Abstract
The name pancreatic cholesterol esterase is ascribed to the only enzyme in the pancreas that hydrolyzes cholesterol esters to unesterified cholesterol and free fatty acids. However, extensive investigations over a period of more than 30 years revealed that a protein with similar properties can also be purified from homogenates of several other tissues and body fluids and that the enzyme is a nonspecific lipase capable of hydrolyzing cholesteryl esters, vitamin esters, triacylglycerol, phospholipids, and lysophospholipids. At the onset of these investigations, it was not clear whether these various enzyme activities were properties of the same protein. Thus, this enzyme was also named nonspecific lipase, phospholipase A1 lysophospholipase, bile-salt-stimulated lipase, bile-salt-dependent lipase, carboxyl ester lipase, and carboxyl ester hydrolase. (Please see Rudd and Brockman, 1984; Wang and Hart-suck, 1993, for a historic perspective of this protein.) It required the cloning of cDNA based on different enzyme activities from different tissues and different species to conclusively demonstrate that the same gene product has several distinct but related enzymatic activities (Han et al., 1987; Kissel et al., 1989; Kyger et al., 1989; Hui and Kissel, 1990; Reue et al., 1991; Colwell et al., 1993; Mackay and Lawn, 1995). Sequence comparison with other proteins also revealed that this enzyme is responsible for the lipoamidase activity in milk (Hui et al., 1993), which may account for its ability to hydrolyze the physiological lipoamide substrate ceramide (Nyberg et al., 1998). Due to the various substrates for this enzyme, the best nomenclature for its name has been widely debated over the years. The more commonly used names include carboxyl ester lipase (CEL), which is based on its general reactivity with lipids containing carboxyl ester bonds; cholesterol esterase or cholesterol ester lipase, which is based on its documented physiological function as a cholesteryl ester hydrolase; and bile-salt-stimulated lipase (BSSL) or bile salt-dependent lipase (BSDL), which is based on the unique bile-salt-dependency of this enzyme. Because CEL can be used to refer to the enzymatic properties and physiological function of this protein, we have adopted this terminology throughout this chapter.
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Howles, P.N., Hui, D.Y. (2001). Cholesterol Esterase. In: Mansbach, C.M., Tso, P., Kuksis, A. (eds) Intestinal Lipid Metabolism. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1195-3_7
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