Brain macrophages acquire distinct transcriptomes prior to demyelination in multiple sclerosis
Miedema, A.; Gerrits, E.; Brouwer, N.; Jiang, Q.; Kracht, L.; Meijer, M.; Nutma, E.; Peferoen-Baert, R.; Pijnacker, A.; Wesseling, E.; Wijering, M.; Gabius, H.-J.; Amor, S.; Kooistra, S.; Eggen, B.
Show abstract
Multiple sclerosis (MS) is a disease of the central nervous system (CNS) that is characterized by inflammation and focal areas of demyelination, ultimately resulting in axonal degradation and neuronal loss. Several lines of evidence point towards a role for microglia and other brain macrophages in disease initiation and progression, but exactly how lesion formation is triggered is currently unknown. Here, we characterized early changes in MS brain tissue through transcriptomic analysis of normal appearing white matter (NAWM). We found that NAWM was characterized by enriched expression of genes associated with inflammation and cellular stress derived from brain macrophages. Single cell RNA sequencing confirmed an early stress response in brain macrophages in NAWM and identified specific macrophage subsets that associate with different stages of demyelinating lesions. These early changes associated with lesion development in MS brain tissue may provide therapeutic targets to limit lesion progression and demyelination.
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