Cablin: A novel protein of the capillary basal lamina

Audra J. Charron, Weimin Xu, Robert L. Bacallao, Angela Wandinger-Ness

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The microvascular wall is remarkably simple, consisting only of the endothelial lining, subjacent basal lamina, and underlying periendothelial cells. This study describes the characterization of a novel microvascular protein. This 80,000-molecular weight protein was predominantly associated with electron-lucent amorphous material in capillary basal laminae and therefore termed cablin (protein of the capillary basal lamina). Consistent with its immunolocalization to the microvasculature, cablin was synthesized and secreted by cultured endothelial cells and vascular smooth muscle cells. Furthermore, cablin expression was induced during neovascularization. The predicted amino acid sequence of cablin revealed a prevalence of polar amino acids. Accounting for the low yet significant homology to several α-helical proteins, these residues were best accommodated by secondary structure predictions that aligned the molecule into two large α-helical domains. The presence of the integrin-binding RGD tripeptide and a putative elastin- binding sequence suggest that this rodlike molecule is suited to cross-link cells and matrix constituents. In this capacity it could contribute to the mechanical strength or the angiogenic potential of the microvasculature.

Original languageEnglish (US)
Pages (from-to)H1985-H1996
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume277
Issue number5 46-5
StatePublished - Nov 1 1999

Keywords

  • Endothelial cell
  • Extracellular matrix
  • Microvascular
  • Vascular smooth muscle

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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