β-lapachone induces growth inhibition and apoptosis in bladder cancer cells by modulation of BCL-2 family and activation of caspases

• Дата: 2006
• Автори: Lee, J.I., Choi, D.Y., Chung, H.S., Seo, H.G., Woo, H.J., Choi, B.T., Choi, Y.H.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут експериментальної патології, онкології і радіобіології ім. Р.Є. Кавецького НАН України 2006
• Назва видання: Experimental Oncology
• Теми: Original contributions
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/134525
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: β-lapachone induces growth inhibition and apoptosis in bladder cancer cells by modulation of BCL-2 family and activation of caspases / J.I. Lee, D.Y. Choi, H.S. Chung, H.G. Seo, H.J. Woo, B.T. Choi, Y.H. Choi // Experimental Oncology. — 2006. — Т. 28, № 1. — С. 30-35. — Бібліогр.: 22 назв. — англ.

Aim: To study in vitro the molecular mechanism of apoptosis caused by b-lapachone, a quinone obtained from the bark of the lapacho tree (Tabebuia avellanedae). Materials and Methods: The study was carried out on human bladder carcinoma T24 cell line. Determination of cell viability was done using trypan blue exclusion method, apoptosis quantitative estimation — by DAPI staining and agarose gel electrophoresis for DNA fragmentation. Flow cytometry analysis, RT-PCR and Western blot analysis, colorimetric assay of caspase activity were applied as well. Results: It was found that in micromolar range of concentrations b-lapachone inhibited the viability of T24 cells by inducing apoptosis, which could be proved by formation of apoptotic bodies and DNA fragmentation. Treatment of T24 cells with b-lapachone resulted in a down-regulation of Bcl-2 expression and up-regulation of Bax expression. b-lapachone-induced apoptosis was also associated with activation of caspase-3 and caspase-9, inhibition of IAP expression, and degradation of poly (ADP-ribose) polymerase, phospholipase C-g1 and b-catenin proteins. At the same time Fas and FasL levels were inhibited upon treatment with b-lapachone in a concentration-dependent manner. Conclusion: b-lapachone-induced apoptosis in T24 cells is mediated, at least in part, by the mitochondrial-signaling pathway.