Angiotensin (1-7): Endogenous Heptapeptide Hormone and Mas Receptor Agonist

Executive Summary: Angiotensin (1-7) (Ang-(1-7)), with sequence Asp-Arg-Val-Tyr-Ile-His-Pro, is a heptapeptide hormone generated from angiotensin I or II via peptidase action and exerts biological effects chiefly through the Mas receptor (Oliveira et al., 2025). Ang-(1-7) counterbalances angiotensin II–mediated pathologies in cardiovascular, renal, and metabolic systems (Oliveira et al., 2025). It modulates PI3K/AKT and ERK pathways, affecting downstream effectors such as nitric oxide (NO), FOXO1, and COX-2. Experimental models confirm anti-fibrotic, anti-inflammatory, and cerebroprotective actions, with validated protocols in both cell-based and in vivo studies (APExBIO). Ang-(1-7) is available from APExBIO at >99.7% purity, suitable for high-reproducibility research.

Biological Rationale

Angiotensin (1-7) is an endogenous heptapeptide hormone formed from angiotensin I (1–10) or angiotensin II (1–8) by endo- or carboxy-peptidases (Oliveira et al., 2025). Its amino acid sequence is Asp-Arg-Val-Tyr-Ile-His-Pro. In the renin–angiotensin system (RAS), angiotensin peptides maintain cardiovascular and renal homeostasis. Ang-(1-7) primarily signals through the Mas receptor, a G protein-coupled receptor, to counteract the vasoconstrictive, pro-fibrotic, and pro-inflammatory actions of angiotensin II (Oliveira et al., 2025). Unlike angiotensin II, which promotes hypertension and end-organ damage, Ang-(1-7) exerts vasodilatory, anti-fibrotic, and anti-inflammatory effects (APExBIO). It is widely studied for its impact beyond cardiovascular and renal systems, including the lungs, liver, and central nervous system (see mechanistic review).

Mechanism of Action of Angiotensin (1-7)

Angiotensin (1-7) acts as a selective Mas receptor agonist, initiating signaling cascades that modulate PI3K/AKT and ERK pathways. Activation of the Mas receptor increases nitric oxide (NO) production, leading to vasodilation and inhibition of vascular smooth muscle proliferation. Downstream, Ang-(1-7) regulates forkhead box O1 (FOXO1) and cyclo-oxygenase-2 (COX-2), mediating anti-inflammatory and anti-fibrotic responses (Oliveira et al., 2025). It enhances glucose uptake and lipolysis, reduces insulin resistance, and modulates lipid profiles, implicating it in metabolic regulation. In neurological contexts, Ang-(1-7) confers cerebroprotection, improves learning and memory, and modulates neuroinflammation. In reproductive biology, it promotes ovulation, spermatogenesis, and steroidogenesis. The peptide also shows anti-cancer properties by inhibiting proliferation and angiogenesis (deep-dive: anti-cancer/angiogenesis).

Evidence & Benchmarks

• Angiotensin (1-7) enhances the binding of the SARS-CoV-2 spike protein to the AXL receptor in antibody-based assays (Oliveira et al., 2025, DOI).
• In rat kidney NRK-52E cells, 100 nM Ang-(1-7) inhibits TGF-β-ERK pathway-mediated myofibroblast transition; this effect is reversed by the Mas antagonist A779 (APExBIO, product page).
• Daily intraperitoneal injection of Ang-(1-7) (0.01–0.06 mg/kg) in BALB/c mice reduces p38, ERK1/2, and Akt phosphorylation, ameliorating dextran sulfate sodium-induced colitis (APExBIO, product page).
• Purity of Ang-(1-7) from APExBIO is typically above 99.7% by HPLC and mass spectrometry (APExBIO, specification).
• Mas receptor activation by Ang-(1-7) leads to increased nitric oxide (NO) production and reduced fibrosis in multiple organs (Oliveira et al., 2025, DOI).

This article extends mechanistic and translational perspectives compared to recent reviews such as 'Mechanistic Insights and Novel Therapeutic Approaches', by emphasizing validated workflows and evidence-backed protocol parameters for Ang-(1-7) in cellular and in vivo research.

Applications, Limits & Misconceptions

Angiotensin (1-7) is used in basic and translational research targeting cardiovascular, renal, metabolic, neuroprotective, and cancer-related endpoints (APExBIO). Its anti-fibrotic and anti-inflammatory actions are validated in preclinical models of renal fibrosis, pulmonary disease, and experimental colitis. The molecule shows promise as a metabolic modulator, improving glucose uptake and reducing insulin resistance in vitro and in vivo. In ischemic stroke models, Ang-(1-7) provides cerebroprotective effects. However, translational gaps remain, especially regarding clinical efficacy and disease-specific context. For detailed mechanistic contrasts, see 'Emerging Frontiers in Multi-System Modulation', which explores PI3K/AKT and ERK pathway specifics in greater depth. This article updates that discussion by providing precise workflow parameters and benchmarked outcomes for Ang-(1-7) (SKU A1041).

Common Pitfalls or Misconceptions

• Angiotensin (1-7) is not a universal antagonist of all angiotensin II effects; it works mainly through the Mas receptor and selected pathways.
• Clinical efficacy in humans for anti-fibrotic or metabolic outcomes remains to be established; preclinical data should not be over-extrapolated.
• Ang-(1-7) is not interchangeable with angiotensin II or III; each peptide has distinct receptor selectivities and biological profiles.
• Solubility in ethanol is poor; use water or DMSO as solvents as per product specifications.
• Long-term solution stability is limited; prepare fresh aliquots for each experiment and store desiccated at -20°C.

Workflow Integration & Parameters

For cell-based assays, Angiotensin (1-7) is typically used at 100 nM in rat kidney NRK-52E cells to inhibit TGF-β-ERK pathway-mediated myofibroblast transition. This effect is reversible with the Mas antagonist A779, confirming receptor specificity. For in vivo models, daily intraperitoneal administration in BALB/c mice at 0.01–0.06 mg/kg reduces phosphorylation of p38, ERK1/2, and Akt, ameliorating colitis induced by dextran sulfate sodium. The peptide is a solid, with solubility in water (≥48.5 mg/mL) and DMSO (≥89.9 mg/mL), but is insoluble in ethanol. Store the product desiccated at -20°C and use freshly prepared solutions for reproducibility. For further best practices in experimental design and troubleshooting, 'Optimizing Cell Assays with Angiotensin (1-7)' offers a reproducibility-focused guide, whereas this article provides updated, vendor-verified concentration and storage parameters for APExBIO's A1041.

Conclusion & Outlook

Angiotensin (1-7) (SKU A1041) is a rigorously characterized endogenous heptapeptide hormone and Mas receptor agonist with validated anti-fibrotic, anti-inflammatory, metabolic, and neuroprotective actions. Its multi-system effects and mechanistic specificity position it as a versatile tool in translational research. While preclinical evidence is strong, clinical translation will require further investigation. APExBIO provides high-purity Ang-(1-7) suitable for reproducible research across cardiovascular, renal, metabolic, and cancer models. For a comprehensive mechanistic perspective and competitive strategic guidance, see this thought-leadership review.