Effect of hyperglycemia on microglial polarization after cerebral ischemia-reperfusion injury in rats

Hyperglycemia has been shown to aggravate ischemic brain damage, in which the inflammatory reaction induced by hyperglycemia is involved in the worsening of cerebral ischemia-reperfusion injury. However, the role of microglial polarization in hyperglycemia-aggravating cerebral ischemia-reperfusion i...

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Bibliographic Details
Published in:Life sciences (1973) 2021-08, Vol.279, p.119660-119660, Article 119660
Main Authors: Dong, Ling-di, Ma, Yan-mei, Xu, Jie, Guo, Yong-zhen, Yang, Lan, Guo, Feng-Ying, Wang, Min-Xing, Jing, Li, Zhang, Jian-Zhong
Format: Article
Language:English
Subjects:
Apoptosis
Brain damage
Brain injury
CD11b antigen
CD16 antigen
CD86 antigen
Cerebral blood flow
Cerebral ischemia-reperfusion
Diabetes
Diabetes mellitus
Hyperglycemia
Inflammation
Injuries
Ischemia
Microglia
Neurological diseases
Occlusion
Polarization
Reperfusion
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Summary:Hyperglycemia has been shown to aggravate ischemic brain damage, in which the inflammatory reaction induced by hyperglycemia is involved in the worsening of cerebral ischemia-reperfusion injury. However, the role of microglial polarization in hyperglycemia-aggravating cerebral ischemia-reperfusion injury remains unknown. The present study investigated whether diabetic hyperglycemia inhibited or activated microglia, as well as microglial subtypes 1 and 2. Rats were used to establish the diabetic hyperglycemia and middle cerebral artery occlusion (MCAO) model. The markers CD11b, CD16, CD32, CD86, CD206, and Arg1 were used to show M1 or M2 microglia. The results revealed increased neurological deficits, infarct volume, and neural apoptosis in rats with hyperglycemia subjected to MCAO for 30 min and reperfused at 1, 3, and 7 days compared with the normoglycemic rats. Microglia and astrocyte activation and proliferation were inhibited in hyperglycemic rats. Furthermore, M1 microglia polarization was promoted, while that of M2 microglia was inhibited in hyperglycemic rats. These findings suggested that the polarization of M1 and M2 microglia is activated and inhibited, respectively, in hyperglycemic rats and may be involved in the aggravated brain damage caused by ischemia-reperfusion in diabetic hyperglycemia.
ISSN:0024-3205
1879-0631
DOI:10.1016/j.lfs.2021.119660