[Sar1, Ile8]-Angiotensin II (TFA) is a peptide that has multiple effects on vascular smooth muscle, including contraction of normal arteries and hypertrophy or hyperplasia of cultured cells or diseased vessels.
[Sar1, Ile8]-Angiotensin II TFA is a synthetic peptide analog of the endogenous octapeptide hormone angiotensin II, distinguished by the substitution of sarcosine at position 1 and isoleucine at position 8. These specific amino acid modifications confer altered receptor binding properties and functional activity compared to the native peptide, making it a valuable tool in the study of the renin-angiotensin system (RAS). As a research-grade peptide, [Sar1, Ile8]-Angiotensin II TFA is widely utilized in biochemical and pharmacological investigations to dissect the mechanisms of angiotensin receptor signaling, peptide-receptor specificity, and downstream physiological responses. Its unique structural attributes enable researchers to probe the structure-activity relationships that govern peptide hormone function, providing critical insights into cardiovascular, renal, and neuroendocrine regulatory pathways.
Receptor Pharmacology: The modified peptide serves as a highly informative probe for angiotensin II receptor subtype characterization, particularly in distinguishing between AT1 and AT2 receptor-mediated responses. By substituting sarcosine and isoleucine at key positions, the analog exhibits altered affinity and selectivity, allowing researchers to elucidate the molecular determinants of ligand-receptor interactions. This application is crucial for mapping receptor binding sites, investigating competitive inhibition, and understanding the pharmacodynamics of peptide-receptor engagement in both in vitro and ex vivo systems.
Signal Transduction Studies: Due to its capacity to modulate angiotensin II receptor activity, [Sar1, Ile8]-Angiotensin II TFA is frequently employed in studies examining intracellular signaling cascades initiated by peptide-receptor binding. Researchers use it to dissect G protein-coupled receptor (GPCR) activation, second messenger production, and downstream effector pathways such as phospholipase C activation, calcium mobilization, and MAP kinase signaling. These investigations help clarify the role of specific peptide variants in modulating cellular responses and contribute to a deeper understanding of RAS-mediated signal transduction.
Peptide Structure-Activity Relationship (SAR) Analysis: The analog's defined amino acid substitutions make it a critical component in systematic SAR studies aimed at correlating structural modifications with biological activity. By comparing the functional effects of [Sar1, Ile8]-Angiotensin II TFA to those of native angiotensin II and other analogs, researchers can identify key residues essential for receptor activation, potency, and selectivity. Such studies inform the rational design of novel peptide ligands and antagonists for basic research and drug discovery applications.
Vascular and Smooth Muscle Research: The compound is a valuable tool for investigating the contractile and proliferative effects of angiotensin peptides on vascular smooth muscle cells. Its distinct receptor interaction profile enables precise delineation of the pathways governing vasoconstriction, cellular proliferation, and extracellular matrix modulation. These applications are especially relevant in the context of hypertension, vascular remodeling, and cardiovascular pathophysiology, where understanding peptide-mediated effects is essential for advancing fundamental knowledge.
Peptide Antagonist Evaluation: [Sar1, Ile8]-Angiotensin II TFA is also utilized as a control or reference compound in the assessment of novel angiotensin receptor antagonists. Its well-characterized pharmacological properties provide a benchmark for evaluating the efficacy, specificity, and mechanism of action of newly developed inhibitors or modulators targeting the angiotensin II signaling axis. This approach supports the development and validation of innovative research tools for probing the complexities of peptide hormone signaling.
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