MAC related mitochondrial pathway in oroxylin A induces apoptosis in human hepatocellular carcinoma HepG2 cells

Abstract Oroxylin A is a flavonoid isolated from the root of Scutellaria baicalensis Georgi. Our previous work demonstrated that the anti-tumor activity of oroxylin A was mainly attributed to its apoptosis inducing effect in cells. The present study explores the exact molecular mechanism of oroxylin...

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Bibliographic Details
Published in:Cancer letters 2009-11, Vol.284 (2), p.198-207
Main Authors: Liu, Wei, Mu, Rong, Nie, Fei-Fei, Yang, Yong, Wang, Jun, Dai, Qin-Sheng, Lu, Na, Qi, Qi, Rong, Jing-Jing, Hu, Rong, Wang, Xiao-Tang, You, Qi-Dong, Guo, Qing-Long
Format: Article
Language:English
Subjects:
Apoptosis
Bax
Gene expression
Hematology, Oncology and Palliative Medicine
Liver cancer
MAC
Mitochondria
Mitochondrial DNA
Oroxylin A
Permeability
Proteins
PTP
ROS
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Summary:Abstract Oroxylin A is a flavonoid isolated from the root of Scutellaria baicalensis Georgi. Our previous work demonstrated that the anti-tumor activity of oroxylin A was mainly attributed to its apoptosis inducing effect in cells. The present study explores the exact molecular mechanism of oroxylin A-induced apoptosis in tumor cells. We showed that oroxylin A-induced apoptosis in HepG2 cells was achieved through mitochondrial pathway. We also investigated which mitochondrial channels, PTP or MAC or both, were involved in the permeabilization of the mitochondrial outer membrane after treatment with oroxylin A. The results showed that oroxylin A-induced apoptosis in a PTP-independent manner; therefore, we focused our attention on MAC. As Bax is an essential constituent of MAC in certain systems, we examined the activation, subcellular location, oligomeric structure of Bax in HepG2 cells treated with oroxylin A. Moreover, our results showed that overexpression of Bcl-2 inhibited oroxylin A-induced apoptosis. In summary, we have demonstrated that opening of MAC, but not PTP, played a key role in oroxylin A-induced activation of mitochondrial apoptotic pathway in HepG2 cells.
ISSN:0304-3835
1872-7980
DOI:10.1016/j.canlet.2009.04.021