Abstract
While systemic capsaicin in adult rats is known to reduce substance P and somatostatin in primary sensory nerves, it is still unknown if it also affects the production of these peptides at the genetic level. Therefore, we examined the effects of systemically administered capsaicin on the expression of the beta-preprotachykinin, gamma-preprotachykinin, somatostatin, calcitonin gene-related peptide, vasoactive intestinal polypeptide, galanin, neuropeptide Y and neurotrophin receptor family (trkA, trkB, trkC) genes in dorsal root ganglion neurons by in situ hybridization in adult rats. Nerve growth factor is thought to be involved in the regulation of some of these genes. In the control animals, beta-preprotachykinin, gamma-preprotachykinin, calcitonin gene-related peptide, somatostatin, trkA, trkB and trkC messenger RNAs were found in about 30%, 30%, 40%, 10%, 40%, 5% and 20% of the lumbar dorsal root ganglion neurons, respectively. The number of neurons expressing beta/gamma-preprotachykinin and calcitonin gene-related peptide messenger RNAs decreased to about 50% and 70% of the control values, respectively, six days after subcutaneous administration of capsaicin (950 mg/kg). Simultaneously, the number of trkA messenger RNA-expr...Continue Reading
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