항산화 및 해독화 효소의 발현 유도를 통한 화학암예방
Role of Antioxidant/Phase II Enzyme Induction in Cancer Chemoprevention
나혜경, 이정상, 서영준,
소속 상세정보
나혜경 ( Na Hye-Kyung )
서울대학교 약학대학
이정상 ( Lee Jeong-Sang )
서울대학교 약학대학
서영준 ( Surh Young-Joon )
서울대학교 약학대학
KMID : 0603520040090040226
Abstract
One of the rational and effective strategies for chemoprevention is the blockade of DNA damage caused by carcinogenic insult. This can be achieved either by reducing the formation of reactive carcinogenic species or stimulating their detoxification. A wide spectrum of xenobiotic metabolizing enzymes catalyze both phase I (oxidation and reduction) and phase II biotransformation (conjugation) reactions involved in carcinogen activation and/or detoxification. Several antioxidant-response element (ARE)-regulated gene products, such as glutathione S-transferase, NAD(P)H:quinone oxidoreductase 1, UDP-glucuronosyltransferase, glutamate cysteine ligase, and heme oxygenase-1, are known to mediate detoxification and/or to exert antioxidant functions thereby protecting cells from genotoxic damage. The transcription of ARE-driven genes is regulated, at least in part, by nuclear transcription factor erythroid 2 p45-related factor 2 (Nrf2), which is sequestered in cytoplasm by Kelch-like ECH-associated protein 1 (Keap1). Exposure of cells to ARE inducers results in the dissociation of Nrf2 from Keap1 and facilitates translocation of Nrf2 to the nucleus, where it heterodimerizes with small Maf protein, and binds to ARE, eventually resulting in the transcriptional activation of Nrf2-regulated genes. The Nrf2-Keap1-ARE signaling pathway can be modulated by several upstream kinases including phosphatidylinositol 3-kinase, protein kinase C, and mitogen-activated protein kinases. Selected Nrf2-Keap1-ARE activators, such as oltipraz, sulforaphane, 6-methylsulphinylhexyl isothiocyanate, curcumin, caffeic acid phenethyl ester, diallyltrisulfide, etc., are potential chemopreventive agents. This mini-review will focus on a chemopreventive strategy directed towards protection of DNA and other important cellular molecules by inducing de novo synthesis of phase II detoxifying or antioxidant genes via the Nrf2-ARE core signaling pathway.
키워드
Chemoprevention;Antioxidant-response element (ARE);Electrophile-response element (EpRE);Nuclear transcription factor erythroid 2 p45- related factor 2 (Nrf2);Kelch-like ECH-associated protein 1 (Keap1);Phase II detoxifying or antioxidant enzymes
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