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Studies on acid lipase, and E 600-resistant acid esterase activities in human tissue homogenates

CW Young, J Mladek, SW Smith and ES Bittar

Detailed comparison of acid lipase and acid esterase activities of human spleen, liver and kidney homogenates has been carried out by means of the following substrates: 14C-tripalmitin, alpha-naphthyl acetate, alpha-naphthyl butyrate, alpha-naphthyl laurate, p-nitro- phenyl acetate, butyrate and laurate. In addition, homogenates of the three tissues were subjected to isoelectric focusing in polyacrylamide gels and histochemical staining with the above mentioned naphthyl substrates in the presence and absence of the organophosphate esterase inhibitor diethyl-p-nitrophenyl phosphate (E 600). These studies provide extensive support for the proposal that E 600-resistant acid naphthyl butyryl and lauryl esterase activities in human tissues derive largely from the enzyme acid lipase. The studies suggest that the most specific chromogenic substrate for this enzyme at a biochemical and histochemical level is alpha-napthyl laurate in the presence of E600 (3 X 10(-6) M).

Volume 26, Issue 10, pp. 829-834, 10/01/1978
Copyright © 1978 by The Histochemical Society


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