Abstract
Transient receptor potential (TRP) channels of the TRPV, TRPA, and TRPM subfamilies play important roles in somatosensation including nociception. While particularly the Thermo TRPs have been extensively investigated in sensory neurons, the relevance of the subclass of “canonical” TRPC channels in primary afferents is yet elusive. In the present study, we investigated the presence and contribution to Ca2+ transients of TRPC channels in dorsal root ganglion neurons. We found that six of the seven known TRPC subtypes were expressed in lumbar DRG, with TRPC1, C3, and C6 being the most abundant. Microfluorimetric calcium measurements showed Ca2+ influx induced by oleylacylglycerol (OAG), an activator of the TRPC3/C6/C7 subgroup. Furthermore, OAG induced rises in [Ca2+]i were inhibited by SKF96365, an inhibitor of receptor and store operated calcium channel. OAG induced calcium transients were also inhibited by blockers of diacylglycerol (DAG) lipase, lipoxygenase or cyclooxygenase and, intriguingly, by inhibitors of the capsaicin receptor TRPV1. Notably, SKF96365 did not affect capsaicin-induced calcium transients. Taken together, our findings suggest that TRPC are functionally expressed in subpopulations of DRG neurons. These channels, along with TRPV1, contribute to calcium homeostasis in rat sensory neurons.
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Kress, M., Karasek, J., Ferrer-Montiel, A.V. et al. TRPC channels and diacylglycerol dependent calcium signaling in rat sensory neurons. Histochem Cell Biol 130, 655–667 (2008). https://doi.org/10.1007/s00418-008-0477-9
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DOI: https://doi.org/10.1007/s00418-008-0477-9