Life Sciences
August 15, 2023
Lily Freeman-Striegel, John Hamilton, Renuka Kannappan et al.
Acute and chronic Δ9-THC exposure paradigms affect the body differently. More must be known about the impact of chronic Δ9-THC on cannabinoid-1 (CB1R) and mu-opioid (MOR) receptor levels in the brain. The present study examined chronic Δ9-THC's effects on CB1R and MOR levels and locomotor activity. Adolescent Sprague-Dawley rats were given daily intraperitoneal injections of Δ9-THC [0.75mg/kg...
Cerebral Cortex
May 4, 2023
Xinying Wang, Hui Zhou, Yuzheng Hu
Negative emotional state has been found to correlate with poor cognitive performance in cannabis-dependent (CD) individuals, but not healthy controls (HCs). To examine the neural substrates underlying such unusual emotion-cognition coupling, we analyzed the behavioral and resting state fMRI data from the Human Connectome Project and found opposite brain-behavior associations in the CD and HC...
Psychopharmacology
May 2023
Briac Halbout, Collin Hutson, Leann Hua et al.
The endocannabinoid system makes critical contributions to reward processing, motivation, and behavioral control. Repeated exposure to THC or other cannabinoid drugs can cause persistent adaptions in the endocannabinoid system and associated neural circuitry. It remains unclear how such treatments affect the way rewards are processed and pursued. We examined if repeated THC exposure (5...
Psychopharmacology
April 2023
Lucas Weyrich, Yasra Arif, Mikki Schantell et al.
Cannabis use is often associated with the use of other psychoactive substances, which is subsequently linked to an increased risk for addiction. While there is a growing body of neuroimaging literature investigating the cognitive effect of long-term cannabis use, very little is known about the potential additive effects of cannabis polysubstance use. Fifty-six adults composed of 18...
March 15, 2023
Will Lawn, Xuejun Hao, Anna B. Konova et al.
preprint
Background: Despite the critical role of choice processes in substance use disorders, the neurobehavioral mechanisms guiding human decisions about drugs remain poorly understood. We adapted a neuroeconomic framework to characterize the neural encoding of subjective value (SV) for cannabis versus non-drug rewards (snacks) in near-daily cannabis users. We also assessed the impact of cannabis and...
Scientific Reports
January 13, 2023
Thomas Schnell, Christina-Marie Grömm, Nils Klöckner
3 citations
Cannabis use is a common risk factor for psychoses. But although prevalence of consumption as well as potency of cannabis increased, the incidence of schizophrenia remained stable. The discontinuation hypothesis suggests that a potential increase of psychoses incidence may be relativized by more frequent cessation of consumption due to higher rates of adverse psychosis-like intoxication effects...
Vertex (Buenos Aires, Argentina)
October 10, 2022
Federico Pavlovsky, Rafael Groisman, Ana Karina Hurtado et al.
Addictions are one of the most important health problems worldwide. Within these disorders, cannabis is one of the psychoactive substances with more burden of morbidity and mortality worldwide. The actual knowledge about the effectiveness of treatments for cannabis use disorders is unsatisfactory. This review aims to explore the evidence on cannabidiol for the treatment of cannabis use...
The lancet. Psychiatry
September 2022
Kat Petrilli, Shelan Ofori, Lindsey A. Hines et al.
Cannabis potency, defined as the concentration of Δ9-tetrahydrocannabinol (THC), has increased internationally, which could increase the risk of adverse health outcomes for cannabis users. We present, to our knowledge, the first systematic review of the association of cannabis potency with mental health and addiction (PROSPERO, CRD42021226447). We searched Embase, PsycINFO, and MEDLINE (from...
Experimental and Clinical Psychopharmacology
September 1, 2022
Julie A E Christensen, David C. Fipps, J Michael Bostwick
4 citations
Hallucinogen persisting perception disorder (HPPD) is characterized by visual disturbances that resemble psychedelic intoxication and linger after use has ceased. The most common substances precipitating HPPD, lysergic acid diethylamide (LSD) and psilocybin, are posited to do so via damage to serotonergic neurons involved in vision. Mr. N is a 37-year-old with a history of alcohol, cannabis,...
Neuropsychopharmacology
August 22, 2022
Yanning Zuo, Attilio Iemolo, Patricia Montilla‐Perez et al.
24 citations
During adolescence, frequent and heavy cannabis use can lead to serious adverse health effects and cannabis use disorder (CUD). Rodent models of adolescent exposure to the main psychoactive component of cannabis, delta-9-tetrahydrocannabinol (THC), mimic the behavioral alterations observed in adolescent users. However, the underlying molecular mechanisms remain largely unknown. Here, we treated...