1. Minocycline inhibits 5-lipoxygenase expression and accelerates functional recovery in chronic phase of focal cerebral ischemia in rats
- Author
-
Wei-Ping Zhang, Li-Sheng Chu, Ji Sun, San-Hua Fang, Wei-Yan Chen, Yu Zhou, Meng-Ling Wang, Er-Qing Wei, Yuan-Jun Yin, and Jian-Hao Li
- Subjects
Male ,Ischemia ,Cell Count ,Minocycline ,Inflammation ,Pharmacology ,General Biochemistry, Genetics and Molecular Biology ,Brain Ischemia ,Rats, Sprague-Dawley ,Brain ischemia ,medicine ,Animals ,Lipoxygenase Inhibitors ,General Pharmacology, Toxicology and Pharmaceutics ,Maze Learning ,Cell Proliferation ,Neurons ,Microglia ,business.industry ,Macrophages ,Brain ,Recovery of Function ,General Medicine ,medicine.disease ,Immunohistochemistry ,Rats ,Astrogliosis ,Neuroprotective Agents ,medicine.anatomical_structure ,Gliosis ,Astrocytes ,Anesthesia ,Chronic Disease ,Agnosia ,Neuron ,medicine.symptom ,business ,Injections, Intraperitoneal ,medicine.drug - Abstract
Aims We previously reported that minocycline attenuates acute brain injury and inflammation after focal cerebral ischemia, and this is partly mediated by inhibition of 5-lipoxygenase (5-LOX) expression. Here, we determined the protective effect of minocycline on chronic ischemic brain injury and its relation with the inhibition of 5-LOX expression after focal cerebral ischemia. Main methods Focal cerebral ischemia was induced by 90 min of middle cerebral artery occlusion followed by reperfusion for 36 days. Minocycline (45 mg/kg) was administered intraperitoneally 2 h and 12 h after ischemia and then every 12 h for 5 days. Sensorimotor function was evaluated 1–28 days after ischemia and cognitive function was determined 30–35 days after ischemia. Thereafter, infarct volume, neuron density, astrogliosis, and 5-LOX expression in the brain were determined. Key findings Minocycline accelerated the recovery of sensorimotor and cognitive functions, attenuated the loss of neuron density, and inhibited astrogliosis in the boundary zone around the ischemic core, but did not affect infarct volume. Minocycline significantly inhibited the increased 5-LOX expression in the proliferated astrocytes in the boundary zone, and in the macrophages/microglia in the ischemic core. Significance Minocycline accelerates functional recovery in the chronic phase of focal cerebral ischemia, which may be partly associated with the reduction of 5-LOX expression.
- Published
- 2010
- Full Text
- View/download PDF