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Molecular basis for chemoprevention by sulforaphane: a comprehensive review
1Phytochemicals and Health Programme, Institute of Food Research, Colney Lane, Norwich, NR4 7UA UK.
Abstract:
The consumption of cruciferous vegetables has long been associated with a reduced risk in the occurrence of cancer at various sites, including the prostate, lung, breast and colon. This protective effect is attributed to isothiocyanates present in these vegetables, and sulforaphane (SF), present in broccoli, is by far the most extensively studied to uncover the mechanisms behind this chemoprotection. The major mechanism by which SF protects cells was traditionally thought to be through Nrf2-mediated induction of phase 2 detoxification enzymes that elevate cell defense against oxidative damage and promote the removal of carcinogens. However, it is becoming clear that there are multiple mechanisms activated in response to SF, including suppression of cytochrome P450 enzymes, induction of apoptotic pathways, suppression of cell cycle progression, inhibition of angiogenesis and anti-inflammatory activity. Moreover, these mechanisms seem to have some degree of interaction to synergistically afford chemoprevention.
Insights
Sulforaphane (SF) from broccoli offers cancer protection through multiple mechanisms beyond Nrf2 induction. These pathways work together to enhance chemoprevention against various cancers.
Area of Science:
- Nutritional Science
- Molecular Biology
- Cancer Research
Background:
- Cruciferous vegetables contain isothiocyanates, linked to reduced cancer risk.
- Sulforaphane (SF) in broccoli is a key compound studied for its chemoprotective effects.
Purpose of the Study:
- To explore the multifaceted mechanisms of sulforaphane (SF)-mediated chemoprevention.
- To investigate SF's effects beyond the traditional Nrf2 pathway.
Main Methods:
- Review of existing literature on SF's cellular mechanisms.
- Analysis of studies investigating SF's impact on detoxification, apoptosis, cell cycle, angiogenesis, and inflammation.
Main Results:
- SF activates multiple cellular defense pathways, not solely Nrf2-mediated detoxification.
- SF suppresses cytochrome P450 enzymes, induces apoptosis, and inhibits cell cycle progression.
- SF also exhibits anti-angiogenic and anti-inflammatory activities.
Conclusions:
- SF employs a complex, synergistic network of mechanisms for cancer chemoprevention.
- Understanding these diverse pathways is crucial for optimizing SF's therapeutic potential.
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