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TRPV1 antagonist BCTC inhibits pH 6.0-induced pain in human skin.

Abstract：

:Tissue acidosis due to ischemia occurs under several pathological conditions and is believed to contribute to pain in these circumstances. TRPV1, TRPA1, and ASICs are known to be sensitive to acidic pH. Addressing their possible role in acidosis perception, the respective antagonists BCTC, A-967079, and amiloride were injected in the volar forearm skin of 32 healthy volunteers. To investigate possible redundancies between channels, a full-factorial study design was used. Injections were performed in a prerandomized, double-blind, and balanced design. Each injection included a three-step pH protocol from pH 7.0 over pH 6.5 to pH 6.0 with a step duration of 90 seconds. Pain was reported by volunteers on a numerical scale every 10 seconds during injections. Confirming the primary hypothesis, the combination of all 3 antagonists reduced acid-induced pain at pH 6.0. Because of the full-factorial design, it could be concluded that BCTC alone, but not A-967079 or amiloride, or any combination thereof, was responsible for the observed effects, suggesting TRPV1 as primary sensor for pH 6.0-induced pain. Surprisingly, A-967079 even enhanced pain induced by pH 6.0. In cultured mouse dorsal root ganglion neurons, TPRV1 dependence of pH 6-induced calcium responses could be confirmed. Responses of hTRPV1 to acidic stimulation showed a maximum around pH6, providing an explanation for the pH-dependent inhibition by BCTC. A-967079 sensitizes pH responses is a TRPA1-responsive dorsal root ganglion neuron population, and a direct effect of A-967079 on hTRPA1 and hTRPV1 was excluded. In conclusion, inhibiting TRPV1-mediated acidosis-induced pain could be a symptomatic and potentially also a disease-modifying approach.

journal_name

Pain

journal_title

Pain

authors

Heber S,Ciotu CI,Hartner G,Gold-Binder M,Ninidze N,Gleiss A,Kress HG,Fischer MJM

doi

10.1097/j.pain.0000000000001848

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

1532-1541

issue

7

eissn

0304-3959

issn

1872-6623

pii

00006396-202007000-00011

journal_volume

161

pub_type

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