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. 1965 Nov;97(2):389–392. doi: 10.1042/bj0970389

Studies on bone enzymes. Distribution of acid hydrolases, alkaline phenylphosphatase, cytochrome oxidase and catalase in subcellular fraction of bone tissue homogenates

G Vaes 1, P Jacques 1
PMCID: PMC1264653  PMID: 16749143

Abstract

1. When bone homogenates were fractionated according to the scheme developed for liver by de Duve, Pressman, Gianetto, Wattiaux & Appelmans (1955), all the enzymes assayed except cytochrome oxidase were found to occur partly in soluble and partly in particulate fractions. Among the particle-bound enzymes, the highest specific activity was found in the heavy-mitochondrial fraction for cytochrome oxidase, in the microsomal fraction for alkaline phenylphosphatase and in the light-mitochondrial fraction for eight acid hydrolases and for catalase. 2. Combined heavy-mitochondrial and light-mitochondrial fractions were subfractionated by isopycnic centrifugation in density gradients of sucrose or glycogen. In the various systems tried, cytochrome oxidase showed a relatively narrow distribution range with a sharp peak; the acid hydrolases and catalase showed flat and irregular distribution patterns, differing slightly in shape from one enzyme to the other. However, it was not possible to achieve a marked separation between the various enzymes under study. 3. It is concluded from these results that the acid hydrolases belong to special cytoplasmic particles, probably lysosomes, and that these particles are physically and enzymically heterogeneous. Catalase appears to be non-mitochondrial and could also belong to the lysosomes; but the possibility of an association with another type of particle must be kept in mind in view of what is known of liver catalase. Alkaline phenylphosphatase is largely attached to microsomal elements.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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