Inhibition of carbohydrate incorporation in transformed cells by a cancer-associated galactosyltransferase acceptor (CAGA)

Journal of Cellular Physiology
D K PodolskyK J Isselbacher

Abstract

The effect of cancer-associated galactosyltransferase acceptor (CAGA) on incorporation of a variety of macromolecular precursors has been studied in transformed and nontransformed cells. Incorporation of [3H]-mannose, [3H]-galactose, and [3H]-glucosamine into acid precipitable material after one-hour pulse was inhibited more than 70% within four hours after exposure to CAGA in polyoma-transformed BHK cells and within eight hours after exposure in chick embryo fibroblasts infected with a temperature-sensitive RSV mutant (Ts68) grown at the permissive temperature (CEF-RSV 37 degrees C). Initial short-term rate of uptake (less than one minute) and total long-term uptake (one hour) of the labelled carbohydrates (acid-soluble and acid-insoluble material) was inhibited less than 15% over this period. Incorporation of 14C-leucine, 3H-serine, 3H-uridine, and 3H-thymidine into acid-precipitable material was also inhibited greater than 85% in transformed cells, but more than 12-hour exposure to CAGA was required before maximal inhibition was detected. Uptake of these labelled precursors was inhibited less than 20% up to eight hours after exposure to CAGA. In nontransformed cells (BHK and CEF) incorporation of labelled monosaccharides as ...Continue Reading

References

Aug 1, 1977·Proceedings of the National Academy of Sciences of the United States of America·D Duksin, P Bornstein
Sep 1, 1978·Proceedings of the National Academy of Sciences of the United States of America·D K PodolskyK J Isselbacher
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Citations

Dec 6, 1989·Biochimica Et Biophysica Acta·B D Shur

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