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Multiple defects of immune cell function in mice with disrupted interferon-gamma genes
D K Dalton1, S Pitts-Meek, S Keshav
1Genentech Inc., South San Francisco, CA 94080.
Science (New York, N.Y.)
|March 19, 1993
Summary
Interferon-gamma (IFN-gamma) is crucial for immune defense. Mice lacking IFN-gamma showed impaired macrophage function and susceptibility to infection, highlighting its essential role in the immune system.
Area of Science:
- Immunology
- Cytokine Biology
- Infectious Disease
Background:
- Interferon-gamma (IFN-gamma) is a key cytokine with broad immunomodulatory functions.
- Understanding IFN-gamma's role is vital for immune system research.
Purpose of the Study:
- To investigate the in vivo function of IFN-gamma.
- To determine the consequences of IFN-gamma deficiency on immune responses.
Main Methods:
- Generation of gene-targeted mice lacking functional IFN-gamma.
- Assessment of immune cell function, including macrophages, T cells, and NK cells.
- Evaluation of host defense against Mycobacterium bovis infection.
Main Results:
- IFN-gamma-deficient mice exhibited normal development and health in pathogen-free conditions.
- Deficiency led to impaired macrophage antimicrobial activity and reduced MHC class II expression.
- Mice were susceptible to Mycobacterium bovis infection.
- Splenocytes showed uncontrolled proliferation and enhanced T cell cytolytic activity.
- Reduced natural killer cell activity was observed.
Conclusions:
- IFN-gamma is essential for effective host defense against intracellular pathogens.
- IFN-gamma plays a critical role in macrophage and natural killer cell function.
- The cytokine is indispensable for regulating T cell responses and preventing uncontrolled proliferation.