|solute carrier family 2, (facilitated glucose transporter) member 8|
|Alt. symbols||GLUTX1, GLUT8|
|Locus||Chr. 9 q33.3|
GLUT8 is expressed mostly in neurons and testis, although expression in most other tissues has also been shown at lower levels. GLUT8 is expressed at moderate levels in the brain, most strikingly in hippocampus. Whether the glucose transporter plays any role in these cells remains to be shown.
Contrary to GLUT4, GLUT8 (previously known as GLUTX1) is not insulin-sensitive. In other words, insulin does not promote GLUT8 translocation to the cell surface in neurons as well as in transfected cell lines.
Where in the cell GLUT8 is localized in not yet clear. Most GLUT8 is not present at the cell surface. Some co-localization with both the endoplasmic reticulum and late endosomes/lysosomes has been published.
When the N-terminal di-leucine motif is mutated into a di-alanine motif, GLUT8 is located mostly at the cell surface in Xenopus oocytes and mammalian cells such as HEK 293 cells and differentiated PC12 cells.
GLUT8 function in vivo remains to be defined, despite suggestions that it may play a role in fertility, being expressed at high levels in testes and in the acrosomal part of spermatozoa. Furthermore GLUT8 appears to play an important role in the energy metabolism of sperm cells.
The recent description of GLUT8 expression in kidneys and liver suggest that the transporter may play a role in glucose uptake in these organs.
GLUT8, when expressed in Xenopus oocytes, mediates glucose uptake with high affinity. Other hexoses are not good substrates of the transporter. Whether the transporter actually mediates glucose uptake in vivo in the brain has not been evaluated yet.
Mice devoid of both copies of the SLC2A8 gene are viable, fertile and do not show any obvious phenotype. They are not diabetic, showing that GLUT8 is unlikely to play major roles in glucose homeostasis.
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