Connective tissue growth factor regulates retinal neovascularization through p53 protein-dependent transactivation of the matrix metalloproteinase (MMP)-2 gene

Hembindu Chintala, Haibo Liu, Rahul Parmar, Monika Kamalska, Yoon Ji Kim, David Lovett, Maria B. Grant, Brahim Chaqour

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Pathological angiogenesis in the retina is driven by dysregulation of hypoxia-driven stimuli that coordinate physiological vessel growth. How the various components of the neovascularization signaling network are integrated to yield pathological changes has not been defined. Connective tissue growth factor (CTGF/CCN2) is an inducible matricellular protein that plays a major role in fibroproliferative disorders. Here, we show that CTGF/CCN2 was dynamically expressed in the developing murine retinal vasculature and was abnormally increased and localized within neovascular tufts in the mouse eye with oxygen-induced retinopathy. Consistent with its propitious vascular localization, ectopic expression of the CTGF/CCN2 gene further accelerated neovascularization, whereas lentivirus-mediated loss-of-function or -expression of CTGF/CCN2 harnessed ischemia- induced neovessel outgrowth in oxygen-induced retinopathy mice. The neovascular effects of CTGF/CCN2 were mediated, at least in part, through increased expression and activity of matrix metalloproteinase (MMP)-2, which drives vascular remodeling through degradation of matrix and non matrix proteins, migration and invasion of endothelial cells, and formation of new vascular patterns. In cultured cells, CTGF/CCN2 activated the MMP-2 promoter through increased expression and tethering of the p53 transcription factor to a highly conserved p53-binding sequence within the MMP-2 promoter. Concordantly, the neovascular effects of CTGF/CCN2 were suppressed by p53 inhibition that culminated in reduced enrichment of the MMP-2 promoter with p53 and decreased MMP-2 gene expression. Our data identified new gene targets and downstream effectors of CTGF/CCN2 and provided the rational basis for targeting the p53 pathway to curtail the effects of CTGF/CCN2 on neovessel formation associated with ischemic retinopathy.

Original languageEnglish (US)
Pages (from-to)40570-40585
Number of pages16
JournalJournal of Biological Chemistry
Volume287
Issue number48
DOIs
StatePublished - Nov 23 2012
Externally publishedYes

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Retinal Neovascularization
Connective Tissue Growth Factor
Matrix Metalloproteinase 2
Transcriptional Activation
Genes
Proteins
Blood Vessels
Pathologic Neovascularization
Oxygen
Lentivirus
Endothelial cells
Gene expression
Retina
Cultured Cells
Transcription Factors
Ischemia
Endothelial Cells
Cells
Gene Expression
Degradation

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Connective tissue growth factor regulates retinal neovascularization through p53 protein-dependent transactivation of the matrix metalloproteinase (MMP)-2 gene. / Chintala, Hembindu; Liu, Haibo; Parmar, Rahul; Kamalska, Monika; Kim, Yoon Ji; Lovett, David; Grant, Maria B.; Chaqour, Brahim.

In: Journal of Biological Chemistry, Vol. 287, No. 48, 23.11.2012, p. 40570-40585.

Research output: Contribution to journalArticle

Chintala, Hembindu ; Liu, Haibo ; Parmar, Rahul ; Kamalska, Monika ; Kim, Yoon Ji ; Lovett, David ; Grant, Maria B. ; Chaqour, Brahim. / Connective tissue growth factor regulates retinal neovascularization through p53 protein-dependent transactivation of the matrix metalloproteinase (MMP)-2 gene. In: Journal of Biological Chemistry. 2012 ; Vol. 287, No. 48. pp. 40570-40585.
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