title: Extracts of Koelreuteria henryi Dummer induce apoptosis and autophagy by inhibiting dihydrodiol dehydrogenase, thus enhancing anticancer effects.
abstract: 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.
authors.affiliation: Department of Dental Laboratory Technology, Central Taiwan University of Science and Technology, Taichung, Taiwan, R.O.C.
authors.forename: Yung-Yen
authors.initials: YY
authors.lastname: Chiang
authors.forename: Shu-Li
authors.initials: SL
authors.lastname: Wang
authors.forename: Cheng-Lin
authors.initials: CL
authors.lastname: Yang
authors.forename: Hui-Yu
authors.initials: HY
authors.lastname: Yang
authors.forename: Hsiu-Ching
authors.initials: HC
authors.lastname: Yang
authors.forename: J N
authors.initials: JN
authors.lastname: Sudhakar
authors.forename: Ching-Kuo
authors.initials: CK
authors.lastname: Lee
authors.forename: Hsiu-Wen
authors.initials: HW
authors.lastname: Huang
authors.forename: Chien-Min
authors.initials: CM
authors.lastname: Chen
authors.forename: Shiow-Her
authors.initials: SH
authors.lastname: Chiou
authors.forename: Shu-Fen
authors.initials: SF
authors.lastname: Chiang
authors.forename: Hsin-Yuan
authors.initials: HY
authors.lastname: Fang
authors.forename: Chih-Yi
authors.initials: CY
authors.lastname: Chen
authors.forename: Shwn-Huey
authors.initials: SH
authors.lastname: Shieh
authors.forename: Kuan-Chih
authors.initials: KC
authors.lastname: Chow
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects*; D001343:Autophagy / Q000187:drug effects*; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002518:Ceramides / Q000378:metabolism; D004357:Drug Synergism; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006801:Humans; D044949:Kaempferols / Q000494:pharmacology; D010088:Oxidoreductases / Q000037:antagonists & inhibitors*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D029631:Sapindaceae / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D002518:Ceramides; D004791:Enzyme Inhibitors; D044949:Kaempferols; D010936:Plant Extracts; C001579:astragalin; D010088:Oxidoreductases; C048338:trans-1,2-dihydrobenzene-1,2-diol dehydrogenase