Abstract
1. 1. SAMP lyase and AMP deaminase were determined in parenchymal and kupffer cells of rats fed either basal or carcinogen-enriched diets. Results were calculated on a U/mg protein and U/cell basis. 2. 2. Data indicated that although deaminase increased 1 1 2 - to 2-fold in parenchymal cells on a U/mg protein and U/cell basis from rats fed carcinogen-enriched diets there was a greater increase in U/mg protein. 3. 3. In contrast, little to no increase was seen in kupffer cells. 4. 4. SAMP lyase, however, depicted a smaller increase in parenchymal cells of carcinogen-enriched diet fed rats, but a 4- to 5-fold elevation in kupffer cells regardless of whether the data were expressed in U/mg protein or U/cell. 5. 5. These data indicate that increased activity of AMP deaminase may be a result of resistance to degradation in parenchymal cells, whereas SAMP lyase elevations in kupffer cells may reflect an increase in enzyme concentration.
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