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• W2149332448 abstract "Although the amiloride-sensitive epithelial sodium channel (ENaC) plays an important role in the modulation of alveolar liquid clearance, the precise mechanism of its regulation in alveolar epithelial cells is still under investigation. Protein kinase C (PKC) has been shown to alter ENaC expression and activity in renal epithelial cells, but much less is known about its role in alveolar epithelial cells. The objective of this study was to determine whether PKC activation modulates ENaC expression and transepithelial Na + transport in cultured rat alveolar epithelial cells. Alveolar type II cells were isolated and cultured for 3 to 4 d before they were stimulated with phorbol 12-myristate 13-acetate (PMA 100 nmol/L) for 4 to 24 h. PMA treatment significantly decreased α, β, and γENaC expression in a time-dependent manner, whereas an inactive form of phorbol ester had no apparent effect. This inhibitory action was seen with only 5-min exposure to PMA, which suggested that PKC activation was very important for the reduction of αENaC expression. The PKC inhibitors bisindolylmaleimide at 2 µmol/L and Gö6976 at 2 µmol/L diminished the PMA-induced suppression of αENaC expression, while rottlerin at 1 µmol/L had no effect. PMA elicited a decrease in total and amiloride-sensitive current across alveolar epithelial cell monolayers. This decline in amiloride-sensitive current was not blocked by PKC inhibitors except for a partial inhibition with bisindolylmaleimide. PMA induced a decrease in rubidium uptake, indicating potential Na + -K + -ATPase inhibition. However, since ouabain-sensitive current in apically permeabilized epithelial cells was similar in PMA-treated and control cells, the inhibition was most probably related to reduced Na + entry at the apical surface of the cells. We conclude that PKC activation modulates ENaC expression and probably ENaC activity in alveolar epithelial cells. Ca 2+ -dependent PKC is potentially involved in this response.Key words: alveolar epithelial cells, Na + transport, Na + channel, ENaC, protein kinase C, Na + -K + -ATPase, amiloride, gene expression." @default.
• W2149332448 created "2016-06-24" @default.
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• W2149332448 date "2005-11-01" @default.
• W2149332448 modified "2023-10-16" @default.
• W2149332448 title "Modulation of Na+transport and epithelial sodium channel expression by protein kinase C in rat alveolar epithelial cells" @default.
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• W2149332448 doi "https://doi.org/10.1139/y05-071" @default.
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• W2149332448 hasPublicationYear "2005" @default.
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