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Vol. 52, Issue 4, 639-672, December 2000

Signal Transduction Mechanisms Mediating the Physiological and Pathophysiological Actions of Angiotensin II in Vascular Smooth Muscle Cells

Rhian M. Touyz1 and Ernesto L. Schiffrin

Medical Research Council of Canada Multidisciplinary Research Group on Hypertension, Clinical Research Institute of Montreal, University of Montreal, Quebec, Canada

I. Introduction
II. Physiological Actions of Angiotensin II in Vascular Smooth Muscle Cells
    A. The Renin Angiotensin System---Production of Angiotensin II
    B. Angiotensin Receptors
    C. Vascular Actions of Angiotensin II
    D. Angiotensin II-Dependent Signaling Pathways
    E. Immediate Signaling Events Stimulated by Angiotensin II
        1. Stimulation of Phospholipase C and Phosphatidylinositol Hydrolysis.
        2. Increased Intracellular Free Calcium Concentration.
        3. Activation of Protein Kinase C.
        4. Stimulation of Na+/H+ Exchange.
        5. Angiotensin II Increases Intracellular Free Concentrations of Na+ and Decreases Intracellular Free Concentrations of Mg2+.
        6. Activation of Src Family Kinases.
    F. Early Signaling Events Mediated by Angiotensin II
        1. Activation of Tyrosine Kinases.
            a. Janus family kinases.
            b. Focal adhesion kinase and proline-rich tyrosine kinase 2.
            c. p130Cas.
            d. Phosphatidylinositol 3-kinase.
        2. Mitogen-Activated Protein Kinase Pathways.
            a. Upstream events.
            b. Downstream events.
            c. Angiotensin II and the mitogen-activated protein kinase pathway in cardiovascular cells.
        3. Activation of Phospholipase A2 and Arachidonic Acid Metabolism.
        4. Phospholipase D activation.
        5. Angiotensin II Effects on Cyclic Nucleotides.
    G. Long-Term Effects Mediated by Angiotensin II
        1. Generation of Reactive Oxygen Species.
        2. Angiotensin II-Induced Expression of Proto-Oncogenes and Growth Factors.
    H. Why the Special Role for Angiotensin II Signaling in Vascular Smooth Muscle Cells?
II. Altered Angiotensin II Signaling in Vascular Smooth Muscle Cells in Cardiovascular Diseases---Special Reference to Hypertension
    A. Introduction
    B. Vascular Changes
    C. Vascular Angiotensin Receptors
    D. Short-Term Signaling Events
        1. Angiotensin II Stimulation of the Phospholipase C-IP3-Diacylglycerol Pathway Is Augmented.
        2. Angiotensin II-Stimulated Effects on Vascular [Mg2+]i and [Na+]i.
        3. Vascular Eicosanoids, Angiotensin II, and Hypertension.
        4. Angiotensin II Increases Activity of Phospholipase D.
        5. Cyclic Nucleotides and Angiotensin II.
    E. Long-Term Signaling Events
        1. Angiotensin II-Induced Generation of Reactive Oxygen Species.
        2. Angiotensin II, Tyrosine Kinases, and Hypertension.
        3. Angiotensin II-Mediated Mitogen-Activated Protein Kinase Signaling Is Increased.
        4. Indirect Effects of Angiotensin II on the Vasculature.
    F. Mechanisms Underlying Enhanced Angiotensin II Vascular Responsiveness
IV. Conclusions
Acknowledgment
References

Until recently, the signaling events elicited in vascular smooth muscle cells by angiotensin II (Ang II) were considered to be rapid, short-lived, and divided into separate linear pathways, where intracellular targets of the phospholipase C-diacylglycerol-Ca2+ axis were distinct from those of the tyrosine kinase- and mitogen-activated protein kinase- dependent pathways. However, these major intracellular signaling cascades do not function independently and are actively engaged in cross-talk. Downstream signals from the Ang II-bound receptors converge to elicit complex and multiple responses. The exact adapter proteins or "go-between" molecules that link the multiple intracellular pathways await clarification. Ang II induces a multitude of actions in various tissues, and the signaling events following occupancy and activation of angiotensin receptors are tightly controlled and extremely complex. Alterations of these highly regulated signaling pathways in vascular smooth cells may be pivotal in structural and functional abnormalities that underlie vascular pathological processes in cardiovascular diseases such as hypertension, atherosclerosis, and post-interventional restenosis.


1 Address for correspondence: R. M. Touyz, M.D., Ph.D., Clinical Research Institute of Montreal, 110 Pine Ave. West, Montreal, Quebec H2W 1R7 Canada. E-mail: touyzr{at}ircm.qc.ca


0031-6997/00/5204-0639$03.00/0
PHARMACOLOGICAL REVIEWS
Copyright © 2000 by The American Society for Pharmacology and Experimental Therapeutics



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[Abstract] [Full Text] [PDF]


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R. M Touyz
Intracellular mechanisms involved in vascular remodelling of resistance arteries in hypertension: role of angiotensin II
Exp Physiol, July 1, 2005; 90(4): 449 - 455.
[Abstract] [Full Text] [PDF]