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Chronic maternal morphine exposure and early-life adversity induce impairment in synaptic plasticity of adolescent male rats. | LitMetric

AI Article Synopsis

Article Abstract

Maternal morphine exposure has negative consequences for learning and memory in the offspring. Interaction between mothers and pups has a crucial effect on the mammal's development. Maternal Separation (MS) can cause behavioral and neuropsychiatric problems later in life. It seems that adolescents are more susceptible to the effects of early life stress; evidence for the combinatory effects of oral chronic maternal morphine exposure and MS in the CA1 area of the hippocampus in the male adolescent offspring is not found. Therefore, this study aimed to evaluate the effects of chronic maternal morphine consumption (21 days before and after mating, and gestation), and MS (180 min/day from postnatal day (PND) 1-21) on the synaptic plasticity of male offspring in mid-adolescence. Control, MS, Vehicle (V), Morphine, V + MS, and Morphine + MS groups were tested for in vivo field potential recording from the CA1 area of the hippocampus. The current results demonstrated that chronic maternal morphine exposure impaired the induction of early long-term potentiation (LTP). MS impaired average fEPSPs, induction of early-LTP and maintenance. Chronic maternal morphine exposure in combination with MS impaired the induction of early LTP but didn't deteriorate maintenance and the average field excitatory post-synaptic potentials (fEPSPs) measured in two hours. Prepulse facilitation ratios remained undisturbed and I/O curves showed decreased fEPSP slopes at high stimulus intensities in combinatory group. We concluded that chronic maternal morphine exposure in combination with MS negatively affects synaptic plasticity in the CA1 area in male adolescent offspring.

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http://dx.doi.org/10.1016/j.neulet.2023.137365DOI Listing

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