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Dietary sulforaphane, a histone deacetylase inhibitor for cancer prevention
Emily Ho1, John D Clarke, Roderick H Dashwood
1Department of Nutrition and Exercise Sciences, Oregon State University, Corvallis OR 97331, USA. emily.ho@oregonstate.edu
Abstract:
The reversible acetylation of histones is an important mechanism of gene regulation. During prostate cancer progression, specific modifications in acetylation patterns on histones are apparent. Targeting the epigenome, including the use of histone deacetylase (HDAC) inhibitors, is a novel strategy for cancer chemoprevention. Recently, drugs classified as HDAC inhibitors have shown promise in cancer clinical trials. We have previously found that sulforaphane (SFN), a compound found in cruciferous vegetables, inhibits HDAC activity in human colorectal and prostate cancer cells. Based on the similarity of SFN metabolites and other phytochemicals to known HDAC inhibitors, we previously demonstrated that sulforaphane acted as an HDAC inhibitor in the prostate, causing enhanced histone acetylation, derepression of P21 and Bax, and induction of cell cycle arrest/apoptosis, leading to cancer prevention. The ability of SFN to target aberrant acetylation patterns, in addition to effects on phase 2 enzymes, may make it an effective chemoprevention agent. These studies are important because of the potential to qualify or change recommendations for high-risk prostate cancer patients and thereby increase their survival through simple dietary choices incorporating easily accessible foods into their diets. These studies also will provide a strong scientific foundation for future large-scale human clinical intervention studies.
Insights
Sulforaphane (SFN), a compound from cruciferous vegetables, acts as a histone deacetylase (HDAC) inhibitor. This dietary compound enhances histone acetylation, potentially preventing prostate cancer by promoting cell cycle arrest and apoptosis.
Area of Science:
- Epigenetics
- Molecular Biology
- Nutritional Biochemistry
Background:
- Histone acetylation is crucial for gene regulation and is altered in prostate cancer.
- Histone deacetylase (HDAC) inhibitors represent a novel strategy for cancer chemoprevention.
- Sulforaphane (SFN), a phytochemical, has demonstrated HDAC inhibitory activity in cancer cells.
Purpose of the Study:
- To investigate the potential of sulforaphane (SFN) as a chemoprevention agent for prostate cancer by targeting aberrant histone acetylation patterns.
- To elucidate the molecular mechanisms by which SFN affects histone acetylation, gene expression, and cell fate in prostate cancer.
Main Methods:
- In vitro studies using human prostate cancer cells to assess SFN's effects on HDAC activity and histone acetylation.
- Analysis of gene expression changes (P21, Bax) in response to SFN treatment.
- Evaluation of SFN's impact on cell cycle progression and apoptosis induction.
Main Results:
- SFN effectively inhibits HDAC activity in prostate cancer cells, leading to increased histone acetylation.
- SFN treatment resulted in the derepression of tumor suppressor genes P21 and Bax.
- SFN induced cell cycle arrest and apoptosis, indicative of its cancer-preventive properties.
Conclusions:
- SFN demonstrates significant potential as a chemoprevention agent for prostate cancer due to its ability to modulate histone acetylation and induce cancer cell death.
- Dietary incorporation of SFN-rich foods may offer a viable strategy for prostate cancer prevention in high-risk individuals.
- These findings provide a scientific basis for future clinical trials investigating SFN in prostate cancer chemoprevention.
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