Morphine Consumption During Lactation Impairs Short-Term Neuronal Plasticity in Rat Offspring CA۱ Neurons
Publish place: Caspian Journal of Neurological Sciences، Vol: 8، Issue: 2
Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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JR_CJNS-8-2_001
تاریخ نمایه سازی: 27 فروردین 1401
Abstract:
Background: Facing environmental factors during early postnatal life, directly or indirectly via
mother-infant relationships, profoundly affects the structure and function of the mammals’ Central
Nervous System (CNS).
Objectives: This study aimed to evaluate the effect of morphine consumption during the lactation
period on short-term synaptic plasticity of the hippocampal Cornu Ammonis ۱ (CA۱) neurons in
rat offspring.
Materials & Methods: In addition to a group of control mother rats (CO), three groups
subcutaneously received ۵ (M۵), ۱۰ (M۱۰), or ۲۰ (M۲۰) mg/kg morphine every ۱۲ hours during
the lactation period. At ۴۵ days old, following the stimulation of the Schaffers’ collaterals, basic
field Excitatory Post-Synaptic Potentials (fEPSPs) were recorded in their offspring’s hippocampal
CA۱ neuronal circuits. After the construction input/output curve, paired-pulse stimulations with the
inter-stimulus intervals of ۲۰, ۸۰, and ۲۰۰ ms were applied to determine the short-term synaptic
plasticity, and the paired-pulse ratio was evaluated.
Results: The baseline synaptic responses of the rats CA۱ neurons whose mothers received ۱۰ and
۲۰ mg/kg morphine twice daily during the lactation period decreased compared to the CO animals
(P<۰.۰۱ & P<۰.۰۰۱, respectively). Furthermore, compared to the controls, the Paired-Pulse Ratio
(PPR) of the CA۱ neural circuits of M۱۰ and M۲۰ rats at ۲۰ and ۸۰ ms Inter-Stimulus Intervals
(ISI) decreased (P<۰.۰۱).
Conclusion: Morphine exposure during the lactation period has a detrimental impact on the primary
synaptic activity and short-term synaptic plasticity of the hippocampal CA۱ neuronal circuits of
rats’ offspring.
Keywords:
Authors
Fatemeh Aghighi
Physiology Research Center, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
Mohammad Shabani
Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
Sayyed Alireza Talaei
Physiology Research Center, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran