AUGMENTATION OF PAIRED PULSE INDEX AS SHORT-TERM PLASTICITY DUE TO MORPHINE DEPENDENCE

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HOSSEINMARDI N.; AZIMI L.; JAVAN M.; NAGHDI N.; FATH ELAHI Y.

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Journal: Physiology and Pharmacology Year:2009 | Volume:13 | Issue:2 Page(s): 108-119

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Title

AUGMENTATION OF PAIRED PULSE INDEX AS SHORT-TERM PLASTICITY DUE TO MORPHINE DEPENDENCE

Author(s)

Keywords

ADDICTIONQ3

CA1 NEURAL NETWORKSQ3

SHORT-TERM SYNAPTIC PLASTICITYQ3

Abstract

Introduction: Chronic morphine exposure can cause ADDICTION and affect synaptic plasticity, but the underlying neural mechanisms of this phenomenon remain unknown. Herein we used electrophysiologic approaches in hippocampal CA1 area to examine the effect of chronic morphine administration on short-term plasticity. Methods: Experiments were carried out on hippocampal slices taken from either control animals or animals made dependent via oral chronic morphine administration. Population spikes (PSs) were recorded from stratum pyramidale of CA1 following stimulation the Schaffer collateral afferents. For examining the SHORT-TERM SYNAPTIC PLASTICITY, paired pulse stimulations with inter pulse interval (IPI) of 10, 20, 80, and 200 ms were applied and paired pulse index (PPI) was calculated.Results: Chronic morphine exposure had no effect on the baseline response. A significant increase in PPI was observed in dependent slices at 80 ms IPI as compared to the control ones. There was no significant difference in baseline response between control and dependent slices when we used long term morphine, naloxone, and both. However, long term morphine administration caused significant difference in PPI at IPI of 20 ms. This effect was eliminated in the presence of naloxone.Conclusion: These findings suggest that morphine dependence could affect short-term plasticity in hippocampal CA1 area and increase the hippocampus network excitability.

Cites

THE ROLE OF HIPPOCAMPAL OREXIN-1 RECEPTORS (OX1R) IN MEDIATING THE EFFECT OF MORPHINE ON CA1 BASELINE SYNAPTIC RESPONSE AND SHORT TERM SYNAPTIC PLASTICITY

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APA: Copy

HOSSEINMARDI, N., AZIMI, L., JAVAN, M., NAGHDI, N., & FATH ELAHI, Y.. (2009). AUGMENTATION OF PAIRED PULSE INDEX AS SHORT-TERM PLASTICITY DUE TO MORPHINE DEPENDENCE. PHYSIOLOGY AND PHARMACOLOGY, 13(2), 108-119. SID. https://sid.ir/paper/74945/en

Vancouver: Copy

HOSSEINMARDI N., AZIMI L., JAVAN M., NAGHDI N., FATH ELAHI Y.. AUGMENTATION OF PAIRED PULSE INDEX AS SHORT-TERM PLASTICITY DUE TO MORPHINE DEPENDENCE. PHYSIOLOGY AND PHARMACOLOGY[Internet]. 2009;13(2):108-119. Available from: https://sid.ir/paper/74945/en

IEEE: Copy

N. HOSSEINMARDI, L. AZIMI, M. JAVAN, N. NAGHDI, and Y. FATH ELAHI, “AUGMENTATION OF PAIRED PULSE INDEX AS SHORT-TERM PLASTICITY DUE TO MORPHINE DEPENDENCE,” PHYSIOLOGY AND PHARMACOLOGY, vol. 13, no. 2, pp. 108–119, 2009, [Online]. Available: https://sid.ir/paper/74945/en

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