Peri-adolescent THC Exposure Does not Lead to Anxiety-like Behavior in Adult Mice

As marijuana use during adolescence has been increasing, the need to understand the effects of its long-term use becomes crucial. Previous research suggested that marijuana consumption during adolescence increases the risk of developing mental illness, such as schizophrenia, depression, and anxiety. Ghrelin is a peptide produced primarily in the gut and is important for feeding behavior. Recent studies have shown that ghrelin and its receptor, the growth hormone secretagogue receptor (GHSR) play important roles in mediating stress, as well as anxiety and, depression-like behaviors in animal models. Here, we investigated the effects of chronic Tetrahydrocannabinol (THC) administration during adolescence (P42-55), in GHSR (GHSR-/-) knockout mice and their wild type littermates in relation to anxiety-like behaviors. We found that continuous THC exposure during peri-adolescence did not lead to any significant alterations in anxiety-like behavior of male adult mice, regardless of genotype. These data indicate that in the presence of intact GHSR signaling, THC exposure during peri-adolescence has limited if any long term impact on anxiety-like behaviors in mice.