Abstract
In the course of screening for antitumor antibiotics using 3Y1 rat fibroblasts transformed with adenovirus oncogenes, a new active substance designated thioviridamide was isolated from the culture broth of an actinomycete. The producing organism was identified as Streptomyces olivoviridis on the basis of its culture characteristics and physiological properties. Thioviridamide showed cytotoxicity selectively against Ad12-3Y1 cells (IC50=3.9 ng/ml) and E1A-3Y1 cells (IC50=32 ng/ml), both of which contain the adenovirus E1A oncogene. Significant numbers of Ad12-3Y1 cells treated with thioviridamide contained condensed chromatin and fragmented nuclei, indicating that thioviridamide induced apoptosis.
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Hayakawa, Y., Sasaki, K., Adachi, H. et al. Thioviridamide, a Novel Apoptosis Inducer in Transformed Cells from Streptomyces olivoviridis. J Antibiot 59, 1–5 (2006). https://doi.org/10.1038/ja.2006.1
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DOI: https://doi.org/10.1038/ja.2006.1
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