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Early Aerobic Exercise Promotes Neurological Function Recovery of Rats after Cerebral Ischemia/Reperfusion by Upregulating the Expression of Heat Shock Protein A5

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Abstract

Objective

The neuroprotective function of heat shock protein A5 (HSPA5) in ischemic stroke has been confirmed. This study aimed to investigate the effects of early aerobic exercise on neurological function recovery from cerebral ischemia/reperfusion and to determine whether these effects are associated with the expression level of HSPA5 in the ischemic penumbra.

Methods

A total of 72 male Sprague-Dawley rats were randomly assigned to the ischemia and exercise group [middle cerebral artery occlusion (MCAO)-Ex, n=18], ischemia and sedentary group (MCAO-St, n=18), sham-surgery and exercise group (Sham-Ex, n=18), or sham-surgery and sedentary group (Sham-St, n=18). The MCAO-Ex and MCAO-St groups were subjected to MCAO for 60 min, whereas the Sham-Ex and Sham-St groups were subjected to an identical operation without MCAO. Rats in the MCAO-Ex and Sham-Ex groups then ran on a treadmill for 30 min once a day for 5 consecutive days. After reperfusion, the motor function of the rats was scored by the Bederson neurological function test, balance beam test, and screen test. Nissl staining was conducted to assess morphological and structural change of nerve cells in the ischemic penumbra. The reverse transcription-quantitative polymerase chain reaction was applied to detect the mRNA expression of HSPA5. Western blot analysis was conducted to determine the protein expression of HSPA5. Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) staining was carried out in the ischemic penumbra after MCAO.

Results

Rats receiving early treadmill exercise had lower Bederson neurological function, balance beam, and screen test scores on the 3rd, 7th, and 14th days after MCAO; in addition, more neurons survived in the ischemic penumbra after MCAO, and higher mRNA and protein expression of HSPA5 and fewer TUNEL-positive stained cells were observed.

Conclusion

Our study demonstrated that early aerobic exercise can improve neurological function recovery after ischemia/reperfusion. Furthermore, the increased level of HSPA5 in the ischemic penumbra might be one of the mechanisms of enhanced neurological function recovery.

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Authors and Affiliations

  1. Department of Physiology, School of Medicine, Shanxi Datong University, Datong, 037009, China

    Zhi-feng Peng & Ji-hong Zhang

  2. Department of Neurology, Luliang People’s Hospital, Luliang, 033000, China

    Nai-bao Zhang

  3. Department of Anatomy, School of Medicine, Shanxi Datong University, Datong, 037009, China

    Jian Meng

Authors
  1. Zhi-feng Peng
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  2. Nai-bao Zhang
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  3. Jian Meng
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  4. Ji-hong Zhang
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Corresponding author

Correspondence to Zhi-feng Peng.

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The authors declare that they have no conflicts of interest.

Additional information

This study was funded by Basic Research Projects in Shanxi Province (No. 2015021178) and Start-up Funds for Doctoral Research at Shanxi Datong University (No. 2014-B-01).

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Peng, Zf., Zhang, Nb., Meng, J. et al. Early Aerobic Exercise Promotes Neurological Function Recovery of Rats after Cerebral Ischemia/Reperfusion by Upregulating the Expression of Heat Shock Protein A5. CURR MED SCI 42, 267–273 (2022). https://doi.org/10.1007/s11596-022-2537-0

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  • DOI: https://doi.org/10.1007/s11596-022-2537-0

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