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Interferon gamma derived from CD4(+) T cells is sufficient to mediate T helper cell type 1 development
A E Wakil1, Z E Wang, J C Ryan
1Department of Medicine and the Department of Microbiology/Immunology, University of California San Francisco, San Francisco, California 94143, USA.
The Journal of Experimental Medicine
|November 6, 1998
Summary
Interferon gamma (IFN-gamma) from innate immune cells is not required for T helper type 1 (Th1) cell development. Activated T cells produce their own IFN-gamma to maintain Th1 cell differentiation and pathogen control.
Area of Science:
- Immunology
- Cellular Biology
Background:
- Interferon gamma (IFN-gamma) is crucial for T helper type 1 (Th1) cell differentiation.
- IFN-gamma from innate immune cells, like natural killer (NK) cells, was thought to be essential for Th1 development in vivo.
Purpose of the Study:
- To investigate the necessity of exogenous IFN-gamma from non-T cells for Th1 cell differentiation.
- To determine if endogenous IFN-gamma produced by T cells is sufficient for Th1 responses.
Main Methods:
- Utilized T cell and IFN-gamma doubly deficient mice.
- Reconstituted mice with wild-type CD4(+) T cells or IFN-gamma-deficient CD4(+) T cells.
- Challenged mice with pathogens (Leishmania major or Listeria monocytogenes) to elicit varying levels of IL-12.
Main Results:
- Th1 cells developed effectively regardless of IFN-gamma presence in non-T cells.
- Absence of IFN-gamma from T cells prevented control of Leishmania major infection.
- Endogenous IFN-gamma produced by T cells was sufficient for maintaining IL-12 responsiveness and Th1 differentiation.
Conclusions:
- Exogenous IFN-gamma from innate immune cells is not required for Th1 cell development.
- Activated T cells can autonomously sustain Th1 responses through endogenous IFN-gamma production.
- This finding highlights the self-sufficiency of T cells in driving Th1-mediated immunity.