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• W2022453973 abstract "It is well established that a biphasic relationship exists between the adhesive strength of beta1 integrins and their ability to mediate cell movement. Thus, cell movement increases progressively with adhesive strength, but beyond a certain point of optimal interaction, cell movement is reduced with further increases in adhesive function. The interplay between the various kinase and phosphatase activities provides the balance in beta1 integrin-mediated cell adhesion and migration. In the present study, the significance of protein tyrosine phosphatases (PTP) and ser/thr protein phosphatases (PP) in alpha4beta1 and alpha5beta1 integrin-mediated mouse melanoma B16F1 cell anchorage and migration on fibronectin was characterized using phosphatase inhibitors. At low fibronectin concentration, alpha5beta1 functioned as the predominant receptor for cell movement; a role for alpha4beta1 in B16F1 cell migration increased progressively with fibronectin concentration. Treatment of B16F1 cells with PTP inhibitors, sodium orthovanadate (Na3VO4) and phenylarsine oxide (PAO), or PP-1/2A inhibitor, okadaic acid (OA), abolished cell movement. Inhibition of cell movement by PAO and OA was associated by a reduction in the adhesive strength of alpha4beta1 and alpha5beta1. In contrast, treatment of B16F1 cells with Na3VO4 resulted in selective stimulation of the adhesive function of alpha5beta1, but not alpha4beta1. Therefore, our results demonstrate that (i) both PTP and PP-1/2A have roles in cell movement, (ii) modulation of cell movement by PTP and PP-1/2A may involve either a stimulation or reduction of beta1 integrin adhesive strength, and (iii) distinct phosphatase-mediated signaling pathways for differential regulation of the various beta1 integrins exist." @default.
• W2022453973 created "2016-06-24" @default.
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• W2022453973 date "1999-10-01" @default.
• W2022453973 modified "2023-09-25" @default.
• W2022453973 title "Differences in phosphatase modulation of α4 β1 and α5 β1 integrin-mediated adhesion and migration of B16F1 cells" @default.
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• W2022453973 doi "https://doi.org/10.1139/o99-050" @default.
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