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不死化ヒト肝細胞を用いたB型肝炎ウイルス(HBV)感染培養系の開発と、これを用いたHBV生活環の解析

赤堀, 祐一 京都大学 DOI:10.14989/doctor.k23341

2021.03.23

概要

B 型肝炎ウイルス(Hepatitis B virus; HBV)は、ヘパドナウイルス科に属する DNAウイルスである。B 型肝炎の原因ウイルスであり、世界中で年間約 90 万人が肝硬変、肝がんなどのHBV 関連疾患で死亡していると推定されている。

近年、HBV 感染受容体として同定されたヒトナトリウム-タウロコール酸共役輸送体(Na+-taurocholate co-transporting polypeptide; NTCP)を用いた HBV 感染培養系の確立により、HBV 生活環のほぼ全ての過程を解析することが可能となった。しかしながら、これまでに確立された HBV 培養系の多くが、正常な肝細胞とは異なる遺伝子発現プロフィールを持つ肝がん由来細胞株を利用していることから、生体内における HBV と宿主細胞間の相互作用の研究には一定の限界があると考えられた。また、生体内の生理的状態の大部分を再現するヒト初代培養肝細胞も、高価であることや分子生物学的手法の導入が困難であること、長期に培養できないといった問題を抱えている。

本研究は、これらの問題を解決するために、不死化ヒト肝細胞である HuS-E/2 細胞に NTCP 発現プラスミドを恒常的に導入した細胞を樹立し、これを用いて新たな HBV感染培養系を確立することを目的として行った。

最終的に、外来性 NTCP の高い発現を示した細胞クローンから E/NtG8 細胞を選択し、Cellbed 担体を用いて立体培養した実験系を構築した。これまでの肝がん由来細胞を用いた HBV 感染培養系は肝がん由来培養細胞に産生させた組換え体 HBV(Cell culture HBV; HBVcc)に高い感染感受性を示すが、血清由来の HBV(Blood-borne HBV; HBVbb)に対する感染感受性は認められなかった。しかしながら、立体培養 E/NtG8 細胞は HBVbb と HBVcc の両方の感染を許容し、特に、HBVbb に対して初代培養ヒト肝細胞と同等の高い感染感受性を持つことがわかった。また、肝がん由来細胞を用いた HBV 感染培養系では HBVcc 感染後に効率の良い HBV 粒子の産生は認められていないが、この立体培養 E/NtG8 細胞からは、HBVbb と同様の高い感染性を持つ HBV 粒子の産生が、HBVbb 感染後から約 1 ヶ月間観察された。これらの結果は、立体培養 E/NtG8 細胞が正常ヒト肝細胞に類似した条件で、HBV 生活環の全てのステップを再現することが可能であることを示唆している。遺伝子発現解析から、この立体培養 E/NtG8 細胞では、平面培養に比較して、肝細胞の成熟化に関連し、HBV 複製を促進することが知られる、肝細胞特異的転写因子 Hepatocyte nuclear factor(HNF)1 αや HNF4αの発現や、HBV 粒子産生に関与することが報告されている脂肪酸合成系酵素の遺伝子発現の亢進が認められ、HBV の効率的な増殖に寄与していることが推定された。一方、HBV に対する宿主制限因子として報告された Structural maintenance of chromosomes 6 (SMC6)の発現は平面培養に比較して減少していた。この結果を元に肝組織内のヒト肝細胞などにおける SMC6 遺伝子発現を検討したところ、同様にその発現は低レベルであり、生体内における制限因子としての機能については再検討する必要があることを見出した。

今後、本研究で確立された HBV 感染培養系は、生理的条件に類似した条件下における HBV と宿主細胞因子間の相互作用に関する新たな発見や、がん化などの HBV 感染による病原性発現メカニズムの解明に貢献することが期待された。

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参考文献

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