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CD8+ T cell contraction is controlled by early inflammation.
Vladimir P Badovinac1, Brandon B Porter, John T Harty
1Department of Microbiology, University of Iowa, Iowa City, Iowa, USA.
Nature Immunology
|July 13, 2004
Summary
Antibiotic treatment in mice prevented the typical contraction of CD8(+) T cells after infection. This resulted in protective memory cells without contraction, indicating early inflammation controls contraction but isn't essential for memory.
Area of Science:
- Immunology
- Microbial Pathogenesis
- T cell biology
Background:
- CD8(+) T cell populations contract significantly after infection, a process crucial for establishing memory.
- The precise factors regulating this contraction remain largely unknown.
- Understanding T cell contraction is key to optimizing adaptive immunity.
Purpose of the Study:
- To investigate the factors controlling CD8(+) T cell contraction post-infection.
- To determine if T cell contraction is essential for generating protective memory cells.
- To explore alternative pathways for generating memory CD8(+) T cells.
Main Methods:
- Mice were treated with antibiotics prior to infection with Listeria monocytogenes.
- Flow cytometry was used to analyze CD8(+) T cell populations and their markers.
- Quantification of immune cell numbers and assessment of protective memory were performed.
Main Results:
- Antibiotic treatment led to CD8(+) T cell numbers similar to controls, but without the typical contraction phase.
- Absence of contraction correlated with reduced early inflammation and interferon-gamma levels.
- An increased fraction of CD8(+) T cells expressed the interleukin-7 receptor in the absence of contraction.
Conclusions:
- Early inflammation, not T cell contraction, is the primary regulator of CD8(+) T cell memory formation.
- Contraction is not a mandatory process for generating protective memory CD8(+) T cells.
- Modulating early inflammatory responses could be a strategy to enhance memory T cell populations.