Chronic D-tetrahydrocannabinol (D-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 agoniststimulated [S]GTPgS binding to localize cannabinoid receptor-activated G-proteins after chronic D-THC treatment. Cannabinoid (WIN 55212-2)-stimulated [S]GTPg...

Synthetic ∆ 9 -tetrahydrocannabinol (THC), pharmaceutical grade herbal cannabis as well as formulations of well-defined cannabis extracts are available as registered medicines in several countries. It is generally accepted that the main central and peripheral pharmacological effects of THC are mediated by CB1 and CB2 cannabinoid receptors. Cytochrome P450-mediated oxidations of THC afford the n...

stituent of marijuana, Cannabis sativa L. It is well known that THC is oxidized to a number of metabolites in the liver of mammals. Recent studies have clarified that P450 plays a major role in the oxidation of THC. We have previously reported that a hepatic microsomal enzyme, named microsomal alcohol oxygenase (MALCO), is able to oxidize 7aand 7b-hydroxy-D-THC to 7-oxo-D-THC in the presence of...

We have applied sweeping micellar electrokinetic chromatography (sweeping-MEKC) to the simultaneous determination of Delta(9)-tetrahydrocannabinol (THC) and its major metabolites, 11-hydroxy-Delta(9)-tetrahydrocannabinol (THC-OH) and 11-nor-9-carboxy-Delta(9)-tetrahydrocannabinol (THC-COOH). We monitored the effects of several of the sweeping-MEKC parameters, including the proportion of organic...

Cannabis contains various cannabinoids, two of which have almost opposing actions: Delta9-tetrahydrocannabinol (Delta9-THC) is psychotomimetic, whereas cannabidiol (CBD) has antipsychotic effects. Hair samples were analysed to examine levels of Delta9-THC and CBD in 140 individuals. Three clear groups emerged: ;THC only', ;THC+CBD' and those with no cannabinoid in hair. The THC only group showe...

Male albino rats, injected intravenously or intracerebroventricularly with delta 1-tetrahydrocannabinol (THC), develop mudriasis. The median effective dose of the intravenous administration group was 5 mg/kg THC, whereas that for the intracerebroventricular route was 150 microgram/kg THC. Sympathectomy significantly decreased the THC-induced mydriasis. The mydriatic effect was not influenced by...

Background: The development of novel cannabis research methods that are compatible with current federal regulations is imperative to conduct studies of the effects of legal market cannabis. There is very little research on higher strength, higher Δ9-tetrahydrocannabinol (THC), which has become increasingly available since legalization. Research on strains containing cannabidiol (CBD), a second ...

BACKGROUND Increased medical and legal cannabis intake is accompanied by greater use of cannabis vaporization and more cases of driving under the influence of cannabis. Although simultaneous Δ(9)-tetrahydrocannabinol (THC) and alcohol use is frequent, potential pharmacokinetic interactions are poorly understood. Here we studied blood and plasma vaporized cannabinoid disposition, with and withou...

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METHODS: Ten male daily cannabis smokers received around-the-clock escalating 20-mg oral tetrahydrocannabinol (THC, dronabinol) doses (40 – 120 mg/day) for 8 days. Plasma and OF samples were simultaneously collected before, during, and after dosing. OF THC, 11-hydroxy-THC and 11-nor-9carboxy-THC (THCCOOH) were quantified by GC-MS at 0.5g/L, 0.5g/L, and 7.5-ng/L limits of quantification (LOQs), ...