Bufalin induces apoptosis through activation of both the intrinsic and extrinsic pathways in human bladder cancer cells.

Abstract:

:Bufalin, a major digoxin-like immunoreactive component of the Chinese medicine Chansu, is prepared from toad venom. This compound has been shown to exert a potential for anticancer activity against various human cancer cell lines in vitro. However, the detailed molecular mechanisms of its induction of apoptosis are still unclear. In this study, we investigated the apoptosis-inducing effect of bufalin in T24 human bladder cancer cells. Our data revealed that bufalin treatment resulted in a concentration-response growth inhibition of T24 cells by inducing cell cycle arrest at the G2/M phase and apoptosis, as evidenced by formation of apoptotic bodies, chromatin condensation and accumulation of cells in the sub-G1 phase. Apoptosis induction of T24 cells by bufalin showed correlation with proteolytic activation of caspase-3, -8 and -9, and concomitant degradation of poly (ADP-ribose) polymerases, and collapse of the mitochondria membrane potential. In addition, bufalin treatment resulted in an increase of the Bax/Bcl-2 (or Bcl-xL) ratio and caused down-regulation of inhibitor of apoptosis protein (IAP) family members. The increase in apoptosis by bufalin treatment was also associated with up-regulation of death receptor-related factors. Our data indicate that the growth inhibitory effects of bufalin occur through blockade of the G2/M phase, and that these cancer cells do not enter cell cycle progression and die through apoptosis via both intrinsic and extrinsic pathways.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Hong SH,Choi YH

doi

10.3892/or.2011.1451

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

114-20

issue

1

eissn

1021-335X

issn

1791-2431

journal_volume

27

pub_type

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