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Interactions between topically applied excitatory amino acids on rat cerebral cortex: discrimination by
Experimental Brain Research
|January 1, 1987
Summary
Excitatory amino acids interact in complex ways, affecting somatosensory evoked potentials (SEPs). Findings suggest a desensitization phenomenon occurs between these amino acids, distal to their receptor sites.
Area of Science:
- Neuroscience
- Neuropharmacology
Background:
- Excitatory amino acids play crucial roles in synaptic transmission.
- Understanding their interactions is vital for deciphering neural circuit function.
Purpose of the Study:
- To investigate the interactive effects of topically applied excitatory amino acid receptor agonists on somatosensory evoked potentials (SEPs) in rats.
- To elucidate the mechanisms underlying these interactions, particularly desensitization phenomena.
Main Methods:
- Urethane anesthesia was used in rats.
- Somatosensory evoked potentials (SEPs) were recorded.
- Various excitatory amino acid receptor agonists, including N-methyl-D, L-aspartic acid (NMDLA), quinolinic acid, kainic acid, and quisqualic acid, were applied topically.
Main Results:
- Pre-application of N-methyl-D, L-aspartic acid (NMDLA) blocked the effects of quinolinic acid and kainic acid, but not carbachol or KCl.
- Quisqualic acid blocked the effects of NMDLA and kainic acid, but not carbachol.
- Pentobarbital selectively inhibited the suppressive effect of quisqualic acid on NMDLA responses.
Conclusions:
- A desensitization phenomenon appears to occur between excitatory amino acids.
- This desensitization occurs at a site distal to the receptor.
- The findings provide insights into the complex interplay of excitatory amino acid receptor systems.