Viral neoplastic transformation of hamster pineal cells in vitro: retention of enzymatic function

Cultures of hamster pineal tissue infected with certain oncogenic DNA viruses undergo neoplastic transformation and produce tumors when injected into homologous hosts. Hydroxyindole-O-methyl transferase, an enzyme found exclusively in the pineal gland, is present in low concentrations in transformed pineal cells in vitro and in larger amounts in tumors produced by the injected cells. This enzyme is not present in several nonpineal tissues similarly transformed.

Lactoperoxidase: identification and isolation from Harderian and lacrimal glands

Investigation of bovine lacrimal and harderian glands revealed the presence of the enzyme lactoperoxidase, which was isolated and purified. A nonheme, iron-containing protein was identified at the same time. Both proteins are present in milk, mammary glands, and salivary glands. Their roles are discussed: The lactoperoxidase may be important in controlling bacterial flora.

Lysosomal and free acid phosphatase in salivary glands of chironomus tentans

In cells of salivary glands of last-instar larvae of Chironomus tentans, acid phosphatase activity is bound to (probable) lysosomes and a few other cell organelles. At the end of the pupal molt the salivary gland breaks down. While acid phosphatase in areas of nondegenerated cells is still restricted to the structures mentioned, in degenerated areas the enzyme is freely distributed in the cytoplasm.