Angiotensin (1-7) (; Molecular weight = 899.02 g/mol; H-
Asp
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** ''Cera ...
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Arg-
Val
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Tyr-
Ile
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* Isoleucine, an amino acid
* Another ...
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His-
Pro-OH) is an active
heptapeptide of the
renin–angiotensin system (RAS).
In 1988, Santos ''et al'' demonstrated that angiotensin (1-7) was a main product of the incubation of angiotensin I with brain micropunches and Schiavone ''et al'' reported the first biological effect of this heptapeptide.
Angiotensin (1-7) is a vasodilator agent affecting cardiovascular organs, such as heart, blood vessels and kidneys, with functions frequently opposed to those attributed to the major effector component of the RAS, angiotensin II (Ang II).
Synthesis
The polypeptide Ang I can be converted into Ang (1-7) by the actions of
neprilysin (NEP)
and
thimet oligopeptidase (TOP)
enzymes. Also, Ang II can be
hydrolyzed
Hydrolysis (; ) is any chemical reaction in which a molecule of water breaks one or more chemical bonds. The term is used broadly for substitution, elimination, and solvation reactions in which water is the nucleophile.
Biological hydrolysis ...
into Ang (1-7) through the actions of
angiotensin-converting enzyme 2 (ACE2). Ang (1-7) binds and activates the
G-protein coupled receptor Mas receptor
leading to opposite effects of those of Ang II.
Possible pathways
* Action of
neprilysin on angiotensin I or angiotensin II.
* Action of
prolyl endopeptidase on
angiotensin I.
* Action of
ACE on angiotensin 1-9.
* Action of
neprilysin on angiotensin 1-9.
* Action of
ACE2 on
angiotensin II.
Effects
Ang (1-7) has been shown to have anti-oxidant and anti-inflammatory effects.
It helps protect cardiomyocytes of spontaneously hypertensive rats by increasing the expression of endothelial and neuronal nitric oxide synthase enzymes, augmenting production of nitric oxide.
Pharmacological interactions
Ang (1-7) contributes to the beneficial effects of ACE inhibitors and angiotensin II receptor type 1 antagonists.
References
{{Reflist
Peptides
Angiology
Endocrinology
Hypertension