As3mt-flox Mouse

As3mt, also known as arsenic (3) methyltransferase, is a key enzyme involved in the methylation metabolism of arsenic [3]. It catalyzes the transfer of a methyl group from S-adenosyl-L-methionine (SAM) to trivalent arsenical, playing a role in arsenic biotransformation pathways [2,4]. This process is crucial as arsenic exposure is linked to various health issues, making As3mt an important factor in understanding arsenic-related biological impacts. Genetic models, such as humanized mouse models, can help in studying its functions [6].

In arsenic-induced non-alcoholic fatty liver disease (NAFLD), As3mt via consuming SAM blocks m6A-mediated miR-142-5p maturation, leading to elevated levels of SREBP1 and lipogenic genes, and ultimately causing liver steatosis. SAM supplementation or As3mt deficiency can block arsenic-induced lipid accumulation by promoting miR-142-5p maturation [1]. In arsenic-exposed heterozygous As3mt mice, there is low liver lipid accumulation, indicating the role of As3mt in arsenic-induced NAFLD [1]. Additionally, in arsenic-induced hepatic insulin resistance, AS3MT interacts with NLRP3 to activate the inflammasome and strengthens the m6A methylase association with NLRP3 to stabilize m6A-modified NLRP3, contributing to arsenic-induced hepatic insulin resistance [5].

In conclusion, As3mt is essential in arsenic metabolism. Studies using As3mt-related mouse models have revealed its role in diseases like NAFLD and arsenic-induced hepatic insulin resistance. Understanding As3mt's functions helps in uncovering the mechanisms of arsenic-related diseases, potentially providing new strategies for prevention and treatment.