Relationship of serine/threonine phosphorylation/dephosphorylation signaling to glucocorticoid regulation of tight junction permeability and ZO-1 distribution in nontransformed mammary epithelial cells.


The synthetic glucocorticoid dexamethasone regulates tight junction permeability resulting in an increased transepithelial electrical resistance (TER) of cultured 31EG4 mammary epithelial cells. Inhibition of cellular type 1 and type 2A protein phosphatase activity by okadaic acid reduced the TER of dexamethasone-treated monolayers of 31EG4 cells to basal… (More)


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