Inhibition of NMU-induced mammary tumorigenesis by dietary soy

We previously demonstrated that female Sprague–Dawley rats fed AIN-93G diets containing soy protein isolate (SPI +) had lower DMBA-induced mammary tumor incidence than those fed diets containing casein (CAS), due partly to altered Phase I metabolism with soy. Here, we evaluated the tumor protective...

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Veröffentlicht in:Cancer letters 2005-06, Vol.224 (1), p.45-52
Hauptverfasser: Simmen, Rosalia C.M., Eason, Renea R., Till, S. Reneé, Chatman, Leon, Velarde, Michael C., Geng, Yan, Korourian, Sohelia, Badger, Thomas M.
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container_end_page 52
container_issue 1
container_start_page 45
container_title Cancer letters
container_volume 224
creator Simmen, Rosalia C.M.
Eason, Renea R.
Till, S. Reneé
Chatman, Leon
Velarde, Michael C.
Geng, Yan
Korourian, Sohelia
Badger, Thomas M.
description We previously demonstrated that female Sprague–Dawley rats fed AIN-93G diets containing soy protein isolate (SPI +) had lower DMBA-induced mammary tumor incidence than those fed diets containing casein (CAS), due partly to altered Phase I metabolism with soy. Here, we evaluated the tumor protective effects of these same diets to the direct-acting carcinogen N-methyl-nitrosourea (NMU). Tumor incidence was reduced and tumor latency was enhanced, in NMU-administered female rats lifetime exposed to SPI +, relative to the CAS group. Tumor multiplicity did not differ with diet, while tumor grade tended to be more advanced with SPI +. Normal mammary glands of CAS and SPI + tumor-bearing rats had comparable proliferative and apoptotic status. However, mammary expression of HER-2/neu and progesterone receptor (PR) genes was higher for SPI + rats. Moreover, tumored SPI + rats had lower serum progesterone levels than those fed CAS, while serum estrogen did not differ. Serum from tumored SPI + rats had higher apoptotic activity towards mammary epithelial MCF-7 cells, than CAS serum. Thus, dietary soy protects against mammary tumorigenesis induced by a direct-acting carcinogen and alters signaling pathways involving PR and HER-2/neu.
doi_str_mv 10.1016/j.canlet.2004.11.009
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ispartof Cancer letters, 2005-06, Vol.224 (1), p.45-52
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subjects Alkylating Agents - toxicity
Animals
Apoptosis
Breast cancer
Breast Neoplasms - prevention & control
Carcinogens
Cell culture
Cell Proliferation
Chemoprevention
Diet
Disease Models, Animal
DNA repair
Female
Gene expression
Humans
Immunohistochemistry
In Situ Nick-End Labeling
Mammary carcinoma
Mammary Neoplasms, Experimental - chemically induced
Mammary Neoplasms, Experimental - prevention & control
Methylnitrosourea - toxicity
NMU
Progesterone
Proteins
Rats
Receptor, ErbB-2 - biosynthesis
Receptors, Progesterone - biosynthesis
Rodents
Soy proteins
Soybean Proteins - pharmacology
Tumorigenesis
Tumors
title Inhibition of NMU-induced mammary tumorigenesis by dietary soy
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