Abstract
The aim of this study is to investigate whether ketamine, a noncompetitive N-methyl-d-aspartate receptor (NMDAR) antagonist, had an influence on learning and memory in developing mice. Fifty Kunming mice aged 21 days were randomly divided into 5 subgroups (n = 10 for each) to receive intraperitoneal injection of equal volume of saline (S group) or ketamine (25, 50 or 100 mg/kg of body weight/day) for 7 consecutive days, or to be left untreated (C group). A step-down passive avoidance test was performed to evaluate learning and memory in these mice on days 8 and 9. Additionally, the expression of brain-derived neurotrophic factor (BDNF) in the hippocampus was determined. Rats receiving saline or sub-anesthetic dose of ketamine (25 mg/kg) showed significantly decreased abilities of learning and memory and reduced expression of BDNF, compared to the normal controls (P < 0.05). In contrast, comparable abilities of learning and memory and expression of BDNF were found for anesthetic doses of ketamine (50 or 100 mg/kg)-treated rats and controls (P > 0.05). Repetitive mechanical stress impairs learning and memory performance in developing mice, which may be associated with decreased BDNF expression. The stress-induced learning and memory impairment can be prevented by anesthetic doses of ketamine.
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Acknowledgments
This work was supported by Medical Science Research Foundation of Jiangsu Province, China (Grant No. H200645) and Science Foundation of the Health Bureau of Wuxi City, China (Grant No. XM0805).
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Peng, S., Zhang, Y., Wang, H. et al. Anesthetic ketamine counteracts repetitive mechanical stress-induced learning and memory impairment in developing mice. Mol Biol Rep 38, 4347–4351 (2011). https://doi.org/10.1007/s11033-010-0561-9
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DOI: https://doi.org/10.1007/s11033-010-0561-9