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Electroneutral transport of organic cations in canine renal brush border membrane vesicles (BBMV)

PP Sokol, PD Holohan and CR Ross

The effect of potential difference on the organic cation/H+ antiport system located in brush border membrane vesicles was examined. Potential difference was generated using K+ gradients and a K+-specific ionophore, valinomycin. Transport of a prototypic organic cation, 1N- [3H]methylnicotinamide (NMN), was assessed under conditions where K+ diffusion potentials generated transient intravesicular negative and positive states. The results demonstrate that NMN transport is independent of potential difference. The organic cation/H+ coupling ratio was studied by imposing transmembrane H+ and NMN gradients of varying magnitudes and measuring net flux of NMN for a 5-sec period. Consistent with an equilibrium thermodynamics model, no net NMN flux is observed when the NMN gradient from out to in is equal to the H+ gradient from out to in ([NMN]o/[NMN]i equals [H+]o/[H+]i). This suggests that the carrier is at equilibrium and that the stoichiometry for the organic cation/H+ antiport is 1:1.

Volume 233, Issue 3, pp. 694-699, 06/01/1985
Copyright © 1985 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1985 by the American Society for Pharmacology and Experimental Therapeutics.