Activation of TRPM8 channel inhibits contraction of the isolated human ureter.

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Liu J, Liu L, Zhao M, Ding N, Ge N, Daugherty SL, Beckel JM, Wang S, Zhang X

Activation of TRPM8 channel inhibits contraction of the isolated human ureter.

Neurourol Urodyn. 2021 Aug;40(6):1450-1459. doi: 10.1002/nau.24689. Epub 2021 May 20.

PubMed ID

34015169 [ View in PubMed

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Abstract

AIMS: The transient receptor potential melastin-8 (TRPM8) channel is a "cooling" receptor expressed in primary sensory neurons and can be activated by compounds like menthol or icilin. TRPM8 is involved in the regulation of urinary bladder sensory function and contraction, but the role of TRPM8 in the ureter, particularly in the human ureter, is poorly understood. The aim of this study is to examine the effects of TRPM8 activation on human ureter contraction. METHODS: Human ureters were acquired from 20 patients undergoing radical nephrectomy. Contractions of ureter strips were recorded by an isometric transducer in the organ bath. Ureteral TRPM8 expression in the human ureter was examined by immunofluorescence and western blot. RESULTS: The two TRPM8 agonists menthol and icilin both reduced the frequency of spontaneous, electrical field stimulation, or neurokinin A-evoked ureteral contractions in a dose-dependent manner. The inhibitory effects were decreased by 10-fold in mucosa-denuded strips. The inhibitory effects of TRPM8 agonists were mimicked by calcitonin gene-related peptide (CGRP), and were blocked by KRP2579 (a TRPM8 antagonist), tetrodotoxin (a sodium channel blocker), olcegepant (BIBN, a CGRP receptor antagonist), SQ22536 (an adenylate cyclase antagonist), or H89 (a nonspecific cAMP-dependent protein kinase A inhibitor). TRPM8 was coexpressed with CGRP on the nerves located in the suburothelial and intermuscular regions and was not expressed in the urothelium. CONCLUSIONS: The TRPM8 channel expressed on sensory nerve terminals of the human ureter is involved in the inhibitory sensory neurotransmission and modulate ureter contraction via the CGRP-adenylyl cyclase-protein kinase A pathway. TRPM8 may be involved in stone-induced changes in ureter contraction or pain.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Menthol	Transient receptor potential cation channel subfamily M member 8	Protein	Humans	Unknown	Agonist	Details
Olcegepant	Calcitonin gene-related peptide type 1 receptor	Protein	Humans	Unknown	Antagonist	Details