TRPV1 and diabetes mellitus: The findings of current study may demonstrate the neuroprotective effects of CGRP in the normalization of the proportion of TRPV1/CGRP expressing neurons and also the probability of correction of the impaired viability of the DRG neurons, the outgrowth of the neurites and the axonal transport function in the development of diabetes via normalization of the metabolism of ROS and the mitochondrial transmembrane potential.