Acute and chronic exercise modulates the expression of MOR opioid receptors in the hippocampal formation of rats

Brain Research Bulletin
Mônica Sílvia Rodrigues de OliveiraRicardo Mario Arida

Abstract

Exercise stimulates the release of beta-endorphin and other endogenous opioid peptides that are believed to be responsible for changes in mood, perception of pain and also performance. Although the vast majority of literature data support the role of physical exercise in increasing beta-endorphin levels, indirect measures such as increased endorphin levels in peripheral blood do not reflect opioid levels in the central nervous system. The purpose of the present study was to verify whether acute and chronic exercise using both voluntary and forced exercise procedures could modify the expression of μ-opioid receptors (MOR) in rat hippocampal formation. Immunoblotting analysis showed significantly enhanced MOR expression in the hippocampal formation in the acute (forced and voluntary) exercise groups when compared to the control group. Conversely, a significant reduction of MOR expression was noted in the chronic forced and chronic voluntary exercise groups compared to the acute forced and voluntary groups respectively. MOR expression was not significantly different in rats trained using both acute or chronic exercise. Immunohistochemistry analysis showed a higher number of MOR-positive cells for acute forced and voluntary exercis...Continue Reading

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Citations

Oct 11, 2011·Peptides·Richard J Bodnar
Oct 21, 2014·Journal of Neurochemistry·Ricardo Mario AridaLuisa Rocha
Jun 29, 2013·Neuroscience and Biobehavioral Reviews·Wendy J LynchMark A Smith
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