UC Davis

Noradrenaline (NA) regulates cold-stimulated adipocyte thermogenesis¹. Aside from cAMP signalling downstream of β-adrenergic receptor activation, how NA promotes thermogenic output is still not fully understood. Here, we show that coordinated α₁-adrenergic receptor (AR) and β₃-AR signalling induces the expression of thermogenic genes of the futile creatine cycle^2,3, and that early B cell factors, oestrogen-related receptors and PGC1α are required for this response in vivo. NA triggers physical and functional coupling between the α₁-AR subtype (ADRA1A) and Gα_q to promote adipocyte thermogenesis in a manner that is dependent on the effector proteins of the futile creatine cycle, creatine kinase B and tissue-non-specific alkaline phosphatase. Combined Gα_q and Gα_s signalling selectively in adipocytes promotes a continual rise in whole-body energy expenditure, and creatine kinase B is required for this effect. Thus, the ADRA1A-Gα_q-futile creatine cycle axis is a key regulator of facultative and adaptive thermogenesis.