Granulocyte-macrophage colony-stimulating factor improves mouse peripheral nerve regeneration following sciatic nerve crush

Autor(es)

Bombeiro, Andre Luis ^[1] ; Nunes Pereira, Bruna Toledo ^[1] ; Rodrigues de Oliveira, Alexandre Leite ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Inst Biol, Dept Struct & Funct Biol, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Neuroscience; v. 48, n. 5, p. 2152-2164, SEP 2018.
• Citações Web of Science: 1

Resumo

Peripheral nerve injuries severely impair patients' quality of life as full recovery is seldom achieved. Upon axonal disruption, the distal nerve stump undergoes fragmentation, and myelin breaks down; the subsequent regeneration progression is dependent on cell debris removal. In addition to tissue clearance, macrophages release angiogenic and neurotrophic factors that contribute to axon growth. Based on the importance of macrophages for nerve regeneration, especially during the initial response to injury, we treated mice with granulocyte-macrophage colony-stimulating factor (GM-CSF) at various intervals after sciatic nerve crushing. Sciatic nerves were histologically analyzed at different time intervals after injury for the presence of macrophages and indicators of regeneration. Functional recovery was followed by an automated walking track test. We found that GM-CSF potentiated early axon growth, as indicated by the enhanced expression of growth-associated protein at 7days postinjury. Inducible nitric oxide synthase expression increased at the beginning and at the end of the regenerative process, suggesting that nitric oxide is involved in axon growth and pruning. As expected, GM-CSF treatment stimulated macrophage infiltration, which increased at 7 and 14days; however, it did not improve myelin clearance. Instead, GM-CSF stimulated early brain-derived neurotrophic factor (BDNF) production, which peaked at 7days. Locomotor recovery pattern was not improved by GM-CSF treatment. The present results suggest that GM-CSF may have beneficial effects on early axonal regeneration. (AU)

• Processo FAPESP: 14/06892-3 - Utilização de células tronco mesenquimais na interface do sistema nervoso central e periférico: reparo de lesões proximais
• Beneficiário: Alexandre Leite Rodrigues de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/03094-4 - Potencial regenerativo axonal do GM-CSF no sistema nervoso periférico de camundongos C57BL/6
• Beneficiário: Bruna Toledo Nunes Pereira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica