A Technique for the histochemical demonstration of polyphenol oxidase and its application to egg-shell formation in helminths and byssus formation in mytilus
Open Access
- 1 June 1954
- journal article
- Published by The Company of Biologists in Journal of Cell Science
- Vol. S3-95 (30), 139-152
- https://doi.org/10.1242/jcs.s3-95.30.139
Abstract
1. The distribution of polyphenol oxidase in quinone-tanning systems may be demonstrated in frozen-dried sections by incubation in 0.2 per cent, aqueous catechol at 400° C. for 15-60 minutes. A red colour develops at the enzyme site. 2. The evidence for the view that the egg-shell in trematodes, in certain cestode groups, and in turbellarians, is a quinone-tanned protein secreted by the so-called ‘vitelline’ glands, is summarized. The ‘vitelline’ cells, in addition to giving positive reactions for proteins and phenols, give a strongly positive reaction with the catechol polyphenol oxidase test. 3. The catechol technique may also be applied to whole helminths fixed in 70 per cent, alcohol, and serves as a useful whole mount stain for the shell-producing regions of the female genitalia. 4. In Mytilus the catechol technique reveals the presence of polyphenol oxidase in an ‘upper’ or enzyme gland in the foot. 5. It is suggested that in Mytilus the byssus is formed from a phenolic protein secreted from the phenol gland, which on contact with polyphenol oxidase can undergo ‘auto-quinone tanning’.Keywords
This publication has 8 references indexed in Scilit:
- Studies on tapeworm physiology. VII. Fertilization of Schistocephalus solidus in vitroExperimental Parasitology, 1954
- Egg-Shell Formation in Trematodes and Cestodes as Demonstrated by the Methyl or Malachite Green TechniquesNature, 1951
- Specific Staining of Egg-Shell Material in Trematodes and CestodesStain Technology, 1951
- Studies on Tapeworm Physiology. V. Further Observations on the Maturation of Schistocephalus solidus (Diphyllobothriidae) under Sterile Conditions In vitroJournal of Parasitology, 1950
- Quinone Tanning in the Cocoon-Shell of Dendroœlum lacteumNature, 1950
- Physiological and histochemical observations on the adult liver fluke, Fasciola hepatica L. III. Egg-shell formationParasitology, 1947
- Protocatechuic acid, the substance responsible for the hardening of the cockroach oothecaBiochemical Journal, 1946
- Ricerche istochimiche sui vitellogeni dei platelmintiBolletino di zoologia, 1933