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Repeated cocaine administration increases GABA(B(1)) subunit mRNA in rat brain.
Mika Yamaguchi1, Toshihito Suzuki, Shuzo Abe
1Department of Psychiatry, Institute of Clinical Medicine, Institute of Basic Medical Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.
Synapse (New York, N.Y.)
|January 17, 2002
Summary
Repeated cocaine administration increased GABA(B(1)) mRNA in rat brain regions, correlating with behavioral sensitization. These changes returned to normal after a week, suggesting a role for GABA(B(1)) in cocaine-induced adaptations.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Cocaine addiction is a significant public health issue.
- GABA(B) receptors play a role in modulating neuronal activity and behavior.
- Understanding the molecular changes induced by cocaine is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effects of single and repeated cocaine administration on GABA(B) receptor subunit mRNA expression in rat brain.
- To explore the relationship between changes in GABA(B) receptor mRNA and cocaine-induced behavioral sensitization.
Main Methods:
- In situ hybridization was used to quantify GABA(B(1)) mRNA levels in various rat brain regions.
- Rats were administered cocaine either once or repeatedly for 14 days.
- Behavioral responses, including stereotyped behavior, were monitored.
Main Results:
- A single cocaine administration did not significantly alter GABA(B(1)) mRNA levels.
- Repeated cocaine administration led to behavioral sensitization.
- Significant increases in GABA(B(1)) mRNA were observed in the nucleus accumbens, hippocampus (CA1), and thalamus 24 hours after 14 days of cocaine treatment.
- GABA(B(1)) mRNA levels returned to baseline one week after cessation of cocaine treatment.
Conclusions:
- Repeated cocaine exposure induces specific changes in GABA(B(1)) mRNA expression in key brain areas.
- These molecular alterations are associated with the development of behavioral sensitization to cocaine.
- The findings suggest that GABA(B(1)) subunits may be involved in the neurobiological mechanisms underlying cocaine addiction.