Differential effects of exercise intensities in hippocampal BDNF, inflammatory cytokines and cell proliferation in rats during the postnatal brain development

Differential effects of exercise intensities in hippocampal BDNF, inflammatory cytokines and cell proliferation in rats during the postnatal brain development

Author Almeida, Alexandre Aparecido de Autor UNIFESP Google Scholar
Silva, Sérgio Gomes da Autor UNIFESP Google Scholar
Fernandes, Jansen Autor UNIFESP Google Scholar
Peixinho-Pena, Luiz Fernando Autor UNIFESP Google Scholar
Scorza, Fulvio Alexandre Autor UNIFESP Google Scholar
Cavalheiro, Esper Abrão Autor UNIFESP Google Scholar
Arida, Ricardo Mario Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Inst Israelita Ensino & Pesquisa Albert Einstein
Abstract It has been established that low intensities of exercise produce beneficial effects for the brain, while high intensities can cause some neuronal damage (e.g. exacerbated inflammatory response and cell death). Although these effects are documented in the mature brain, the influence of exercise intensities in the developing brain has been poorly explored. To investigate the impact of exercise intensity in developing rats, we evaluated the hippocampal level of brain derived neurotrophic factor (BDNF), inflammatory cytokines (TNF alpha, IL6 and IL10) and the occurrence of hippocampal cell degeneration and proliferation at different stages of postnatal brain development of rats submitted to two physical exercise intensities. To this point, male rats were divided into different age groups: P21, P31, P41 and P51. Each age group was submitted to two exercise intensities (low and high) on a treadmill over 10 consecutive days, except the control rats. We verified that the density of proliferating cells was significantly higher in the dentate gyrus of rats submitted to low-intensity exercise from P21 to P30 compared with high-intensity exercise and control rats. A significant increase of proliferative cell density was found in rats submitted to high-intensity exercise from P31 to P40 when compared to low-intensity exercise and control rats. Elevated hippocampal levels of 16 were detected in rats submitted to high-intensity exercise from P21 to P30 compared to control rats. From P41 to P50 period, higher levels of BDNF, TNF alpha and IL10 were found in the hippocampal formation of rats submitted to high-intensity exercise in relation to their control rats. Our data show that exercise-induced neuroplastic effects on BDNF levels and cellular proliferation in the hippocampal region are dependent on exercise intensity and developmental period. Thus, exercise intensity is an inflammation-inducing factor and exercise-induced inflammatory response during the postnatal brain development is also related to developmental stage. Our findings indicate that neuroplastic changes induced by exercise in developing rats depend on both age and training intensity. Crown Copyright (C) 2013 Published by Elsevier Ireland Ltd. All rights reserved.
Keywords Exercise
Intensity
Development
Inflammation
Brain
Plasticity
Language English
Sponsor Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
INNT (Brazil)
Date 2013-10-11
Published in Neuroscience Letters. Clare: Elsevier B.V., v. 553, p. 1-6, 2013.
ISSN 0304-3940 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 1-6
Origin http://dx.doi.org/10.1016/j.neulet.2013.08.015
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000326008700001
URI http://repositorio.unifesp.br/handle/11600/36876

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