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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
Actions of quercetin, a flavonoid, on ion transporters: its physiological roles.
Flavonoids keep us healthy by controlling various body and cellular functions. It is well known that cations, such as Na+ , K+ , and Ca2+ , play important roles in the regulation of body and cellular functions, including generation of action potentials and the resting membrane potential of neural and muscle cells and signal transduction as intracellular second messengers. However, we have little information on the physiological roles of anions, particularly Cl- , in body and cellular functions. Quercetin, a flavonoid, stimulates Na+ -K+ -2Cl- cotransporter 1 (NKCC1), which is one of the most important ion transporters regulating the cytosolic Cl- concentration ([Cl- ]c ). Here, we introduce the molecular mechanism by which flavonoids, specifically quercetin, act through elevation of [Cl- ]c via activation of NKCC1 on important factors controlling various body and cellular functions, such as (1) antihypertensive actions controlling blood volume dependent on the amounts of renal Na+ reabsorption via expression of the epithelial Na+ channel, (2) neurite-elongating actions via polymerization of tubulin by inhibiting GTPase activity, and (3) antibacterial and antiviral infective actions through stimulation of epithelial Cl- secretion by increasing the driving force for epithelial Cl- secretion.
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