Angiotensin-(1-7) is an endogenous ligand for the G protein-coupled receptor Mas.
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2003
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Resumo
The renin–angiotensin system plays a critical role in blood pressure
control and body fluid and electrolyte homeostasis. Besides angiotensin
(Ang) II, other Ang peptides, such as Ang III [Ang-(2–8)],
Ang IV [Ang-(3–8)], and Ang-(1–7) may also have important biological
activities. Ang-(1–7) has become an angiotensin of interest
in the past few years, because its cardiovascular and baroreflex
actions counteract those of Ang II. Unique angiotensin-binding
sites specific for this heptapeptide and studies with a selective
Ang-(1–7) antagonist indicated the existence of a distinct Ang-(1–7)
receptor. We demonstrate that genetic deletion of the G proteincoupled
receptor encoded by the Mas protooncogene abolishes the
binding of Ang-(1–7) to mouse kidneys. Accordingly, Mas-deficient
mice completely lack the antidiuretic action of Ang-(1–7) after an
acute water load. Ang-(1–7) binds to Mas-transfected cells and
elicits arachidonic acid release. Furthermore, Mas-deficient aortas
lose their Ang-(1–7)-induced relaxation response. Collectively,
these findings identify Mas as a functional receptor for Ang-(1–7)
and provide a clear molecular basis for the physiological actions of
this biologically active peptide.
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Binding, Mas protooncogene, Renin angiotensin system
Citação
SANTOS, R. A. S. et al. Angiotensin-(1-7) is an endogenous ligand for the G protein-coupled receptor Mas. Proceedings National Academy Science, v. 100, n.14, p. 8258-8263, 2003. Disponível em: <http://www.pnas.org/content/100/14/8258.long>. Acesso em: 23 fev. 2017.