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Inhibition of Ang II and renal sympathetic nerve influence dopamine-and isoprenaline-induced renal haemodynamic changes in normal Wistar-Kyoto and spontaneously hypertensive rats.
Auton Autacoid Pharmacol. 2008 Oct; 28(4):95-101.AA

Abstract

1. This study was undertaken to elucidate the effects of inhibiting the renin-angiotensin system (RAS) with losartan, and acute unilateral renal denervation on renal haemodynamic responses to intrarenal administration of vasoconstrictor doses of dopamine and vasodilator doses of isoprenaline in Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR). 2. Acute unilateral renal denervation of the left kidney in rats was confirmed by a drop in the renal vasoconstrictor response to renal nerve stimulation (P < 0.05) along with diuresis and natriuresis. Rats were pretreated with losartan for 7 days and thereafter animals fasted overnight were anaesthetized (sodium pentobarbitone, 60 mg/kg i.p.) and acute renal haemodynamic responses studied. 3. Dose-response curves were constructed for dopamine and isoprenaline that induced falls or increases in renal blood flow, respectively. It was observed that renal vascular responses were greater in the denervated as compared with rats with intact renal nerves (all P < 0.05). Dopamine-induced renal vasoconstrictor responses were markedly lower in losartan-treated denervated WKY and SHR compared with their untreated counterparts (all P < 0.05). It was also observed that in losartan-treated and denervated WKY rats the vasodilatory responses to isoprenaline were markedly lower compared with untreated rats (all P < 0.05). However, in SHR, under the same conditions, there was no difference in the renal response to isoprenaline whether or not rats were treated with losartan (P > 0.05). 4. The data obtained showed that the renal vasoconstrictor effect of dopamine depends on intact renal nerves and RAS in WKY and SHR. Isoprenaline responses were likewise sensitive to renal denervation and RAS inhibition in WKY rats but not SHRs. Our observations reveal a possible relationship between renal AT(1) receptors and alpha(1)-adrenoceptors in WKY and SHR. There is also evidence to suggest an interaction between renal beta-adrenoceptors and AT(1) receptors in WKY rats.

Authors+Show Affiliations

School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

18778332

Citation

Abdulla, M H., et al. "Inhibition of Ang II and Renal Sympathetic Nerve Influence Dopamine-and Isoprenaline-induced Renal Haemodynamic Changes in Normal Wistar-Kyoto and Spontaneously Hypertensive Rats." Autonomic & Autacoid Pharmacology, vol. 28, no. 4, 2008, pp. 95-101.
Abdulla MH, Sattar MA, Abdullah NA, et al. Inhibition of Ang II and renal sympathetic nerve influence dopamine-and isoprenaline-induced renal haemodynamic changes in normal Wistar-Kyoto and spontaneously hypertensive rats. Auton Autacoid Pharmacol. 2008;28(4):95-101.
Abdulla, M. H., Sattar, M. A., Abdullah, N. A., Hazim, A. I., Anand Swarup, K. R., Rathore, H. A., Khan, M. A., & Johns, E. J. (2008). Inhibition of Ang II and renal sympathetic nerve influence dopamine-and isoprenaline-induced renal haemodynamic changes in normal Wistar-Kyoto and spontaneously hypertensive rats. Autonomic & Autacoid Pharmacology, 28(4), 95-101. https://doi.org/10.1111/j.1474-8673.2008.00422.x
Abdulla MH, et al. Inhibition of Ang II and Renal Sympathetic Nerve Influence Dopamine-and Isoprenaline-induced Renal Haemodynamic Changes in Normal Wistar-Kyoto and Spontaneously Hypertensive Rats. Auton Autacoid Pharmacol. 2008;28(4):95-101. PubMed PMID: 18778332.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inhibition of Ang II and renal sympathetic nerve influence dopamine-and isoprenaline-induced renal haemodynamic changes in normal Wistar-Kyoto and spontaneously hypertensive rats. AU - Abdulla,M H, AU - Sattar,M A, AU - Abdullah,N A, AU - Hazim,A I, AU - Anand Swarup,K R L, AU - Rathore,H A, AU - Khan,Md A H, AU - Johns,E J, Y1 - 2008/09/05/ PY - 2008/9/10/pubmed PY - 2008/12/17/medline PY - 2008/9/10/entrez SP - 95 EP - 101 JF - Autonomic & autacoid pharmacology JO - Auton Autacoid Pharmacol VL - 28 IS - 4 N2 - 1. This study was undertaken to elucidate the effects of inhibiting the renin-angiotensin system (RAS) with losartan, and acute unilateral renal denervation on renal haemodynamic responses to intrarenal administration of vasoconstrictor doses of dopamine and vasodilator doses of isoprenaline in Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR). 2. Acute unilateral renal denervation of the left kidney in rats was confirmed by a drop in the renal vasoconstrictor response to renal nerve stimulation (P < 0.05) along with diuresis and natriuresis. Rats were pretreated with losartan for 7 days and thereafter animals fasted overnight were anaesthetized (sodium pentobarbitone, 60 mg/kg i.p.) and acute renal haemodynamic responses studied. 3. Dose-response curves were constructed for dopamine and isoprenaline that induced falls or increases in renal blood flow, respectively. It was observed that renal vascular responses were greater in the denervated as compared with rats with intact renal nerves (all P < 0.05). Dopamine-induced renal vasoconstrictor responses were markedly lower in losartan-treated denervated WKY and SHR compared with their untreated counterparts (all P < 0.05). It was also observed that in losartan-treated and denervated WKY rats the vasodilatory responses to isoprenaline were markedly lower compared with untreated rats (all P < 0.05). However, in SHR, under the same conditions, there was no difference in the renal response to isoprenaline whether or not rats were treated with losartan (P > 0.05). 4. The data obtained showed that the renal vasoconstrictor effect of dopamine depends on intact renal nerves and RAS in WKY and SHR. Isoprenaline responses were likewise sensitive to renal denervation and RAS inhibition in WKY rats but not SHRs. Our observations reveal a possible relationship between renal AT(1) receptors and alpha(1)-adrenoceptors in WKY and SHR. There is also evidence to suggest an interaction between renal beta-adrenoceptors and AT(1) receptors in WKY rats. SN - 1474-8673 UR - https://www.unboundmedicine.com/medline/citation/18778332/Inhibition_of_Ang_II_and_renal_sympathetic_nerve_influence_dopamine_and_isoprenaline_induced_renal_haemodynamic_changes_in_normal_Wistar_Kyoto_and_spontaneously_hypertensive_rats_ L2 - https://doi.org/10.1111/j.1474-8673.2008.00422.x DB - PRIME DP - Unbound Medicine ER -