Anorexia nervosa involves coordinated shutdown of the endocannabinoid system through dual epigenetic changes

A novel bidirectional epigenetic dysregulation was discovered: CNR1 (cannabinoid receptor 1) promoter hypermethylation coupled with FAAH (endocannabinoid-degrading enzyme) promoter hypomethylation. This creates a dual mechanism that systematically suppresses endocannabinoid signaling by reducing receptors while increasing signal degradation.

Case-control study analyzing DNA methylation of CNR1 and FAAH genes, genetic polymorphisms, and exosomal microRNA expression in saliva samples from anorexia nervosa patients versus healthy controls.

This identifies a specific molecular mechanism for appetite dysregulation in anorexia nervosa. The finding that both the receptor and the degradation enzyme are epigenetically altered in coordinated fashion suggests a systemic rather than incidental disruption of appetite signaling.

Anorexia nervosa has few biomarkers and limited understanding of its molecular basis. The endocannabinoid system, known for regulating appetite and reward, appears to be systematically suppressed through coordinated epigenetic changes, opening potential diagnostic and therapeutic avenues.

Saliva-based measurements may not directly reflect brain ECS function. Cannot determine if epigenetic changes cause or result from the disorder. Sample sizes not specified in abstract. Case-control design limits temporal inference.