Biomol Ther.  2016 Jan;24(1):94-98. 10.4062/biomolther.2015.183.

Effects of Bisphosphonates on Glucose Transport in a Conditionally Immortalized Rat Retinal Capillary Endothelial Cell Line (TR-iBRB Cells)

• Lee NY
• Park HJ
• Kang YS

• KMID: 2170546
• DOI: http://doi.org/10.4062/biomolther.2015.183

Abstract

The objective of the present study was to elucidate the effect of bisphosphonates, anti-osteoporosis agents, on glucose uptake in retinal capillary endothelial cells under normal and high glucose conditions. The change of glucose uptake by pre-treatment of bisphosphonates at the inner blood-retinal barrier (iBRB) was determined by measuring cellular uptake of [3H]3-O-methyl glucose (3-OMG) using a conditionally immortalized rat retinal capillary endothelial cell line (TR-iBRB cells) under normal and high glucose conditions. [3H]3-OMG uptake was inhibited by simultaneous treatment of unlabeled D-glucose and 3-OMG as well as glucose transport inhibitor, cytochalasin B. On the other hand, simultaneous treatment of alendronate or pamidronate had no significant inhibitory effect on [3H]3-OMG uptake by TR-iBRB cells. Under high glucose condition of TR-iBRB cells, [3H]3-OMG uptake was increased at 48 h. However, [3H]3-OMG uptake was decreased significantly by pre-treatment of alendronate or pamidronate compared with the values for normal and high glucose conditions. Moreover, geranylgeraniol (GGOH), a mevalonate pathway intermediate, increased the uptake of [3H]3-OMG reduced by bisphosphonates pre-treatment. But, pre-treatment of histamine did not show significant inhibition of [3H]3-OMG uptake. The glucose uptake may be down regulated by inhibiting the mevalonate pathway with pre-treatment of bisphosphonates in TR-iBRB cells at high glucose condition.

Keyword

Glucose uptake; Bisphosphonates; Inner blood-retinal barrier; Retinal capillary endothelial cells; Mevalonate pathway

MeSH Terms

Alendronate
Animals
Blood-Retinal Barrier
Capillaries*
Cytochalasin B
Diphosphonates*
Endothelial Cells*
Glucose*
Hand
Histamine
Mevalonic Acid
Rats*
Retinaldehyde*
Alendronate
Cytochalasin B
Diphosphonates
Glucose
Histamine
Mevalonic Acid
Retinaldehyde