A lymphotoxin-driven pathway to hepatocellular carcinoma.

A lymphotoxin-driven pathway to hepatocellular carcinoma.
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DOI:
10.1016/j.ccr.2009.08.021
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发表时间:
2009-10-06
期刊:
影响因子:
50.3
通讯作者:
Heikenwalder M
Heikenwalder M
中科院分区:
医学1区
文献类型:
--
作者:
Haybaeck J;Zeller N;Wolf MJ;Weber A;Wagner U;Kurrer MO;Bremer J;Iezzi G;Graf R;Clavien PA;Thimme R;Blum H;Nedospasov SA;Zatloukal K;Ramzan M;Ciesek S;Pietschmann T;Marche PN;Karin M;Kopf M;Browning JL;Aguzzi A;Heikenwalder M

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乙型和丙型肝炎病毒(乙肝病毒、丙型肝炎病毒)引起慢性肝炎和肝细胞癌的机制尚不清楚。我们发现细胞因子淋巴毒素(LT)α,β及其受体(LTβR)在乙肝病毒或丙型肝炎诱导的肝炎和肝细胞癌中表达上调。小鼠肝脏特异性LTαβ表达可诱导肝脏炎症和肝细胞癌,从而将肝组织LT过度表达与肝炎和肝细胞癌联系起来。肝细胞癌由部分A6+卵圆细胞组成,其发生依赖于肝细胞表达的淋巴细胞和IKappa B激酶β,但不依赖于肿瘤坏死因子受体1。在体内,LTβR的刺激意味着肝细胞是LT反应的主要肝细胞,在LTβ转基因肝炎小鼠中抑制LTαβR可抑制肝细胞癌的形成。因此,持续的LT信号代表了一条参与肝炎诱导的肝细胞癌的途径。
Hepatitis B and C viruses (HBV, HCV) cause chronic hepatitis and hepatocellular carcinoma (HCC) by poorly understood mechanisms. We show that cytokines lymphotoxin (LT) α, β and their receptor (LTβR) are upregulated in HBV- or HCV-induced hepatitis and HCC. Liver-specific LTαβ expression in mice induces liver inflammation and HCC causally linking hepatic LT overexpression to hepatitis and HCC. Development of HCC, composed in part of A6+ oval cells, depends on lymphocytes and IKappa B kinase β expressed by hepatocytes but is independent of TNFR1. In vivo LTβR stimulation implicates hepatocytes as the major LT-responsive liver cells and LTβR inhibition in LTαβ-transgenic mice with hepatitis suppresses HCC formation. Thus, sustained LT signaling represents a pathway involved in hepatitis-induced HCC.
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