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Role of PPAR-gamma in inflammation. Prospects for therapeutic intervention by food components
1The New Zealand Institute for Plant & Food Research Limited, Palmerston North 4474, New Zealand. hmartin@hortresearch.co.nz
Abstract:
Peroxisome proliferator activated receptor gamma (PPARγ) is a ligand-dependent transcription factor and a member of the nuclear receptor superfamily. Acting as sensors of hormones, vitamins, endogenous metabolites and xenobiotic compounds, the nuclear receptors control the expression of a very large number of genes. PPARγ has been known for some time to regulate adipocyte differentiation, fatty acid storage and glucose metabolism, and is a target of anti-diabetic drugs. More recently, PPARγ has been recognized as playing a fundamentally important role in the immune response through its ability to inhibit the expression of inflammatory cytokines and to direct the differentiation of immune cells towards anti-inflammatory phenotypes. A feature of PPARγ is the structural diversity of its ligands, which encompass endogenous metabolites, dietary compounds and synthetic drugs. The high and increasing incidence of inflammatory and allergic disease, coupled with encouraging results from recent clinical trials, suggest that natural PPARγ agonists found in foods may be beneficial to human health by acting as anti-inflammatory molecules. PPARγ is therefore not only a target of the pharmaceutical industry, but also of great potential interest to the food industry, since it is activated by several natural dietary constituents. The prospects for dietary intervention in inflammatory disease have improved somewhat over the last few years, and are reviewed here.
Insights
Peroxisome proliferator activated receptor gamma (PPARγ) plays a key role in metabolism and immunity. Natural dietary compounds activating PPARγ show promise for managing inflammatory and allergic diseases through diet.
Area of Science:
- Molecular Biology
- Immunology
- Endocrinology
Background:
- Peroxisome proliferator activated receptor gamma (PPARγ) is a nuclear receptor superfamily member regulating gene expression.
- PPARγ is known for roles in adipocyte differentiation, fatty acid storage, and glucose metabolism, and is a target for anti-diabetic drugs.
- Emerging evidence highlights PPARγ's crucial function in immune responses, including inhibiting inflammatory cytokines and promoting anti-inflammatory immune cell phenotypes.
Purpose of the Study:
- To review the role of PPARγ in immune responses and inflammatory diseases.
- To explore the potential of natural PPARγ agonists found in foods as anti-inflammatory agents.
- To discuss the prospects of dietary interventions for inflammatory diseases targeting PPARγ.
Main Methods:
- Review of existing literature on PPARγ function, ligands, and clinical trial data.
- Analysis of the structural diversity of PPARγ ligands, including endogenous metabolites, dietary compounds, and synthetic drugs.
- Evaluation of the therapeutic potential of natural PPARγ agonists in inflammatory and allergic conditions.
Main Results:
- PPARγ activation by diverse ligands, including dietary constituents, influences immune cell differentiation and inflammatory cytokine production.
- Natural PPARγ agonists from food sources demonstrate anti-inflammatory properties.
- Clinical trial results suggest potential benefits of dietary intervention for inflammatory diseases via PPARγ activation.
Conclusions:
- PPARγ is a significant target for both the pharmaceutical and food industries due to its role in inflammation and metabolism.
- Dietary intervention strategies targeting PPARγ hold promise for managing inflammatory and allergic diseases.
- Further research into natural PPARγ agonists could lead to novel therapeutic approaches for inflammatory conditions.
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