A newly discovered memory in our bones: blood stem cells boost immunity by keeping a record of previous infections
A Franco-German research team led by Prof. Michael Sieweke, from the Center for Regenerative Therapies TU Dresden (CRTD) and the Center of Immunology of Marseille Luminy (CNRS, INSERM, Aix-Marseille University), today uncovered a surprising property of blood stem cells: not only do they ensure the continuous renewal of blood cells and contribute to the immune response triggered by an infection, but they can also remember previous infectious encounters to drive a more rapid and more efficient immune response in the future. These findings should have a significant impact on future vaccination strategies and pave the way for new treatments of an underperforming or over-reacting immune system. The results of this research are published in Cell Stem Cell on March 12, 2020. More information
C/EBPβ-Dependent Epigenetic Memory Induces Trained Immunity in Hematopoietic Stem Cells
de Laval B., Maurizio J., Kandalla P K., Brisou G., Simonnet L., Huber C., Gimenez G., Matcovitch-Natan O., Reinhardt S., David E., Mildner A., Leutz A., Nadel B., Bordi C., Amit I., Sarrazin S.*,†., Sieweke M H.*,†. Cell Stem Cell, 2020 , pii: S1934-5909(20)30017-5, PMID: 32169166
When Stress Weakens the Immune Defenses
In previous years, various studies have established a link between psychological stress and reduced immune defenses, but the mechanisms involved remained poorly elucidated. Sophie Ugolini, Inserm Research Director at the Center of Immunology Marseille-Luminy, and her colleagues at CNRS and Aix-Marseille Université have recently shown that such a link is to a large extent mediated by a type of receptor that binds to stress hormones: the β2-adrenergic receptor. Their findings have been published in Journal of Experimental Medicine. More information
β2-adrenergic signals downregulate the innate immune response and reduce host resistance to viral infection Wieduwild E, Girard-Madoux MJ, Quatrini L, Laprie C, Chasson L, Rossignol R, Bernat C, Guia S, Ugolini S. J Exp Med., 2020 , 217(4), PMID: 32045472
At the crossroads of biology and medicine, immunology is a scientific discipline that focuses on the operating mechanisms of the immune system. Appeared early in the evolution, this system enables living organisms to defend themselves against pathogens or their own components when they are altered. It involves a large number of cells whose capacity for cooperation, recognition and memory are far from having revealed all their secrets.
ERC "Advanced Grants"
Bernard Malissen – 2018 – Basilic Projet
Michael Sieweke – 2016 – Macrophage Aging and Rejuvenation
Eric Vivier – 2016 – Targeting Innate Lymphoid Cells
Bernard Malissen – 2012 – Integrative biology of T cells and dendritic cells in vivo
Eric Vivier – 2010 – The Immune Function of Natural Killer
ERC "Consolidator Grants"
Sophie Ugolini – 2014 – Neural regulation of immunity
Marc Bajénoff – 2014 – Immunobiology of lymphoid stromal cells
ERC "Starting Grants"
Marc Dalod – 2011 – Harnessing systems immunology to unravel dendritic cell subset biology
Toby Lawrence - 2010 – Targeting tumor associated macrophages in Cancer
ERC "Proof of Concept (PoC) Grant"
Eric Vivier - 2019 - MInfla-Tilc
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