Minocycline conducted microglia phenotype transformation attenuates early brain injury in rats after ischemia stroke
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Minocycline conducted microglia phenotype transformation attenuates early brain injury in rats after ischemia stroke
Journal of Third Military Medical UniversityVol. 39, Issue 11, Pages: 1105-1111(2017)
作者机构:
作者简介:
基金信息:
the General Program of National Natural Science Foundation of China(81571116);the National Natural Science Foundation of China(81371440);the National Basic Research and Development Program(973计划);the National Basic Research Program(2014CB541606)
Bo hang, Jun Tang, Jianbo Zhang, et al. Minocycline conducted microglia phenotype transformation attenuates early brain injury in rats after ischemia stroke[J]. Journal of Third Military Medical University, 2017, 39(11): 1105-1111.
DOI:
Bo hang, Jun Tang, Jianbo Zhang, et al. Minocycline conducted microglia phenotype transformation attenuates early brain injury in rats after ischemia stroke[J]. Journal of Third Military Medical University, 2017, 39(11): 1105-1111. DOI: 10.16016/j.1000-5404.201702080.
Minocycline conducted microglia phenotype transformation attenuates early brain injury in rats after ischemia stroke
摘要
Abstract
Objective
2
To investigate the early pathophysical characteristics of ischemic brain injury in rats
and explore the neuroprotective effects on the injury and possible involved molecular mechanisms.
Methods
2
Middle cerebral artery occlusion (MCAO) was performed in rats using a nylon suture to establish rat model of ischemic brain injury. In 6 and 24 h after MCAO
minocycline was injected intraperitoneally. Triphenyl tetrazolium chloride (TTC) staining was used to detect the infarct volume
and Tunel staining and Nissl staining were used to observe the apoptotic neurons. Immunohistochemical assay was used to detect microglial phenotype
and Western blot assay was employed to detect the expression of apoptosis pathway protein NF-κB. Morris water maze test was adopted to exam the long-term learning memory after MCAO and minocycline administration in 28 d after surgery.
Results
2
Minocycline administration significantly reduced brain infarct volume in 6 h after MCAO (43.0±5.3
vs
36.0±6.8 cm
3
P
<
0.01)
decreased the apoptotic cerebral neurons and promoted M2 microglia proliferation. However
minocycline given in 24 h after MCAO had no protective effect on infarct volume and neuron apoptosis (
P
>
0.05). In addition
minocycline decreased NF-κB protein expression in 6 h after MCAO (
P
<
0.01). The learning and memory abilities were obviously lower in the rats after 28 d of MCAO
which could be notably improved by minocycline treatment (
P
<
0.01). But such neuroprotective effects were not observed in the rats treated 24 h after MCAO (
P
>
0.05).
Conclusion
2
Minocycline i
mproves memory deficits induced by early ischemic stroke
via
M2 microglial transformation and suppression of apoptosis signal pathway
and attenuates cerebral ischemia-induced neurological inflammation and apoptosis
so as to improve learning and memory function in rats.
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