Ethmoid bone marrow region modulates lymphoid activation and differentiation with distinct myeloid profile in neuroinflammation
Laaker, C. J.; Kovacs, K. G.; Herbath, M.; Vi, K.; Port, J.; Vrba, S. M.; Ordonez, S. F. W.; Coogan, S.; Priyathilaka, T. T.; Sandor, M.; Fabry, Z.
Show abstract
The skull bone marrow axis has recently emerged as an important source of immune cells during neuroinflammation, including in the experimental autoimmune encephalomyelitis (EAE) , the mouse model of multiple sclerosis. The cribriform plate bone marrow (cpBM), is a portion of the ethmoid bone of the skull of mice, and is positioned next to nasal regions. At the cribriform plate olfactory nerves pass through the skull and recent evidence supports that it represents an important immune niche with links to CSF outflow and connections to cpBM. Previous data supports cellular composition of the ethmoid bone marrow in mice is altered in neuroinflammation suggesting it senses inflammatory cues, but the exact nature of these changes is still unclear. Here using scRNAseq and flow cytometry of the ethmoid bone marrow region we test how the region responds to EAE. In addition we also compare the cpBM region with systemic bone marrow in the femur to understand region specific differences. We report that neuroinflammation creates a regulatory response at these sites and implicates the cpBM in controlling these effects. A better understanding of the cribriform niche may offer new treatments for neuroinflammatory disease
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