Role of Transient Receptor Potential Channels Trpv1 and Trpm8 in Diabetic Peripheral Neuropathy
Overview
Affiliations
Objective: 1.1.Transient Receptor Potential (Vanilloid 1) TRPV1 and (Melastatin 8) TRPM8 are heat and cold sensing non-selective cation channels, respectively. We sought to correlate the modulation of TRPV1- and TRPM8-mediated membrane currents and altered thermal sensitivity in Diabetic Peripheral Neuropathy (DPN).
Method: 1.2.Streptozotocin (STZ)-induced diabetic mice were used and thermal (heat and cold) pain sensitivities were determined using hot plate and acetone drop test, respectively. Membrane currents were recorded using patch-clamp techniques.
Results: 1.3.First, we tested thermal pain sensitivities to implicate a possible role of TRPV1 and TRPM8 in DPN. Paw withdrawal latency on a hot plate test was decreased, and acetone-induced cold sensitivity was enhanced in diabetic mice as compared to non-diabetic mice. Dorsal Root Ganglion (DRG) neurons dissociated from diabetic hyperalgesic mice exhibited an increase in TRPV1-mediated current and a decrease in TRPM8-mediated currents as compared to non-diabetic mice. Then, we determined the modulation of TRPV1- and TRPM8-mediated currents using HEK cells heterologously expressing TRPV1 by promoting PKC- and PKA-mediated phosphorylation. Both Phorbol 12,13-Dibutyrate (PDBu), a PKC activator and forskolin, a PKA activator upregulated TRPV1-mediated currents but downregulated TRPM8-mediated currents. In diabetic mice, intraplantar injection of capsaicin, a TRPV1 agonist-induced nocifensive behavior but the severity of this behavior was significantly lower when co-administered with menthol, a TRPM8 agonist.
Conclusions: 1.4.These findings suggest that diabetic thermal hyperalgesia mediated by up-regulation of TRPV1 function may be further aggravated by the downregulation of TRPM8 function. Targeting TRPV1 may be a useful approach to alleviate pain associated with DPN.
Li W, Zhao Y, Liu H, Liu J, Chan S, Zhong Y Int J Mol Sci. 2024; 25(11).
PMID: 38892000 PMC: 11171746. DOI: 10.3390/ijms25115813.
Fajrin F, Holidah D, Nurhidayah H, Suci Wulansari P, Pudji Restanto D, Azkiyah L Saudi Pharm J. 2024; 32(6):102097.
PMID: 38746850 PMC: 11091690. DOI: 10.1016/j.jsps.2024.102097.
The role of protein kinases in diabetic neuropathic pain: an update review.
Taher M, Mohammed M, Al-Mahdawi M, Halaf N, Turki Jalil A, Alsandook T J Diabetes Metab Disord. 2023; 22(1):147-154.
PMID: 37255803 PMC: 10225446. DOI: 10.1007/s40200-023-01217-1.
Mechanistic investigations of diabetic ocular surface diseases.
Zhou Q, Yang L, Wang Q, Li Y, Wei C, Xie L Front Endocrinol (Lausanne). 2023; 13:1079541.
PMID: 36589805 PMC: 9800783. DOI: 10.3389/fendo.2022.1079541.
The distinctive role of menthol in pain and analgesia: Mechanisms, practices, and advances.
Li Z, Zhang H, Wang Y, Li Y, Li Q, Zhang L Front Mol Neurosci. 2022; 15:1006908.
PMID: 36277488 PMC: 9580369. DOI: 10.3389/fnmol.2022.1006908.