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• W2609029672 abstract "Recent reports of ammonia released during cannabis smoking raise concerns about putative neurotoxic effects. Cannabis (54 mg) was administered in a double-blind, placebo-controlled design to healthy cannabis users (n=15) either orally, or through smoking (6.9%THC cigarette) or inhalation of vaporized cannabis (Volcano®). Serial assay of plasma ammonia concentrations at 0, 2, 4, 6, 8, 10, 15, 30, and 90 min from onset of cannabis administration showed significant time (P=0.016), and treatment (P=0.0004) effects with robust differences between placebo and edible at 30 (P=0.002), and 90 min (P=0.007) and between placebo and vaporized (P=0.02) and smoking routes (P=0.01) at 90 min. Furthermore, plasma ammonia positively correlated with blood THC concentrations (P=0.03). To test the hypothesis that this delayed increase in plasma ammonia originates from the brain we administered THC (3 and 10mg/kg) to mice and measured plasma, liver, and brain ammonia concentrations at 1, 3, 5 and 30 min post-injection. Administration of THC to mice did not cause significant change in plasma ammonia concentrations within the first 5 min, but significantly reduced striatal glutamine-synthetase (GS) activity (P=0.046) and increased striatal ammonia concentration (P=0.016). Furthermore, plasma THC correlated positively with striatal ammonia concentration (P<0.001) and negatively with striatal GS activity (P=0.030). At 30 min, we found marked increase in striatal ammonia (P<0.0001) associated with significant increase in plasma ammonia (P=0.042) concentration. In conclusion, the results of these studies demonstrate that cannabis intake caused time and route-dependent increases in plasma ammonia concentrations in human cannabis users and reduced brain GS activity and increased brain and plasma ammonia concentrations in mice." @default.
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• W2609029672 date "2017-07-01" @default.
• W2609029672 modified "2023-09-25" @default.
• W2609029672 title "The acute effect of cannabis on plasma, liver and brain ammonia dynamics, a translational study" @default.
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• W2609029672 doi "https://doi.org/10.1016/j.euroneuro.2017.03.006" @default.
• W2609029672 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6091863" @default.
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