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Beta 3-adrenergic receptors regulate retinal endothelial cell migration and proliferation
Jena J Steinle1, George W Booz, Cynthia J Meininger
1Department of Medical Physiology, College of Medicine, The Texas A&M University System Health Science Center, Temple, Texas 76504, USA. jsteinle@tamu.edu
The Journal of Biological Chemistry
|April 3, 2003
Summary
Activation of beta3-adrenergic receptors on retinal cells promotes their migration and proliferation, suggesting a role in eye vascular disorders. Beta3 receptors are key to these angiogenic processes.
Area of Science:
- Ophthalmology
- Vascular Biology
- Pharmacology
Background:
- Sympathetic nerve activity is implicated in ocular vascular pathologies.
- Retinal endothelial cells are crucial for ocular vascular health and angiogenesis.
- Adrenergic receptors are known modulators of cellular functions, including vascular cell behavior.
Purpose of the Study:
- To investigate the role of beta3-adrenergic receptors in retinal endothelial cell function.
- To determine if beta3-adrenergic receptor activation influences retinal endothelial cell migration and proliferation, key markers of angiogenesis.
Main Methods:
- Cultured human retinal endothelial cells were used to study beta-adrenergic receptor expression.
- The specific beta3-adrenergic receptor agonist BRL37344 was used to assess its effects on cell migration and proliferation.
- Specific inhibitors for phosphatidylinositol 3-kinase (PI3K), MEK, Src, and matrix metalloproteinases (MMPs) 2 and 9 were employed to elucidate signaling pathways.
Main Results:
- Beta3-adrenergic receptors were detected on cultured human retinal endothelial cells.
- Activation of beta3-adrenergic receptors with BRL37344 significantly promoted cell migration and proliferation.
- The pro-migratory and pro-proliferative effects of BRL37344 were dependent on PI3K, MEK, Src, and MMPs signaling pathways.
Conclusions:
- Beta3-adrenergic receptors are expressed on retinal endothelial cells and mediate their migration and proliferation.
- These findings support the hypothesis that beta3-adrenergic receptors play a significant role in the angiogenic potential of retinal endothelial cells.
- Targeting beta3-adrenergic receptors may offer a novel therapeutic strategy for managing ocular vascular disorders.