Mitochondrial uncoupling protein 1 (UCP1) (UCP1)

Mitochondrial uncoupling protein 1 (UCP1), also known as thermogenin, is a specialized transport protein located in the inner mitochondrial membrane, primarily within brown adipose tissue (BAT) [1, 2]. Its primary physiological role is non-shivering thermogenesis, a process where it allows protons to leak across the mitochondrial membrane, dissipating the electrochemical gradient as heat rather than using it to drive ATP synthesis [2, 3]. By decoupling oxidative phosphorylation from ATP production, UCP1 significantly increases the metabolic rate and caloric expenditure [4]. Consequently, UCP1 is a prominent therapeutic target for the treatment of obesity, type 2 diabetes, and other metabolic disorders characterized by energy imbalance [4, 5]. While natural activators include long-chain fatty acids, pharmacological efforts focus on small molecules and indirect pathways, such as beta-3 adrenergic receptor agonists, to enhance UCP1 expression and activity [1, 5]. However, drug development faces challenges regarding tissue specificity and the potential for life-threatening hyperthermia if mitochondrial uncoupling is not tightly controlled [4, 6]. Sources: [1] UniProt P25874; [2] Frontiers in Physiology (2018) 9:167; [3] PubMed 32064112; [4] PubMed 29333454; [5] PubMed 30043130; [6] PubMed 26391456.

Other names

ThermogeninSLC25A7Solute carrier family 25 member 7UCP 1

UCP1 acts as a proton channel or carrier within the inner mitochondrial membrane that facilitates the re-entry of protons into the mitochondrial matrix, bypassing ATP synthase. This dissipation of the electrochemical proton gradient releases energy as heat rather than capturing it in the form of ATP, a process known as non-shivering thermogenesis [1, 2, 4].