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2004 | 51 | 3 | 733-745
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Can transforming growth factor-β1 and retinoids modify the activity of estradiol and antiestrogens in MCF-7 breast cancer cells?

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EN
Retinoic acid and transforming growth factor-β (TGF-β) affect differentiation, proliferation and carcinogenesis of epithelial cells. The effect of both compounds on the proliferation of cells of the hormone sensitive human breast cancer cell line (ER+) MCF-7 was assessed in the presence of estradiol and tamoxifen. The assay was based on [3H]thymidine incorporation and the proliferative activity of PCNA- and Ki 67-positive cells. The apoptotic index and expression of the Bcl-2 and p53 antigens in MCF-7 cells were also determined. Exogenous TGF-β1 added to the cell culture showed antiproliferative activity within the concentration range of 0.003-30 ng/ml. Irrespective of TGF-β1 concentrations, a marked reduction in the stimulatory action of estradiol (10-9 and 10-8 M) was observed whereas in combination with tamoxifen (10-7 and 10-6 M) only 30 ng/ml TGF-β1 caused a statistically significant reduction to aproximately 30% of the proliferative cells. In further experiments we examined the effect of exposure of breast cancer cells to retinoids in combination with TGF-β1. The incorporation of [3H]thymidine into MCF-7 cells was inhibited to 52 ± 19% (control =100%) by 3 ng/ml TGF-β1, and this dose was used throughout. It was found that addition of TGF-β1 and isotretinoin to the culture did not decrease proliferation, while TGF-β1 and tretinoin at low concentrations (3 × 10-8 and 3 × 10-7 M) reduced the percentage of proliferating cells by aproximately 30% (67±8% and 67±5%, P <0.05 compared to values in the tretinoin group). Both retinoids also led to a statistically significant decrease in the stimulatory effect of 10-9 M estradiol, attenuated by TGF-β1. In addition, the retinoids in combination with TGF-β1 and tamoxifen (10-6 M) caused a further reduction in the percentage of proliferating cells. Immunocytochemical analysis showed that all the examined compounds gave a statistically significant reduction in the percentage of cells with a positive reaction to PCNA and Ki 67 antigen. TGF-β1, isotretinoin and tretinoin added to the culture resulted in the lowest percentage of PCNA positive cells. However, the lowest fraction of Ki 67 positive cells was observed after addition of isotretinoin. The obtained results also confirm the fact that the well-known regulatory proteins Bcl-2 and p53 play an important role in the regulation of apoptosis in the MCF-7 cell line, with lowered Bcl-2 expression accompanying easier apoptotic induction. The majority of the examined compounds act via the p53 pathway although some bypass this important proapoptotic factor.
Publisher

Year
Volume
51
Issue
3
Pages
733-745
Physical description
Dates
published
2004
received
2003-01-02
revised
2003-12-03
accepted
2004-02-26
Contributors
  • Department of Gynaecological Endocrinology, Medical University of Białystok, Białystok, Poland
author
  • Department of Gynaecological Endocrinology, Medical University of Białystok, Białystok, Poland
  • Department of Anatomy, Medical University of Białystok, Białystok, Poland
  • Department of Hematological Diagnostics, Medical University of Białystok, Białystok, Poland
  • Department of Gynaecological Endocrinology, Medical University of Białystok, Białystok, Poland
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bwmeta1.element.bwnjournal-article-abpv51i3p733kz
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