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CGP 39653 binding in the chick CNS after NMDA receptor antagonist treatment
1Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA.
Abstract:
To analyze the affect of blocking neuronal activity on NMDA receptor levels during development, we have injected chick embryos with the competitive NMDA receptor antagonist NPC 12626 from E17 to E19. Brains from drug-treated (n = 7) and control (n = 6) embryos (E20) were processed for receptor autoradiography using the NMDA competitive antagonist [3H]CGP 39653. NPC 12626 treatment caused a significant 24 to 46% increase in [3H]CGP 39653 binding in both the forebrain and cerebellar cortex. The results support the hypothesis that NMDA receptor levels are regulated by activity-dependent mechanisms.
Insights
Blocking neuronal activity with an NMDA receptor antagonist increased NMDA receptor levels in developing chick brains. This suggests that neuronal activity regulates NMDA receptor expression during development.
Area of Science:
- Neuroscience
- Developmental Biology
- Neuropharmacology
Background:
- N-methyl-D-aspartate (NMDA) receptors play crucial roles in synaptic plasticity and neuronal development.
- Activity-dependent regulation of neurotransmitter receptors is a key mechanism shaping neural circuits.
Purpose of the Study:
- To investigate the impact of blocking neuronal activity on NMDA receptor expression during embryonic development.
- To determine if NMDA receptor levels are modulated by neural activity.
Main Methods:
- Chick embryos were treated with NPC 12626, a competitive NMDA receptor antagonist, from embryonic day 17 to 19.
- Brains were analyzed at embryonic day 20 using receptor autoradiography with [3H]CGP 39653, an NMDA receptor antagonist.
Main Results:
- NPC 12626 treatment led to a significant increase (24-46%) in [3H]CGP 39653 binding.
- This increase in binding was observed in both the forebrain and cerebellar cortex of treated embryos.
Conclusions:
- The findings support the hypothesis that NMDA receptor levels are regulated by activity-dependent mechanisms.
- Reduced neuronal activity results in an upregulation of NMDA receptors during chick embryonic development.