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. 2020 Oct 22;11:578003. doi: 10.3389/fneur.2020.578003

Figure 2.

Figure 2

Ly6C+ pro-inflammatory monocyte conversion and contribution to ischemic stroke recovery in vivo. After the onset of ischemic stroke, DAMP released by dying neurons activates microglia and astrocytes. C-C motif ligand 2 (CCL2) and C-C motif ligand 5 (CCL5), which are secreted by activated microglia and astrocytes, induce the infiltration of Ly6C+ pro-inflammatory monocytes into the injury site. Infiltrating Ly6C+ monocytes convert into M2 macrophages depending on the presence of Nr4a1 (MONO to MØ). In addition, activated microglia are polarized into M2 macrophages, releasing anti-inflammatory cytokines, resulting in ischemic stroke recovery. However, whether the conversion of Ly6C+ pro-inflammatory monocytes to Ly6C anti-inflammatory monocytes (MONO to MONO) occurs in the brain, attenuating neuroinflammation following ischemic stroke, remains unclear.