Abstract
ABSTRACT The interaction of cells with components of the extracellular matrix through their integrin receptors results in the stimulation of tyrosine phosphorylation of several proteins, suggesting that these receptors play a key role in signal transduction. Here we report that antibody-mediated ligation and clustering of α3β1 and α6β1/α6β4 integrins resulted in the stimulation of tyrosine phosphorylation of proteins that are specific for each heterodimer. Thus, ligation and clustering of the α3β1 integrin on human prostate carcinoma cells (PC-3) and human umbilical vein endothelial cells (HUVEC) with anti-α3 antibodies resulted in the stimulation of tyrosine phosphorylation of a 55 kDa protein. In contrast, ligation and clustering of the α6β1 integrin on these cells with anti-α6 antibody resulted in the dramatic stimulation of tyrosine phosphorylation of a 90 kDa protein in addition to a 52 kDa protein, and ligation and clustering of α5β1 on HUVEC did not result in the apparent stimulation of tyrosine phosphorylation of any proteins. Clustering with anti-β1 antibodies triggered the tyrosine phosphorylation of all of these proteins, whereas ligation and clustering of PC-3 cells with an anti-β4 antibody resulted in the tyrosine phosphorylation of a distinct 62 kDa protein. Since the PC-3 cells express both α6β1 and α6β4, these data suggest that these two receptors can transduce distinct signals. All of the phosphorylations could be inhibited by treating the cells with Genistein, a tyrosine kinase inhibitor. Antibody-mediated ligation and clustering of integrins on the two types of cells did not result in the stimulation of tyrosine phosphorylation of pp125 focal adhesion kinase, although this was observed upon cell attachment and spreading on fibronectin, laminin and anti-α3 monoclonal antibody. Collectively, these data demonstrate that cross-linking of different integrin het-erodimers can stimulate tyrosine kinase activities, leading to the phosphorylation of distinct proteins, which are also different from those observed when cells are allowed to spread on a matrix.
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Dates
Type | When |
---|---|
Created | 4 years, 4 months ago (April 25, 2021, 12:15 p.m.) |
Deposited | 1 year, 8 months ago (Dec. 23, 2023, 8:04 p.m.) |
Indexed | 1 month, 2 weeks ago (July 12, 2025, 6:51 p.m.) |
Issued | 30 years, 6 months ago (March 1, 1995) |
Published | 30 years, 6 months ago (March 1, 1995) |
Published Online | 30 years, 6 months ago (March 1, 1995) |
Published Print | 30 years, 6 months ago (March 1, 1995) |
@article{Jewell_1995, title={Stimulation of tyrosine phosphorylation of distinct proteins in response to antibody-mediated ligation and clustering of α3 and α6 integrins}, volume={108}, ISSN={1477-9137}, url={http://dx.doi.org/10.1242/jcs.108.3.1165}, DOI={10.1242/jcs.108.3.1165}, number={3}, journal={Journal of Cell Science}, publisher={The Company of Biologists}, author={Jewell, Kevin and Kapron-Bras, Carolyn and Jeevaratnam, Premala and Dedhar, Shoukat}, year={1995}, month=mar, pages={1165–1174} }