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Walkowska, Agnieszka ; Badzyńska, Bożena ; Kompanowska-Jezierska, Elżbieta ; Johns, EJ ; Sadowski, Janusz
Laboratory of Renal and Body Fluid Physiology, M. Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw,Poland ; Department of Physiology, University College Cork, Cork, Ireland
AIM:We studied a possible action of nitric oxide (NO), an intrarenal vasodilator, to buffer a decrease in renal perfusion induced by electrical stimulation of renal nerves (RNS).METHODS:In anaesthetized rats RNS was performed (15 V, 2 ms pulse duration) for 10 s at the frequencies of 2, 3.5, 5 and 7.5 Hz. The total renal blood flow (RBF), an index of cortical perfusion, was measured using a Transonic probe on the renal artery. The outer and inner medullary blood flow (OMBF, IMBF) was measured by laser-Doppler flowmetry. The effect of RNS on RBF, OMBF and IMBF was determined in rats which were either untreated or pre-treated with L-NAME (0.6 or 1.8 mg kg(-1) i.v.), or S-methyl thiocitrulline (SMTC, 20 microg kg(-1) min(-1) i.v.), a selective inhibitor of neuronal NO synthase (nNOS).RESULTS:In untreated rats, RNS decreased IMBF significantly less than RBF and OMBF. High-dose L-NAME treatment significantly enhanced the RNS induced decrease of RBF but not of OMBF or IMBF. SMTC treatment significantly enhanced the decrease of IMBF, without affecting the response of RBF or OMBF.CONCLUSION:At intact NO synthesis the inner medullary circulation is not controlled by renal nerves to the extent observed for the outer medulla or cortex. NO generated by all NOS isoforms present in the kidney buffers partly the intrarenal vasoconstriction triggered by electrical RNS. The NO derived from nNOS seems of particular importance in the control of inner medullary perfusion, interacting with NO generated by endothelial NOS and renal nerves.
Acta Physiologica Scandinavica
Prawa zastrzeżone - dostęp nieograniczony
Instytut Medycyny Doświadczalnej i Klinicznej im. M. Mossakowskiego Polskiej Akademii Nauk
Biblioteka Instytutu Medycyny Doświadczalnej i Klinicznej im. M. Mossakowskiego PAN
Program Operacyjny Innowacyjna Gospodarka, lata 2010-2014, Priorytet 2. Infrastruktura strefy B + R
25 mar 2022
15 cze 2015
61
https://rcin.org.pl./publication/74615
Kompanowska-Jezierska, Elżbieta Kuczeriszka, Marta
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Walkowska, Agnieszka Kuczeriszka, Marta Sadowski, Janusz Olszyński, Krzysztof Hubert Dobrowolski, Leszek Cervenka, Ludek Hammock, BD Kompanowska-Jezierska, Elżbieta
Certikova-Chabova, Vera Vernerova, Zdenka Kujal, Peter Huskova, Zdenka Skaroupkova, Petra Tesal, Vladimir Kramer, Hubert J. Kompanowska-Jezierska, Elżbieta Walkowska, Agnieszka Sadowski, Janusz Cervenka, Ludek Vaneckova, Ivana
Kompanowska-Jezierska, Elżbieta
Kompanowska-Jezierska, Elżbieta
Bądzyńska, Bożena
Walkowska, Agnieszka