Endothelin-1 potentiates TRPV1-mediated vasoconstriction of human adipose arterioles in a protein kinase C-dependent manner. Br J Pharmacol 2021 Feb;178(3):709-725
Date
11/14/2020Pubmed ID
33184836Pubmed Central ID
PMC9121782DOI
10.1111/bph.15324Scopus ID
2-s2.0-85098221966 (requires institutional sign-in at Scopus site) 5 CitationsAbstract
BACKGROUND AND PURPOSE: The TRPV cation channels have emerged as important regulators of vascular tone. TRPV1 channels and endothelin-1 are independently associated with the pathophysiology of coronary vasospasm, but the relationship between their vasomotor functions remains unclear. We characterized the vasomotor function of TRPV1 channels in human arterioles and investigated regulation of their vasomotor function by endothelin-1.
EXPERIMENTAL APPROACH: Human arterioles (mainly from adipose tissue) were threaded on two metal wires, equilibrated in a physiological buffer at 37°C and exposed to increasing concentrations of capsaicin, with or without SB366791 (TRPV1-selective inhibitor) or GF109203X (PKC-selective inhibitor). Some arterioles were pre-constricted with endothelin-1 or phenylephrine or high potassium buffer. TRPV1 mRNA and protein expression in human arteries were also assessed.
KEY RESULTS: TRPV1 transcripts and proteins were detected in human resistance arteries. Capsaicin (1 μM) induced concentration-dependent constriction of endothelium-intact and endothelium-denuded human adipose arterioles (HAA), which was significantly inhibited by SB366791. Pre-constriction of HAA with endothelin-1, but not high potassium buffer or phenylephrine, significantly potentiated capsaicin (0.1 μM)-induced constriction. GF109203X significantly inhibited potentiation of capsaicin-induced constriction by endothelin-1.
CONCLUSION AND IMPLICATIONS: TRPV1 channels are expressed in the human vasculature and affect vascular tone of human arterioles on activation. Their vasomotor function is modulated by endothelin-1, mediated in part by PKC. These findings reveal a novel interplay between endothelin-1 signalling and TRPV1 channels in human VSMC, adding to our understanding of the ion channel mechanisms that regulate human arteriolar tone and may also contribute to the pathophysiology of coronary vasospasm.
Author List
Korishettar AM, Nishijima Y, Wang Z, Xie Y, Fang J, Wilcox DA, Zhang DXAuthors
David A. Wilcox PhD Professor in the Pediatrics department at Medical College of WisconsinDavid X. Zhang MD, PhD Associate Professor in the Medicine department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
Adipose TissueArterioles
Capsaicin
Endothelin-1
Humans
Protein Kinase C
TRPV Cation Channels
Vasoconstriction
