Overview
Hormone-sensitive lipase (HSL) is an enzyme critical for lipid metabolism, primarily functioning to hydrolyze stored triglycerides in adipose tissue. It is regulated by hormonal signals, including catecholamines and insulin, which modulate its activity in response to energy demands. HSL is a key focus in metabolic research due to its role in conditions like obesity and type 2 diabetes. Discovered in the mid-20th century, HSL has since been extensively studied for its enzymatic mechanisms and regulatory pathways. Its activity is pivotal during fasting or exercise, where it mobilizes fatty acids for energy production. Researchers also investigate HSL for its potential as a therapeutic target in metabolic disorders.
Physical and Chemical Properties
HSL is a protein with a molecular weight of approximately 84-88 kDa, depending on post-translational modifications. It exists as a lyophilized powder in its purified form and is soluble in aqueous buffers. The enzyme's activity is pH-dependent, with optimal performance near neutral pH. Structurally, HSL contains regulatory domains that respond to phosphorylation by protein kinases, such as protein kinase A. This phosphorylation activates the enzyme, enabling it to break down triglycerides. HSL's stability is maintained under controlled storage conditions, typically at -20°C in a desiccated environment.
Main Applications
HSL is primarily used in biochemical and medical research to study lipid metabolism and energy regulation. Its role in hydrolyzing triglycerides makes it a valuable tool for investigating metabolic diseases like obesity, diabetes, and cardiovascular disorders. In the pharmaceutical industry, HSL is explored as a potential target for drugs aimed at modulating lipid metabolism. Research-grade HSL is also employed in enzyme assays and diagnostic kits to evaluate metabolic pathways and screen for inhibitors or activators.
Safety and Storage
HSL should be handled with standard laboratory precautions, including the use of gloves and protective eyewear. Avoid inhalation or direct contact with skin or eyes. In case of exposure, rinse thoroughly with water and seek medical advice if irritation persists. For long-term stability, store HSL at -20°C in a desiccated environment. Avoid repeated freeze-thaw cycles, as this may degrade the enzyme. Always verify activity and purity before use in sensitive experiments.
B2B Procurement Guide
When procuring HSL for research or industrial use, prioritize suppliers that provide detailed certificates of analysis, including purity, activity, and endotoxin levels. Research-grade HSL typically costs between $200-$500 per mg, depending on the supplier and specifications. Consider the enzyme's intended application—whether for assays, drug development, or diagnostic purposes—and ensure the product meets the required standards. Bulk purchases may offer cost savings, but verify storage and handling protocols to maintain quality.