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TRPV3 endogenously expressed in murine colonic epithelial cells is inhibited by the novel TRPV3 blocker 26E01. | LitMetric

TRPV3 endogenously expressed in murine colonic epithelial cells is inhibited by the novel TRPV3 blocker 26E01.

Cell Calcium

Rudolf-Boehm-Institut für Pharmakologie und Toxikologie, Universität Leipzig, Leipzig, Germany. Electronic address:

Published: December 2020

AI Article Synopsis

Article Abstract

TRPV3 is a Ca-permeable cation channel, prominently expressed by keratinocytes where it contributes to maintaining the skin barrier, skin regeneration, and keratinocyte differentiation. However, much less is known about its physiological function in other tissues and there is still a need for identifying novel and efficient TRPV3 channel blockers. By screening a compound library, we identified 26E01 as a novel TRPV3 blocker. 26E01 blocks heterologously expressed TRPV3 channels overexpressed in HEK293 cells as assessed by fluorometric intracellular free Ca assays (IC = 8.6 μM) but does not affect TRPV1, TRPV2 or TRPV4 channels. Electrophysiological whole-cell recordings confirmed the reversible block of TRPV3 currents by 26E01, which was also effective in excised inside-out patches, hinting to a rather direct mode of action. 26E01 suppresses endogenous TRPV3 currents in the mouse 308 keratinocyte cell line and in the human DLD-1 colon carcinoma cell line (IC = 12 μM). In sections of the gastrointestinal epithelium of mice, the expression of TRPV3 mRNA follows a gradient along the gastrointestinal tract, with the highest expression in the distal colon. 26E01 efficiently attenuates 2-aminoethoxydiphenyl borate-induced calcium influx in primary colonic epithelial cells isolated from the distal colon. As 26E01 neither shows toxic effects on DLD-1 cells at concentrations of up to 100 μM in MTT assays nor on mouse primary colonic crypts as assessed by calcein-AM/propidium iodide co-staining, it may serve as a useful tool to further study the physiological function of TRPV3 in various tissues.

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http://dx.doi.org/10.1016/j.ceca.2020.102310DOI Listing

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