The extracellular matrix molecule hyaluronan was found to suppress platelet-derived growth factor (PDGF) beta-receptor activation and PDGF-BB-induced migration of primary human dermal fibroblasts. The suppressive effect of hyaluronan was neutralized by a monoclonal antibody that specifically inhibits hyaluronan binding to its receptor CD44. Moreover, co-immunoprecipitation experiments showed that the PDGF beta-receptor and CD44 can form a complex. Interestingly, the inhibitory effect of hyaluronan on PDGF beta-receptor activation was not seen in the presence of the tyrosine phosphatase inhibitor pervanadate. Our observations suggest that hyaluronan suppresses PDGF beta-receptor activation by recruiting a CD44-associated tyrosine phosphatase to the receptor.
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