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Peripheral electric stimulation inhibits morphine-induced place preference in rats
Neuroreport
|May 3, 2000
Summary
Peripheral electric stimulation (PES) with a low frequency (2 Hz) specifically reduced morphine-induced rewarding effects in rats. This effect was reversible by naloxone, suggesting opioid receptor involvement.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Pain Management
Background:
- Conditioned place preference (CPP) is a standard model for assessing drug reward.
- Morphine is a potent opioid analgesic known for its rewarding properties.
- Peripheral electric stimulation (PES) is explored for its therapeutic potential.
Purpose of the Study:
- To investigate the effect of PES on morphine-induced CPP.
- To determine if PES can modulate the rewarding effects of morphine.
- To explore the underlying mechanisms of PES action on opioid reward.
Main Methods:
- Rats were trained to associate morphine with a specific environment to establish CPP.
- PES was applied at different frequencies (2 Hz, 100 Hz, 2/100 Hz) 12 hours before testing.
- Naloxone, an opioid antagonist, was used to assess the involvement of opioid receptors.
Main Results:
- PES at 2 Hz and 2/100 Hz significantly attenuated morphine-induced CPP.
- PES at 100 Hz, foot shock, needle insertion, or restraint alone did not affect CPP.
- The inhibitory effect of low-frequency PES was reversed by naloxone.
Conclusions:
- Low-frequency PES (2 Hz) specifically inhibits the expression of morphine-induced CPP.
- The mechanism likely involves the activation of opioid receptors.
- PES may offer a non-pharmacological approach to modulate opioid reward and potentially manage opioid use disorder.