臨牀消化器内科 Vol.26 No.11(4-1)


特集名 肝と免疫
題名 ウイルス肝炎と免疫 (1) B型肝炎と免疫 b.de novo B型肝炎
発刊年月 2011年 10月
著者 桶谷 眞 鹿児島大学大学院消化器疾患・生活習慣病学
著者 宇都 浩文 鹿児島大学大学院消化器疾患・生活習慣病学
著者 井戸 章雄 鹿児島大学大学院消化器疾患・生活習慣病学
著者 坪内 博仁 鹿児島大学大学院消化器疾患・生活習慣病学
【 要旨 】 de novo B型肝炎は,HBs抗原陰性,HBc抗体ないしHBs抗体陽性の既往感染者からのHBV再活性化である.de novo B型肝炎の原因は多様であり,発症のリスクや肝炎発症後の経過は原疾患や免疫抑制療法の内容により異なる.リツキシマブとステロイド併用化学療法はde novo B型肝炎の発症および劇症化の高リスク因子である.de novo B型肝炎は免疫抑制療法からHBVの増殖,またHBVの増殖から肝炎の発症までに間隔があり,HBV増殖早期に核酸アナログを投与することにより,肝炎の発症を阻止することが可能と考えられる.
Theme Liver and Immunity
Title De novo Hepatitis B Virus (HBV)-Related Hepatitis
Author Makoto Oketani Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Hirofumi Uto Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Akio Ido Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Hirohito Tsubouchi Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
[ Summary ] De novo hepatitis B virus(HBV)-related hepatitis develops in patients who are considered to be in post-hepatitis B status after immuno-suppressive therapy or chemotherapy. Negative HBsAg status and positive HBcAb and/or HBsAb status is an indication of post-hepatitis B status. The causes of de novo HBV-related hepatitis are diverse. The risk of developing de novo HBV-related hepatitis and the clinical course of hepatitis differ in relation to the extent of immune suppression. De novo HBV-related hepatitis induced by rituximab plus a regimen incorporating steroids is associated with a higher risk of fulminant hepatitis and mortality. In de novo HBV-related hepatitis, the interval between cessation of therapy and HBV DNA elevation, and HBV DNA elevation and onset of hepatitis are longer than those observed in HBV reactivation from HBsAg positive inactive carriers. When HBV DNA is detectable during or after immuno-suppressive therapy, prompt administration of a nucleoside analog is efficacious for prevention of de novo HBV-related hepatitis.
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