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Effects of Chronic Treatment with Δ9-Tetrahydrocannabinol on Cannabinoid-Stimulated [35S]GTPγS Autoradiography in Rat Brain
Open accessAbstract
Chronic Δ 9-tetrahydrocannabinol (Δ 9-THC) administration produces tolerance to cannabinoid effects, but alterations in signal transduction that mediate these changes are not yet known. The present study uses in vitro autoradiography of agonist-stimulated [35 S]GTPγS binding to localize cannabinoid receptor-activated G-proteins after chronic Δ 9-THC treatment. Cannabinoid (WIN 55212-2)-stimulated [35 S]GTPγS binding was performed in brain sections from rats treated chronically with 10 mg/kg Δ 9-THC for 21 d. Control animals received saline or an acute injection of Δ 9-THC. Acute Δ 9-THC treatment had no effect on basal or WIN 55212-2-stimulated [35 S]GTPγS binding. After chronic Δ 9-THC treatment, net WIN 55212-2-stimulated [35 S]GTPγS binding was reduced significantly (up to 70%) in most brain regions, including the hippocampus, caudate-putamen, perirhinal and entorhinal cortex, globus pallidus, substantia nigra, and cerebellum. In contrast, chronic Δ 9-THC treatment had no effect on GABA B-stimulated [35 S]GTPγS binding. In membranes and brain sections, Δ 9-THC was a partial agonist, stimulating [35 S]GTPγS by only 20% of the level stimulated by WIN 55212-2 and inhibiting WIN 55212-2-stimulated [35 S]GTPγS at high concentrations. Because the EC 50 of WIN 55212-2-stimulated [35 S]GTPγS binding and the KD of cannabinoid receptor binding were unchanged by chronic Δ 9-THC treatment, the partial agonist actions of Δ 9-THC did not produce the decrease in cannabinoid-stimulated [35 S]GTPγS binding. These results suggest that profound desensitization of cannabinoid-activated signal transduction mechanisms occurs after chronic Δ 9-THC treatment.
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Cites
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Metadata
- Authors
- Sim, L. J., Hampson, R. E., Deadwyler, S. A., & Childers, S. R.
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 1996-12-15
- Volume
- 16
- Issue
- 24
- Pages
- 8057-8066
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- OpenAlex
- W1899328101
- Cited by
- 312
- References
- 3
- FWCI
- 11.39
- Type
- journal article
- Language
- en
- Open access
- hybrid
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