The prevalence of inflammatory bowel disease (IBD) is increasing worldwide, and the key risk factor is high sugar diet. The objective of this study was to investigate anti-inflammatory effects of turanose on IBD in a dextran sulfate sodium (DSS)-induced colitis mouse model. An amylosucrase from Neisseria sicca (NsiAS) was newly identified and successfully expressed. This enzyme exhibited optimal activity at 45 °C and pH 8.5. By utilizing this recombinant enzyme expressed in the E. coli host, turanose yield maximally reached 47% from 2.0 M sucrose. Colitis was induced with two 5-d cycles of 2.5% DSS in drinking water with a 10-d inter-cycle interval. Mice were fed AIN93G diet with 25% and 50% turanose replacement. Improved disease activity index scores, colon length, histopathological features, and myeloperoxidase activity were observed in the turanose supplemented group. Meanwhile, decreases in micro RNA (miR)-21 expression, histone acetylation, expression of pro-inflammatory cytokines, and phosphorylated ERK and STAT3 were observed in colon tissues. Notably, miR-21 and histone acetylation levels were found to positively correlated with expression of tumor necrosis factor α. In conclusion, turanose can attenuate colitis via regulatory effects on miRNA-21 expression and histone acetylation-related proinflammatory mediators. These findings also support further exploration of turanose as a potential therapeutic sugar substitute for patients with IBD.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education , Republic of Korea ( NRF-2018R1D1A1B07048087 ).
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Republic of Korea (NRF-2018R1D1A1B07048087). The authors declare no conflict of interests. The animal experiment protocols were approved by the Committee on the Ethics of Animal Experiments of Ewha Womans University (IACUC approval no: 17-026). The animal experiment was carried out strictly following the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health.
- Neisseria sicca