Sv. Vyas et al., UPTAKE OF DEXTRAN SULFATE BY GLOMERULAR INTRACELLULAR VESICLES DURINGKIDNEY ULTRAFILTRATION, Kidney international, 47(3), 1995, pp. 945-950
Dextran sulphate is often used as a model for albumin in understanding
capillary-tissue exchange and the charge selective nature of the capi
llary wall, particularly in kidney ultrafiltration. In investigating t
he mechanism of transport in the kidney, autoradiographic analysis of
the distribution of iodinated dextran sulphate in perfused rat kidneys
demonstrates the preferential accumulation of the probe in the glomer
ular capillary wall. Tritium-labeled dextran sulphate is found to be s
pecifically taken up by intracellular 20 to 40 nm vesicles that can be
isolated post-perfusion. The molecular weight profile of vesicular de
xtran sulphate demonstrates that the dextran sulphate containing vesic
les are from vascular glomerular cells. Dextran is not taken up by the
vesicles. These results suggest that the apparent charge selectivity
associated with the transglomerular transport of the dextran sulphate
is associated, in part, with cell-mediated processes at the glomerular
level.