Integrin α1β1 (VLA‐1) mediates adhesion of activated intraepithelial lymphocytes to collagen
Integrin α1β1 (VLA‐1) mediates adhesion of activated intraepithelial lymphocytes to collagen
复制标题
整合素α1β1(VLA-1)介导活化的上皮内淋巴细胞与胶原蛋白的粘附
DOI:
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发表时间:
1999
期刊:
影响因子:
--
通讯作者:
E. Ebert
中科院分区:
文献类型:
--
作者:
A. Roberts;Robin Brolin;E. Ebert
Intraepithelial lymphocytes (IELs) from human intestinal epithelium are memory CD8+ T cells that bind to epithelial cells through human mycosal lymphocyte (HML)‐1 and to mesenchymal cells through very late activation antigen‐4 (VLA‐4). Their binding of extracellular matrix proteins and the mechanism involved were tested. Activated 51Cr‐labelled lymphocytes were incubated in protein‐coated microwells with various additives. After washing, the adherent cells were detected by radioactivity. The percentages of activated IELs that bound to collagen types I and IV were 20 and 31%, respectively; fewer bound to fibronectin or laminin. Compared to interleukin‐2‐activated peripheral blood CD8+ T lymphocytes, more IELs bound collagen IV and fewer bound fibronectin. IEL adhesion to collagen (but not fibronectin or laminin) was up‐regulated by antibody ligation of CD2 or by protein kinase C stimulation by phorbol ester; staurosporine reduced binding, while herbimycin, phytohaemagglutinin and CD3 ligation had no effect. Antibody‐blocking of integrin VLA‐1 subunits α1 (CD49a) and β1 (CD18) inhibited adhesion to collagen type I by 82±6% and to type IV by 94±1% (P<0·001), implicating VLA‐1 as the main collagen receptor for IELs. Cell adhesion was dependent on extracellular divalent cations, a characteristic event of VLA‐1 never before shown for IELs: manganese and magnesium ions supported binding in a dose‐dependent manner; calcium ions inhibited their effectiveness. Therefore, IELs bind collagen through integrin α1β1 after protein kinase C activation. Adhesion is modulated by divalent cations.
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影响因子:
4.3
作者:
Ebert,EC
通讯作者:
Ebert,EC
DOI:
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发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
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作者:
Kern,A;Briesewitz,R;Bank,I;Marcantonio,EE
通讯作者:
Marcantonio,EE
DOI:
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发表时间:
1991
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Chan,BM;Wong,JG;Rao,A;Hemler,ME
通讯作者:
Hemler,ME
DOI:
10.1006/cimm.1996.0013
发表时间:
1996
期刊:
Cellular immunology.
影响因子:
--
作者:
Ebert,EC;Roberts,AI
通讯作者:
Roberts,AI
DOI:
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发表时间:
1994
期刊:
The American journal of pathology
影响因子:
--
作者:
Skinner,MP;Raines,EW;Ross,R
通讯作者:
Ross,R