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  • Title: Devil and angel in the renin-angiotensin system: ACE-angiotensin II-AT1 receptor axis vs. ACE2-angiotensin-(1-7)-Mas receptor axis.
    Author: Iwai M, Horiuchi M.
    Journal: Hypertens Res; 2009 Jul; 32(7):533-6. PubMed ID: 19461648.
    Abstract:
    Recent studies have established a new regulatory axis in the renin-angiotensin system (RAS). In this axis, angiotensin (Ang)-(1-7) is finally produced from Ang I or Ang II by the catalytic activity of angiotensin-converting enzyme 2 (ACE2). Ang-(1-7) shows actions different from those of AT(1) receptor stimulation, such as vasodilatation, natriuresis, anti-proliferation and an increase in the bradykinin-NO (nitric oxide) system. As the catalytic efficiency of ACE2 is approximately 400-fold higher with Ang II as a substrate than with Ang I, this axis is possibly acting as a counter-regulatory system against the ACE/Ang II/AT(1) receptor axis. The signaling pathway of the ACE2-Ang-(1-7) axis has not yet been totally and clearly understood. However, a recent report suggests that the Mas oncogene acts as a receptor for Ang-(1-7). Intracellular signaling through Mas is not clear yet. Several factors such as Akt phosphorylation, protein kinase C activation and mitogen-activated protein (MAP) kinase inhibition seem to be involved in this signaling pathway. Further investigations are needed to clarify the regulation and mechanism of action of ACE2 and Ang-(1-7). However, this second axis through ACE2 and Ang-(1-7) in RAS can be an important target for the therapy of cardiovascular and metabolic disorders.
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