Related Experiment Video
Updated: Feb 11, 2026
Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
Withaferin A and sulforaphane regulate breast cancer cell cycle progression through epigenetic mechanisms
Kendra J Royston1, Bidisha Paul2, Susan Nozell3
1Department of Biology, University of Alabama at Birmingham, 1300 University Boulevard, 175 Campbell Hall, Birmingham, AL 35294, USA; Comprehensive Cancer Center, University of Alabama Birmingham, 1802 6th Avenue South, Birmingham, AL 35294, USA.
Abstract:
Little is known about the effects of combinatorial dietary compounds on the regulation of epigenetic mechanisms involved in breast cancer prevention. The human diet consists of a multitude of components, and there is a need to elucidate how certain compounds interact in collaboration. Withaferin A (WA), found in the Indian winter cherry and documented as a DNA methyltransferase (DNMT) inhibitor, and sulforaphane (SFN), a well-known histone deacetylase (HDAC) inhibitor found in cruciferous vegetables, are two epigenetic modifying compounds that have only recently been studied in conjunction. The use of DNMT and HDAC inhibitors to reverse the malignant expression of certain genes in breast cancer has shown considerable promise. Previously, we found that SFN + WA synergistically promote breast cancer cell death. Herein, we determined that these compounds inhibit cell cycle progression from S to G2 phase in MDA-MB-231 and MCF-7 breast cancer. Furthermore, we demonstrate that this unique combination of epigenetic modifying compounds down-regulates the levels of Cyclin D1 and CDK4, and pRB; conversely, the levels of E2F mRNA and tumor suppressor p21 are increased independently of p53. We find these events coincide with an increase in unrestricted histone methylation. We propose SFN + WA-induced breast cancer cell death is attributed, in part, to epigenetic modifications that result in the modulated expression of key genes responsible for the regulation of cancer cell senescence.
Insights
Combinatorial dietary compounds, Withaferin A (WA) and sulforaphane (SFN), synergistically induce breast cancer cell death by altering epigenetic mechanisms. This combination inhibits cell cycle progression and modulates key gene expression, offering potential for cancer prevention.
Area of Science:
- Epigenetics
- Cancer Biology
- Nutritional Science
Background:
- Dietary compounds can influence epigenetic mechanisms relevant to cancer prevention.
- Withaferin A (WA) is a DNA methyltransferase (DNMT) inhibitor, and sulforaphane (SFN) is a histone deacetylase (HDAC) inhibitor.
- Investigating the combined effects of DNMT and HDAC inhibitors is crucial for understanding synergistic anti-cancer properties.
Purpose of the Study:
- To determine the effects of combined WA and SFN on breast cancer cell cycle progression and gene expression.
- To elucidate the epigenetic modifications induced by the SFN + WA combination.
- To explore the potential of these compounds in breast cancer prevention strategies.
Main Methods:
- Treatment of MDA-MB-231 and MCF-7 breast cancer cells with SFN and WA.
- Cell cycle analysis to assess progression from S to G2 phase.
- Quantitative analysis of key cell cycle regulatory proteins (Cyclin D1, CDK4, pRB, E2F, p21) and histone methylation levels.
Main Results:
- SFN + WA synergistically inhibit breast cancer cell cycle progression from S to G2 phase.
- The combination down-regulates Cyclin D1, CDK4, and pRB, while up-regulating E2F mRNA and p21.
- These molecular changes are associated with increased histone methylation and contribute to cancer cell senescence.
Conclusions:
- The combination of Withaferin A and sulforaphane induces breast cancer cell death through epigenetic modifications.
- Modulation of cell cycle regulators and tumor suppressor genes by SFN + WA is a key mechanism.
- This synergistic effect highlights the potential of combinatorial dietary compounds in breast cancer prevention.
Related Concept Videos
01:46Epigenetic Regulation
01:37Epigenetic Regulation
X-chromosome...
02:53Adaptive Mechanisms in Cancer Cells
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
03:03mTOR Signaling and Cancer Progression
The mTOR pathway or the...
01:22Hormonal Regulation of the Menstrual Cycle
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
02:58Regulated Protein Degradation
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...