肝纤维化
TLR4型
巨噬细胞
肝星状细胞
S100A9型
基因剔除小鼠
纤维化
下调和上调
癌症研究
化学
神经营养因子
细胞生物学
信号转导
免疫学
生物
炎症
医学
受体
病理
生物化学
基因
体外
作者
Chao Hou,Dong Wang,Mingxia Zhao,Petek Ballar,Xinru Zhang,Qiong Mei,Wei Wang,Xiang Li,Quan Z. Sheng,Jun Li,Chuan-Sheng Wei,Yujun Shen,Yi Yang,Peng Wang,Juntang Shao,Shuxiang Xu,Fuyan Wang,Yang Sun,Yujun Shen
标识
DOI:10.1016/j.apsb.2023.07.027
摘要
The mesencephalic astrocyte-derived neurotrophic factor (MANF) has been recently identified as a neurotrophic factor, but its role in hepatic fibrosis is unknown. Here, we found that MANF was upregulated in the fibrotic liver tissues of the patients with chronic liver diseases and of mice treated with CCl4. MANF deficiency in either hepatocytes or hepatic mono-macrophages, particularly in hepatic mono-macrophages, clearly exacerbated hepatic fibrosis. Myeloid-specific MANF knockout increased the population of hepatic Ly6Chigh macrophages and promoted HSCs activation. Furthermore, MANF-sufficient macrophages (from WT mice) transfusion ameliorated CCl4-induced hepatic fibrosis in myeloid cells-specific MANF knockout (MKO) mice. Mechanistically, MANF interacted with S100A8 to competitively block S100A8/A9 heterodimer formation and inhibited S100A8/A9-mediated TLR4–NF-κB signal activation. Pharmacologically, systemic administration of recombinant human MANF significantly alleviated CCl4-induced hepatic fibrosis in both WT and hepatocytes-specific MANF knockout (HKO) mice. This study reveals a mechanism by which MANF targets S100A8/A9-TLR4 as a “brake” on the upstream of NF-κB pathway, which exerts an impact on macrophage differentiation and shed light on hepatic fibrosis treatment.
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