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Blood-flow sensing by anionic biopolymers

G Siegel1, M Malmsten, D Klüssendorf

  • 1Institute of Physiology, Freie Universität Berlin, Germany.

Journal of the Autonomic Nervous System
|March 7, 1996
PubMed
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Proteoheparan sulfate acts as a cellular flow sensor, changing shape to bind sodium ions (Na+) under increased blood flow. This binding initiates a signal cascade promoting vasodilation, crucial for regulating blood vessel tone.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Endothelial cells possess mechanisms to sense and respond to blood flow.
  • Proteoglycans, particularly heparan sulfate proteoglycans, are abundant in the endothelial glycocalyx.
  • The role of proteoheparan sulfate in mechanotransduction remains an area of active investigation.

Purpose of the Study:

  • To investigate the function of proteoheparan sulfate as a "flow sensor" in endothelial cells.
  • To elucidate the molecular mechanisms by which proteoheparan sulfate mediates flow-dependent vasodilation.
  • To determine the influence of various ions on proteoheparan sulfate conformation and function.

Main Methods:

  • 23Na-NMR spectroscopy was employed to study proteoheparan sulfate.

Related Experiment Videos

  • Conformational changes of proteoheparan sulfate were analyzed under varying shear stress conditions.
  • Adsorption of proteoheparan sulfate onto hydrophobic surfaces was studied in the presence of different ions (Na+, Ca2+, K+, Mg2+).

    • Main Results:

    • Proteoheparan sulfate exists as a random coil with intramolecular hydrogen bonding under no flow.
    • Increased flow causes unfolding into a filamentous structure, releasing anionic binding sites for Na+.
    • Na+ binding to the unfolded proteoheparan sulfate triggers a vasodilatory signal transduction cascade.
    • Ca2+ modulated adsorption by altering conformation, while Na+ concentration primarily determined adsorption levels.

    Conclusions:

    • Proteoheparan sulfate functions as a shear stress-dependent "flow sensor" in endothelial cells.
    • Na+ ions act as a "first messenger" in the flow-dependent vasodilation pathway.
    • The conformational flexibility of proteoheparan sulfate is critical for its sensing capabilities and ion binding.