Capsaicin-sensitive fibers mediate periorbital allodynia and activation of inflammatory cells after traumatic brain injury in rats: Involvement of TRPV1 channels in post-traumatic headache.
Post-traumatic headache (PTH) is a condition that frequently affects individuals after traumatic brain injury (TBI). Inflammation is one of the major causes of this disability. However, little is known about the trigger for, and endurance of, this painful process. Thus, the involvement of fibers containing the transient receptor potential vanilloid 1 (TRPV1) channels on the PTH and inflammation after TBI through neonatal treatment with capsaicin are investigated. Fluid percussion injury (FPI) in adult male Wistar rats caused periorbital allodynia in one, three and seven days after injury, and the neonatal treatment reversed the painful sensation in seven days. The lack of TRPV1 channels reduced the activation of macrophages and glial cells induced by TBI in the trigeminal system, which were characterized by glial fibrillary acidic protein (GFAP) and ionized calcium binding adapter molecule-1 (IBA-1) immune content in the ipsilateral trigeminal ganglion, brainstem, and perilesional cortex. Immunofluorescence analyses of the ipsilateral Sp5C nucleus demonstrated a hypertrophic astrocytes profile after TBI which was reduced with treatment. Moreover, effects of succinate sumatriptan (SUMA - 1 mg/kg), TRPV1 selective antagonist capsazepine (CPZ - 2 mg/kg), and TRP non-selective antagonist ruthenium red (RR - 3 mg/kg) were evaluated. Although all mentioned drugs reduced the painful sensation, SUMA and CPZ demonstrated a stronger effect compared to the RR treatment, reinforcing the involvement of TRPV1 channels in periorbital allodynia after TBI. Hence, this report suggests that TRPV1-containing fibers and TRPV1 channels are able to induce inflammation of the trigeminal system and maintain the painful sensation after TBI.
['da Silva Fiorin|Fernando|F|', 'do Espírito Santo|Caroline Cunha|CC|', 'do Nascimento|Raphael Santos|RS|', 'Cassol|Gustavo|G|', 'Plácido|Evelini|E|', 'Santos|Adair Roberto Soares|ARS|', 'Marques|Jefferson Luiz Brum|JLB|', 'Brocardo|Patricia S|PS|', 'Fighera|Michele Rechia|MR|', 'Royes|Luiz Fernando Freire|LFF|']
D000818:Animals D000831:Animals, Newborn D002211:Capsaicin D006261:Headache D018836:Inflammation Mediators D008297:Male D009412:Nerve Fibers D051298:Post-Traumatic Headache D051381:Rats D017208:Rats, Wistar D018689:Sensory System Agents D018170:Sumatriptan D050916:TRPV Cation Channels
TRPV1 channel Headache Inflammation Pain Fluid percussion injury Glial cells