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A codiffusing system as a novel model for capillary wall charge selectivity

M F Smit1, W D Comper

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

Biophysical Chemistry
|November 29, 1996
PubMed
Summary
This summary is machine-generated.

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Polyion-polyion interactions do not affect albumin transport across capillary walls. Electrostatic effects are negligible under physiological conditions, contrary to previous assumptions.

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Biomaterials Science

Background:

  • Polyion-polyion interactions are hypothesized to influence charged probe transport across capillary walls.
  • Capillary wall surfaces and extracellular matrix possess negative charges that may interact with charged probes.

Purpose of the Study:

  • To quantitatively assess polyion-polyion interactions affecting albumin transport.
  • To investigate the partition-diffusion of albumin in anionic polysaccharide solutions.

Main Methods:

  • Theoretical and experimental study of albumin partition-diffusion.
  • Comparison of albumin diffusion in anionic polysaccharides (dextran sulfate, heparin) versus uncharged dextran.
  • Utilized high concentrations of anionic polysaccharides (up to 250 meq l(-1)).

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Main Results:

  • Albumin partition-diffusion was identical in anionic polysaccharide and uncharged dextran matrices.
  • No significant difference was observed at equivalent polymer volume fractions.
  • Results indicate negligible charge effects from polyion-polyion interactions.

Conclusions:

  • Electrostatic interactions between polyions do not significantly impede albumin transport across capillary walls.
  • Previous assumptions regarding charge effects on transport probes are challenged.
  • Polyion-polyion interactions are negligible under physiological conditions for albumin transport.