Abstract
1. (1) Alkaline lipolytic activity (ALA), a soluble esterase found in human adipose tissue, has been visualized on starch gel after electrophoresis by a staining method which employs naphthol esters as substrates and Fast Blue B as a coupling agent 2. (2) The electrophoretic phenotype is manifest as five bands of esterase activity (ALA I-5) with similar substrate and inhibitor specificity, consistent with the isoenzyme concept 3. (3) The effects of time and temperature suggest that ALA 5 is a subunit of ALA i-4) 4. (4) I8 2 fresh adipose tissue preparations have been carefully studied and no genetic variations observed 5. (5) The characteristic electrophoretic bands of ALA have also been found in human liver, lung, heart, kidney, adrenal, spleen, thyroid, ovary, testis, brain and muscle 6. (6) The physiological function is not known, but their ability to hydrolize emulsions of long-chain fatty acid esters suggests a role in lipolysis.
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