The Journal of Cell Biology, Vol 109, 409-420, Copyright © 1989 by The Rockefeller University Press

ARTICLES

Integrin heterodimer and receptor complexity in avian and mammalian cells

RO Hynes, EE Marcantonio, MA Stepp, LA Urry and GH Yee
Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139.

We report data showing that the integrin receptor complex in chickens contains several discrete heterodimers all sharing the beta 1-integrin subunit combined separately with different alpha-subunits. Using antisera to synthetic peptides based on cDNA sequences of chicken and human alpha-integrin subunits to analyze the integrin complement of avian and mammalian cells, we show that band 2 of the chicken integrin complex contains alpha-subunits related to both alpha 3- and alpha 5- subunits of human integrins. alpha 3 beta 1 and alpha 5 beta 1 have both previously been shown in human cells to be fibronectin receptors and alpha 3 beta 1 can also act as a receptor for laminin and collagen. We also provide evidence for the presence, in band 1 of the chicken integrin complex, of a third integrin alpha-subunit which is also alpha 5 related. This integrin subunit exists in a separate heterodimer complex with beta 1 and binds to fibronectin-affinity columns. These results provide explanations for published data showing that the avian integrin complex contains receptor activity for a variety of extracellular matrix proteins. We conclude that the chicken integrin complex comprises a set of beta 1-integrin heterodimers equivalent to the human VLA antigens and includes at least two fibronectin receptors. Finally, we show that chicken embryo fibroblasts also contain a beta 3- class integrin related to the RGD receptors defined in various human cells.
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