Nitric oxide differentially regulates renal ATP-binding cassette transporters during endotoxemia.
until further notice
SourcePflügers Archiv : European Journal of Physiology, 454, 2, (2007), pp. 321-934
Article / Letter to editor
Display more detailsDisplay less details
Central Animal Laboratory
IMM - Institute for Molecules and Materials
Pflügers Archiv : European Journal of Physiology
SubjectIGMD 9: Renal disorder; NCMLS 5: Membrane transport and intracellular motility; Synthetic Organic Chemistry; UMCN 5.4: Renal disorders
Nitric oxide (NO) is an important regulator of renal transport processes. In the present study, we investigated the role of NO, produced by inducible NO synthase (iNOS), in the regulation of renal ATP-binding cassette (ABC) transporters in vivo during endotoxemia. Wistar-Hannover rats were injected with lipopolysaccharide (LPS(+)) alone or in combination with the iNOS inhibitor, aminoguanidine. Controls received detoxified LPS (LPS(-)). After LPS(+), proximal tubular damage and a reduction in renal function were observed. Furthermore, iNOS mRNA and protein, and the amount of NO metabolites in plasma and urine, increased compared to the LPS(-) group. Coadministration with aminoguanidine resulted in an attenuation of iNOS induction and reduction of renal damage. Gene expression of 20 ABC transporters was determined. After LPS(+), a clear up-regulation in Abca1, Abcb1/P-glycoprotein (P-gp), Abcb11/bile salt export pump (Bsep), and Abcc2/multidrug resistance protein (Mrp2) was found, whereas Abcc8 was down-regulated. Up-regulation of Abcc2/Mrp2 was accompanied by enhanced calcein excretion. Aminoguanidine attenuated the effects on transporter expression. Our data indicate that NO, produced locally by renal iNOS, regulates the expression of ABC transporters in vivo. Furthermore, we showed, for the first time, expression and subcellular localization of Abcb11/Bsep in rat kidney.
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.