Corinne Benakis, Alba Simats, Sophie Tritschler, Steffanie Heindl, Simon Besson-Girard, Gemma Llovera, Kelsey Pinkham, Anna Kolz, Alessio Ricci, Fabian J Theis, Stefan Bittner, Özgün Gökce, Anneli Peters, Arthur Liesz
Neuroinflammation after stroke is characterized by the activation of resident microglia and the invasion of circulating leukocytes into the brain. Although lymphocytes infiltrate the brain in small number, they have been consistently demonstrated to be the most potent leukocyte subpopulation contributing to secondary inflammatory brain injury. However, the exact mechanism of how this minimal number of lymphocytes can profoundly affect stroke outcome is still largely elusive. Here, using a mouse model for ischemic stroke, we demonstrated that early activation of microglia in response to stroke is differentially regulated by distinct T cell subpopulations - with TH1 cells inducing a type I INF signaling in microglia and regulatory T cells (TREG ) cells promoting microglial genes associated with chemotaxis...
December 13, 2022: ELife