國家衛生研究院 NHRI:Item 3990099045/5295
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    题名: Higher susceptibility to aflatoxin B1-related hepatocellular carcinoma in glycine N-methyltransferase knockout mice
    作者: Liu, SP;Li, YS;Lee, CM;Yen, CH;Liao, YJ;Huang, SF;Chien, CH;Chen, YMA
    贡献者: Division of Molecular and Genomic Medicine
    摘要: In both humans and rodents, males are known to be more susceptible than females to hepatocarcinogenesis. We have previously reported that glycine N-methyltransferase (GNMT) interacts with aflatoxin B<sub>1</sub> (AFB <sub>1</sub>) and reduces both AFB<sub>1</sub>-DNA adduct formation and hepatocellular carcinoma (HCC) in mice. We also reported that 50% of the males and 100% of the females in a small group of Gnmt null (Gnmt-/-) mice developed HCC, with first dysplastic hepatocellular nodules detected at mean ages of 17 and 16.5 months, respectively. In our study, we tested our hypothesis that male and female Gnmt-/- mice are susceptible to AFB<sub>1</sub> carcinogenesis, and that the absence of Gnmt expression may accelerate AFB<sub>1</sub>-induced liver tumorigenesis. We inoculated Gnmt-/- and wild-type mice intraperitoneally with AFB<sub>1</sub> at 7 days and 9 weeks of age and periodically examined them using ultrasound. Dysplastic hepatocellular nodules were detected in six of eight males and five of five females at 12.7 and 12 months of ages, respectively. Dysplastic hepatocellular nodules from 5/8 (62.5%) male and 4/5 (80%) female Gnmt-/- mice were diagnosed as having HCC, ?6 months earlier than AFB<sub>1</sub>-treated wild-type mice. Results from microarray and real-time PCR analyses indicate that five detoxification pathway-related genes were downregulated in AFB<sub>1</sub>-treated Gnmt-/- mice: Cyp1a2, Cyp3a44, Cyp2d22, Gsta4 and Abca8a. In summary, we observed overall higher susceptibility to AFB<sub>1</sub>-related HCC in Gnmt-/- mice, further evidence that GNMT overexpression is an important contributing factor to liver cancer resistance.
    日期: 2011-02
    關聯: International Journal of Cancer. 2011 Feb;128(3):511-523.
    Link to: http://dx.doi.org/10.1002/ijc.25386
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0020-7136&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000285264000002
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=78649831564
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