Background:HMGB1 is a ubiquitous nucleoprotein with immune-regulatory properties following cellular secretion or release in sterile and infectious inflammation. Stool and serum HMGB1 levels correlate with colitis severity and colorectal cancer (CRC) progression, yet recent reports indicated HMGB1 to mainly operate as an intracellular determinant of enterocyte fate during colitis, and investigations into the roles of HMGB1 in CRC are lacking. Using mice with conditional HMGB1-knockout in enterocytes (Hmgb1ΔIEC) and myeloid cells (Hmgb1ΔLysM), respectively, we explored functions of HMGB1 in pathogenetically diverse contexts of colitis and colitis-associated CRC.
Results:HMGB1 is overexpressed in human inflammatory bowel disease and gastrointestinal cancers, and HMGB1 protein localizes in enterocytes and stromal cells in colitis and CRC specimens from humans and rodents. As previously described, enterocyte HMGB1 deficiency aggravates severe chemical-induced intestinal injury, but not Citrobacter rodentium or T cell transfer colitis in mice. HMGB1-deficient enterocytes and organoids do not exhibit deviant apoptotic or autophagic activity, altered proliferative or migratory capacity, abnormal intestinal permeability or aberrant DSS-induced organoid inflammation in vitro. Instead, we observed altered in vivo-reprogramming of both intestinal epithelia and infiltrating myeloid cells in Hmgb1ΔIEC early during colitis, suggesting HMGB1-mediated paracrine injury signaling. Hmgb1ΔIEC had higher CRC burden than wildtypes in the Apc+/min model, whereas inflammatory CRC was attenuated in Hmgb1ΔLysM. Cellular and molecular phenotyping of Hmgb1ΔIEC and Hmgb1ΔLysM cancers indicates context-dependent transcriptional modulation of immune signaling and extracellular matrix remodeling via HMGB1.
Conclusion:Enterocytes and myeloid cells context-dependently regulate host responses to severe colitis and maladaptive intestinal wound healing via HMGB1.

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