Influence of formycin B on polyadenosine diphosphoribose synthesis in vitro and in vivo.
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| Abstract |
Formycin B inhibited growth of L5178Y mouse leukemia cells in concentrations of less than twice the concentration that inhibits cell proliferation at 50% by cytostasis; at higher concentrations (more than twice the 50% concentration mentioned), the cells were killed. In cells treated with the concentration that inhibits cell proliferation at 50%, the average cell volume did not change. The formycin B inhibitory effect on cell proliferation was reduced by coincubation with nicotinamide adenine diphosphate or adenosine. The biosyntheses of DNA,RNA, and protein in whole cells were sensitively inhibited by formycin B as checked by incorporation studies with radioactive precursors. In addition, the formation of polyadenosine diphosphoribose was reduced even with higher sensitivity; in particular the extent of adenosine diphosphate ribosylation of histone subfraction H1 was reduced. Formycin B has been shown to be an inhibitor for the polyadenosine diphosphoribose polymerase, isolated from oviduct nuclei of quails. Both the chromatin-bound and the soluble enzyme are inhibited competitively; the relative affinity (Ki/Km) of formycin B to the polyadenosine diphosphoribose polymerase is 1.5.
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| Authors | W E Müller, H J Rohde, R Steffen, A Maidhof, M Lachmann, R K Zahn, H Umezawa |
| Journal | Cancer research (Cancer Res) Vol. 35 Issue 12 Pg. 3673-81 (Dec 1975) ISSN: 0008-5472 [Print] United States |
| PMID | 172231 (Publication Type: Journal Article) |
| Chemical References |
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