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. 2019 May 28;10:579. doi: 10.3389/fphar.2019.00579

FIGURE 9.

FIGURE 9

Schematic diagram of the interaction between PB-MSCs and macrophages. Quiescent MSCs inhabit the hematopoietic niche, which is mainly composed of osteoblasts and the vascular network. In the process of mobilization by G-CSF combined with AMD3100, BM-MSCs detached from the niche because of block of SDF-1α/CXCR4 axis by AMD3100 to cut off SDF-1α binding into CXCR4, and G-CSF to reduce SDF-1α levels in the niche (Petit et al., 2002; Tang et al., 2011; Hoggatt et al., 2018). Mobilized BM-MSCs enter peripheral blood, functioning as PB-MSCs. PB-MSCs contributed to the polarization of M1 toward M2 type in the inflammatory sites though IL1RA, which were associated with NF-κB signaling pathway.