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Hippocampal long-term potentiation is reduced by chronic opiate treatment and can be restored by re-exposure to opiates.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pei, Gang |
| Copyright Year | 2002 |
| Abstract | Chronic exposure to opiates eventually leads to drug addiction, which is believed to involve maladaptive changes in brain function, but the underlying neuronal mechanisms remain primarily unknown. Given the known effects of opiates such as morphine and heroin on hippocampal function, we investigated the potential effect of chronic opiate treatment on long-term potentiation (LTP) at CA1 synapses in rat hippocampus, a leading experimental model for studying synaptic plasticity. Our results revealed that chronic exposure of rats to morphine or heroin, which induced severe drug tolerance and dependence, markedly reduced the capacity of hippocampal CA1 LTP during the period of drug withdrawal (from approximately 190% in control to approximately 120%). More interestingly, the capacity of LTP could be restored to the normal level by re-exposure of the animals to opiates, indicating that the synaptic function was already adapted to opiates. Morris water maze test, which measures behavioral consequences of synaptic plasticity, showed parallel learning deficits after chronic exposure to opiates. Moreover, the opiate-reduced LTP could also be restored by inhibitors of cAMP-dependent protein kinase A (PKA), suggesting that upregulation of cAMP pathway was likely one of the underlying mechanisms of the observed phenomena. These findings demonstrated that chronic opiate treatment can significantly modulate synaptic plasticity in the hippocampus, leading to an opiate dependence of the plasticity. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.jneurosci.org/content/22/5/1914.full.pdf |
| Alternate Webpage(s) | http://www.sibcb.ac.cn/publications/2002/2002-JNeurosci.pdf |
| PubMed reference number | 11880521v1 |
| Volume Number | 22 |
| Issue Number | 5 |
| Journal | The Journal of neuroscience : the official journal of the Society for Neuroscience |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | 8-chloro-cyclic adenosine monophosphate Addictive Behavior Adverse reaction to drug CA1 field Cyclic AMP-Dependent Protein Kinases Drug Dependence Heroin Learning Disorders Long-Term Potentiation Morphine Neuronal Plasticity Opiates Substance Withdrawal Syndrome Synapses Up-Regulation (Physiology) chemosensitization/potentiation |
| Content Type | Text |
| Resource Type | Article |
