Study of B Particles in Stomach Milk of Nursing Mice

With procedures effective for isolation of B particles from breast milk, no particles were found in extracts of coagulated stomach milk from suckling mice nursing on mothers containing the mammary tumor agent. Treatment at 37° C for ½ hour of coagulated stomach milk slurries with stomach juices, try...

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Bibliographic Details
Published in:JNCI : Journal of the National Cancer Institute 1965-06, Vol.34 (6), p.777-793
Main Authors: Miroff, George, Magdoff-Fair-Child, Beatrice S.
Format: Article
Language:English
Subjects:
Animals
Animals, Newborn - metabolism
Biological Assay
Breast Feeding
Breast Neoplasms - etiology
Mammary Tumor Virus, Mouse - isolation & purification
Mice
Milk
Stomach
Virus Cultivation
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Summary:With procedures effective for isolation of B particles from breast milk, no particles were found in extracts of coagulated stomach milk from suckling mice nursing on mothers containing the mammary tumor agent. Treatment at 37° C for ½ hour of coagulated stomach milk slurries with stomach juices, trypsin, chymotrypsin, or pepsin yielded extracts from which B particles could be sedimented. Morphologically and in their buoyant densities in cesium chloride these B particles were indistinguishable from those obtained from breast milk. The activity of stomach milk was associated with the supernatant fraction after ultracentrifugation of buffered extracts of stomach milk. The washed sediments containing B particles were inactive. These results indicate the active principle in stomach milk is a molecule unsedimentable after 1 hour at 100,000 × g.
ISSN:0027-8874
1460-2105
DOI:10.1093/jnci/34.6.777