Intensive Care Medicine

, Volume 34, Issue 4, pp 610–618

The role of proteoglycans in pulmonaryedema development

Mini Series: Basic research-related topics in ICM

Abstract

Pulmonary gas exchange critically depends upon the hydration state and the thinness of the interstitial tissue layer within the alveolo-capillary membrane. In the interstitium, fluid freely moving within the fibrous extracellular matrix (ECM) equilibrates with water chemically bound to hyaluronic acid and proteoglycans (PGs). The dynamic equilibrium between these two phases is set and maintained by the transendothelial fluid and solutes exchanges, by the convective outflows into the lymphatic system, and by the mechanical and hydrophilic properties of the solid elements of the ECM. The fibrous ECM components, in particular the chondroitin sulfate proteoglycan (CS-PG) and the heparan-sulfate proteoglycan (HS-PG) families, play a major role in the maintenance of tissue fluid homeostasis. In fact, they provide: (a) a perivascular and interstitial highly restrictive sieve with respect to plasma proteins, thus modulating both interstitial protein concentration and transendothelial fluid filtration; (b) a mechanical support to lymphatic vessels sustaining and modulating their draining function, and (c) a rigid three-dimensional low-compliant scaffold opposing fluid accumulation into the interstitial space. Fragmentation of PG induced by increased plasma volume, by degradation through proteolytic or inflammatory agents, by exposure to inspiratory gas mixture with modified oxygen fraction, or by increased tissue strain/stress invariably results in the progressive loosening of PG intermolecular bonds with other ECM components. The loss of the PGs regulatory functions compromises the protective role of the tissue solid matrix progressively leading to interstitial and eventually severe lung edema.

Keywords

Interstitial tissuematrix Proteoglycans Interstitial pressure Tissue safety factor Tissue compliance Thoracic lymphatic system 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Daniela Negrini
    • 1
  • Alberto Passi
    • 1
  • Andrea Moriondo
    • 1
  1. 1.Departmentof Experimental and Clinical Biomedical SciencesUniversity of InsubriaVareseItaly

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