SPARC, a matricellular protein: at the crossroads of cell-matrix

Rolf A. Brekken, E. Helene Sage

Research output: Contribution to journalArticle

187 Citations (Scopus)

Abstract

SPARC is a multifunctional glycoprotein that belongs to the matricellular group of proteins. It modulates cellular interaction with the extracellular matrix (ECM) by its binding to structural matrix proteins, such as collagen and vitronectin, and by its abrogation of focal adhesions, features contributing to a counteradhesive effect on cells. SPARC inhibits cellular proliferation by an arrest of cells in the G1 phase of the cell cycle. It also regulates the activity of growth factors, such as platelet-derived growth factor (PDGF), fibroblast growth factor (FGF)-2, and vascular endothelial growth factor (VEGF). The expression of SPARC in adult animals is limited largely to remodeling tissue, such as bone, gut mucosa, and healing wounds, and it is prominent in tumors and in disorders associated with fibrosis. The crystal structure of two of the three domains of the protein has revealed a novel follistatin-like module and an extracellular calcium-binding (EC) module containing two EF-hand motifs. The follistatin-like module and the EC module are shared by at least four other proteins that comprise a family of SPARC-related genes. Targeted disruption of the SPARC locus in mice has shown that SPARC is important for lens transparency, as SPARC-null mice develop cataracts shortly after birth. SPARC is a prototypical matricellular protein that functions to regulate cell-matrix interactions and thereby influences many important physiological and pathological processes. Copyright (C) 2000 Elsevier Science B.V./International Society of Matrix Biology.

Original languageEnglish (US)
Pages (from-to)569-580
Number of pages12
JournalMatrix Biology
Volume19
Issue number7
DOIs
StatePublished - 2000

Fingerprint

Follistatin
Proteins
Physiological Phenomena
Calcium
EF Hand Motifs
Vitronectin
Focal Adhesions
Platelet-Derived Growth Factor
G1 Phase
Fibroblast Growth Factor 2
Pathologic Processes
Cell Communication
Wound Healing
Cataract
Vascular Endothelial Growth Factor A
Lenses
Extracellular Matrix
Intercellular Signaling Peptides and Proteins
Glycoproteins
Cell Cycle

Keywords

  • Cell-matrix interaction
  • Matricellular
  • SPARC/osteonectin/BM-40

ASJC Scopus subject areas

  • Molecular Biology

Cite this

SPARC, a matricellular protein : at the crossroads of cell-matrix. / Brekken, Rolf A.; Sage, E. Helene.

In: Matrix Biology, Vol. 19, No. 7, 2000, p. 569-580.

Research output: Contribution to journalArticle

Brekken, Rolf A. ; Sage, E. Helene. / SPARC, a matricellular protein : at the crossroads of cell-matrix. In: Matrix Biology. 2000 ; Vol. 19, No. 7. pp. 569-580.
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