Modulation of N-methyl-N-nitrosourea induced mammary tumors in Sprague–Dawley rats by combination of lysine, proline, arginine, ascorbic acid and green tea extractReportar como inadecuado




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Breast Cancer Research

, 7:R291

First Online: 31 January 2005Received: 29 September 2004Revised: 25 November 2004Accepted: 20 December 2004

Abstract

IntroductionThe limited ability of current treatments to control metastasis and the proposed antitumor properties of specific nutrients prompted us to examine the effect of a specific formulation nutrient supplement NS of lysine, proline, arginine, ascorbic acid, and green tea extract in vivo on the development of N-methyl-N-nitrosourea MNU-induced mammary tumors in rats.

MethodsA single intraperitoneal dose of MNU was injected into each of 20 female Sprague–Dawley rats aged 50 days to induce tumors. Two weeks after MNU treatment, a time by which the animals had recovered from MNU-induced toxicity, the rats were divided into two groups. Rats in group 1 n = 10 were fed Purina chow diet, whereas those in group 2 n = 10 were fed the same diet supplemented with 0.5% NS. After a further 24 weeks, the rats were killed and tumors were excised and processed.

ResultsNS reduced the incidence of MNU-induced mammary tumors and the number of tumors by 68.4%, and the tumor burden by 60.5%. The inhibitory effect of NS was also reflected by decreased tumor weight; the tumor weights per rat and per group were decreased by 41% and 78%, respectively. In addition, 30% of the control rats developed ulcerated tumors, in contrast to 10% in the nutrient supplemented rats.

ConclusionThese findings suggest that the specific formulation of lysine, proline, arginine, ascorbic acid, and green tea extract tested significantly reduces the incidence and growth of MNU-induced mammary tumors, and therefore has strong potential as a useful therapeutic regimen for inhibiting breast cancer development.

Keywordsantitumor effect mammary tumors N-methyl-N-nitrosourea Sprague–Dawley rats AbbreviationsECMextracellular matrix

EGCGepigallocatechin-3-gallate

MMPmatrix metalloproteinase

MNUN-methyl-N-nitrosourea

NSnutrient supplement.

Electronic supplementary materialThe online version of this article doi:10.1186-bcr989 contains supplementary material, which is available to authorized users.

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Autor: M Waheed Roomi - Nusrath W Roomi - Vadim Ivanov - Tatiana Kalinovsky - Aleksandra Niedzwiecki - Matthias Rath

Fuente: https://link.springer.com/







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