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Competition between polyanions in glomerular binding and renal clearance

M J Burne1, S V Vyas, M F Smit

  • 1Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.

Archives of Biochemistry and Biophysics
|April 15, 1997
PubMed
Summary

Exogenous polyanions like dextran sulfate do not alter albumin clearance in the kidney. Glomerular charge selectivity is minimal, and endogenous heparan sulfate shows no correlation with charge selectivity.

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Area of Science:

  • Nephrology
  • Physiology
  • Biochemistry

Background:

  • The glomerular capillary wall possesses fixed negative charges that influence the transport of charged molecules.
  • The role of exogenous polyanions in modifying these fixed charges and their impact on glomerular filtration remains incompletely understood.

Purpose of the Study:

  • To investigate whether exogenous polyanions accumulate in the glomerular capillary wall and alter transcapillary transport of charged molecules.
  • To determine the effect of dextran sulfate, heparin, and orosomucoid on albumin and dextran sulfate fractional clearance.

Main Methods:

  • Isolated perfused kidney technique was employed.
  • High concentrations of dextran sulfate, heparin, and orosomucoid were administered.
  • Fractional clearance of albumin and dextran sulfate was measured.

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Main Results:

  • Exogenous polyanions (dextran sulfate, heparin, orosomucoid) did not affect the fractional clearance of albumin.
  • Charge augmentation by exogenous polyanions was minimal compared to albumin.
  • No correlation was found between endogenous glomerular heparan sulfate charge and charge selectivity using dextran sulfate.

Conclusions:

  • Electrostatic interactions governing glomerular transcapillary transport are negligible.
  • Renal processing of dextran sulfate and albumin involves specific cellular uptake, not primarily charge-based filtration.