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. 2021 Aug 11;9:693342. doi: 10.3389/fcell.2021.693342

FIGURE 11.

FIGURE 11

Schematic model of the interplay between triggering receptor expressed on myeloid cells 2 (TREM2) and Toll-like receptor 4 (TLR4)-induced inflammation after subarachnoid hemorrhage (SAH). The TLR4-induced inflammation suppresses the TREM2 signaling pathway to exacerbate SAH-triggered inflammatory response in microglia. After SAH onset, the activated TLR4 pathway can interfere TREM2 by inhibiting the increment of TREM2 expression and cleaving TREM2 into a secreted form.