Overview
Somatostatin, also known as growth hormone-inhibiting hormone (GHIH), is a cyclic peptide hormone produced in the hypothalamus, pancreas, and gastrointestinal tract. It plays a critical role in regulating the endocrine system by inhibiting the secretion of growth hormone, insulin, glucagon, and other hormones. Discovered in 1973, somatostatin has since become an important therapeutic agent in treating conditions like acromegaly and certain tumors. There are two active forms of somatostatin: a 14-amino acid peptide (SST-14) and a 28-amino acid peptide (SST-28). Both forms bind to somatostatin receptors (SSTR1-5) to exert their effects. Due to its short half-life (approximately 1-3 minutes), synthetic analogs like octreotide and lanreotide have been developed for clinical use.
Physical and Chemical Properties
Somatostatin is a white to off-white powder with a molecular weight of 1637.9 g/mol. It is soluble in water and slightly soluble in ethanol. The peptide is heat-sensitive and decomposes at temperatures above 215°C, making proper storage conditions essential for maintaining stability. The molecule's cyclic structure, formed by a disulfide bond between two cysteine residues, is crucial for its biological activity. This structure allows somatostatin to bind effectively to its receptors. The peptide's solubility and stability are pH-dependent, with optimal stability observed in slightly acidic to neutral conditions (pH 4-7).
Main Applications
Somatostatin and its synthetic analogs are primarily used in medicine to treat acromegaly, a condition caused by excessive growth hormone production. By inhibiting growth hormone secretion, somatostatin helps reduce symptoms like enlarged hands, feet, and facial features. It is also used to manage gastrointestinal bleeding, particularly in cases of esophageal varices or peptic ulcers. Another key application is in the treatment of neuroendocrine tumors, such as pancreatic islet cell tumors and carcinoid syndrome. Somatostatin analogs can inhibit hormone secretion from these tumors, alleviating symptoms like diarrhea and flushing. Additionally, somatostatin is used in diagnostic procedures, such as the somatostatin receptor scintigraphy, to detect tumors expressing somatostatin receptors.
Safety and Storage
Somatostatin should be handled with care to avoid inhalation, skin contact, or ingestion. Personal protective equipment, including gloves and safety goggles, is recommended when working with the peptide. In case of exposure, rinse affected areas thoroughly with water and seek medical advice if irritation persists. Proper storage is critical to maintain somatostatin's stability. The peptide should be stored at -20°C in a dry, dark place, preferably in airtight containers to prevent moisture absorption. Avoid repeated freeze-thaw cycles, as they can degrade the peptide. For long-term storage, lyophilized somatostatin is more stable than solutions.
B2B Procurement Guide
When procuring somatostatin for B2B purposes, it is essential to verify the peptide's purity, typically specified as >98% by HPLC. Reputable suppliers should provide certificates of analysis (CoA) and comply with Good Manufacturing Practices (GMP) or ISO standards. Bulk orders may require cold chain logistics to ensure the peptide remains stable during transit. Consider the intended application when selecting a supplier. For pharmaceutical use, ensure the supplier meets regulatory requirements (e.g., FDA, EMA). Price varies depending on purity, quantity, and supplier, with reference ranges commonly between $500 and $1,500 per gram. Negotiating long-term contracts or bulk discounts can help reduce costs for large-scale buyers.
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