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. 1984 Nov;36(6):1190–1203.

Cholesteryl ester storage disease and Wolman disease: phenotypic variants of lysosomal acid cholesteryl ester hydrolase deficiency.

J M Hoeg, S J Demosky Jr, O H Pescovitz, H B Brewer Jr
PMCID: PMC1684644  PMID: 6097111

Abstract

The lysosomal enzyme responsible for cholesteryl ester hydrolysis, acid cholesteryl ester hydrolase, or acid lipase (E.C.3.1.1.13) plays an important role in cellular cholesterol metabolism. Loss of the activity of this enzyme in tissues of individuals with both Wolman disease and cholesteryl ester storage disease is believed to play a causal role in these conditions. The objectives of our studies were not only to directly compare and contrast the clinical features of Wolman disease and cholesteryl ester storage disease but also to determine the reasons(s) for the varied phenotype expression of acid cholesteryl ester hydrolase deficiency. Although both diseases manifest a type II hyperlipoproteinemic phenotype and hepatomegaly secondary to lipid accumulation, a more malignant clinical course with more significant hepatic and adrenal manifestations was observed in the patient with Wolman disease. However, the acid cholesteryl ester hydrolase activity in cultured fibroblasts in both diseases was virtually absent. In addition, fibroblasts from both Wolman disease and cholesteryl ester storage disease were able to utilize exogenously supplied enzyme, suggesting that neither disease was due to defective enzyme delivery by the mannose-6-phosphate receptor pathway. Coculture and cell fusion of fibroblasts from Wolman disease and cholesteryl ester storage disease subjects did not lead to correction of the enzyme deficiency, indicating that these disorders are allelic. However, the activities of the hepatic acid and neutral lipase in these two clinical variants were quite different. Hepatic acid lipase activity was only 4% normal in Wolman disease, but the activity was 23% normal in cholesteryl ester storage disease. The hepatic neutral lipase activity was normal in Wolman disease but increased more than twofold in cholesteryl ester storage disease. These combined results indicate that the clinical heterogeneity in acid cholesteryl ester hydrolase deficiency can be explained by a varied hepatic metabolic response to an allelic mutation.

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Selected References

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