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Structure and interaction of inhibitors with the TEA/H+ exchanger of rabbit renal brush border membranes

  • Original Article
  • Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands
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Abstract

The renal secretion of organic cations (OCs) involves a carrier-mediated exchange of OC for H+ in the luminal membrane of proximal cells. To assess the influence of chemical structure on the interaction of potential substrates with this process we examined the effect of a series of quaternary ammonium compounds on the transport of the OC tetraethylammonium (TEA) in a preparation of isolated renal brush-border membrane vesicles. Apparent inhibitory potency varied over a factor of 104, as expressed in inhibitor coefficients (K i TEA) whose approximate values ranged from 0.5 μM to 5 mM. The poorest inhibitors of TEA/H+ exchange were those molecules with carboxyl or hydroxyl residues, whereas the addition of methylene groups to a parent molecule tended to increase inhibitory potency. A plot of apparent K i TEA versus calculated octanol:water partition coefficient (expressed in terms of a relative lipophilicity factor) showed a clear correlation between these two parameters, although there was considerable variability between apparent lipophilicity and K i TEA for molecules with very different parent structures. For select groups of molecules with similar parent structures (e.g., the n-tetraalkylammoniums or the 4-phenylpyridinium, 3-phenylpyridinium, and quinolinium compounds) the correlation between calculated lipophilicity and apparent K i TEA was more marked. However, even within these groups of closely related parent structures, there appeared to be subtle, but systematic, variations in inhibitory potency that may have been related to the influence of steric factors on the binding of inhibitors to the TEA/H+ exchanger. We conclude that the lipophilic nature of a quaternary ammonium compound represents the predominant factor in the binding to, and subsequent inhibition of, luminal TEA/H+ exchange. Specific steric factors may influence the binding of substrate to the exchanger, but play a secondary role in this interaction.

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  1. Department of Physiology, College of Medicine, University of Arizona, 85724, Tucson, AZ, USA

    Stephen H. Wright, Theresa M. Wunz & Timothy P. Wunz

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Wright, S.H., Wunz, T.M. & Wunz, T.P. Structure and interaction of inhibitors with the TEA/H+ exchanger of rabbit renal brush border membranes. Pflugers Arch. 429, 313–324 (1995). https://doi.org/10.1007/BF00374145

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  • DOI: https://doi.org/10.1007/BF00374145

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