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Angiotensin II: a double-edged sword in inflammation
Y Suzuki1, M Ruiz-Ortega, J Egido
1Renal and Vascular Research Laboratory, Fundación Jiménez Díaz, Madrid, Spain.
Journal of Nephrology
|December 29, 2000
Summary
Angiotensin II (Ang II) is more than a hormone; it modulates inflammation by increasing vascular permeability and cell recruitment. The renin-angiotensin system (RAS) regulates vascular inflammation, though its activation can lead to imperfect tissue repair.
Area of Science:
- Cardiovascular Physiology
- Immunology
- Renal Pathophysiology
Background:
- Angiotensin II (Ang II) is recognized for hemodynamic effects and as a growth factor in diseases like renal disease.
- Emerging research highlights Ang II's role as a proinflammatory modulator.
Purpose of the Study:
- To review and clarify the multifaceted properties of Ang II.
- To discuss Ang II's relationship with inflammation and its underlying mechanisms.
- To explore the role of the renin-angiotensin system (RAS) in vascular and immune-induced inflammation.
Main Methods:
- Literature review and synthesis of existing clinical and basic research.
- Analysis of Ang II's effects on vascular permeability, cell recruitment, and tissue repair.
- Discussion of mechanisms involving nuclear transcription factors and inflammatory mediators.
Main Results:
- Ang II initiates inflammation by increasing vascular permeability via prostaglandins and VEGF/VPF.
- Ang II promotes inflammatory cell recruitment by activating immune cells and regulating adhesion molecules/chemokines.
- Ang II influences tissue repair through regulation of cell growth and matrix synthesis.
Conclusions:
- The renin-angiotensin system (RAS) acts as a vascular inflammatory regulator.
- RAS activation can contribute to immunologically-induced inflammation.
- While involved in repair, RAS activation often results in suboptimal outcomes like "overhealing" due to inherent system imperfections.