Related Experiment Video
Updated: Jun 21, 2026

Real-time Measurement of Epithelial Barrier Permeability in Human Intestinal Organoids
Published on: December 18, 2017
Co-treatment with deoxycholic acid and azoxymethane accelerates secretion of HMGB1 in IEC6 intestinal epithelial
1Department of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Objectives:
High-mobility group box 1 (HMGB1) is a nuclear protein that acts as a ligand of the receptor for advanced glycation end products (RAGE) and its expression enhances progression of cancer. However, the mechanism underlying HMGB1 secretion is still unclear. In this study, we examined the effect of deoxycholic acid (DCA), a promoter of colon carcinogenesis, on HMGB1 secretion.
Materials And Methods:
We used an in vitro transformation model comprised of IEC6 intestinal epithelial cells treated with azoxymethane (AOM) and/or DCA. HMGB1 expression and secretion were examined by Western and Northern blot analyses, and ELISA. Intracellular translocation of HMGB1 was examined by protein fractionation.
Results:
AOM + DCA-treated IEC6 cells showed upregulation of HMGB1 mRNA expression and increased level of HMGB1 protein in culture medium, but decreased level of HMGB1 protein in the nucleus. AOM + DCA treatment increased level of histone H4 acetylation, which induced translocation of HMGB1 from the nucleus to the cytoplasm and increased HMGB1 secretion. Leptomycin B inhibited extranuclear translocation and secretion of the HMGB1 protein.
Conclusion:
These findings suggest that DCA affects intracellular localization and secretion of HMGB1.
Related Concept Videos
Drugs for Treatment of Constipation-Predominant IBS
Drugs for Treatment of Ulcerative Colitis in IBD
Drugs for Treatment of Diarrhea-Predominant IBS
Two specific drugs used in the treatment are alosetron (Lotronex) and eluxadoline (Viberzi). Alosetron, a 5-HT3 antagonist, works by slowing the movement of stools in the gut, reducing bowel...
Drugs Affecting GI Tract Motility: Adsorbents as Antidiarrheal Agents
Adsorbents...

