Characterization of glucose uptake by cultured rat podocytes.

Abstract:

:The nonmetabolizable glucose analogue [(3)H]-2-deoxy-D-glucose ((3)H-2DG) was used to study glucose transport in cultured rat podocytes. Intracellular accumulation of (3)H-2DG was linear up to 20 min and was inhibited by cytochalasin B (80% inhibition) and by phlorizin (20% inhibition). Pretreatment with insulin stimulated the (3)H-2DG uptake 1.5-fold. A Hill analysis of the rate of glucose transport yielded a V(max) value of approximately 10 mM and S(0.5)of 7.8 mM. The value h = 1.0 for a Hill coefficient confirmed that glucose uptake exhibited a Michaelis-Menten kinetics. Transporters GLUT2 and GLUT4 were expressed in over 90% podocytes. Of the GLUT2- and GLUT4-expressing cells, approximately one-fourth expressed the membrane-bound fraction. We conclude that cultured rat podocytes possess a differentiated glucose transport system consisting chiefly of facilitative GLUT2 and GLUT4 transporters. It seems likely that a sodium-dependent glucose cotransporter may also be present in these cells.

journal_name

Kidney Blood Press Res

authors

Lewko B,Bryl E,Witkowski JM,Latawiec E,Gołos M,Endlich N,Hähnel B,Koksch C,Angielski S,Kriz W,Stepinski J

doi

10.1159/000080889

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

1-7

issue

1

eissn

1420-4096

issn

1423-0143

pii

80889

journal_volume

28

pub_type

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