Ro 20-1724 Ameliorates Learning Deficit and Long-Term Memory Impairment Secondary to Repeated Ketamine Anesthesia in Young Rats — Oak Academic Publishing
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Ro 20-1724 Ameliorates Learning Deficit and Long-Term Memory Impairment Secondary to Repeated Ketamine Anesthesia in Young Rats
Department of Anesthesiology, Soochow University, Wuxi, China;
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Department of Anesthesiology, Traditional Chinese Medicine Hospital of Zhang Jiang, China;
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Department of Anesthesiology, Xuzhou Medical College, Xuzhou, China;
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Department of Anesthe- siology, Tengzhou Central People’s Hospital, Tengzhou, China;
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Department of Anesthesiology, Nemours Children’s Hospital, Or- lando, USA.
1 Department of Anesthesiology, Soochow University, Wuxi, China;
2 Department of Anesthesiology, Traditional Chinese Medicine Hospital of Zhang Jiang, China;
3 Department of Anesthesiology, Xuzhou Medical College, Xuzhou, China;
4 Department of Anesthe- siology, Tengzhou Central People’s Hospital, Tengzhou, China;
5 Department of Anesthesiology, Nemours Children’s Hospital, Or- lando, USA.
To investigate effects and possible mechanism of Ro 20-1724, a PDE4 inhibitor, on long-time learning and memory ability following repeated ketamine exposure in immature rats. Methods : Sixty 21 - day - old SD rats were randomly di vided into five groups (n = 12): C: Normal control group, S: Saline control group, K: Ketamine, K + Ro: Ketamine + Ro 20-1724, K + E : Ketamine + ethanol vehicle. Ro 20-1724 (0.5 mg·kg - 1 ) or its vehicle ( ethanol ) was administered in traperitoneally 30 minutes after ketamine anesthesia (70 mg·kg - 1 ), daily for seven days. Nine weeks after birth, the Morris water maze was used to test the ability of learning and spatial localization memory on the rats. Following be havioral testing, animals’ hippocampi were removed for Western blot and electron microscopic examination. Results : In the Morris water maze test, compared with controls, the escape latency in groups exposed to ketamine or ketamine plus the ethanol vehicle were significantly prolonged ( P < 0. 05), the ability of spatial localization was lower ( P < 0.05), and the expression of p-CREB in the hippocampus was also decreased ( P < 0.05), while there was no significant differ ence between control groups and animals treated with Ro 20-1724 following ketamine exposure ( P > 0.05). Electron microscopy demonstrated degenerative changes in hippocampal neurons of animals repetitively exposed to 70 mg·kg - 1 Ketamine, which was ameliorated by Ro 20-1724 (0.5 mg·kg - 1 ). Conclusion: The PDE-4 inhibitor Ro 20-1724 ( 0.5 mg·kg - 1 <span lang
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