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Induction of Gas6 protein in CCl 4 ‐induced rat liver injury and anti‐apoptotic effect on hepatic stellate cells

Induction of Gas6 protein in CCl 4 ‐induced rat liver injury and anti‐apoptotic effect on hepatic... The protein product of the growth arrest–specific gene 6 (Gas6) is a secreted ligand for tyrosine kinase receptors, among which Axl is the most widely distributed and displays the highest affinity for Gas6. The Gas6/Axl signaling pathway has been increasingly implicated in growth and survival processes occurring during development and tissue repair. In liver, after an acute or chronic injury, repair involves macrophages and hepatic stellate cells (HSC) activated into myofibroblastic cells (HSC/MFB), which produce cytokines and matrix proteins. We investigated the expression and the role of Gas6 and its receptor Axl in liver repair. Three days after CCl4‐induced liver injury in the rat, we detected the expression of Gas6 in ED1‐positive macrophages as well as in desmin‐positive HSC, which accumulated in injured areas. Axl, the high‐affinity receptor for Gas6, was detected in macrophages, HSC, and HSC/MFB. In vitro, expression of γ‐carboxylated Gas6 was strongly induced in HSC along with their transformation into myofibroblasts, and it exerted an anti‐apoptotic effect on both HSC and HSC/MFB mediated by the Axl/PI3‐kinase/Akt pathway. In conclusion, Gas6 is a survival factor for these cells and we suggest that Gas6, secreted by macrophages and HSC/MFB in vivo after liver injury, promotes HSC and HSC/MFB survival and might support transient HSC/MFB accumulation during liver healing. (HEPATOLOGY 2006;44:228‐239.) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hepatology Wolters Kluwer Health

Induction of Gas6 protein in CCl 4 ‐induced rat liver injury and anti‐apoptotic effect on hepatic stellate cells

Induction of Gas6 protein in CCl 4 ‐induced rat liver injury and anti‐apoptotic effect on hepatic stellate cells

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References (63)

Publisher
Wolters Kluwer Health
Copyright
Copyright © 2006 American Association for the study of Liver Diseases
ISSN
0270-9139
eISSN
1527-3350
DOI
10.1002/hep.21237
pmid
16799993
Publisher site
See Article on Publisher Site

Abstract

The protein product of the growth arrest–specific gene 6 (Gas6) is a secreted ligand for tyrosine kinase receptors, among which Axl is the most widely distributed and displays the highest affinity for Gas6. The Gas6/Axl signaling pathway has been increasingly implicated in growth and survival processes occurring during development and tissue repair. In liver, after an acute or chronic injury, repair involves macrophages and hepatic stellate cells (HSC) activated into myofibroblastic cells (HSC/MFB), which produce cytokines and matrix proteins. We investigated the expression and the role of Gas6 and its receptor Axl in liver repair. Three days after CCl4‐induced liver injury in the rat, we detected the expression of Gas6 in ED1‐positive macrophages as well as in desmin‐positive HSC, which accumulated in injured areas. Axl, the high‐affinity receptor for Gas6, was detected in macrophages, HSC, and HSC/MFB. In vitro, expression of γ‐carboxylated Gas6 was strongly induced in HSC along with their transformation into myofibroblasts, and it exerted an anti‐apoptotic effect on both HSC and HSC/MFB mediated by the Axl/PI3‐kinase/Akt pathway. In conclusion, Gas6 is a survival factor for these cells and we suggest that Gas6, secreted by macrophages and HSC/MFB in vivo after liver injury, promotes HSC and HSC/MFB survival and might support transient HSC/MFB accumulation during liver healing. (HEPATOLOGY 2006;44:228‐239.)

Journal

HepatologyWolters Kluwer Health

Published: Jul 1, 2006

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