Comparative effects of dimethylbenz(a)anthacene and a 15% olive-oil diet on cellular components and expression of apoptosis-related proteins in the spleen and mammary gland tumors of rats

  • Authors: G. Kossoy, G. Yarden, H. Ben-Hur, N. Kossoy, A. Stark, Z. Madar, I. Zusman
  • View Affiliations

  • Published online on: Thursday, March 1, 2001
  • Pages: 435-439
  • DOI: 10.3892/or.8.2.435

Abstract

We compared effects of a high fat diet and a carcinogen on cellular elements of the spleen and mammary gland tumors in rats. Animals were fed a 15% olive-oil diet and a group of them were exposed to a carcinogen, dimethylbenz(a)antracne (DMBA), in two doses of 10 mg/rat. Results of the experiments were evaluated after 4 months. We studied changes in the areas of different zones of the spleen related to production of B and T lymphocytes and also the number of cells in the spleen and tumors with positive reaction to receptors related to manifestation of apoptosis (FasL and p53) and receptors related to inhibition of apoptosis (bcl-2). In the spleen, dietary fats as well as DMBA alone decreased the zones related to production of B lymphocytes and increased the number of T lymphocytes. The combined effect of a carcinogen and a high fat diet manifested in an increase in the number of lymphoid cells and macrophages. In tumors from rats fed a low-fat diet, an extremely high number of lymphoid cells was seen in the border of tumors with T cell killers as a main component of these infiltrates. In tumors from rats fed a 15% olive-oil diet, the main component of the infiltrates were macrophages. High levels of p53+ and bcl-2+ cells were found in the spleen of rats exposed to a carcinogen. The combined effect of a carcinogen and the 15% olive-oil diet inhibited production of FasL and p53 receptors and stimulated synthesis of bcl-2 protein. In tumors, a carcinogen alone stimulated the high expression of FasL and p53 proteins, but in combination with the 15% olive-oil diet synthesis of these receptors decreased while production of bcl-2 protein increased sharply. This observation may serve as an additional proof of tumor-promoter effects of a high fat diet.
Journal Cover

March 2001
Volume 8 Issue 2

Print ISSN: 1021-335X
Online ISSN:1791-2431

2012 Impact Factor: 2.297
Ranked #36/196 Oncology
(total number of cites)

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
APA
Kossoy, G., Yarden, G., Ben-Hur, H., Kossoy, N., Stark, A., Madar, Z., & Zusman, I. (2001). Comparative effects of dimethylbenz(a)anthacene and a 15% olive-oil diet on cellular components and expression of apoptosis-related proteins in the spleen and mammary gland tumors of rats. Oncology Reports, 8(2), 435-439.
MLA
Kossoy, Yarden, Ben-Hur, Kossoy, Stark, Madar, and I. Zusman. "Comparative effects of dimethylbenz(a)anthacene and a 15% olive-oil diet on cellular components and expression of apoptosis-related proteins in the spleen and mammary gland tumors of rats." Oncology Reports Oncology Reports 8.2 (2001): 435-439.
Chicago
Kossoy, Yarden, Ben-Hur, Kossoy, Stark, Madar, and I. Zusman. "Comparative effects of dimethylbenz(a)anthacene and a 15% olive-oil diet on cellular components and expression of apoptosis-related proteins in the spleen and mammary gland tumors of rats." Oncology Reports Oncology Reports 8 no. 2 (2001): 435-439.