These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Relation of cysteine conjugate nephrotoxicity to transport by the basolateral organic anion transport system in isolated S2 segments of rabbit proximal renal tubules.
    Author: Dantzler WH, Evans KK, Groves CE, Welborn JR, North J, Stevens JL, Wright SH.
    Journal: J Pharmacol Exp Ther; 1998 Jul; 286(1):52-60. PubMed ID: 9655841.
    Abstract:
    We examined basolateral transport of the radiolabeled zwitterionic nephrotoxic cysteine S-conjugate, S-(1,2-dichlorovinyl)-L-cysteine (DCVC), inhibition of such transport and the effects of inhibition of transport on the toxicity produced by DCVC in isolated S2 segments of rabbit proximal tubules. High concentrations of unlabeled DCVC itself and an unlabeled nontoxic cysteine S-conjugate, S-(2-benzothiazole)-L-cysteine cis-inhibited the basolateral uptake of radiolabeled DCVC by approximately 80 to 85%. High concentrations of para-aminohippurate, the prototype substrate for the basolateral organic anion transport system, and probenecid, a well-known inhibitor of basolateral organic anion transport, cis-inhibited the basolateral uptake of radiolabeled DCVC by approximately 70%, whereas a high concentration of L-phenylalanine had little effect. High concentrations of S-(2-benzothiazole)-L-cysteine and para-aminohippurate in the bathing medium with DCVC inhibited the loss of 86Rb (used as a K+ surrogate to measure toxicity) from S2 segments produced by DCVC alone to approximately the same extent as they inhibited uptake of DCVC. Under the same circumstances, probenecid completely inhibited 86Rb loss. These data indicate that in rabbit proximal renal S2 tubules basolateral entry of DCVC can occur to a major extent via the organic anion transport pathway and that inhibition of such entry can reduce toxicity to approximately the same extent that entry is reduced. They also suggest that probenecid provides additional protection from DCVC toxicity.
    [Abstract] [Full Text] [Related] [New Search]