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    Effect of high-intensity exercise on endoplasmic reticulum stress and proinflammatory cytokine levels
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2023) Korkmaz, K.; Duzova, H.; Taslidere, A. Cetin; Koc, A.; Karaca, Z. M.; Durmus, K.
    Objectives. - High-intensity exercise impairs ER functions and elevates pro-inflammatory cytokines and neurotrophins levels. We investigated the effects of different intensity swimming exercises on ER stress of muscle damage with the impact of IL-23 and neurotrophic factors. Equipment and methods. - Rats were divided into three groups control (n = 9), normal swimming exercise (NSE) (n = 8), and weight-loaded swimming exercise (WLSE) (n = 9). Ventricle and skeletal muscle ATF4 and GRP78 levels were measured by Western Blot, and serum IL-17, IL-23, BDNF, NT-3, and NGF levels by ELISA method. Caspase-3 immunohistochemistry evaluation of skeletal muscle tissues was performed. Results. - The GRP78 level in the gastrocnemius muscle in the NSE group decreased, while the ATF4 level increased compared to other groups (P < 0.05). The ATF4 levels in heart muscle in the NSE group increased compared to the WLSE group (P < 0.05). The serum NT-3 level in the WLSE group rats increased compared to the other groups (P < 0.008). Intense Caspase-3 positive staining muscle cells were observed in the WLSE group compared to the control group (P <= 0.0001). Conclusions. - In response to high-intensity exercise, while pro-inflammatory cytokines, BDNF, and NGF adaptation in the body take place, also NT-3 secretion causing cell damage by the caspase system to cope with ER stress increasement is seen. In conclusion, this study shows us that high-intensity exercise may cause myopathy in the heart and skeletal muscle. (c) 2023 Elsevier Masson SAS. All rights reserved.