Enhancement of glucose transport by vascular endothelial growth factor in retinal endothelial cells

H Sone, B K Deo, A K Kumagai
Investigative Ophthalmology & Visual Science 2000, 41 (7): 1876-84

PURPOSE: To investigate effects of vascular endothelial growth factor (VEGF) on glucose transport and GLUT1 glucose transporter expression in primary bovine retinal endothelial cell (BREC) cultures.

METHODS: Glucose transport in control and VEGF-treated BREC cultures was determined by measurement of [14C]-3-O-methylglucose (3MG) uptake. GLUT1 protein and mRNA was determined by Western and Northern blot analyses, respectively. Protein kinase C (PKC) activity was measured in control and VEGF-treated cultures, and glucose transport was determined with and without prior PKC depletion and PKC inhibition.

RESULTS: Dose-dependent increases in 3MG uptake were seen in the VEGF-treated cultures, with an increase of 69% after a 24-hour exposure to 50 ng/ml VEGF (P < 0.001). Total cellular GLUT1 mRNA or protein, however, was unchanged. Western blot analysis of plasma membrane fractions revealed a 75% increase in plasma membrane GLUT1 in VEGF-treated cultures (P = 0.02), suggesting that the VEGF-stimulated increase in glucose transport was due to a translocation of GLUT1 to the cell membrane. VEGF stimulated a 90% increase in PKC activity in membrane fractions from cultures treated with VEGF, and VEGF-stimulated enhancement of glucose transport was abolished by cellular PKC depletion and by general and PKC beta inhibition.

CONCLUSIONS: The present study demonstrates VEGF-mediated enhancement of retinal endothelial cell glucose transport and suggests that this increase is due to PKC beta-mediated translocation of cytosolic GLUT1 to the plasma membrane surface. Upregulation of retinal endothelial cell glucose transport by various factors associated with the development of retinopathy may be responsible for the metabolic derangements observed in the diabetic inner blood-retinal barrier in vivo.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"