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Non-Competitive but pH-Dependent Action of SB-366791 on Proton-Induced Activation of TRPV1 Receptors

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Biochemistry (Moscow), Supplement Series A: Membrane and Cell Biology Aims and scope

Abstract

The transient receptor potential vanilloid type 1 (TRPV1) is a nonselective cation channel gated by numerous chemical and physical stimuli (protons, capsaicin, heat, etc). TRPV1 receptors are important integrators of multiple noxious and inflammatory signals in vertebrates. Modulation of TRPV1 receptors activity is considered to be a promising strategy for pain treatment. SB-366791 is a TRPV1 antagonist that demonstrates good analgesic effects in various models of pain. Molecular mechanisms of the SB-366791 action on TRPV1 are not clear. It antagonizes capsaicin activation in a competitive manner, but the data on its action in the case of activation by protons are controversial. Here we studied effects of SB-366791 when TRPV1 receptors are activated by acidification. We carried out patch-clamp experiments (voltage-clamp mode) on cultured CHO cells stably expressing rat TRPV1 receptors. The whole-cell proton-evoked currents were reduced in the presence of SB-366791. Concentration dependencies of the inhibitory effect of SB-366791 were studied at different pH values. Stronger acidification reduced the maximum effect of SB-366791, while the IC50 values were virtually unaffected. Thus, SB-366791 acts in a non-competitive but pH-dependent way. Probably, there is an allosteric interplay between proton- and capsaicin-binding sites.

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Authors and Affiliations

  1. Sechenov Institute of Evolutinary Physiology and Biochemistry, Russian Academy of Sciences, St.-Petersburg, 194223, Russia

    M. S. Komarova, N. N. Potapieva & M. V. Nikolaev

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  1. M. S. Komarova
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  2. N. N. Potapieva
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  3. M. V. Nikolaev
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Correspondence to M. V. Nikolaev.

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Original Russian Text © M.S. Komarova, N.N. Potapieva, M.V. Nikolaev, 2018, published in Biologicheskie Membrany, 2018, Vol. 35, No. 3, pp. 192–199.

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Komarova, M.S., Potapieva, N.N. & Nikolaev, M.V. Non-Competitive but pH-Dependent Action of SB-366791 on Proton-Induced Activation of TRPV1 Receptors. Biochem. Moscow Suppl. Ser. A 12, 107–113 (2018). https://doi.org/10.1134/S1990747818020083

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  • DOI: https://doi.org/10.1134/S1990747818020083

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