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Gene expression in IFN-gamma-activated murine macrophages.

C A Pereira1, M Modolell, J R Frey

  • 1Laboratório de Imunologia Viral, Instituto Butantan, São Paulo, SP, Brazil. grugel@butantan.gov.br

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|November 24, 2004
PubMed
Summary

Interferon-gamma (IFN-gamma) activation of macrophages from different mouse strains reveals distinct gene expression patterns. This differential response impacts antiviral states and highlights genetic background

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Macrophages are crucial immune cells involved in both innate and adaptive immunity.
  • Interferon-gamma (IFN-gamma) is a key cytokine that activates macrophages, influencing their function.
  • Murine hepatitis virus 3 (MHV3) infection in mice provides a model to study macrophage antiviral responses.

Purpose of the Study:

  • To investigate the differential gene expression patterns in macrophages from A/J and BALB/c mice upon IFN-gamma activation.
  • To identify genes regulated by IFN-gamma that contribute to distinct antiviral states.
  • To understand how genetic background influences macrophage molecular responses to viral infection.

Main Methods:

  • Macrophages were derived from A/J and BALB/c mice.

Related Experiment Videos

  • Macrophages were activated with IFN-gamma.
  • Messenger RNA (mRNA) accumulation was evaluated using cDNA hybridization to identify differentially expressed genes.
  • Gene expression patterns were compared between non-activated and activated macrophages of both mouse strains.

    • Main Results:

    • IFN-gamma activation induced distinct gene expression profiles in A/J and BALB/c mouse macrophages.
    • A/J macrophages showed 267 upregulated and 266 downregulated genes, while BALB/c macrophages showed 297 upregulated and 58 downregulated genes.
    • Genes involved in diverse biological functions, including enzymatic reactions, nucleic acid metabolism, protein handling, cytoskeleton organization, and immune responses, were differentially regulated.
    • A downregulation of the MHV3 receptor gene was observed specifically in IFN-gamma-activated macrophages from resistant mice.

    Conclusions:

    • The genetic background of mice significantly influences the molecular response of macrophages to IFN-gamma activation.
    • Differential gene regulation in macrophages contributes to varying antiviral states and susceptibility to viral infections.
    • These findings provide a molecular basis for understanding macrophage heterogeneity and host-pathogen interactions, facilitating further research into macrophage biology and antiviral immunity.