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Updated: May 19, 2026

Monitoring Functionality and Morphology of Vasculature Recruited by Factors Secreted by Fast-growing Tumor-generating Cells
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Published on: November 23, 2014

ROCK1 & 2 perform overlapping and unique roles in angiogenesis and angiosarcoma tumor progression.

J Montalvo1, C Spencer, A Hackathorn

  • 1Ghosh Science and Technology Center, Department of Biology, Worcester State University, Worcester, Massachusetts, USA.

Current Molecular Medicine
|September 1, 2012
PubMed
Summary

ROCK1 and ROCK2 (rho-associated coiled-coil kinases) are crucial for endothelial cell function and angiogenesis. Targeting these kinases may offer new therapeutic strategies for inhibiting tumor growth and related vascular diseases.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Serine/threonine protein kinases ROCK1 and ROCK2 are known regulators of angiogenesis.
  • Specific paralog roles in endothelial cell function remain largely undefined.

Purpose of the Study:

  • To elucidate the distinct and overlapping functions of ROCK1 and ROCK2 in endothelial cells.
  • To investigate the impact of ROCK paralog inhibition on angiogenesis and tumor formation.

Main Methods:

  • Endothelial cells were treated with shRNA to knock down ROCK1 or ROCK2.
  • In vitro assays assessed capillary network formation, cell migration, and polarization.
  • Western blotting analyzed cytoskeletal protein phosphorylation.
  • Microarray analysis examined global gene expression.
  • Xenograft angiosarcoma models were used to evaluate tumor formation.

Main Results:

  • ROCK1/2 knockdown disrupted endothelial cell capillary network formation, polarization, and migration.
  • Cytoskeletal dynamics were altered, with reduced actin expression and specific phosphorylation changes in ROCK2 knockdown cells.
  • Cell survival was enhanced, with reduced caspase cleavage.
  • ROCK paralogs uniquely and overlap-pingly controlled gene transcription, including VEGF-responsive genes.
  • Tumor formation in xenograft models was significantly reduced.

Conclusions:

  • ROCK1 and ROCK2 play critical, yet distinct, roles in endothelial cell function and angiogenesis.
  • ROCK signaling modulates cytoskeletal dynamics and overrides mitogen-activated transcription.
  • Targeting ROCK signaling presents a promising therapeutic strategy for anti-angiogenesis and cancer treatment.