title: Integrin expression and function in the response of primary culture hepatic stellate cells to connective tissue growth factor (CCN2).
abstract: Production of connective tissue growth factor (CCN2, also known as CTGF) is a hallmark of hepatic fibrosis. This study examined early primary cultures of hepatic stellate cells (HSC) for (i) CCN2 regulation of its cognate receptor integrin subunits; and (ii) interactions between CCN2 and integrin α(5)β(1), heparan sulphate proteoglycans (HSPG) or fibronectin (FN) in supporting cell adhesion. HSC were isolated from healthy male Balb/c mice. mRNA levels of CCN2 or α(5), β(1), αv or β(3) integrin subunits were measured in days 1-7 primary culture HSC, and day 3 or day 7 cells treated with recombinant CCN2 or CCN2 small interfering RNA. Interactions between CCN2 and integrin α(5)β(1), HSPG or FN were investigated using an in vitro cell adhesion assay. Co-incident with autonomous activation over the first 7 days, primary culture HSC increasingly expressed mRNA for CCN2 or integrin subunits. Addition of exogenous CCN2 or knockdown of endogenous CCN2 differentially regulated integrin gene expression in day 3 versus day 7 cells. Either full length CCN2 ('CCN2(1-4)') or residues 247-349 containing module 4 alone ('CCN2(4)') supported day 3 cell adhesion in an integrin α(5)β(1) - and HSPG-dependent fashion. Adhesion of day 3 cells to FN was promoted in an integrin α(5) β(1)-dependent manner by CCN2(1-4) or CCN2(4), whereas FN promoted HSPG-dependent HSC adhesion to CCN2(1-4) or CCN2(4). These findings suggest CCN2 regulates integrin expression in primary culture HSC and supports HSC adhesion via its binding of cell surface integrin α(5)β(1), a novel CCN2 receptor in primary culture HSC which interacts co-operatively with HSPG or FN.
authors.affiliation: Center for Clinical and Translational Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA.
authors.forename: Guangcun
authors.initials: G
authors.lastname: Huang
authors.forename: David R
authors.initials: DR
authors.lastname: Brigstock
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D002478:Cells, Cultured; D055513:Connective Tissue Growth Factor / Q000235:genetics / Q000378:metabolism*; D005353:Fibronectins / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006493:Heparin / Q000031:analogs & derivatives / Q000378:metabolism; D055166:Hepatic Stellate Cells / Q000166:cytology / Q000378:metabolism*; D039081:Integrin alpha5beta1 / Q000235:genetics / Q000378:metabolism*; D008103:Liver Cirrhosis / Q000378:metabolism / Q000503:physiopathology; D051379:Mice; D008807:Mice, Inbred BALB C; D011509:Proteoglycans / Q000378:metabolism; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics
chemical_list: C526318:CCN2 protein, mouse; D005353:Fibronectins; D039081:Integrin alpha5beta1; D011509:Proteoglycans; D034741:RNA, Small Interfering; C036090:heparin proteoglycan; D055513:Connective Tissue Growth Factor; D006493:Heparin
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