|, GLUT2, solute carrier family 2 member 2|
Glucose transporter 2 (GLUT2) also known as solute carrier family 2 (facilitated glucose transporter), member 2 (SLC2A2) is a transmembrane carrier protein that enables protein facilitated glucose movement across cell membranes. It is the principal transporter for transfer of glucose between liver and blood, and has a role in renal glucose reabsorption. It is also capable of transporting fructose. Unlike GLUT4, it does not rely on insulin for facilitated diffusion.
GLUT2 is found in cellular membranes of:
- liver (Primary)
- pancreatic β cell (Primary)
- hypothalamus (Not overly significant)
- basolateral membrane of small intestine and apical GLUT2 is also suggested.
- basolateral membrane of renal tubular cells
GLUT2 has high capacity for glucose but low affinity (high Km, ca. 15-20 mM) and thus functions as part of the "glucose sensor" in the pancreatic β-cells of rodents, though in human β-cells the role of GLUT2 seems to be a minor one. It is a very efficient carrier for glucose.
When the glucose concentration in the lumen of the small intestine goes above 30 mM, such as occurs in the fed-state, GLUT2 is up-regulated at the brush border membrane, enhancing the capacity of glucose transport. Basolateral GLUT2 in enterocytes also aids in the transport of fructose into the bloodstream through glucose-dependent cotransport.
In drug-treated diabetic pregnancies in which glucose levels in the woman are uncontrolled, neural tube and cardiac defects in the early-developing brain, spine, and heart depend upon functional GLUT2 carriers, and defects in the GLUT2 gene have been shown to be protective against such defects in rats. However, whilst a lack of GLUT2 adaptability is negative, it is important to remember the fact that the main result of untreated gestational diabetes appears to cause babies to be of above-average size, which may well be an advantage that is managed very well with a healthy GLUT2 status.
GLUT2 appears to be particularly important to osmoregulation, and preventing edema-induced stroke, transient ischemic attack or coma, especially when blood glucose concentration is above average. GLUT2 could reasonably be referred to as the "diabetic glucose transporter" or a "stress hyperglycemia glucose transporter."
Interactive pathway map
Click on genes, proteins and metabolites below to link to respective articles. [§ 1]
- The interactive pathway map can be edited at WikiPathways: "GlycolysisGluconeogenesis_WP534".
- "Human PubMed Reference:".
- "Mouse PubMed Reference:".
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- Thomson AB, Wild G (March 1997). "Adaptation of intestinal nutrient transport in health and disease. Part I". Digestive Diseases and Sciences. 42 (3): 453–69. PMID 9073126. doi:10.1023/A:1018807120691.
- Stolarczyk E, Le Gall M, Even P, Houllier A, Serradas P, Brot-Laroche E, Leturque A (December 2007). Maedler K, ed. "Loss of sugar detection by GLUT2 affects glucose homeostasis in mice". PloS One. 2 (12): e1288. PMC . PMID 18074013. doi:10.1371/journal.pone.0001288.