國家衛生研究院 NHRI:Item 3990099045/2455
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/2455


    Title: Increase of carcinogenic risk via enhancement of cyclooxygenase-2 expression and hydroxyestradiol accumulation in human lung cells as a result of interaction between BaP and 17-beta estradiol
    Authors: Chang, LW;Chang, YC;Ho, CC;Tsai, MH;Lin, P
    Contributors: Division of Environmental Health and Occupational Medicine
    Abstract: Animal studies demonstrated that females are more susceptible than males to benzo[a]pyrene (BaP)-induced toxicities, including lung carcinogenesis. Elevation of cyclooxygenase-2 (COX-2) expression has been shown to increase the risk of cancer development. BaP induces COX-2 expression, and an interaction between BaP and estrogen in relation to COX-2 expression is suspected. In the present study, 10 mu M BaP alone only slightly increased COX-2 mRNA expression and 10 nM 17-beta estradiol (E-2) alone slightly increased prostaglandin E2 (PGE2) secretion in human bronchial epithelial cells. However, co-treatment with BaP and E2 potentiated COX-2 mRNA expression and significantly elevated PGE2 secretion. Utilizing specific inhibitors and reporter assays, we further investigated the potentiation mechanisms of E2 on BaP-induced COX-2 expression. First, E2 activated estrogen receptor to increase PGE2 secretion, which directly increased COX-2 expression. Second, E2 potentiated BaP-induced nuclear factor-kappa B (NF-kappa B) activation, which regulates COX-2 expression. Third, although the aryl hydrocarbon receptor (AhR) did not play a role in BaP-induced COX-2 expression, the potentiation effect of E2 itself was AhR dependent. We further demonstrated that BaP induced the production of genotoxic E-2 metabolites (2- and 4-hydroxyestradiols) via AhR-up-regulated cytochromes P450 1A1 and 1B1. These metabolites could directly activate NF-kappa B to further promote COX-2 mRNA expression in human lung epithelial cells. These findings were further supported by increased PGE2 secretion in rat lung slice cultures. Our findings that the BaP-E-2 interaction enhanced COX-2 expression and hydroxyestradiol accumulation in the media of cultivated lung cells and tissues provide the needed scientific basis for higher risk of BaP-associated lung cancer in females.
    Keywords: Oncology
    Date: 2007-07
    Relation: Carcinogenesis. 2007 Jul;28(7):1606-1612.
    Link to: http://dx.doi.org/10.1093/carcin/bgm013
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0143-3334&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000248729600032
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=34547749483
    Appears in Collections:[Pinpin Lin] Periodical Articles
    [Louis W. Chang(1999-2009)] Periodical Articles

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