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Pathway Description
Perindopril ACE Inhibitor Action Pathway
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Drug Action
Created: 2021-01-12
Last Updated: 2023-10-25
Perindopril is angiotensin-converting enzyme (ACE) inhibitor for the conversion of angiotensin I into angiotensin II. Angiotensin II is a critical circulating peptide hormone that has powerful vasoconstrictive effects and increases blood pressure. Perindopril is used to treat hypertension, high blood pressure, congestive heart failure, and chronic renal failure as it decreases blood pressure. Perindopril is converted into perindoprilat through the liver after being ingested which travels in the blood to inhibit ACE which is from the lungs. Angiotensin has many vasoconstrictive effects by binding to angiotensin II type 1 receptor (AT1) in blood vessels, kidneys, hypothalamus, and posterior pituitary. In blood vessels, AT1 receptors cause vasoconstriction in the tunica media layer of smooth muscle surrounding blood vessels increasing blood pressure. Less angiotensin II that is circulating lowers the constriction of these blood vessels. AT1 receptors in the kidney are responsible for the production of aldosterone which increases salt and water retention which increases blood volume. Less angiotensin II reduces aldosterone production allowing water retention to not increase. AT1 receptors in the hypothalamus are on astrocytes which inhibit the excitatory amino acid transporter 3 from up-taking glutamate back into astrocytes. Glutamate is responsible for the activation of NMDA receptors on paraventricular nucleus neurons (PVN neurons) that lead to thirst sensation. Since angiotensin II levels are lowered, the inhibition of the uptake transporter is not limited decreasing the amount of glutamate activating NMDA on PVN neurons that make the individual crave drinking less. This lowers the blood volume as well. Lastly, the AT1 receptors on posterior pituitary gland are responsible for the release of vasopressin. Vasopressin is an anti-diuretic hormone that cases water reabsorption in the kidney as well as causing smooth muscle contraction in blood vessels increasing blood pressure. Less angiotensin II activating vasopressin release inhibits blood pressure from increasing. Overall, Perindopril inhibits the conversion of angiotensin I into angiotensin II, a powerful vasoconstrictor and mediator of high blood pressure so decreasing levels of angiotensin will help reduce blood pressure from climbing in individuals.
References
Perindopril ACE Inhibitor Pathway References
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