Cardiovascular & Metabolic Peptides
Cardiovascular and metabolic peptides regulate heart function, blood pressure, vascular tone, and systemic metabolic homeostasis. This category includes endogenous cardiac hormones used as clinical biomarkers as well as emerging therapeutic targets.
Overview
Cardiovascular peptides are endogenous molecules that regulate the heart, vasculature, and fluid homeostasis. Many were discovered through basic cardiac physiology research and have since become critical clinical biomarkers and therapeutic targets.
Natriuretic peptides — Atrial Natriuretic Peptide (ANP) and B-type Natriuretic Peptide (BNP) — are released by cardiac muscle in response to wall stress. They promote diuresis, natriuresis, and vasodilation, acting as the heart's own protective system against volume overload. BNP (and its precursor NT-proBNP) is now a gold-standard biomarker for heart failure diagnosis.
Angiotensin 1-7, formed from angiotensin II by the ACE2 enzyme, represents the counter-regulatory arm of the renin-angiotensin system. It opposes the vasoconstrictive, pro-inflammatory effects of angiotensin II and has become a significant research target for hypertension, heart failure, and metabolic syndrome.
Key Compounds
Atrial Natriuretic Peptide (ANP)
Cardiac hormoneReleased by atrial cardiomyocytes in response to stretch. Promotes diuresis, natriuresis, and vasodilation. Key regulator of blood pressure and extracellular fluid volume.
BNP / NT-proBNP
Clinical biomarkerVentricular-derived natriuretic peptide. FDA-approved biomarker for heart failure diagnosis, prognosis, and therapy monitoring. Synthetic BNP (nesiritide) used therapeutically.
Angiotensin 1-7
RAS peptideCounter-regulatory peptide of the renin-angiotensin system, formed by ACE2 cleavage of angiotensin II. Vasodilatory, anti-fibrotic, anti-inflammatory. Studied for hypertension and metabolic syndrome.
Apelin
VasoactiveEndogenous ligand of the APJ receptor. Inotropic cardiac peptide that reduces blood pressure, improves cardiac output, and has been studied in heart failure and pulmonary arterial hypertension.
Glucagon
Pancreatic hormonePancreatic alpha-cell peptide that raises blood glucose, promotes hepatic glycogenolysis, and in pharmacological doses has positive inotropic cardiac effects. Studied in beta-blocker overdose management.
Mechanism of Action
Natriuretic Receptor Activation
ANP and BNP bind guanylyl cyclase-coupled receptors (NPR-A), increasing intracellular cGMP and promoting renal sodium excretion, vasodilation, and suppression of the renin-aldosterone axis.
ACE2/Angiotensin 1-7/Mas Axis
Angiotensin 1-7 acts on the Mas receptor to oppose angiotensin II effects: vasodilation, reduced inflammation, improved endothelial function, and anti-fibrotic signalling.
APJ Receptor Signalling
Apelin activates the APJ G-protein coupled receptor, enhancing cardiac contractility and reducing peripheral vascular resistance through NO-independent and PI3K/Akt pathways.
cGMP-Mediated Vasodilation
Multiple cardiovascular peptides elevate vascular smooth muscle cGMP levels, activating protein kinase G to induce relaxation and reduce blood pressure.
Research Applications
Heart Failure Research
Natriuretic peptides as diagnostic biomarkers and therapeutic targets in acute and chronic heart failure.
Hypertension Studies
Investigating ACE2/Ang 1-7 axis and natriuretic peptide pathways as antihypertensive strategies.
Metabolic Syndrome Research
Cardiovascular-metabolic intersection: studying how vasoactive peptides influence insulin sensitivity and lipid metabolism.
Biomarker Development
Validating cardiac peptides as diagnostic and prognostic biomarkers for cardiovascular risk stratification.
Frequently Asked Questions
Why is BNP used as a diagnostic marker for heart failure?
What is the ACE2/Angiotensin 1-7 axis and why is it important?
How does Apelin improve cardiac function in heart failure?
What is glucagon's role beyond raising blood sugar?
Research Information Only
This content is provided for educational and informational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendations. Always consult a qualified healthcare professional before making any health-related decisions.