Strain-specific response to pharmacological cold mimicking in aging mice

BackgroundAging impairs thermogenic and metabolic flexibility, increasing metabolic disease risk. We examined six aging male mouse strains for responses to chronic topical menthol, a pharmacological cold mimetic. Material and methodsMale (C57BL/6J, A/J, BALB/c, C3H/hej, DBA/2J, and FVB/NJ) mice were treated with 4g/kg of 10% menthol weight per volume cream once per day or vehicle as control using finger application for 15 days. After last application, core body temperature measurement, BAT thermography, Nesting behaviour, and metabolic tolerance test were performed, and gene expression was analysed in BAT. ResultsMenthol improved core temperature recovery via thermogenesis and enhanced insulin sensitivity across all strains. However, effects on BAT mass, nesting behaviour, and gluconeogenesis were strain-dependent. ConclusionCollectively, these findings highlight that genetic background modulates metabolic responses to cold mimetics, informing future precision strategies for age-related metabolic disorders.