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$B!J(B1$B!K!!(BPMA-induced re-sensitization of desensitized TRPV1 is mediated by PKC epsilon and phosphorylation at Ser 800.

Sravan Mandadi 1, 2, Tomoko Tominaga 1, 2, Mitsuko Numazaki 3,
Namie Murayama 1, 2, Basil D. Roufogalis 4, Makoto Tominaga 1, 2
(1 Section of Cell Signaling, Okazaki Institute for Integrative Bioscience,
2 Department of Physiological Sciences,The Graduate University for Advanced Studies,
3 Department of Anesthesiology, University of Tsukuba School of Medicine,
4 Faculty of Pharmacy, University of Sydney)

$B!!(BImportant mechanisms that regulate inhibitory and facilitatory effects on TRPV1- mediated pain are desensitization and phosphorylation, respectively. Using Ca2+-imaging, we have previously shown that desensitization of TRPV1 upon successive capsaicin applications was reversed by protein kinase C activation in dorsal root ganglion neurons and CHO cells. Here, using both Ca2+-imaging and patch-clamp methods, we show that PMA-induced activation of PKCe is essential for increased sensitivity of desensitized TRPV1. TRPV1 has two putative substrates S502 and S800 for PKCe-mediated phosphorylation. Patch clamp analysis of HEK293 cells expressing single mutants S502A or S800A and double mutant S502A/S800A show equal contribution of S502 or S800 towards increased sensitivity of desensitized TRPV1. Since S502 is a non-specific substrate for TRPV1 phosphorylation by other kinases PKA or CAMKII, a role of PKC specific substrate S800 is further investigated. Evidence for in vivo phosphorylation of TRPV1 at S800 is demonstrated for the first time. We also show that the expression level of PKCe parallels the amount of phosphorylated TRPV1 protein. These results, obtained using an antibody specific for TRPV1 phosphorylation at S800. Furthermore, the anti-phosphoTRPV1 antibody detects phosphorylation of TRPV1 in rat DRG neurons and may be useful for research regarding nociception in native tissues. This study identifies PKCe and S800 as important therapeutic targets that regulate sensitivity of TRPV1 and may be effectively used for better management of TRPV1-mediated pain states regulated by PKC.

 

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