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Angiotensin II AT2 receptor subtype: an uprising frontier in cardiovascular disease?
Massimo Volpe1, Beatrice Musumeci, Paola De Paolis
1Cattedra di Cardiologia, II Facoltà di Medicina, Dipartimento di Medicina Sperimentale e Patologia, Università La Sapienza, Rome, Italy. volpema@uniroma1.it
Abstract:
The renin-angiotensin system (RAS) plays a pivotal role in the regulation of fluid, electrolyte balance and blood pressure, and is a modulator of cellular growth and proliferation. Biological actions of RAS are linked to the binding of the effector molecule, angiotensin II (AngII), to specific membrane receptors, mostly the AT1 subtype and, to a lesser extent, other subtypes. Following the identification and characterization of the AT2 subtype receptor, it has been proposed that a complex interaction between AngII and its receptors may play an important role in the effects of RAS. In this paper current information on AngII subtype receptors--their structure, regulation and intracellular signalling--are reviewed, with a particular emphasis on the potential relevance for cardiovascular pathophysiology. In addition, we discuss modulation of expression of the AT2 receptor and its interaction with the AT1 receptor subtype, as well as the potential effects of this receptor on blood pressure regulation. A better understanding of the integrated effects of the AngII subtype receptors may help to elucidate the function of the RAS, as well as their participation in the mechanisms of cardiovascular disease and attendant therapeutic implications.
Insights
The renin-angiotensin system (RAS) regulates blood pressure and fluid balance. Angiotensin II (AngII) receptors, particularly AT1 and AT2, are key to RAS functions and cardiovascular disease.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Molecular Biology
Background:
- The renin-angiotensin system (RAS) is crucial for regulating blood pressure, fluid balance, and cellular processes.
- Angiotensin II (AngII) exerts its effects by binding to specific membrane receptors, primarily AT1 and AT2 subtypes.
- The interplay between AngII and its receptors is increasingly recognized for its role in cardiovascular pathophysiology.
Purpose of the Study:
- To review current knowledge on AngII subtype receptors, including their structure, regulation, and signaling pathways.
- To emphasize the relevance of AngII subtype receptors in cardiovascular pathophysiology.
- To discuss the modulation and interaction of AT2 receptors with AT1 receptors and their impact on blood pressure regulation.
Main Methods:
- Literature review of existing research on AngII subtype receptors.
- Analysis of data concerning receptor structure, gene expression, and intracellular signaling.
- Synthesis of information on the functional roles and interactions of AT1 and AT2 receptors.
Main Results:
- AngII subtype receptors, particularly AT1 and AT2, exhibit distinct structures, regulatory mechanisms, and signaling pathways.
- The AT2 receptor's expression can be modulated, and it interacts with the AT1 receptor.
- These interactions and signaling pathways have significant implications for cardiovascular function and disease.
Conclusions:
- A comprehensive understanding of AngII subtype receptor interactions is essential for elucidating RAS functions.
- These receptors play a critical role in the mechanisms underlying cardiovascular diseases.
- Targeting AngII subtype receptors offers potential therapeutic strategies for cardiovascular conditions.