CCK-8 Inhibits Acute Morphine-induced Spatial Reference Memory Impairment in Mice

CCK-8 Inhibits Acute Morphine-induced Spatial Reference Memory Impairment in Mice Administration of morphine may impair learning and memory processes. Cholecystokinin has been reported to be involved in various types of memory, and our previous study found that Cholecystokinin octapeptide attenuates spatial memory impairment in chronic morphine-treated mice. However, the effect of CCK-8 on acute morphine-induced memory impairment is not clear. In this study, effect of acute CCK-8 and morphine on spatial reference memory was evaluated using Morris water maze in KM mice. Acetylcholine (Ach) content was measured using ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC–MS/MS). Pre-training with morphine (5, 10 mg/kg, i.p.) significantly impaired spatial reference memory acquisition without disturbing the performance in the visible platform task, while pre-test morphine has no effect on memory retrieval. Pre-training (0.01, 0.1 and 1 μg, i.c.v.) or pre-test (0.1 and 1 μg, i.c.v.) of CCK-8 facilitated spatial reference memory acquisition and retrieval, respectively. CCK-8 (0.1 and 1 μg) significantly attenuated memory loss by pre-training morphine. Furthermore, CCK-8 (1 μg, i.c.v) increased acetylcholine contents of hippocampus in saline or morphine-treated mice. Our study identifies CCK-8 reversed spatial reference memory loss induced by acute morphine, and the mnemonic effect could be related to the facilitation of CCK-8 on memory acquisition and retrieval through accelerating acetylcholine release in hippocampus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Peptide Research and Therapeutics Springer Journals

CCK-8 Inhibits Acute Morphine-induced Spatial Reference Memory Impairment in Mice

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Publisher
Springer Netherlands
Copyright
Copyright © 2016 by Springer Science+Business Media New York
Subject
Life Sciences; Biochemistry, general; Animal Anatomy / Morphology / Histology; Polymer Sciences; Pharmaceutical Sciences/Technology; Pharmacology/Toxicology; Molecular Medicine
ISSN
1573-3149
eISSN
1573-3904
D.O.I.
10.1007/s10989-016-9568-y
Publisher site
See Article on Publisher Site

Abstract

Administration of morphine may impair learning and memory processes. Cholecystokinin has been reported to be involved in various types of memory, and our previous study found that Cholecystokinin octapeptide attenuates spatial memory impairment in chronic morphine-treated mice. However, the effect of CCK-8 on acute morphine-induced memory impairment is not clear. In this study, effect of acute CCK-8 and morphine on spatial reference memory was evaluated using Morris water maze in KM mice. Acetylcholine (Ach) content was measured using ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC–MS/MS). Pre-training with morphine (5, 10 mg/kg, i.p.) significantly impaired spatial reference memory acquisition without disturbing the performance in the visible platform task, while pre-test morphine has no effect on memory retrieval. Pre-training (0.01, 0.1 and 1 μg, i.c.v.) or pre-test (0.1 and 1 μg, i.c.v.) of CCK-8 facilitated spatial reference memory acquisition and retrieval, respectively. CCK-8 (0.1 and 1 μg) significantly attenuated memory loss by pre-training morphine. Furthermore, CCK-8 (1 μg, i.c.v) increased acetylcholine contents of hippocampus in saline or morphine-treated mice. Our study identifies CCK-8 reversed spatial reference memory loss induced by acute morphine, and the mnemonic effect could be related to the facilitation of CCK-8 on memory acquisition and retrieval through accelerating acetylcholine release in hippocampus.

Journal

International Journal of Peptide Research and TherapeuticsSpringer Journals

Published: Dec 22, 2016

References

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