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Zinc modulates mRNA levels of cytokines

Bin Bao1, Ananda S Prasad, Frances W J Beck

  • 1Internal Medicine Department, Wayne State University Medical School, Detroit, MI 48201, USA.

American Journal of Physiology. Endocrinology and Metabolism
|June 19, 2003
PubMed

Insights

Zinc deficiency impairs immune cell function, decreasing IL-2 and IFN-gamma in T-helper cells while increasing TNF-alpha, IL-1 beta, and IL-8 in monocytes. Zinc

Area of Science:

  • Immunology
  • Molecular Biology
  • Nutritional Science

Background:

  • Zinc is crucial for cell-mediated immunity.
  • Zinc deficiency impairs immune responses, leading to infections and altered cytokine production.
  • Specific effects of zinc on cytokine gene expression in different immune cell types are not fully understood.

Purpose of the Study:

  • To investigate the impact of zinc deficiency on the expression of key cytokines (IL-2, IFN-gamma, TNF-alpha, IL-1 beta, IL-8) in distinct immune cell lineages.
  • To determine if zinc deficiency affects cytokine gene expression or mRNA stability.
  • To elucidate the cell lineage-specific role of zinc in cytokine regulation.

Main Methods:

  • Utilized HUT-78 (Th0), D1.1 (Th1), and HL-60 (monocyte-macrophage) cell lines.
  • Compared cytokine and mRNA levels in zinc-deficient versus zinc-sufficient cells following specific stimulations (PMA/PHA, PHA/ionomycin).
  • Employed Actinomycin D to assess the effect of zinc on cytokine mRNA stability.

Main Results:

  • Zinc deficiency significantly decreased Interleukin-2 (IL-2) and Interferon-gamma (IFN-gamma) levels and mRNAs in Th0 and Th1 cell lines.
  • Conversely, zinc deficiency elevated Tumor Necrosis Factor-alpha (TNF-alpha), Interleukin-1 beta (IL-1 beta), and Interleukin-8 (IL-8) levels and mRNAs in the monocyte-macrophage cell line.
  • Actinomycin D studies indicated that zinc influences cytokine gene expression rather than mRNA stability.

Conclusions:

  • Zinc positively regulates the gene expression of IL-2 and IFN-gamma in T-helper (Th1) cells.
  • Zinc negatively regulates the gene expression of TNF-alpha, IL-1 beta, and IL-8 in monocyte-macrophage cells.
  • The influence of zinc on cytokine gene expression is specific to the immune cell lineage.

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