title: Studies on the agonistic activity of delta 9-11-tetrahydrocannabinol in mice, dogs and rhesus monkeys and its interactions with delta 9-tetrahydrocannabinol.
abstract: The present studies examine some of the pharmacological effects of delta-9 (11)-tetrahydrocannabinol (delta 9-11-THC), an analog of delta-9-tetrahydrocannabinol (delta 9-THC). In tests with mice, delta 9-11-THC was similar to but less potent than delta 9-THC in producing hypothermia, analgesia, lethality and in reducing spontaneous activity. In dogs delta 9-THC but not delta 9-11-THC produced classical cannabimimetic signs including static ataxia, hyperreflexia, prancing and tail-tuck. delta 9-11-THC did produce central nervous system depression in 9 of the 15 dogs tested but the effects were not dose-related and appeared earlier and dissipated faster than the depressive effects induced by delta 9-THC. delta 9-THC but not delta 9-11-THC produced signs of ptosis, sedation and ataxia in rhesus monkeys. delta 9-THC also suppressed operant responding completely in four of four monkeys tested whereas in one monkey delta 9-11-THC did not do so up to doses as high as 5.0 mg/kg and was 8 to 100 times less potent in doing so in the other monkeys. When monkeys were pretreated with delta 9-11-THC the doses of delta 9-THC required to produce ptosis, sedation, ataxia and operant suppression were increased. However, when mice and dogs were pretreated with delta 9-11-THC the effects of delta 9-THC were not attenuated and usually were enhanced. The pharmacological profile of delta 9-11-THC is unusual in that it seems to have cannabimimetic activity in mice, noncannabimimetic-like effects in dogs and is perhaps devoid of cannabimimetic effects in rhesus monkeys. In addition, pretreatment with delta 9-11-THC attenuates the cannabimimetic effects of delta 9-THC in rhesus monkeys but not in mice or dogs.
mesh_terms: D000698:Analgesia; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001831:Body Temperature / Q000187:drug effects; D003216:Conditioning, Operant / Q000187:drug effects; D004285:Dogs; D013759:Dronabinol / Q000494:pharmacology* / Q000031:analogs & derivatives; D004347:Drug Interactions; D008253:Macaca mulatta; D051379:Mice; D013045:Species Specificity
chemical_list: C052413:delta(9-11)-tetrahydrocannabinol; D013759:Dronabinol