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Schwabenland, Marius; Salié, Henrike; Tanevski, Jovan; Killmer, Saskia; Lago, Marilyn Salvat; Schlaak, Alexandra Emilia; Mayer, Lena; Matschke, Jakob; Püschel, Klaus; Fitzek, Antonia; Ondruschka, Benjamin; Mei, Henrik E.; Boettler, Tobias; Neumann-Haefelin, Christoph; Hofmann, Maike; Breithaupt, Angele; Genc, Nafiye; Stadelmann, Christine; Saez-Rodriguez, Julio; Bronsert, Peter; Knobeloch, Klaus-Peter; Blank, Thomas; Thimme, Robert; Glatzel, Markus; Prinz, Marco; Bengsch, Bertram
Immunity, 07/2021, Volume: 54, Issue: 7Journal Article
COVID-19 can cause severe neurological symptoms, but the underlying pathophysiological mechanisms are unclear. Here, we interrogated the brain stems and olfactory bulbs in postmortem patients who had COVID-19 using imaging mass cytometry to understand the local immune response at a spatially resolved, high-dimensional, single-cell level and compared their immune map to non-COVID respiratory failure, multiple sclerosis, and control patients. We observed substantial immune activation in the central nervous system with pronounced neuropathology (astrocytosis, axonal damage, and blood-brain-barrier leakage) and detected viral antigen in ACE2-receptor-positive cells enriched in the vascular compartment. Microglial nodules and the perivascular compartment represented COVID-19-specific, microanatomic-immune niches with context-specific cellular interactions enriched for activated CD8+ T cells. Altered brain T-cell-microglial interactions were linked to clinical measures of systemic inflammation and disturbed hemostasis. This study identifies profound neuroinflammation with activation of innate and adaptive immune cells as correlates of COVID-19 neuropathology, with implications for potential therapeutic strategies. Display omitted •Performed detailed molecular and spatial analysis of the COVID-19 brain immune response•Pathognomonic microglial nodules and T cell infiltration are present in COVID-19 brains•Altered microglia-T-cell interactions correlate with systemic measures of inflammation•Vascular leakage is linked with immune activation, ACE2 expression, and viral antigen COVID-19 can cause severe neurological symptoms. By deep spatial analysis of postmortem brain tissue, Schwabenland et al. identify accumulation of distinct microglial and T cell subsets in microglial nodules and the perivasculature. They observe neuroinflammation with axonal damage, virus-associated perivascular inflammation, and compromised blood-brain barrier. This profound neuroinflammation highlights the need for better strategies against this COVID-19 CNS manifestation.
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