Extracts of Koelreuteria henryi Dummer induce apoptosis and autophagy by inhibiting dihydrodiol dehydrogenase, thus enhancing anticancer effects

Dihydrodiol dehydrogenase (DDH) is frequently detected in cancer cells, and its overexpression correlates with drug resistance, the downregulation of DNA repair mechanisms, increased frequency of tumor recurrence, cancer cell metastasis and poor prognosis. The silencing of DDH expression using siRNA...

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Published in:International journal of molecular medicine 2013-09, Vol.32 (3), p.577-584
Main Authors: CHIANG, YUNG-YEN, WANG, SHU-LI, YANG, CHENG-LIN, YANG, HUI-YU, YANG, HSIU-CHING, SUDHAKAR, J.N, LEE, CHING-KUO, HUANG, HSIU-WEN, CHEN, CHIEN-MIN, CHIOU, SHIOW-HER, CHIANG, SHU-FEN, FANG, HSIN-YUAN, CHEN, CHIH-YI, SHIEH, SHWN-HUEY, CHOW, KUAN-CHIH
Format: Article
Language:English
Subjects:
Apoptosis
Autophagy
Dehydrogenases
Deoxyribonucleic acid
dihydrodiol dehydrogenase
DNA
drug detoxification
Enzymes
lipid flow
Lipids
Lung cancer
Medical prognosis
oncogene
Ovarian cancer
Proteins
Studies
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Summary:Dihydrodiol dehydrogenase (DDH) is frequently detected in cancer cells, and its overexpression correlates with drug resistance, the downregulation of DNA repair mechanisms, increased frequency of tumor recurrence, cancer cell metastasis and poor prognosis. The silencing of DDH expression using siRNA, on the other hand, reduces drug resistance and cancer cell mobility. These data suggest that DDH may be an oncogene-related protein. However, no specific DDH inhibitor has been identified to date. Thus, in this study, we used DDH as a target enzyme in a live-cell enzyme-linked immunosorbent assay to screen Chinese medicinal herb extracts (CMHEs) with the aim of identifying a DDH inhibitor. Using this method, we found 49 among 796 CMHEs that inhibited DDH expression. We selected three potential extracts, which had the highest activity against DDH, for further fractionation using high-performance liquid chromatography. The active ingredient was identified by immunoblot analysis. The function of the active ingredient was characterized by cell function analysis. Our results revealed that the CMHE-purified compounds targeted DDH, inducing autophagy and reducing DNA repair, which in turn enhanced the cytotoxic effects of the anticancer drugs and irradiation.
ISSN:1107-3756
1791-244X
DOI:10.3892/ijmm.2013.1441