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Interaction between catecholaminergic and opioid systems in an active avoidance task
1Department of Pharmacology, University of Colorado Health Sciences Center, Denver 80262.
Behavioral and Neural Biology
|March 1, 1990
Summary
Naloxone impaired learning in mice, but its effects on memory depended on prior DSP4 treatment, suggesting state-dependent modulation. DSP4 alone impaired learning but not memory recall.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
Background:
- Noradrenergic pathways are crucial for learning and memory.
- DSP4 is a neurotoxin that selectively depletes noradrenaline.
- Naloxone is an opioid antagonist with potential effects on learning and memory.
Purpose of the Study:
- To investigate the effects of DSP4 pretreatment on naloxone's modulation of active avoidance learning and memory.
- To explore potential state-dependent effects of naloxone in noradrenergic-depleted mice.
Main Methods:
- Male NMRI mice were pretreated with DSP4 or vehicle.
- Animals underwent a two-day active avoidance task training.
- Naloxone was administered at different doses before training sessions.
Main Results:
- Naloxone dose-dependently impaired acquisition in vehicle-pretreated mice.
- Naloxone differentially affected retention in vehicle-pretreated mice (1 mg/kg facilitated, 10 mg/kg impaired).
- DSP4 alone impaired acquisition but not retention.
- Naloxone's effects on acquisition and retention were altered in DSP4-pretreated mice, suggesting state-dependent modulation.
Conclusions:
- DSP4 pretreatment alters naloxone's effects on active avoidance learning and memory.
- Results support a role for state-dependent processes in naloxone's action in noradrenergic-depleted animals.
- Further research is needed to elucidate the mechanisms underlying these state-dependent effects.