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Basic fibroblast growth factor-induced endothelial proliferation and NO synthesis involves inward rectifier K+
Wolfram Scharbrodt1, Christoph Rüdiger Wolfram Kuhlmann, Yongijan Wu
1Department of Cardiology and Angiology, Justus-Liebig-University of Giessen, Germany.
Summary
Basic fibroblast growth factor (bFGF) increases inward rectifier K+ currents (K(ir)) in endothelial cells. This modulation is crucial for bFGF-stimulated cell proliferation and nitric oxide (NO) production.
Area of Science:
- Endothelial cell physiology
- Ion channel function
- Molecular signaling pathways
Background:
- Inward rectifier K+ currents (K(ir)) are critical for regulating endothelial cell resting membrane potential.
- K(ir) influences Ca2+-dependent processes including cell growth and vasoactive agent synthesis.
- Basic fibroblast growth factor (bFGF) is a known vasodilator and angiogenic factor.
Purpose of the Study:
- To investigate the effect of bFGF on K(ir) in endothelial cells.
- To determine the role of K(ir) in bFGF-induced endothelial cell proliferation.
- To assess the involvement of K(ir) in bFGF-mediated nitric oxide (NO) formation.
Main Methods:
- Patch-clamp technique to measure K(ir) in human umbilical cord vein endothelial cells (HUVEC).
- Barium as a dose-dependent blocker of K(ir).
- Assessment of HUVEC proliferation and NO production (cGMP levels) under bFGF stimulation with and without barium.
Main Results:
- Characteristic K(ir) were identified in HUVEC, inhibited by barium.
- bFGF significantly increased K(ir), an effect blocked by barium.
- bFGF-induced HUVEC proliferation and NO production were significantly inhibited by barium.
Conclusions:
- Modulation of K(ir) is a key mechanism underlying bFGF's effects on endothelial cells.
- K(ir) channels are essential for bFGF-mediated endothelial cell growth.
- K(ir) plays a significant role in bFGF-induced nitric oxide formation.