Objective Nitric oxide （NO） was speculated to play an Minocycline, a tetracycline derivative, reduced inflammation important role in the pathophysiology of cerebral ischemia. and protected against cerebral ischemia....
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Objective Nitric oxide （NO） was speculated to play an Minocycline, a tetracycline derivative, reduced inflammation important role in the pathophysiology of cerebral ischemia. and protected against cerebral ischemia. To study the neuroprotection mechanism of minocycline for vascular dementia, the influences of minocycline on expressions of inducible nitric oxide synthase （iNOS） and endothelial nitric oxide synthase （eNOS） were observed in the brains of Wistar rats. Methods The vascular dementia rat model was established by permanent bilateral common carotid arteries occlusion （BCCAO）. Wistar rats were divideded into 3 groups randomly： sham-operation group （S group）, vascular dementia model group （M group）, and minocycline treatment group （MT group）. The behaviour was tested with Morris water maze and open-field task. Expressions of iNOS and eNOS were measured by immunohistochemistry and reverse transcriptase-polymerase chain reaction （RT-PCR）. The optical density value was measured by imaging analysis. Percentage of positive ceils with iNOS and eNOS expression was analyzed with optical microscope. Results Minocycline attenuated cognitive impairment. Inducible NOS was significantly down-regulated in MT group, compared with that in M group （P 〈 0.01）, while eNOS was significantly up-regulated, compared with that in M group （P 〈 0.01）. The expressions of iNOS and eNOS in M and MT groups were higher than those in S group （P 〈 0.01）. Conclusion Minocycline can down-regulate the expression of iNOS and up-regulate the expression of eNOS in vascular dementia, which restrains apoptosis and oxidative stress to protect neural function.
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