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The activities of some lysosomal hydrolases in the development of the cement gland inXenopus laevis

✍ Scribed by Hsu, Teresa Wei ;Lyerla, Timothy A.

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
596 KB
Volume
199
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The hydrolases B‐glucuronidase, B‐galactosidase and N‐acetyl‐B‐D‐glucosaminidase were examined in Xenopus laevis for their pH optima, sedimentability by differential centrifugation and optimal incubation temperatures for their assays. Enzyme activities were enriched in the 20,000 × g fraction of tissue homogenates, and all three of the enzymes exhibited acid pH optima, supporting the assumption that these are lysosomal enzymes in X. laevis. Total and specific activities of B‐glucuronidase and N‐acetyl‐B‐D‐glucosaminidase were significantly higher in homogenates from regressing cement glands compared with those from preregressing glands. Cement gland regression, then is, apparently accompanied by lysosomal activation.

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