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Journal of Tea Science ›› 2011, Vol. 31 ›› Issue (3): 255-263.doi: 10.13305/j.cnki.jts.2011.03.001

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The Antagonistic Effects of Green Tea Polyphenols on the Malformations of the Fertilized Eggs of Japanese Medaka (Oryzias latipes) Induced by Benzo[a]pyrene

SONG Chuan-kui, XIAO Bin*, WANG Yan-li, YU You-ben, ZHOU Tian-shan   

  1. College of Horticulture, Northwest A & F University, Yangling 712100, China
  • Received:2010-11-24 Revised:2011-01-20 Online:2011-06-15 Published:2019-09-06

Abstract: The effects of green tea polyphenols on the malformations of the fertilized eggs of Japanese medaka (Oryzias latipes) induced by benz[a]pyrene was investigated by using the biological model of spawning Japanese medaka (Oryzias latipes) with the method of intraperitoneal injection, and the real-time PCR was used to detection the mRNA expression of CYP enzymes (CYP1A1, CYP1B, CYP2A, CYP2C, CYP2D, CYP3A) and the GST gene (mGST, GST-a) in the liver medaka. The results showed that the malformation rate of the fertilized eggs of Japanese medaka in the treatment of injection of benzo[a]pyrene which was significantly higher than the DMSO control. The malformation rate in the treatments of tea polyphenols was decreased, the treatments except the lowest dose of tea polyphenols (20μg/g BaP +2μg/g TP) were significantly different compared to the BaP treatment. Real-time quantitative PCR results showed that the benzo[a]pyrene model group slightly induces the CYP1A1, CYP1BCYP2A, CYP2C, CYP2D mRNA expression and significantly inhibits the mGST and GST-a mRNA expression of the female medaka, while tea polyphenols can significantly inhibit the expression CYP1A1 mRNA gene and glutathione-S transferase (GST) gene mGST and GST-a. The antagonistic mechanism of green tea polyphenols on the malformation of the fertilized eggs of Japanese medaka induced by benzo[a]pyrene might be correlated with the inhibition of CYP1A1 mRNA gene expression and the acceleration of the excretion of metabolic product of benzopyrene.

Key words: tea polyphenols, benzo[a]pyrene, malformations, antagonistic

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