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Characteristics of mitochondrial events in synthetic bile acids-induced apoptosis of human osteosarcoma cells

KIM,GYOO-CHEON 1 황윤 1 박재현 1 문용석 2 Young Hyun Yoo 3 Shin Sanghun 1 Kyung-Il Um 3 PARK,BONG SOO 1

1부산대학교
2대구카톨릭대학교
3동아대학교

Candidate

ABSTRACT

Apoptosis of osteosarcoma cells induced by bile duct derivates, HS-1200 was investigated with relation to mitochodria. HS-1200 induced cytochrome c and Smac/DIABLO release from mitochondria which are major factors related to apoptosis. In these apoptosis processes, release of cytochrome c was not blocked by caspase inhibitor, but release of Smac/DIABLO was blocked. BKA, a kind of PTP (permeablity transition pore) inhibitor, did not block both of them. Interestingly, the alteration of MMP was not observed by means of using JC-1 dye. Although MitoTracker, DiOC-6 and Rhodamine123 were used to confirm previous results, the decrease of MMP was not observed. In order to investigate whether this phenomenon is apoptosis-specific or cell-specific process, genistein was added to cells which usually decreased MMP. After adding genistein, MMP was not decreased, suggesting this phenomenon is cell-specific process. Conclusionally, HS-1200 induced apoptosis of osteosarcoma cells via mitochondria, cytochrome c and Smac/ DIABLO were released from mitochondria without decrease of MMP. The release of Smac/DIABLO was dependent of caspase.

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