CXC Chemokine Ligand 4 (CXCL4) Is a Platelet-Derived Mediator of Experimental Liver Fibrosis

被引:128
|
作者
Zaldivar, Mirko Moreno
Pauels, Katrin
von Hundelshausen, Philipp [3 ]
Berres, Marie-Luise
Schmitz, Petra
Bornemann, Joerg [3 ]
Kowalska, M. Anna [6 ]
Gassler, Nikolaus [4 ]
Streetz, Konrad L.
Weiskirchen, Ralf [5 ]
Trautwein, Christian
Weber, Christian [2 ]
Wasmuth, Hermann E. [1 ]
机构
[1] Univ Hosp Aachen, Rhein Westfal TH Aachen, Dept Med 3, D-52074 Aachen, Germany
[2] Univ Hosp Aachen, Inst Mol Cardiovasc Res, D-52074 Aachen, Germany
[3] Univ Hosp Aachen, Dept Med 1, D-52074 Aachen, Germany
[4] Univ Hosp Aachen, Inst Pathol, D-52074 Aachen, Germany
[5] Univ Hosp Aachen, Inst Clin Chem & Pathobiochem, D-52074 Aachen, Germany
[6] Childrens Hosp Philadelphia, Dept Hematol, Philadelphia, PA 19104 USA
关键词
CHRONIC HEPATITIS; MECHANISMS; PLATELET-FACTOR-4; ATHEROSCLEROSIS; FIBROGENESIS; COAGULATION; RECEPTOR; VARIANT; REPAIR; CELLS;
D O I
10.1002/hep.23435
中图分类号
R57 [消化系及腹部疾病];
学科分类号
摘要
Liver fibrosis is a major cause of morbidity and mortality worldwide. Platelets are involved in liver damage, but the underlying molecular mechanisms remain elusive. Here, we investigate the platelet-derived chemokine (C-X-C motif) ligand 4 (CXCL4) as a molecular mediator of fibrotic liver damage. Serum concentrations and intrahepatic messenger RNA of CXCL4 were measured in patients with chronic liver diseases and mice after toxic liver injury. Platelet aggregation in early fibrosis was determined by electron microscopy in patients and by immunohistochemistry in mice. Cxcl4(-/-) and wild-type mice were subjected to two models of chronic liver injury (CCl4 and thioacetamide). The fibrotic phenotype was analyzed by histological, biochemical, and molecular analyses. Intrahepatic infiltration of immune cells was investigated by fluorescence-activated cell sorting, and stellate cells were stimulated with recombinant Cxcl4 in vitro. The results showed that patients with advanced hepatitis C virus-induced fibrosis or nonalcoholic steatohepatitis had increased serum levels and intrahepatic CXCL4 messenger RNA concentrations. Platelets were found directly adjacent to collagen fibrils. The CCl4 and thioacetamide treatment led to an increase of hepatic Cxcl4 levels, platelet activation, and aggregation in early fibrosis in mice. Accordingly, genetic deletion of Cxcl4 in mice significantly reduced histological and biochemical liver damage in vivo, which was accompanied by changes in the expression of fibrosis-related genes (Timp-1 [tissue inhibitor of matrix metalloproteinase 1], Mmp9 [matrix metalloproteinase 9], Tgf-beta [transforming growth factor beta], IL10 [interleukin 10]). Functionally, Cxcl4(-/-) mice showed a strongly decreased infiltration of neutrophils (Ly6G) and CD8(+) T cells into the liver. In vitro, recombinant murine Cxcl4 stimulated the proliferation, chemotaxis, and chemokine expression of hepatic stellate cells. Conclusion.. The results underscore an important role of platelets in chronic liver damage and imply a new target for antifibrotic therapies. (HEPATOLOGY 2010;51:1345-1353.)
引用
收藏
页码:1345 / 1353
页数:9
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