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AJP - Regulatory, Integrative and Comparative Physiology, Vol 268, Issue 6 1442-R1448, Copyright © 1995 by American Physiological Society
ARTICLES |
F. J. Salazar, M. T. Llinas, J. D. Gonzalez, T. Quesada and J. M. Pinilla
Departamento de Fisiologia, Facultad de Medicina, Murcia, Spain.
The objective of the present study was to examine, in anesthetized dogs, the possible interaction between prostaglandins (PG) and nitric oxide (NO) in mediating the renal response to an extracellular volume expansion (ECVE). The renal response to ECVE was examined during 1) intrarenal infusion of a PG synthesis inhibitor, 2) intrarenal administration of a NO synthesis inhibitor, and 3) simultaneous inhibition of PG and NO synthesis in the right kidney. Compared with the control group, the ECVE-induced increments in sodium excretion and fractional excretion of lithium were not affected by the PG synthesis inhibition. The NO synthesis inhibition did not induce changes in renal hemodynamics but reduced (P < 0.05) the ECVE-induced increments in sodium excretion and fractional excretion of lithium. When PG and NO synthesis were simultaneously inhibited in the right kidney during ECVE, there were no significant differences between the renal hemodynamics of both kidneys. However, compared with the left kidney, the ECVE-induced changes in sodium excretion and fractional excretion of lithium were reduced in the right kidney. The reduction of the natriuretic response to ECVE was greater (P < 0.05) than in the dogs where only NO synthesis was inhibited. Our results suggest a major interaction between NO and PG in mediating the renal hemodynamic and excretory responses to an increase in extracellular volume.
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