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Cancer prevention with food factors: alone and in combination
Hajime Ohigashi1, Akira Murakami
1Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan. ohigashi@kais.kyoto-u.ac.jp
Abstract:
Cancer prevention strategies making use of combined agents with distinct molecular mechanisms, rather than individual agents, are considered promising for higher efficacy and lower toxicity. Although there is increasing understanding of the synergistic combinations of synthetic agents, our knowledge regarding such combinations of food factors remains limited. We recently found that free radical generation suppressants from food items in combination with their scavengers at low concentrations exhibited notable synergistic effects in activated leukocytes, whereas combinations of agents with similar modes of action showed additive or antagonistic effects. For example, pound -)-epigallocatechin gallate (EGCG) from green tea has been shown to increase the endotoxin-induced production of proinflammatory mediators such as prostaglandin E(2) and tumor necrosis factor-alpha in RAW264.7 macrophages, whereas the soybean isoflavonoid genistein compensated for these inverse properties of EGCG, leading to marked suppression in combination. The present review briefly highlights the potential effectiveness of combinations of several agents with anti-oxidative and anti-inflammatory properties for cancer preventive strategies.
Insights
Combining food-derived antioxidants and anti-inflammatory agents with distinct mechanisms shows synergistic effects for cancer prevention. These combinations may offer higher efficacy and lower toxicity than single agents.
Area of Science:
- Nutritional science
- Molecular biology
- Cancer research
Background:
- Combined agents with distinct molecular mechanisms are promising for cancer prevention due to higher efficacy and lower toxicity.
- Knowledge of synergistic combinations of food factors for cancer prevention is limited.
- Individual food factors may have opposing effects, necessitating strategic combinations.
Purpose of the Study:
- To review the potential effectiveness of combining food-derived agents with anti-oxidative and anti-inflammatory properties for cancer prevention.
- To highlight synergistic effects observed in combinations of food factors with distinct molecular mechanisms.
Main Methods:
- Review of existing literature on food factor combinations and their effects on cellular processes.
- Analysis of synergistic, additive, and antagonistic effects of combined agents.
- Examination of specific examples like epigallocatechin gallate (EGCG) and genistein.
Main Results:
- Combinations of free radical generation suppressants and scavengers from food exhibited synergistic effects in activated leukocytes at low concentrations.
- Combinations of agents with similar modes of action showed additive or antagonistic effects.
- Epigallocatechin gallate (EGCG) increased pro-inflammatory mediators, while genistein compensated for this effect, leading to suppression in combination.
Conclusions:
- Combinations of food-derived agents with distinct anti-oxidative and anti-inflammatory properties hold significant potential for cancer preventive strategies.
- Synergistic effects are more likely when combined agents possess different molecular mechanisms.
- Further research into strategic food factor combinations could lead to more effective and safer cancer prevention methods.
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