Solute carrier family 2, facilitated glucose transporter member 1-5 (GLUT1-5)

The GLUT1-5 glucose transporters, belonging to the Solute Carrier Family 2 (SLC2A1-5), are essential membrane proteins that facilitate the transport of glucose and other hexoses across cellular membranes [1, 4]. GLUT1 provides basal glucose uptake and is the primary transporter for the blood-brain barrier, while GLUT2 serves as a low-affinity glucose sensor in the liver and pancreatic beta cells [5, 16]. GLUT3 is the high-affinity transporter in neurons, GLUT4 is the insulin-responsive transporter in muscle and adipose tissue, and GLUT5 is specialized for fructose transport in the intestine [4, 16]. These transporters are significant therapeutic targets in oncology because many cancer cells overexpress them (particularly GLUT1 and GLUT3) to sustain the high glycolytic flux required for rapid proliferation, a phenomenon known as the Warburg effect [2, 11]. In addition to cancer, they are involved in metabolic disorders such as diabetes, where GLUT4 translocation is impaired, and GLUT1 deficiency syndrome, a genetic disorder causing seizures and developmental delays [12, 15]. Pharmacological targeting of these transporters includes small molecule inhibitors like BAY-876 and WZB117 for cancer, as well as dietary polyphenols like phloretin and quercetin [3, 10]. However, therapeutic challenges include achieving isoform specificity to avoid systemic side effects like hypoglycemia or neurotoxicity [5, 9].

Other names

SLC2A1-5Glucose transporter type 1-5Facilitated glucose transporter member 1-5Solute carrier family 2 member 1-5Class I and II facilitative glucose transporters

Competitive inhibition of glucose or fructose binding sites, non-competitive inhibition of the transporter conformational cycle, and inhibition of insulin-stimulated translocation to the plasma membrane.