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Published on: November 16, 2016
IL-2-dependent NK cell responses discovered in virus-infected beta 2-microglobulin-deficient mice
1Division of Biology and Medicine, Brown University, Providence, RI 02912.
Journal of Immunology (Baltimore, Md. : 1950)
|December 15, 1994
Summary
Natural killer (NK) cells show enhanced activity against lymphocytic choriomeningitis virus in CD8+ T cell-deficient mice, driven by interleukin-2 (IL-2). This reveals a novel IL-2-dependent pathway for NK cell activation and expansion.
Area of Science:
- Immunology
- Virology
- Cellular Biology
Background:
- CD8+ T cells typically regulate immune responses.
- Natural killer (NK) cells are crucial for innate immunity against viral infections.
- The interplay between CD8+ T cells and NK cells during viral infections is not fully understood.
Purpose of the Study:
- To investigate NK cell responses in the absence of CD8+ T cells during lymphocytic choriomeningitis virus (LCMV) infection.
- To elucidate the mechanisms underlying NK cell activation and expansion in this context.
- To explore the potential networking between T and NK cells.
Main Methods:
- Utilized beta 2-microglobulin-negative (beta 2-m-/-) mice, which lack CD8+ T cells, and anti-CD8-treated C57BL/6 mice.
- Assessed splenic NK cell activity, cell numbers, and activation markers (NK1.1+, CD3-).
- Investigated the role of interleukin-2 (IL-2) and its receptor (IL-2R) in NK cell responses, including experiments with IL-2 knockout mice.
Main Results:
- Significantly elevated splenic NK cell activity was observed in CD8+ T cell-deficient mice on day 7 post-infection.
- Enhanced NK cell responses were associated with increased numbers of activated NK1.1+CD3- cells.
- NK cell activation in beta 2-m-/- mice was IL-2 dependent, requiring IL-2 production and high-affinity IL-2R expression, and was sensitive to cyclosporin A.
Conclusions:
- NK cells can be activated and expanded via an IL-2-dependent pathway.
- These NK cell responses are primarily observed in the absence of CD8+ T lymphocytes.
- A model of networking between T and NK cells in response to viral infections is proposed, highlighting the regulatory role of CD8+ T cells.
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