2020506876A JP 2020506876 A JP2020506876 A JP 2020506876A JP 2019527542 A JP2019527542 A JP 2019527542A JP 2019527542 A JP2019527542 A JP 2019527542A JP 2020506876 A JP2020506876 A JP 2020506876A
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Abstract
Description
大腸菌(Escherichia coli(E. coli)))で発現するための最適化されたコドンを有するRSV Fタンパク質の完全長cDNA配列(Genomics BioSci&Tech)を合成した。この配列をPCRテンプレートとして使用し、HRNと部位φを含有するヌクレオチド457〜633(SEQ ID NO:10)、部位IIを含有するヌクレオチド760〜849(SEQ ID NO:11)、部位IVを含有するヌクレオチド1264〜1314(SEQ ID NO:12)、およびそのC末端α−ヘリックス(HRC)を含有するヌクレオチド1426〜1560(SEQ ID NO:13)を含む、RSV Fタンパク質の4種類の遺伝子断片を増幅した。
大腸菌で発現するための最適化されたコドンを有するHBcタンパク質の完全長cDNA配列(Genomics BioSci&Tech)を合成した。この配列をPCRテンプレートとして使用し、HBcのヌクレオチド1〜444(SEQ ID NO:14)を増幅した後、6−HisでC末端にタグを付加したpET28aのNcoI−XhoI制限酵素部位に挿入することによって、組換えHBc VLPプラスミドを得た。得られたプラスミドを大腸菌BL21(DE3)コンピテント細胞内に形質転換して、タンパク質発現に使用した。
実施例1および2で得られた形質転換した大腸菌BL21(DE3)において、組換えRSV Fタンパク質−6HisおよびHBc−6Hisをそれぞれ発現させ、ニッケルアフィニティークロマトグラフィーで精製した。200体積部の溶出緩衝液(350mM、150mMから0mMまでのイミダゾール、1×PBSの中)に対する1体積部のサンプルのグラジエント溶出により、溶出した(500mMイミダゾール、50mM NaH2PO4、300mM NaCl pH8.0を使用)タンパク質に緩衝液交換を行い、工程ごとに12時間行った。遠心濃縮機(10,000MWCO、Sartorius)を使用することにより、溶出したタンパク質−6Hisを約1mg/mLの濃度まで濃縮した。SDS−PAGEで前記タンパク質の分子サイズおよび純度を測定した。
室温で、PBSにおける8μgの精製したHBc VLPを、銅メッシュ(300メッシュ)に3分間吸着させた。その後、ろ紙を用いてメッシュを軽く優しく拭った。1%酢酸ウラニル水溶液で30秒間染色した後、過量の液体を除去した。JEM−1400電子顕微鏡を使用して、80kVでメッシュを検査した。
1.RSV A2株の原液の製作
ATCCからRSV A2株を得た。HEp−2細胞ATCCにおいてウイルスの繁殖を実施した。RSV A2を使用して、0.2のm.o.i(感染多重度)で、100mmのペトリ皿(Thermo Scientific)において成長した融合度が80%と高い細胞を接種した。37℃のCO2インキュベーターにおいて、血清を含まないダルベッコ変法イーグル培地(Dulbecco’s Modified Eagle’s medium(DMEM))でウイルスの吸着を行った。2時間後、培地を、2%ウシ胎児血清を補充したDMEMに交換し、ペトリ皿を再び48〜72時間培養した。3,000rpmで10分間遠心分離し、細胞破片から、前記ウイルスを含有する上清液を分離した。その後、遠心濃縮機(100,000MWCO、Sartorius)でウイルスを濃縮した。
プラーク試験により、RSVウイルス力価(titer)を測定した。1×PBSで12ウェルプレート中のHEp−2細胞融合単層を洗浄した後、複数種類の希釈度(10−3〜10−7)のRSV A2ウイルスで前記細胞を感染させた。2時間のウイルス吸着を行った後、上清液を除去し、1×PBSで細胞の単層を洗浄した後、DMEM+2%ウシ胎児血清+0.3%アガロースで覆った。37℃でCO2インキュベーターにおいて5日間培養した後、細胞を10%ホルマリンで固定し、0.05%クリスタルバイオレットで染色して、プラーク定量を行った。
病原体のないC57BL/6J雌性マウス(6〜8週齢)を、ランダムで複数群に分け、鼻内(i.n)経路で候補ワクチンを使用して0、21および42日目で免疫接種を行い、63日目で(図4)マウスに1×106p.f.u RSVチャレンジさせた。候補ワクチンは、50μg HRφ24、25μg HBc VLP+25μg HRφ24、25μg HBc VLP+25μg HRφ24+20μg CpG(TCGTCGTTTTCGGCGCGCGCCG,SEQ ID NO.37)(台湾のGenomics社)、25μg HBc VLP+50μg HRφ24、25μg HBc VLP+50μg HRφ24+20μg CpG、50μg HRφ、25μg HBc VLP+50μg HRφ、25μg HBc VLP+50μg HRφ+20μg CpG、50μg HRφ−3φ、25μg HBc VLP+50μg HRφ−3φ、および25μg HBc VLP+50μg HRφ−3φ+20μg CpGを含む。さらに、対照群、25μg HBc VLPのみを使用して0、21、および42日目で鼻内経路で免疫接種を行った群を含む。さらに、1×105p.f.uホルマリンで固定したRSV(FIRSV)を使用して筋肉内(i.m)免疫接種を行った群を含む。
酵素結合免疫吸着試験(ELISA)により、実施例5に記載されている免疫接種したマウスから採集した血清およびBALFの抗体応答を検査した。簡単に説明すれば、4℃で、50μLの精製HRφ24(10μg/ml)を96ウェルプレートに塗布して、一晩放置した。2%BSAで前記プレートを37℃で1時間ブロッキングし、血清サンプルの試験希釈剤(1%BSA、0.05%Tween 20、1×PBSの中)における段階希釈液(10−2〜5.12×10−4)またはBALFの段階希釈液(10−1〜1.28×10−3)を使用して室温で2時間培養した。サンプルごとに希釈曲線を作成し、最も優れた濃度となる希釈物の逆数を終点力価として算出し、前記の最も優れた濃度は、バックグラウンド値(集めた元免疫血清に1/50の希釈を行ったもの、または集めた対照BALFに1/5の希釈を行ったもの)より、0.1U高い。50より低い(陰性サンプル)IgG力価、または5より低い分泌型IgA(sIgA)力価を、任意に50または5とした。
前記候補ワクチンを3回投与する際の効果を評価するために、実施例5に記載されている生RSV A2株チャレンジの免疫接種したマウスを使用した。
マウスがチャレンジ感染された後の体重変化は、ワクチンの防御効果の評価における最も重要な指標である。図6Aおよび6Bを参照して、チャレンジの2日後、対照群と比べて、HRφ24/HBc、HRφ24/HBc/CpG、HRφ−3φ、HRφ−3φ/HBc、HRφ−3φ/HBc/CpG、HRφ/HBcまたはHRφ/HBc/CpGを使用して免疫接種を行ったマウスの体重減少は少なかった。より具体的には、図6Aは、HBcと混合したHRφ24を受けた群のマウスの体重減少が約8〜11%であることを示す。また、チャレンジの3日後、HBc/CpGと混合した25μgおよび50μg HRφ24を使用して免疫接種を行ったマウスは、それぞれ、約16%および12%の体重減少を示す。さらに、図6Bでは、HRφ/HBcまたはHRφ−3φ/HBc混合物を使用して免疫接種を行ったマウスは約12%または10%の体重減少を示すことが明らかになった。逆に、筋肉注射でFIRSVを受けたマウスは、いずれも最も高い毎日の体重減少を示し、また、チャレンジの3日後では約25%の体重減少を示す。
組織学的分析について、肺部サンプルを10%中性緩衝ホルマリンで24時間固定し、パラフィンに包埋され、厚さ5μmの切片を切り出し、ヘマトキシリン−エオジン(H&E)で染色した。
自然的または実験的な感染過程において、ウイルス複製と臨床疾患とは正の相関があるため、肺ウイルス負荷に対する制御は、ワクチン効果の評価における重要なパラメータである(DeVincenzo,J.P.,et al.,2005;Karron,R.A.,et al.,1997)。よって、RSV N遺伝子をターゲットとするqRT−PCRを実施し、肺組織におけるmRNAレベルを定量した。
Claims (20)
- 組換え呼吸器合胞体ウイルス(RSV)Fタンパク質を含む抗原であって、
前記組換えRSV Fタンパク質は、両末端がHRN領域およびHRC領域と接する抗原性領域を含有し、
前記HRN領域およびHRC領域は、それぞれ、SEQ ID NO:1およびSEQ ID NO:2のアミノ酸配列との一致度が少なくとも80%であり、かつSEQ ID NO:1およびSEQ ID NO:2と同じ機能を有するアミノ酸配列を含有し、
前記抗原性領域は、部位φ、部位II、および部位IVからなる群から選ばれる一つまたは複数抗原性部位を含有し、
前記部位φ、部位II、および部位IVは、それぞれ、SEQ ID NO:3、SEQ ID NO:4、およびSEQ ID NO:5のアミノ酸配列との一致度が少なくとも80%であり、かつSEQ ID NO:3、SEQ ID NO:4、およびSEQ ID NO:5と同じ機能を有するアミノ酸配列を含有し、
前記抗原性領域が一つを超える抗原性部位を含有すると、前記抗原性部位はリンカーにより互いに連結し、
前記リンカーは、出現ごとに独立に2〜20個のアミノ酸からなる、
抗原。 - 前記抗原性領域は、前記HRN領域に直接に連結する少なくとも一つの部位φを含む、請求項1に記載の抗原。
- 前記抗原性領域は、部位φ、部位II、および部位IVを含む、請求項2に記載の抗原。
- 前記HRN領域は部位φに直接に連結し、部位IVは前記リンカーにより前記HRC領域に連結する、請求項3に記載の抗原。
- 前記組換えRSV Fタンパク質は、SEQ ID NO:8のアミノ酸配列との一致度が少なくとも80%であり、かつSEQ ID NO:8と同じ機能を有するアミノ酸配列を含む、請求項4に記載の抗原。
- 前記抗原性領域は、四つの部位φを含む、請求項2に記載の抗原。
- 前記組換えRSV Fタンパク質は、SEQ ID NO:7のアミノ酸配列との一致度が少なくとも80%であり、かつSEQ ID NO:7と同じ機能を有するアミノ酸配列を含む、請求項6に記載の抗原。
- 前記リンカーは、GSGS、GGGS、GGSG、SGSGおよびGGのうちのいずれ一つのアミノ酸配列を含む、請求項1に記載の抗原。
- 前記抗原は、5C4、D25、またはAM22融合前特異的な抗体に特異的に結合する、請求項2に記載の抗原。
- 請求項1に記載の抗原をコードするものである、核酸分子。
- コドンが最適化されて原核細胞内で発現するためのものである、請求項10に記載の核酸分子。
- 前記原核細胞は、大腸菌細胞である、請求項11に記載の核酸分子。
- 前記核酸分子は、SEQ ID NO:9の核酸配列との一致度が少なくとも80%である核酸配列を含む、請求項12に記載の核酸分子。
- コドンが最適化されて真核細胞内で発現するためのものである、請求項10に記載の核酸分子。
- 前記真核細胞は、酵母細胞または哺乳動物細胞である、請求項14に記載の核酸分子。
- 前記哺乳動物細胞は、ヒト細胞である、請求項15に記載の核酸分子。
- 有効量の請求項1に記載の抗原を含む、ワクチン組成物。
- さらに、医薬上許容できるキャリアおよび/またはアジュバントを含む、請求項17に記載のワクチン組成物。
- 前記アジュバントは、CpGオリゴヌクレオチドまたはB型肝炎コアウイルス様粒子である、請求項18に記載のワクチン組成物。
- Thl免疫応答を促進する、請求項19に記載のワクチン組成物。
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TW201819404A (zh) | 2018-06-01 |
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AU2017366410B2 (en) | 2021-02-25 |
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JP6903351B2 (ja) | 2021-07-14 |
EP3545971A9 (en) | 2020-03-25 |
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