Cortex glial cells activation, associated with lowered mechanical thresholds and motor dysfunction, persists into adulthood after neonatal pain

Autor(es)

Sanada, Luciana Sayuri ^{[1, 2]} ; Sato, Karina Laurenti ^[1] ; Machado, Nathalia Leilane Berto ^[2] ; do Carmo, Elisabete de Cassia ^[2] ; Sluka, Kathleen A. ^[1] ; Sassoli Fazan, Valeria Paula ^[2]

Afiliação do(s) autor(es)

^[1] Univ Iowa, Carver Coll Med, Dept Phys Therapy & Rehabil Sci, Iowa City, IA - USA

^[2] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Neurosci & Behav Sci, Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF DEVELOPMENTAL NEUROSCIENCE; v. 35, p. 55-63, JUN 2014.
• Citações Web of Science: 5

Resumo

We investigated if changes in glial activity in cortical areas that process nociceptive stimuli persisted in adult rats after neonatal injury. Neonatal pain was induced by repetitive needle prickling on the right paw, twice per day for 15 days starting at birth. Wistar rats received either neonatal pain or tactile stimulation and were tested behaviorally for mechanical withdrawal thresholds of the paws and gait alterations, after 15 (P15) or 180 (P180) days of life. Brains from rats on P15 and P180 were immunostained for glial markers (GFAP, MCP-1, OX-42) and the following cortical areas were analyzed for immunoreactivity density: prefrontal, anterior insular, anterior cingulated, somatosensory and motor cortices. Withdrawal thresholds of the stimulated paw remained decreased on P180 after neonatal pain when compared to controls. Neonatal pain animals showed increased density for both GFAP and MCP-1 staining, but not for OX-42, in all investigated cortical areas on both experimental times (P15 and P180). Painful stimuli in the neonatal period produced pain behaviors immediately after injury that persisted in adult life, and was accompanied by increase in the glial markers density in cortical areas that process and interpret pain. Thus, long-lasting changes in cortical glial activity could be, at least in part, responsible for the persistent hyperalgesia in adult rats that suffered from neonatal pain. (C) 2014 ISDN. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/02710-2 - Imunoreatividade das células glias em encéfalos de ratos recém-nascidos e adultos, após estimulação dolorosa no período neonatal
• Beneficiário: Luciana Sayuri Sanada
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 09/07265-4 - Avaliação do desenvolvimento das fibras mielínicas e amielínicas dos nervos sural e tibial pós estímulos nociceptivos na fase neonatal
• Beneficiário: Luciana Sayuri Sanada
• Modalidade de apoio: Bolsas no Brasil - Doutorado