Abstract
Preconditioning exercise prior to stroke exerts neuroprotection, which is an endogenous strategy that leads the brain cells to express several intrinsic factors and inhibits their apoptosis. However, it is unclear how long these benefits last after exercise cessation. The aim of this study was to investigate the effects of detraining on preconditioning exercise-induced neuroprotective potential after stroke. Rats were trained using a treadmill for aerobic exercise 5 days each week for 3 weeks, and their neuroprotective effects were examined until 3 weeks after exercise cessation. Stroke was induced by 60 min of left middle cerebral artery occlusion at 3 days, 1, 2, and 3 weeks after exercise cessation. Infarct volume, neurological deficits, sensorimotor function, expression levels of brain-derived neurotrophic factor (BDNF), hypoxia-induced factor-1α (HIF-1α), glial fibrillary acidic protein (GFAP), and P2X7 receptors, and apoptosis activity were examined using immunohistochemical and western blot analyses. Preconditioning exercise significantly reduced infarct volume and ameliorated sensorimotor function after stroke, and its beneficial effects were observed until 2 weeks after exercise cessation. The expression level of BDNF in the ischemic brain was significantly upregulated at 3 days after exercise cessation; however, the expression levels of HIF-1α, GFAP, and P2X7 receptor were significantly increased until 2 weeks after exercise cessation; thereby, significant anti-apoptotic effects were lost at 3 weeks of detraining. Our findings suggest that preconditioning exercise-induced neuroprotective potential may be lost shortly after exercise cessation. Neuroprotection through intrinsic protective factors, such as BDNF and HIF-1α, may provide different neuroprotective mechanisms in a time-dependent manner during detraining.
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Abbreviations
- BDNF:
-
Brain-derived neurotrophic factor
- NGF:
-
Nerve growth factor
- MCAO:
-
Middle cerebral artery occlusion
- HIF-1α:
-
Hypoxia-induced factor-1α
- TTC:
-
2,3,5–Triphenyltetrazorlium chloride
- GFAP:
-
Glial fibrillary acidic protein
- Bax:
-
Anti-B-cell lymphoma 2-associated X protein
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Acknowledgements
The authors would like to thank Mr. Yuki Itashiki and Mr. Keita Fukumaru for their assistance in this animal study.
Funding
This work was supported by grants from JSPS KAKENHI (Grant No. JP20H0403 to Harutoshi Sakakima and Grant No. JP19K24315 to Shotaro Otsuka).
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All authors contributed to this study. This study is based on the original ideas of HS, SO, HM, and IM. SO, AT, ST, KN (Kazuki Nakanishi), and KN (Kosuke Norimatsu) performed the experiments and carried out the animal, histochemical and biochemical studies, as well as the quantitative analysis. HS and SO performed the literature review and wrote the manuscript. All authors read and approved the final manuscript.
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The experimental protocol was approved by the Ethics Board of the Institute of Laboratory Animal Sciences of Kagoshima University.
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Otsuka, S., Sakakima, H., Tani, A. et al. Effects of detraining on preconditioning exercise-induced neuroprotective potential after ischemic stroke in rats. Brain Struct Funct 226, 2169–2180 (2021). https://doi.org/10.1007/s00429-021-02317-5
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DOI: https://doi.org/10.1007/s00429-021-02317-5