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Type: Artigo de periódico
Title: Corticosteroids Reduce Glial Fibrillary Acidic Protein Expression In Response To Spinal Cord Injury In A Fetal Rat Model Of Dysraphism.
Author: Melo-Filho, Antônio Aldo
Weber Guimarães Barreto, Maria
Capelli Nassr, Azize Cristina
Rogério, Fábio
Langone, Francesco
Pereira, Luis Antonio Violin
Sbragia, Lourenço
Abstract: Exposure of the spinal cord in myelomeningocele (MM) throughout gestation increases spinal injury. Astrocyte activation evidenced by glial fibrillary acidic proteins (GFAP) indicates the extent of injury. Corticosteroids modulate GFAP synthesis, but their effect in MM is unclear. The purpose of this study was to evaluate the GFAP expression in a fetal rat model of dysraphism and the effect of corticosteroid treatment on this marker and on clinical neurological disabilities. Dysraphism was surgically created in 2 groups of 48 rat fetuses; group 1: control, and group 2: treated with corticosteroid. Each group was subdivided into fetuses with surgically created MM, controls and shams on day 18.5 of gestation (term = 22 days). Fetuses were harvested on day 21.5, examined for evidence of neurological deficits, and the following clinical parameters were registered: kyphosis, tail deformities, leg deformities, leg paralysis or paresis and pain perception. The fetuses were fixed for GFAP immunostaining. All fetuses with MM in group 1 presented neurological deficits and glial reactions with GFAP expression, as opposed to controls and shams. In group 2, corticosteroid treatment prevented some neurological deficits (18-25%), reducing glial response and GFAP expression. Experimentally induced dysraphism in the rat fetus is related to glial response and increased GFAP expression in the spinal cord. Corticoid treatment clinically improved nerve injury in some fetuses. It reduced glial reaction and GFAP expression.
Subject: Adrenal Cortex Hormones
Biological Markers
Disease Models, Animal
Glial Fibrillary Acidic Protein
Rats, Sprague-dawley
Spinal Cord
Spinal Cord Injuries
Spinal Dysraphism
Citation: Pediatric Neurosurgery. v. 45, n. 3, p. 198-204, 2009.
Rights: fechado
Identifier DOI: 10.1159/000222670
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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