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Swimming reduces fatty acids-associated hypothalamic damage in mice
Pedro Augusto Silva Nogueira1, Miriam Pimenta Pereira2, Jeferson José Gomes Soares2
1Institute of Biomedical Science, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil; Institute of Biology, University of Campinas, Campinas, São Paulo, Brazil; Laboratory of Cell Signaling, Department of Internal Medicine, University of Campinas, Campinas, São Paulo, Brazil.
High-fat diets harm hypothalamic nuclei controlling hunger and satiety, leading to obesity. Swimming exercise, particularly with load, mitigates this damage by preserving synapses and improving cellular health.
Area of Science:
- Neuroscience
- Metabolic Research
- Exercise Physiology
Background:
- Excess fatty acids compromise hypothalamic nuclei (arcuate, paraventricular, lateral) involved in hunger and satiety.
- Fatty acids induce inflammation via toll-like receptor 4 (TLR4), reducing responsiveness to leptin and insulin, thus promoting obesity.
Purpose of the Study:
- To investigate the effects of a high-fat diet and swimming exercise on hypothalamic nuclei.
- To assess the protective role of swimming exercise against diet-induced obesity and hypothalamic damage.
Main Methods:
- Animals were fed a high-fat diet and subjected to swimming (with/without load) for two months.
- Hypothalamic sections were immunolabeled for GFAP, synaptophysin, IL-6, and TLR4.
- Western blotting, caspase activity assays, and cytometric bead array were employed for molecular analysis.
Main Results:
- High-fat diet induced overweight, decreased hypothalamic synapses, and increased astrocytic reactivity (GFAP).
- Swimming exercise with 80% maximum load ameliorated these effects, reducing TLR4 expression and caspase activity.
- Swimming did not significantly alter hypothalamic or plasma cytokine profiles.
Conclusions:
- Swimming exercise, especially with load, positively impacts hypothalamic damage induced by high-fat diet.
- Exercise promotes cellular viability and synapse preservation in the hypothalamus of overweight animals.
- Findings suggest exercise as a strategy to counteract diet-induced metabolic and neuroinflammatory changes.
