CDB15:0000382 CCN2 — ITGA5

Experimentally validated in Rat; Orthology-inferred in Human, Mouse, Frog, Zebrafish, Chicken, Macaque, Pig, Dog, Cow, Chimp, Horse, Marmoset, Sheep

Title

Journal:; Year Published:

Abstract

Connective tissue growth factor with a novel fibronectin binding site promotes cell adhesion and migration during rat oval cell activation.

Hepatology, 2008; PubMed, Rattus norvegicus Ccn2 — Rattus norvegicus Itga5
ABSTRACT: Oval cell activation, as part of the regenerative process after liver injury, involves considerable cell-matrix interaction. The matricellular protein, connective tissue growth factor (CTGF), has been shown to be critical for oval cell activation during liver regeneration following N-2-acetylaminofluorene/partial hepatectomy. To understand the mode of action of CTGF during this process, N-terminal CTGF was used as bait to screen a yeast two-hybrid complementary DNA library specific for regenerating livers with massive oval cell presence. Fibronectin (FN), a prominent component of hepatic extracellular matrix (ECM), was found to specifically bind to a new site on CTGF. In addition to module IV, this study showed that module I of CTGF was sufficient for binding to FN in both solid-phase in vitro binding assays and immunoprecipitation. Immunofluorescent staining revealed a dynamic ECM remodeling characterized by an FN-concentrated provisional matrix during oval cell-aided liver regeneration. Abundant CTGF protein was colocalized with FN in the provisional matrix. When expressed as recombinant proteins and immobilized on plastic surfaces, modules I and IV of CTGF were selectively adhesive to thymus cell antigen 1-positive (Thy1(+)) oval cells, stellate cells, and sinusoidal endothelial cells but not to hepatocytes. The adhesion of these two modules on Thy1(+) oval cells required heparan sulfate proteoglycan and integrin alpha(5)beta(1). Recombinant CTGF promoted an integrin alpha(5)beta(1)-dependent migration but not proliferation on Thy1(+) oval cells.
Basic Information on CCN2
Ligand Name: cellular communication network factor 2
Other Symbols: CTGF, IGFBP8
Ligand Location: secreted based on hpa, perplexity, uniprot
HGNC Gene Symbol Report: CCN2
GeneCards: CCN2
Basic Information on ITGA5
Receptor Name: integrin subunit alpha 5
Other Symbols: FNRA, CD49e
Receptor Location: cell membrane based on perplexity, uniprot
HGNC Gene Symbol Report: ITGA5
GeneCards: ITGA5
HGNC Gene Group: CD molecules, Integrins