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Inhibitory effect of tea polyphenols on hepatic preneoplastic foci in Wistar rats

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Summary

Tea (Camellia sinensis) is one of the most widely used beverages worldwide and tea consumption has been shown to have an inverse correlation to the incidence of human cancers in epidemiological and experimental studies. In the present study, the protective effects of green tea polyphenols (GTP) and black tea polyphenols (BTP) in Wistar rats were assessed by medium-term bioassay, using altered hepatic foci (AHF) as end point. Animals were exposed to a single dose of diethylnitrosamine (DEN; 200 mg/kg body weight intraperitoneally), and GTP (1%) and BTP (1%) were then administered orally together with 0.05% 2-acetyl aminofluorene (2-AAF) crushed and mixed in the diet for 8 weeks. Numbers of AHF were scored and analyzed by quantitative stereology using the Image analysis system from frozen liver tissue sections. Tea polyphenol supplementation resulted in a significant protection against AHF induction in Wistar rats. In addition, levels of the positive biomarkers: γ-glutamyl transpeptidase and glutathione-S-transferase (placental form) were reduced with GTP and BTP supplementation. Levels of the negative biomarkers adenosine triphosphatase and glucose-6-phosphatase were also restored by GTP and BTP administration. Thus, these results show the hepatoprotective effects of GTP and BTP against DEN- and 2-AAF-induced AHF development.

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Abbreviations

2-AAF:

2-Acetyl aminofluorene

AHF:

Altered hepatic foci

BTP:

Black tea polyphenols

DEN:

Diethylnitrosamine

GGT:

γ-Glutamyl transpeptidase

GTP:

Green tea polyphenols

GST-P:

Glutathione-S-transferase placental form

G6Pase:

Glucose-6-phosphatase

ATPase:

Adenosine triphosphatase

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Acknowledgments

The authors would like to thank Dr Ashwani Kumar, Director, Indian Institute of Toxicology Research (Council of Scientific and Industrial Research, India) for his keen interest in the study and to the Indian Council of Medical Research (India) for providing fellowships to Ms Smita Srivastava and Mr Sahdeo Prasad. The authors would also like to thank Indfrag Limited (Bangalore, India) for generously providing GTP and BTP.

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  1. Proteomics Laboratory, Indian Institute of Toxicology Research, Mahatma Gandhi Marg, Lucknow, 226001, India

    Smita Srivastava, Madhulika Singh, Preeti Roy, Sahdeo Prasad, Jasmine George & Yogeshwer Shukla

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  1. Smita Srivastava
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  2. Madhulika Singh
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Correspondence to Yogeshwer Shukla.

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Srivastava, S., Singh, M., Roy, P. et al. Inhibitory effect of tea polyphenols on hepatic preneoplastic foci in Wistar rats. Invest New Drugs 27, 526–533 (2009). https://doi.org/10.1007/s10637-008-9204-6

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