Physical exercise improves functional recovery through mitigation of autophagy, attenuation of apoptosis and enhancement of neurogenesis after MCAO in rats.

Abstract

BACKGROUND:

Physical exercise improves functional recovery after stroke through a complex mechanism that is not fully understood. Transient focal cerebral ischemia induces autophagy, apoptosis and neurogenesis in the peri-infarct region. This study is aimed to examine the effects of physical exercise on autophagy, apoptosis and neurogenesis in the peri-infarct region in a rat model of transient middle cerebral artery occlusion (MCAO).

RESULTS:

We found that autophagosomes, as labeled by microtubule-associated protein 1A light chain 3-II (LC3-II), were evident in the peri-infarct region at 3 days after 90-minute MCAO. Moreover, 44.6% of LC3-positive cells were also stained with TUNEL. The number of LC3 positive cells was significantly lower in physical exercise group than in control group at 14 and 21 days after MCAO. Suppression of autophagosomes by physical exercise was positively associated with improvement of neurological function. In addition, physical exercise significantly decreased the number of TUNEL-positive cells and increased the numbers of Ki67-positive, a proliferative marker, and insulin-like growth factor-1 (IGF-1) positive cells at 7, 14, and 21 days after MCAO.

CONCLUSIONS:

The present results demonstrate that physical exercise enhances neurological function possibly by reduction of autophagosome accumulation, attenuation of apoptosis and enhancement of neurogenesis in the peri-infarct region after transient MCAO in rats.

• Authors: Liying Zhang, Xiquan Hu, Jing Luo, Lili Li, Xingyong Chen, Ruxun Huang, Zhong Pei
• Journal: BMC neuroscience (BMC Neurosci) Vol. 14 Pg. 46 (Apr 08 2013) ISSN: 1471-2202 [Electronic] England
• PMID: 23565939 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Ki-67 Antigen
• LC3 protein, rat
• Microtubule-Associated Proteins
• Insulin-Like Growth Factor I

Topics

• Animals
• Autophagy (physiology)
• Brain Infarction (etiology, prevention & control)
• Disease Models, Animal
• In Situ Nick-End Labeling
• Infarction, Middle Cerebral Artery (pathology, physiopathology, rehabilitation)
• Insulin-Like Growth Factor I (metabolism)
• Ki-67 Antigen (metabolism)
• Male
• Microtubule-Associated Proteins (metabolism)
• Neurogenesis
• Neurologic Examination
• Physical Conditioning, Animal (methods)
• Rats
• Rats, Sprague-Dawley
• Recovery of Function (physiology)
• Time Factors