Journal
EUROPEAN JOURNAL OF PHARMACOLOGY
Volume 865, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ejphar.2019.172806
Keywords
Vomiting; Delta(9)-THC; SR141716A; Cannabinoid CB1 receptor; Substance P; GR73632
Categories
Funding
- NIH-NCI [RO1CA207287]
- WesternU startup fund [1395]
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Delta(9)-THC suppresses cisplatin-induced vomiting through activation of cannabinoid CB1 receptors. Cisplatin-evoked emesis is predominantly due to release of serotonin and substance P (SP) in the gut and the brainstem which subsequently stimulate their corresponding 5-HT3-and neurokinin NK1-receptors to induce vomiting. Delta(9)-THC can inhibit vomiting caused either by the serotonin precursor 5-HTP, or the 5-HT3 receptor selective agonist, 2-methyserotonin. In the current study, we explored whether Delta(9)-THC and related CB1/CB2 receptor agonists (WIN55,212-2 and CP55,940) inhibit vomiting evoked by SP (50 mg/kg, i.p.) or the NK1 receptor selective agonist GR73632 (5 mg/kg, i.p.). Behavioral methods were employed to determine the antiemetic efficacy of cannabinoids in least shrews. Our results showed that administration of varying doses of Delta(9)-THC (i.p. or s.c.), WIN55,212-2 (i.p.), or CP55,940 (i.p.) caused significant suppression of SP-evoked vomiting in a dose-dependent manner. When tested against GR73632, Delta(9)-THC also dose-dependently reduced the evoked emesis. The antiemetic effect of Delta(9)-THC against SP-induced vomiting was prevented by low non-emetic doses of the CB1 receptor inverse-agonist/antagonist SR141716A (< 10 mg/kg). We also found that the NK1 receptor antagonist netupitant can significantly suppress vomiting caused by a large emetic dose of SR141716A (20 mg/kg). In sum, Delta(9)-THC and related cannabinoids suppress vomiting evoked by the nonselective (SP) and selective (GR73632) neurokinin NK1 receptor agonists via stimulation of cannabinoid CB1 receptors.
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