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Related Experiment Videos

Angiotensin II and retinal pericytes migration.

J A Nadal1, G M Scicli, L A Carbini

  • 1Eye Care Services Research, Henry Ford Health Systems, Detroit, Michigan 48202, USA.

Biochemical and Biophysical Research Communications
|December 22, 1999
PubMed
Summary

Angiotensin II (Ang II) stimulates retina pericyte migration via AT(1) receptors, acting as a chemotactic factor. This finding may explain Ang II

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Area of Science:

  • Ophthalmology
  • Cardiovascular Biology
  • Cell Biology

Background:

  • Neovascularization in the retina is regulated by Angiotensin II (Ang II).
  • Retinal pericyte migration is crucial for regulating angiogenesis.

Purpose of the Study:

  • To investigate the hypothesis that Ang II stimulates retina pericyte migration.
  • To elucidate the receptor pathways involved in Ang II-mediated pericyte migration.

Main Methods:

  • Modified Boyden chambers and collagen IV-coated membranes were used to assess pericyte migration.
  • Checkerboard assays were employed to differentiate between chemotaxis and chemokinesis.
  • AT(1) and AT(2) receptor antagonists (Losartan and PD123319) were utilized to investigate receptor involvement.

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Main Results:

  • Angiotensin II significantly stimulated bovine retinal pericyte migration by 54.8 +/- 9.7% (p < 0.001).
  • The migratory effect of Ang II was blocked by the AT(1) receptor antagonist Losartan.
  • Ang II induced chemotaxis, a directed migration, rather than chemokinesis, a nondirected migration.

Conclusions:

  • Angiotensin II, acting through its AT(1) receptor, functions as a chemotactic factor for retinal microvascular pericytes.
  • This mechanism may contribute to Ang II-driven regulation of retinal neovascularization.
  • The findings highlight a novel role for the renin-angiotensin system in retinal vascular dynamics.