Requirement for the synergy site for cell adhesion to fibronectin depends on the activation state of integrin alpha 5 beta 1.

The Journal of Biological Chemistry
E H DanenG N Van Muijen

Abstract

We investigated the influence of the activation state of integrin alpha 5 beta 1 on its dependence on the PHSRN synergy site for binding to RGD in fibronectin. K562 and MV3 cells lacked alpha v beta 3 expression and adhered to fibronectin through alpha 5 beta 1. Mel57 cells adhered through alpha v beta 3 and alpha 5 beta 1. A recombinant fibronectin polypeptide, containing five type III repeats from the central cell binding domain 3Fn6-10, and a mutated polypeptide lacking the synergy site were equally effective in promoting Mel57 adhesion. For K562 and MV3, the mutated polypeptide was not or poorly active compared to the control polypeptide. Expression of alpha v beta 3 in MV3 induced strong adhesion to the mutated polypeptide. TS2/16 stimulatory beta 1-integrin antibodies or Mn2+ induced alpha 5 beta 1-mediated adhesion of K562 and MV3 to GRGDSP. In the presence of TS2/16 or Mn2+, alpha 5 beta 1-mediated MV3 adhesion to the mutated polypeptide was equally strong as adhesion to the control polypeptide. Mn2+ or TS2/16 induced weak K562 binding to the mutated polypeptide, and in the presence of a combination of phorbol 12-myristate 13-acetate, Mn2+, and TS2/16, alpha 5 beta 1-mediated K562 adhesion to the mutated and control pol...Continue Reading

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