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Modulation Of Thr Phosphorylation Of Integrin β1 During Muscle Differentiation*

Seon-Myung Kim, M. S. Kwon, C. Park, Kyeong-Rock Choi, J. Chun, Joohong Ahn, W. K. Song
Published 2004 · Biology, Medicine

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By using transient elevations of cytosolic free calcium levels triggered by integrin antibody or laminin (Kwon, M. S., Park, C. S., Choi, K., Park, C.-S., Ahnn, J., Kim, J. I., Eom, S. H., Kaufman, S. J., and Song, W. K. (2000) Mol. Biol. Cell 11, 1433-1443), we have demonstrated that protein phosphatase 2A (PP2A) is implicated in the regulation of reversible phosphorylation of integrin. In E63 skeletal myoblasts, the treatment of PP2A inhibitors such as okadaic acid and endothall induces an increase of phosphorylation of integrin β1A and thereby inhibits integrin-induced elevation of cytosolic calcium level and formation of focal adhesions. None of these effects were in differentiated myotubes expressing the alternate β1D isoform. In the presence of okadaic acid, PP2A in association with integrin β1A was reduced on myoblasts, whereas β1D on myotubes remained bound with PP2A. Both co-immunoprecipitation and in vitro phosphatase assays revealed that dephosphorylation of residues Thr788-Thr789 in the integrin β1A cytoplasmic domain is dependent upon PP2A activity. Mutational analysis of the cytoplasmic domain and confocal microscopy experiments indicated that substitution of Thr788-Thr789 with Asn788—Asn789 is of critical importance for regulating the function of integrin β1. These results suggest that PP2A may be a primary regulator of threonine phosphorylation of integrin β1A and subsequent activation of downstream signaling molecules. Taken together, we propose that dephosphorylation of residues Thr788-Thr789 in the cytoplasmic domain of integrin β1A may contribute to the linkage of integrins to focal adhesion sites and induce the association with cytoskeleton proteins. The switch of integrin β1A to β1D isoform in myotubes therefore may be a mechanism to escape from phospho-regulation by PP2A and promotes a more stable association of the cytoskeleton with the extracellular matrix.
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