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Dexmedetomidine ameliorates intracerebral hemorrhage-induced memory impairment by inhibiting apoptosis and enhancing brain-derived neurotrophic factor expression in the rat hippocampus

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Intracerebral hemorrhage (ICH) is a severe type of stroke causing neurological dysfunction with a high mortality rate. Dexmedetomidine is an agonist for α2adrenoreceptors with sedative, anxiolytic, analgesic and anesthetic effects. In the present study, we investigated the effects of dexmedetomidine on shortterm and spatial learning memory, as well as its effects on apoptosis following the induction of ICH in rats. A rat model of IHC was created by an injection of collagenase into the hippocampus using a stereotaxic instrument. Dexmedetomidine was administered intraperitoneally daily for 14 consecutive days, commencing 1 day after the induction of ICH. The stepdown avoidance test for shortterm memory and the radial 8arm maze test for spatial learning memory were conducted. Terminal deoxynucleotidyl transferasemediated dUTP nick end-labeling (TUNEL) assay, immunohistochemistry for caspase3, and western blot analysis for Bcl2, Bax, Bid and caspase-3 expression were performed for the detection of apoptosis in the hippocampus. Western blot analysis for the brainderived neurotrophic factor (BDNF) and tyrosine kinase B (TrkB) was also performed for the detection of cell survival in the hippocampus. The induction of ICH deteriorated shortterm and spatial learning memory, increased apoptosis and suppressed BDNF and TrkB expression in the hippocampus. Treatment with dexmedetomidine ameliorated the ICHinduced impairment of shortterm and spatial learning memory by suppressing apoptosis and enhancing BDNF and TrkB expression. In the normal rats, dexmedetomidine exerted no significant effects on memory function and apoptosis. The present results suggest the possibility that dexmedetomidine may be used as a therapeutic agent for the conservation of memory function in stroke patients.
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Document Type: Research Article

Affiliations: 1: Department of Physiology, College of Medicine, Kyung Hee University, Seoul 130-701, Republic of Korea 2: Department of Physical Education, Graduate School of Education, Sang Myung University, Seoul 110-743, Republic of Korea 3: Department of Physical Activity Design, College of Science, Hanseo University, Seosan 356-706, Republic of Korea 4: Department of Anesthesiology and Pain Medicine, Gangdong Kyung Hee Hospital, College of Medicine, Kyung Hee University, Seoul 134-727, Republic of Korea

Publication date: January 1, 2013

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  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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