Distinct action of flavonoids, myricetin and quercetin, on epithelial Cl⁻ secretion: useful tools as regulators of Cl⁻ secretion.

Abstract:

:Epithelial Cl(-) secretion plays important roles in water secretion preventing bacterial/viral infection and regulation of body fluid. We previously suggested that quercetin would be a useful compound for maintaining epithelial Cl(-) secretion at a moderate level irrespective of cAMP-induced stimulation. However, we need a compound that stimulates epithelial Cl(-) secretion even under cAMP-stimulated conditions, since in some cases epithelial Cl(-) secretion is not large enough even under cAMP-stimulated conditions. We demonstrated that quercetin and myricetin, flavonoids, stimulated epithelial Cl(-) secretion under basal conditions in epithelial A6 cells. We used forskolin, which activates adenylyl cyclase increasing cytosolic cAMP concentrations, to study the effects of quercetin and myricetin on cAMP-stimulated epithelial Cl(-) secretion. In the presence of forskolin, quercetin diminished epithelial Cl(-) secretion to a level similar to that with quercetin alone without forskolin. Conversely, myricetin further stimulated epithelial Cl(-) secretion even under forskolin-stimulated conditions. This suggests that the action of myricetin is via a cAMP-independent pathway. Therefore, myricetin may be a potentially useful compound to increase epithelial Cl(-) secretion under cAMP-stimulated conditions. In conclusion, myricetin would be a useful compound for prevention from bacterial/viral infection even under conditions that the amount of water secretion driven by cAMP-stimulated epithelial Cl(-) secretion is insufficient.

journal_name

Biomed Res Int

authors

Sun H,Niisato N,Nishio K,Hamilton KL,Marunaka Y

doi

10.1155/2014/902735

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

902735

eissn

2314-6133

issn

2314-6141

journal_volume

2014

pub_type

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