Journal
TRENDS IN PHARMACOLOGICAL SCIENCES
Volume 25, Issue 6, Pages 325-330Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tips.2004.04.005
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Funding
- NIDA NIH HHS [DA-05274, DA-03672, DA-14277] Funding Source: Medline
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Considerable plasticity exists in the endogenous cannabinoid system, as evidenced by the high degree of tolerance that develops following repetitive exposure to exogenously administered cannabinoid receptor agonists. This tolerance development is accompanied by cannabinoid CB1 receptor downregulation and attenuation of G-protein activation. The biological processes responsible for CB1 receptor downregulation remain to be fully understood. However, recent evidence suggests that several protein kinases participate in the development of cannabinoid tolerance. These observations implicate a role for protein kinases in cannabinoid signaling pathways. It remains to be established whether these protein kinases are directly involved in CB1 receptor regulation or whether they contribute to tolerance by modulating additional signaling pathways.
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