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. 2021 Dec 15;12:804870. doi: 10.3389/fimmu.2021.804870

Figure 4.

Figure 4

The TLR4/P38MAPK/IL-1β-mediated apoptosis signaling pathway was activated in WPs but not in SPs. (A) The levels of various cytokines in serum and colon tissue measured by ELISA. (B) Representative transmission electron micrographs of colonic crypts from the SP and WP groups. The low magnification image (scale bar, 5 μm; ×3,000 magnification) demonstrates abundant degeneration and the presence of necrotic cells scattered at the bottom of crypts in the WP group. The higher magnification image (scale bar, 1 μm; ×10,000 magnification) shows a typical apoptosis event characterized by fragmented nuclei and leaking of the nuclear mass (arrow). (C–E) The expression of components of the TLR4/P38MAPK/IL-1β signaling pathway and caspase-related proteins in colon tissue were determined by immunoblotting. All data are presented as the means ± SEM, Student’s t-test, *P < 0.05, **P < 0.01; n = 6.