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Endothelial Zmiz1 modulates physiological and pathophysiological angiogenesis during retinal development.

Nehal R Patel1, K C Rajan1, Mark Y Chiang2

  • 1Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, United States.

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|July 15, 2024
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Summary

Zmiz1, a transcription cofactor, is essential for blood vessel formation. Its absence impairs embryonic development, retinal angiogenesis, and pathological angiogenesis in models of retinopathy.

Keywords:
Zmiz1angiogenesisco-factorretinopathytranscription

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Area of Science:

  • Vascular Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Angiogenesis is regulated by transcription factors, but the role of cofactors is less understood.
  • Zmiz1 is a transcription cofactor with an unknown role in endothelial cells.

Purpose of the Study:

  • To investigate the role of Zmiz1 in endothelial cells during physiological and pathological angiogenesis.

Main Methods:

  • Endothelial cell-specific deletion of Zmiz1 in mice during embryogenesis and postnatally.
  • Oxygen-induced retinopathy (OIR) model in mice.
  • Fibrin bead assay.
  • In vitro and in vivo migration assays.
  • Gene expression analysis.

Main Results:

  • Endothelial Zmiz1 deletion caused embryonic lethality due to vascular defects.
  • Postnatal Zmiz1 ablation impaired retinal angiogenesis, reducing vascular outgrowth and density.
  • Zmiz1 deficiency reduced vascular sprouting and endothelial cell migration, downregulating tip-cell genes.
  • Zmiz1 is critical for revascularization in the OIR model.

Conclusions:

  • Endothelial Zmiz1 is critical for embryonic vascular development, postnatal retinal angiogenesis, and pathological angiogenesis.
  • Zmiz1 regulates endothelial cell migration and tip-cell gene expression.
  • Zmiz1 plays a vital role in physiological and pathological angiogenesis.