Mitochondrial uncoupling protein 2 (UCP2) (UCP2)

Mitochondrial uncoupling protein 2 (UCP2) is a protein located in the inner mitochondrial membrane that belongs to the solute carrier family 25 (SLC25A8) [1, 3]. It functions primarily to regulate mitochondrial membrane potential and reduce the production of reactive oxygen species (ROS) by facilitating a 'mild' proton leak, thereby uncoupling oxidative phosphorylation from ATP synthesis [4, 6, 11]. UCP2 also acts as a metabolite transporter, exporting four-carbon (C4) dicarboxylates such as oxaloacetate and malate from the mitochondrial matrix, which shifts cellular metabolism away from glucose oxidation toward alternative pathways like glutaminolysis [1, 17, 18]. In pathology, UCP2 is a key negative regulator of insulin secretion in pancreatic beta cells, and its overactivity is linked to the development of type 2 diabetes [6, 16, 19]. In contrast, its antioxidant and neuroprotective roles are explored as therapeutic avenues for cardiovascular and neurodegenerative diseases [5, 8, 13]. However, UCP2 is frequently upregulated in aggressive cancers, where it promotes chemoresistance and the Warburg effect by suppressing ROS-induced apoptosis and metabolic reprogramming [15, 16, 17]. Pharmacological targeting includes the inhibitor genipin and various inducers like resveratrol and fenofibrate, though its widespread tissue distribution poses significant challenges for selective therapeutic intervention [5, 8, 9].

Other names

SLC25A8UCPHBMIQ4Solute carrier family 25 member 8Dicarboxylate carrier SLC25A8Uncoupling protein 2

UCP2 modulators act by either inhibiting the protein's proton leak activity (e.g., genipin) to increase ATP production and insulin secretion, or by inducing its expression (e.g., resveratrol, fenofibrate) to enhance antioxidant defenses and reduce ROS-mediated damage [5, 8, 9, 16, 17].