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Thrombospondin 2 modulates collagen fibrillogenesis and angiogenesis

P Bornstein1, T R Kyriakides, Z Yang

  • 1Department of Biochemistry, University of Washington, Seattle 98195, USA. bornsten@u.washington.edu

The Journal of Investigative Dermatology. Symposium Proceedings
|January 9, 2001
PubMed

Insights

Thrombospondin 2 (TSP2) deficiency causes connective tissue issues and increased blood vessel growth by affecting cell-matrix interactions. This impacts fibroblast adhesion and collagen structure, leading to skin and tendon abnormalities.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Developmental Biology

Background:

  • Thrombospondin 2 (TSP2) is a matricellular protein involved in regulating cell-matrix interactions.
  • TSP2-null mice exhibit connective tissue abnormalities and increased vascularity.

Purpose of the Study:

  • To elucidate the functional role of TSP2 in modulating cell-matrix interactions.
  • To investigate the mechanisms underlying connective tissue defects and increased angiogenesis in TSP2-null mice.

Main Methods:

  • Analysis of TSP2-null mouse phenotype, including connective tissue structure and vascular density.
  • In vitro studies of dermal fibroblast adhesion and matrix metalloproteinase 2 (MMP2) production.
  • Transmission electron microscopy of tendon tissues.
  • Modeling of tissue injury to assess angiogenesis.

Main Results:

  • TSP2 deficiency leads to structurally abnormal collagen fibrils due to defective fibroblast adhesion.
  • Increased production of MMP2 by TSP2-null fibroblasts contributes to collagen abnormalities.
  • Enhanced vascular density in TSP2-null mice is observed in various injury models.

Conclusions:

  • TSP2 functions as a matricellular regulator, influencing cell behavior through matrix modulation rather than direct matrix incorporation.
  • Defective cell-matrix interactions, particularly fibroblast adhesion and MMP2 activity, underlie the observed connective tissue defects.
  • Further research is needed to pinpoint the cellular origin of increased angiogenesis in TSP2-null mice.

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