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- W2083493209 abstract "Two human melanoma cell lines, MM96 and MM127, were found to be highly sensitive to the toxicity of adenosine (D50 100-150 micrograms/ml) compared with other melanoma lines. HeLa cells and a lymphoblastoid line (D50 greater than 500 micrograms/ml). The MM127 line was also sensitive to NAD (D50 41 micrograms/ml) compared with the other lines (D50 greater than 400 micrograms/ml), and accumulated three-fold more NAD-derived isotopic label. Nicotinamide exhibited little toxicity in any cell type (D50 greater than 400 micrograms/ml); 25-100 micrograms/ml nicotinamide greatly increased the plating efficiency of melanoma cells and fibroblasts when low levels of foetal calf serum were used. The toxicity of DNA-damaging agents (alkylating agents and u.v.) in melanoma cells was not reduced in the presence of NAD, adenosine or nicotinamide. Studies of the effects of the latter compounds upon the incorporation of deoxynucleosides showed that: (a) melanoma cells have lower purine pools than fibroblasts; (b) [3H]deoxyguanosine incorporation was inhibited more than [3H]deoxyadenosine incorporation; (c) incorporation of [3H]deoxyadenosine and [3H]deoxyguanosine into RNA was inhibited by adenosine, thus providing a method for determination of guanine-specific DNA repair; and (d) NAD enhanced thymidine incorporation in intact melanoma cells but not in fibroblasts, in a pattern similar to the release from template restriction previously reported for permeabilised tumour cells." @default.
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- W2083493209 date "1983-03-01" @default.
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- W2083493209 title "Differential effects of NAD, nicotinamide and related compounds upon growth and nucleoside incorporation in human cells" @default.
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- W2083493209 doi "https://doi.org/10.1016/0006-2952(83)90590-7" @default.
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