Treatment effect of TMSCs in chronic murine colitis model. (A) In the chronic colitis model, the macroscopic DAI scores were significantly lower in the TMSC-treated group compared to the DSS + PBS group (p < 0.001). (B) Body weight loss (%) in the TMSC-treated group was significantly lower than in the DSS + PBS group (-18.8 ± 25.1 vs. 7.6 ± 14.0, p < 0.001). (C) In the TMSC-treated group, DSS-induced colon shortening was significantly decreased compared to the DSS+PBS group (68.0 ± 3.4 vs. 81.5 ± 2.9, p = 0.0148). (D) The levels of pro-inflammatory cytokines, including IL-1β and IL-17, were significantly decreased in the TMSC-treated group compared with the colitis control group (p = 0.028 and p = 0.041, respectively). DSS, dextran sulfate sodium; PBS, phosphate-buffered saline; TMSC, tonsil-derived mesenchymal stem cell; DAI, disease activity index.