View : 15 Download: 0

Rat embryo fibroblasts require both the cell-binding and the heparin-binding domains of fibronectin for survival

Title
Rat embryo fibroblasts require both the cell-binding and the heparin-binding domains of fibronectin for survival
Authors
Jeong J.Han I.Lim Y.Kim J.Park I.Woods A.Couchman J.R.Oh E.-S.
Ewha Authors
오억수
SCOPUS Author ID
오억수scopus
Issue Date
2001
Journal Title
Biochemical Journal
ISSN
0264-6021JCR Link
Citation
vol. 356, no. 2, pp. 531 - 537
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Fibronectin (FN) is known to transduce signal(s) to rescue cells from detachment-induced apoptosis (anoikis) through an integrin-mediated survival pathway. However, the functions of individual FN domains have not been studied in detail. In the present study we investigated whether the interaction of the cell-binding domain of FN with integrin is sufficient to rescue rat embryo fibroblasts (REFs) from detachment-induced apoptosis. REFs attached and spread normally after plating on substrates coated with either intact FN or a FN fragment, FN120, that contains the cell-binding domain but lacks the C-terminal heparin-binding domain, HepII. REFs on FN maintained a well-spread fibroblastic shape and even proliferated in serum-free medium at 20 h after plating. In contrast, previously well-spread REFs on FN120 started losing fibroblastic shape with time and detached from FN120-coated plates after approx. 8 h. Nuclear condensation indicated apototic cell death. This was due to the decreased activity/stability of focal adhesion kinase (pp125FAK) in the absence of HepII domain. A peptide in the HepII domain [peptide V, WQPPRARI (single-letter amino acid codes)], which has previously been implicated in cytoskeletal organization, rescued apoptotic changes. Consistently, pp125FAK phosphorylation was increased, and both cleavage of pp125FAK and activation of caspase 3 on FN120 were partly blocked by peptide V. Thus the interaction of the cell-binding domain with integrin has a major role in cell survival but is itself not sufficient for cell survival. One or more additional survival signals come from the HepII domain to regulate pp125FAK activity/stability.
DOI
10.1042/0264-6021:3560531
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE