Abstract
The effects of the differentiation-inducing agents sodium butyrate (NaOBt), dimethylsulfoxide (DMSO) and mycophenolic acid (MA), on purine nucleotide metabolism, was studied in an ovarian carcinoma cell line (GZL-8). Exposure to these agents inhibited cell proliferation, but did not affect cell viability. Three hours following exposure, NaOBt and DMSO moderately decelerated purine synthesis de novo, but MA accelerated it three-fold, this being associated with a two-fold increase in the excretion of hypoxanthine and xanthine into the incubation medium. NaOBt and DMSO did not affect the cellular nucleotide content, but MA caused a 73% decrease in GTP content and about a 50% increase in the cellular content of UTP. The following alterations in cellular enzyme activity were observed 72 h following exposure: NaOBt decreased the activity of hypoxanthine-guanine phosphoribosyltransferase and increased the activity of IMP and of IMP 5′-nucleotidases, DMSO increased the activity of IMP 5′-nucleotidase, and MA increased the activity of the two nucleotidases. The results suggest that, in the carcinoma cell line studied, the differentiation process induced by NaOBt and DMSO may be associated with a general shift in the direction of purine metabolism from anabolism to catabolism, whereas that induced by MA is associated with a specific decrease in the production of GTP.
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Abbreviations
- DMSO:
-
dimethylsulfoxide
- MA:
-
mycophenolic acid
- PRibPP :
-
5′-phosphoribosyl 1-pyrophosphate
- NaOBt:
-
sodium butyrate
- HGPRT:
-
hypoxanthine-guanine phosphoribosyltransferase
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Zoref-Shani, E., Lavie, R., Bromberg, Y. et al. Effects of differentiation-inducing agents on purine nucleotide metabolism in an ovarian cancer cell line. J Cancer Res Clin Oncol 120, 717–722 (1994). https://doi.org/10.1007/BF01194269
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DOI: https://doi.org/10.1007/BF01194269