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How Infection History Shapes the Immune System: Pathogen-induced Changes in Regulatory T Cells

Periodic Reporting for period 3 - Immune Regulation (How Infection History Shapes the Immune System: Pathogen-induced Changes in Regulatory T Cells)

Reporting period: 2019-06-01 to 2020-11-30

Studying host-pathogen interactions by focusing on the interaction of a single pathogen with the host has defined our understanding of these events and the insights gained form the basis for the therapeutic and vaccination strategies we use today. However, people become infected with multiple pathogens throughout their lifetime, at times even simultaneously. Still, it is largely unknown how the immune response to one pathogen alters the body’s ability to respond to a second infectious agent or the susceptibility to autoimmunity or cancer. This project addresses this question by focusing on infection-induced changes in regulatory T cells (Tregs) as they may lead to biased suppression and changes in the nature of subsequent immune responses. Our efforts focus on two areas: In a first part, we use single cell RNA-Seq to address how infections shape the Treg compartment by defining the specialized Treg subsets generated during polarized infectious settings and analyzing how they interact with effector T cells. Based on the depth of information we expect to obtain from this approach, we envisage finding thus far unappreciated interactions and functions of Tregs in the course of an immune response. The second part investigates how an altered Treg compartment affects disease susceptibility. In this context, we also address stability and persistence of pathogen-induced changes in the Treg compartment. Collectively the proposed experiments will allow us to start addressing how preceding infections affect disease susceptibility. Deciphering how infection history shapes the Treg compartment and how this affects susceptibility to future challenges will lay the groundwork for addressing this question more broadly in the future and as such will likely have a transformative impact on the field.
We have completed our analysis of the specialized Treg subsets in the first infectious setting and are now verifying the results in vivo.
In the second part we have made good progress in analyzing the memory and stability aspect of regulatory T cell biology as well as immune responses in mice with an altered regulatory compartment and see interesting changes in disease susceptibility.
We have analyzed the regulatory T cells arising in the context of a polarized infection to an unprecedented depth and have found evidence for thus far unknown specific suppressive mediators employed by regulatory T cells.
Our analysis of Treg memory and the long-term pathogen-induced changes in the regulatory compartment has revealed new perspectives and potential functional roles for regulatory T cells that could have far-reaching implication for a wide range of diseases, including chronic infections, transplantations and autoimmunity.
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