Overview
Endothelin is a family of peptides primarily produced by endothelial cells, with endothelin-1 (ET-1) being the most studied isoform. Discovered in 1988, it is known for its potent vasoconstrictive properties and role in regulating vascular tone. Endothelin acts through G-protein-coupled receptors (ET_A and ET_B), influencing blood pressure, cell growth, and inflammation. In addition to its physiological roles, endothelin is implicated in various pathological conditions, including hypertension, heart failure, and pulmonary arterial hypertension. Its study has led to the development of endothelin receptor antagonists, used therapeutically to manage these conditions.
Physical and Chemical Properties
Endothelin peptides are characterized by their small size (21 amino acids for ET-1) and disulfide bonds, which stabilize their structure. The peptides are typically supplied as lyophilized powders, soluble in aqueous solutions and dilute acids. Their stability is pH-dependent, with optimal activity in neutral to slightly acidic conditions. Endothelin's biological activity is highly sensitive to degradation by proteases, requiring careful handling and storage. Analytical methods such as HPLC and mass spectrometry are commonly used to assess purity and confirm structural integrity.
Main Applications
Endothelin is widely used in biomedical research to study vascular biology, cardiovascular diseases, and cancer. Its role in vasoconstriction and cell proliferation makes it a target for drug development, particularly in treating pulmonary hypertension and heart failure. In pharmaceuticals, endothelin receptor antagonists like bosentan and ambrisentan are clinically approved to manage pulmonary arterial hypertension. Research-grade endothelin peptides are also employed in in vitro and in vivo studies to elucidate signaling pathways and therapeutic mechanisms.
Safety and Storage
Endothelin peptides should be stored at -20°C in a dry, dark environment to prevent degradation. Reconstituted solutions are stable for short-term use at 4°C but should be aliquoted and frozen for long-term storage. Handling requires standard laboratory precautions, including gloves and eye protection. Avoid inhalation or skin contact, as endothelin may cause irritation. Proper disposal methods should follow institutional guidelines for bioactive peptides.
B2B Procurement Guide
When procuring endothelin, prioritize suppliers with certified quality control and batch-specific certificates of analysis. Key specifications include purity (>95%), endotoxin levels (<1 EU/mg), and biological activity verified by bioassays. Bulk purchases may offer cost savings, but ensure adequate storage capacity. For research use, smaller quantities (e.g., 0.1–1 mg) are commonly available. Compare lead times and cold-chain logistics to maintain product integrity during shipping.
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