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. 1984 Jul;352:527–538. doi: 10.1113/jphysiol.1984.sp015308

The subtype of alpha-adrenoceptor involved in the neural control of renal tubular sodium reabsorption in the rabbit.

I F Hesse, E J Johns
PMCID: PMC1193228  PMID: 6086915

Abstract

A study was undertaken in pentobarbitone anaesthetized rabbits, undergoing a saline diuresis, to determine the subtype of alpha-adrenoceptor mediating renal tubular sodium reabsorption. Stimulation of the renal nerves at low rates, to cause an 11% fall in renal blood flow, did not change glomerular filtration rate but significantly reduced urine flow rate, and absolute and fractional sodium excretions by approximately 40%. These responses were reproducible in different groups of animals and with time. Renal nerve stimulation during an intra-renal arterial infusion of prazosin, to block alpha 1-adrenoceptors, had no effect on the renal haemodynamic response but completely abolished the reductions in urine flow rate, and absolute and fractional sodium excretion. During intra-renal arterial infusion of yohimbine, to block renal alpha 2-adrenoceptors, stimulation of the renal nerves to cause similar renal haemodynamic changes resulted in significantly larger reductions in urine flow rate, and absolute and fractional sodium excretion of about 52-58%. These results indicate that in the rabbit alpha 1-adrenoceptors are present on the renal tubules, which mediate the increase in sodium reabsorption caused by renal nerve stimulation. They further suggest the presence of presynaptic alpha 2-adrenoceptors on those nerves innervating the renal tubules.

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Selected References

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