The blood pressure decrease-induced sympathetic discharge following atrial natriuretic factor administration may offset its natriuretic action

Otto Kuchel, Raul Garcia, Waldemar Debinski, Karoly Racz, Nguyen T. Buu, Marc Cantin, Jacques Genest

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6 Citations (Scopus)

Abstract

Conscious SHR and WKY rats were infused during 7 days with ANF (Arg 101-Tyr 126), 100 ng/hr/rat, by means of miniosmotic pumps and their basal blood pressure (BP), changes in sodium excretion and urinary catecholamines compared with those at the last day of the infusion. The SHR initial BP of 181 ± 3 mmHg gradually declined to 137 ± 5 mmHg. No significant change in blood pressure was observed in the ANF-infused WKY group. However, WKY rats exhibited an increased sodium excretion and urinary dopamine/norepinephrine ratio when compared to sham-infused rats. No such differences were observed in SHR. It is suggested that an ANF-induced withdrawal of the renal sympathetic tone permits the manifestation of its natriuretic action in WKY rats. When, however, a BP decrease predominates, as in SHR, this decrease results in a reflex sympathetic discharge with a renal sympathetic activity overriding the ANF induced natriuresis seen in WKY rats. Secondary sympathetic responses to the ANF-induced BP decrease have to be thus taken into account when a dissociation between the hypotensive and natriuretic action of ANF is observed in vivo.

Original languageEnglish
Pages (from-to)570-575
Number of pages6
JournalProceedings of the Society for Experimental Biology and Medicine
Volume182
Issue number4
DOIs
Publication statusPublished - Sep 1986

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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