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Inhibition of Adenoma Progression to Adenocarcinoma in a 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-induced Lung Tumorigenesis Model in A/J Mice by Tea Polyphenols and Caffeine

Inhibition of Adenoma Progression to Adenocarcinoma in a 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-induced Lung Tumorigenesis Model in A/J Mice by Tea Polyphenols and Caffeine

Gang Lu, Jie Liao, Guangyu Yang, Kenneth R Reuhl, Xingpei Hao, Chung S Yang

Cancer Res. 2006 Dec 1;66(23):11494-501.

PMID: 17145898

Abstract:

The present study investigated the inhibitory effects of Polyphenon E [a standardized green tea polyphenol preparation containing 65% (-)-epigallocatechin-3-gallate] and caffeine on 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)-induced lung tumor progression from adenoma to adenocarcinoma. Female A/J mice were treated with a single dose of NNK (103 mg/kg body weight, i.p.) and kept for 20 weeks for the mice to develop lung adenomas. The mice were then given a solution of 0.5% Polyphenon E or 0.044% caffeine as the sole source of drinking fluid until week 52. Both treatments significantly decreased the number of visible lung tumors. Histopathologic analysis indicated that Polyphenon E administration significantly reduced the incidence (by 52%) and multiplicity (by 63%) of lung adenocarcinoma. Caffeine also showed marginal inhibitory effects in incidence and multiplicity of adenocarcinoma (by 48% and 49%, respectively). Markers of cell proliferation, apoptosis, and related cell signaling were studied by immunohistochemistry, and the labeling index and staining intensity were quantified by the Image-Pro system. Polyphenon E and caffeine treatment inhibited cell proliferation (by 57% and 50%, respectively) in adenocarcinomas, enhanced apoptosis in adenocarcinomas (by 2.6- and 4-fold, respectively) and adenomas (both by 2.5-fold), and lowered levels of c-Jun and extracellular signal-regulated kinase (Erk) 1/2 phosphorylation. In the normal lung tissues, neither agent had a significant effect on cell proliferation or apoptosis. The results show that tea polyphenols (and perhaps caffeine) inhibit the progression of NNK-induced lung adenoma to adenocarcinoma. This effect is closely associated with decreased cell proliferation, enhanced apoptosis, and lowered levels of c-Jun and Erk1/2 phosphorylation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP64091914-A	4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) solution		64091-91-4	Price

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