Regolazione dell'istidina N-metiltransferasi, ipertrofia cardiaca e insufficienza cardiaca.

BACKGROUND AND AIMS: Histamine signalling is critical in heart failure (HF). Histamine N-methyltransferase (HNMT) serves as the primary enzyme responsible for histamine clearance in heart, but its role in HF remains undefined. This study investigates HNMT-mediated metabolic-epigenetic crosstalk in HF and evaluates therapeutic strategies targeting this axis. METHODS: Cardiomyocyte-specific Hnmt-knockout and Hnmt-overexpression mice were generated. Transverse aortic constriction (TAC) was applied to induce HF in mice. RNA sequencing and targeted metabolomics were employed to explore mechanisms underlying the pathological role of HNMT. Urinary N-methylhistamine levels were measured in a cohort