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Prostaglandins but not nitric oxide protect renal medullary perfusion in anaesthetised rats receiving angiotensin II.
J Physiol. 2003 May 01; 548(Pt 3):875-80.JP

Abstract

Angiotensin II (Ang II) fails to constrict renal medullary vasculature, possibly due to the counteraction of local vasodilators, such as prostaglandins or nitric oxide (NO). The effects of exogenous Ang II on intrarenal circulation were determined in anaesthetised rats that were untreated or pretreated with indomethacin (Indo) or L-NAME. The total renal blood flow (RBF), representing cortical perfusion, and outer and inner medullary blood flow (OMBF and IMBF) were measured. In untreated rats, Ang II decreased RBF in a dose dependent manner. Intravenous administration of 30 ng kg-1 min-1 Ang II decreased RBF by 38 % and OMBF by 9 % (both significant); IMBF was unaffected. Indo (5 mg kg-1 I.V.) significantly and similarly decreased OMBF and IMBF without affecting RBF. Ang II decreased IMBF by 27 % in Indo-pretreated rats, but caused no change in rats without pretreatment. The decreases in OMBF and RBF were comparable with or without Indo pretreatment. Inhibition of NO synthesis with L-NAME (0.6 mg kg-1 I.V.) significantly decreased RBF, OMBF and IMBF. Ang II infusion into L-NAME-pretreated rats induced a further significant decrease in RBF and OMBF without changing IMBF. We conclude that within the inner medulla, but not the outer medulla or cortex, prostaglandins effectively counteract the vasopressor effect of circulating Ang II.

Authors+Show Affiliations

Laboratory of Renal and Body Fluid Physiology, M. Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12640010

Citation

Badzyńska, Bozena, et al. "Prostaglandins but Not Nitric Oxide Protect Renal Medullary Perfusion in Anaesthetised Rats Receiving Angiotensin II." The Journal of Physiology, vol. 548, no. Pt 3, 2003, pp. 875-80.
Badzyńska B, Grzelec-Mojzesowicz M, Sadowski J. Prostaglandins but not nitric oxide protect renal medullary perfusion in anaesthetised rats receiving angiotensin II. J Physiol. 2003;548(Pt 3):875-80.
Badzyńska, B., Grzelec-Mojzesowicz, M., & Sadowski, J. (2003). Prostaglandins but not nitric oxide protect renal medullary perfusion in anaesthetised rats receiving angiotensin II. The Journal of Physiology, 548(Pt 3), 875-80.
Badzyńska B, Grzelec-Mojzesowicz M, Sadowski J. Prostaglandins but Not Nitric Oxide Protect Renal Medullary Perfusion in Anaesthetised Rats Receiving Angiotensin II. J Physiol. 2003 May 1;548(Pt 3):875-80. PubMed PMID: 12640010.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prostaglandins but not nitric oxide protect renal medullary perfusion in anaesthetised rats receiving angiotensin II. AU - Badzyńska,Bozena, AU - Grzelec-Mojzesowicz,Monika, AU - Sadowski,Janusz, Y1 - 2003/03/14/ PY - 2003/3/18/pubmed PY - 2004/8/20/medline PY - 2003/3/18/entrez SP - 875 EP - 80 JF - The Journal of physiology JO - J Physiol VL - 548 IS - Pt 3 N2 - Angiotensin II (Ang II) fails to constrict renal medullary vasculature, possibly due to the counteraction of local vasodilators, such as prostaglandins or nitric oxide (NO). The effects of exogenous Ang II on intrarenal circulation were determined in anaesthetised rats that were untreated or pretreated with indomethacin (Indo) or L-NAME. The total renal blood flow (RBF), representing cortical perfusion, and outer and inner medullary blood flow (OMBF and IMBF) were measured. In untreated rats, Ang II decreased RBF in a dose dependent manner. Intravenous administration of 30 ng kg-1 min-1 Ang II decreased RBF by 38 % and OMBF by 9 % (both significant); IMBF was unaffected. Indo (5 mg kg-1 I.V.) significantly and similarly decreased OMBF and IMBF without affecting RBF. Ang II decreased IMBF by 27 % in Indo-pretreated rats, but caused no change in rats without pretreatment. The decreases in OMBF and RBF were comparable with or without Indo pretreatment. Inhibition of NO synthesis with L-NAME (0.6 mg kg-1 I.V.) significantly decreased RBF, OMBF and IMBF. Ang II infusion into L-NAME-pretreated rats induced a further significant decrease in RBF and OMBF without changing IMBF. We conclude that within the inner medulla, but not the outer medulla or cortex, prostaglandins effectively counteract the vasopressor effect of circulating Ang II. SN - 0022-3751 UR - https://www.unboundmedicine.com/medline/citation/12640010/Prostaglandins_but_not_nitric_oxide_protect_renal_medullary_perfusion_in_anaesthetised_rats_receiving_angiotensin_II_ L2 - https://doi.org/10.1113/jphysiol.2002.038075 DB - PRIME DP - Unbound Medicine ER -