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Modulation of vascular cell function by bim expression.

Margaret E Morrison1, Tammy L Palenski, Nasim Jamali

  • 1Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, H4/444 CSC, Madison, WI 53792-4108, USA.

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The proapoptotic protein Bim influences vascular cell function. Its absence impacts endothelial cell and pericyte proliferation, migration, and extracellular matrix production, affecting vascular development.

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Area of Science:

  • Vascular Biology
  • Cellular Biology
  • Molecular Biology

Background:

  • Apoptosis of vascular cells contributes to diseases involving vascular rarefaction.
  • Bim, a proapoptotic protein, regulates apoptosis and cellular functions like migration and ECM expression.
  • Endothelial cells and pericytes have distinct roles in vascular formation and function.

Purpose of the Study:

  • To investigate the cell-autonomous effects of Bim deficiency on retinal endothelial cells and pericytes.
  • To elucidate the specific impacts of Bim on vascular cell functions including proliferation, migration, adhesion, and ECM production.

Main Methods:

  • Utilized endothelial cells and pericytes from Bim-deficient (Bim(-/-)) mice.
  • Assessed proliferation, migration, adhesion, ECM production, VEGF expression, eNOS expression, and nitric oxide production.
  • Performed co-culturing experiments to evaluate capillary morphogenesis.

Main Results:

  • Bim(-/-) endothelial cells showed increased ECM production, proliferation, migration, adhesion, and VEGF, but decreased eNOS and nitric oxide.
  • Bim(-/-) pericytes exhibited decreased proliferation but increased migration, adhesion, and VEGF expression.
  • Co-culturing Bim(-/-) pericytes with endothelial cells impaired capillary morphogenesis.

Conclusions:

  • Bim plays a critical role in regulating endothelial cell and pericyte function independently.
  • Cell-autonomous mechanisms involving Bim are crucial for modulating vascular function and development.
  • Findings highlight the intricate regulatory roles of Bim in vascular health and disease pathogenesis.