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Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
Published on: April 16, 2012
Zinc and inflammatory/immune response in aging.
Sonya Vasto1, Eugenio Mocchegiani, Marco Malavolta
1Immunosenescence Unit, Department of Pathobiology and Biomedical Methodologies, Palermo University, Corso Tukory 211, 90134 Palermo, Italy. s.vasto@unipa.it
Annals of the New York Academy of Sciences
|April 27, 2007
Summary
Chronic inflammation and aging impair immune response due to zinc deficiency. Metallothioneins sequester zinc, reducing its availability and affecting inflammatory pathways, particularly NF-kappaB regulation.
Area of Science:
- Immunology
- Nutritional Science
- Gerontology
Background:
- Chronic inflammation, driven by lifelong antigenic exposure, increases lymphocyte activation and pro-inflammatory cytokine production.
- Zinc metabolism is altered in acute and chronic inflammation, with decreased plasma zinc and intracellular disturbances observed in aging and age-related diseases.
- Dietary shifts in aged individuals, avoiding zinc-rich foods and consuming refined products, exacerbate zinc deficiency.
Purpose of the Study:
- To investigate the role of zinc metabolism in chronic inflammation and aging.
- To elucidate the mechanisms by which zinc deficiency impacts inflammatory and immune responses in the elderly.
- To explore the connection between zinc homeostasis, metallothioneins, NF-kappaB signaling, and age-related diseases.
Main Methods:
- Review of existing literature on zinc metabolism, inflammation, aging, and age-related diseases.
- Analysis of the interplay between pro-inflammatory cytokines (IL-6, TNF-alpha), metallothioneins (MT), and zinc homeostasis.
- Examination of zinc's effect on NF-kappaB signaling pathways, including A20 protein regulation.
Main Results:
- Increased metallothioneins in aging and chronic inflammation sequester intracellular zinc, reducing its availability for antioxidant and anti-inflammatory functions.
- Zinc deficiency impairs the inflammatory and immune response in the elderly by affecting NF-kappaB translocation and pro-inflammatory cytokine regulation.
- Cytokine gene polymorphisms, interacting with dysregulated zinc turnover, may contribute to the development of age-related diseases like atherosclerosis and type 2 diabetes.
Conclusions:
- Zinc deficiency is a significant factor in the impaired immune response observed in aging and chronic inflammatory conditions.
- Metallothionein-mediated zinc sequestration plays a critical role in this deficiency, impacting NF-kappaB signaling.
- Restoring zinc homeostasis could be a potential therapeutic strategy for mitigating inflammation and preventing age-related diseases in susceptible individuals.
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