Loss of endothelin B receptor function impairs sodium excretion in a time--and sex-dependent manner

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Publisher: American Physiological Society
Document Type: Author abstract; Report
Length: 262 words

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Abstract :

--Recent studies suggested a direct link between circadian rhythms and regulation of sodium excretion. Endothelin-1 (ET-I) regulates sodium balance by promoting natriuresis through the endothelin B receptor ([ET.sub.B]) in response to increased salt in the diet, but the effect that the time of day has on this natriuretic response is not known. Therefore, this study was designed to test the hypothesis that ETu receptor activation contributes to the diurnal control of sodium excretion and that sex differences contribute to this control as well. Twelve-hour urine collections were used to measure sodium excretion. On day 3 of the experiment, a NaCl load (900 [micro]eq) was given by oral gavage either at Zeitgeber time [ZT] 0 (inactive period) or ZTI2 (active period) to examine the natriuretic response to the acute salt load. Male and female [ET.sub.B]-delicient ([ET.sub.B] def) rats showed an impaired natriuretic response to a salt load at ZT0 compared with their respective transgenic controls (Tg cont). Male [ET.sub.B] def rats showed a delayed natriuretic response to a salt load given at ZTI2 compared with male Tg cont, a contrast to the prompt response shown by female [ET.sub.B] def rats. Treatment with ABT-627, an [ET.sub.A] receptor antagonist, improved the natriuretic response seen within the first 12 h of a ZT0 salt load in both sexes. These findings demonstrate that diurnal excretion of an acute salt load I) requires ET-1 and the [ET.sub.B] receptor, 2) is more evident in male vs. female rats, and 3) is opposed by the [ET.sub.A] receptor. ETB receptors: ETA receptors; circadian rhythm; kidney; male and female; rats doi: 10.1152/ajprenal.00103.2016.

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Gale Document Number: GALE|A474041894