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Cytotoxic activity and IL-1 production in mice infected with Aspergillus niger
N Benedetto1, P Sabatini, E Galdiero
1Istituto di Microbiologia, I Facoltà di Medicina e Chirurgia, Università di Napoli, Italy.
Abstract:
In this report, we demonstrate an interaction between macrophages and T lymphocytes during A. nigr infection. Supernatants obtained after 48 hrs adherence of infected peritoneal macrophages were able to increase the cytotoxicity of T lymphocytes. Our results also indicate that macrophage supernatant (MS) from mice, in the first 5 days after challenge, is more active on T cell than MS produced later. Splenic T cells activated by IL-1 from mice at 5 days of infection show a significantly increased cytotoxicity, at 10 days after challenge, the cytotoxicity of T cells activated by IL-1 did not significantly differ from non-activated T cells.
Insights
Macrophages and T lymphocytes interact during Aspergillus niger infection. Infected macrophage supernatants boost T cell cytotoxicity, particularly in the early stages of infection, highlighting a critical immune response window.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Macrophages and T lymphocytes are key immune cells.
- Aspergillus niger is a fungal pathogen.
- Immune cell interactions are crucial for infection control.
Purpose of the Study:
- To investigate the interaction between macrophages and T lymphocytes during Aspergillus niger infection.
- To determine the effect of macrophage-derived factors on T cell activity.
Main Methods:
- Culturing infected peritoneal macrophages.
- Collecting and applying macrophage supernatants (MS) to T lymphocytes.
- Assessing T cell cytotoxicity using IL-1 activation.
- Comparing T cell activity at different time points post-infection.
Main Results:
- Supernatants from infected macrophages enhanced T lymphocyte cytotoxicity.
- Macrophage supernatant (MS) collected within the first 5 days post-infection showed higher activity.
- Splenic T cells activated by IL-1 at 5 days post-infection exhibited significantly increased cytotoxicity.
- At 10 days post-infection, IL-1 activated T cell cytotoxicity did not differ significantly from non-activated cells.
Conclusions:
- Macrophages play a role in modulating T cell responses during Aspergillus niger infection.
- The timing of macrophage activation influences their ability to enhance T cell cytotoxicity.
- Early-stage macrophage-T cell interactions are critical for mounting an effective immune response against Aspergillus niger.