Abstract
Background
Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder involving changes in normal bowel movements. The pathophysiology of IBS is not clearly understood owing to the lack of identifiable pathological abnormalities and reliable biomarkers.
Aim
The aim of this study was to discover the novel and reliable biomarker for IBS.
Method
In this study, neonatal maternal separation (NMS) stress model was used for the IBS mouse model. Further assessment was conducted with whole gastrointestinal transit test, quantitative RT-PCR, histological examination, and western blot.
Results
Male pups developed symptoms similar to those of human IBS with diarrhea (IBS-D), such as low-grade inflammation, stool irregularity, and increased bowel motility. NMS stress influenced to the interstitial cells of Cajal (ICC) and induced altered bowel motility, resulting in IBS-D-like symptoms. In addition, we found neuronal nitric oxide synthase (nNOS) to be a novel biomarker for ICC under NMS stress. nNOS expression was only observed in the ICC of the submucosal plexus of IBS-D mice, and the inhibition of nNOS changed the phenotype from IBS-D to IBS with constipation.
Conclusion
Our study demonstrates that early-life stress can influence to ICC and modulate bowel activity and that nNOS might be used as a biomarker for ICC stimulation in IBS.
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Acknowledgments
This study was supported by the Korea Food and Drug Administration Grant (13182KFDA660 and 14182KFDA978) funded by the Korea government.
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Jang, D.E., Bae, J.H., Chang, Y.J. et al. Neuronal Nitric Oxide Synthase Is a Novel Biomarker for the Interstitial Cells of Cajal in Stress-Induced Diarrhea-Dominant Irritable Bowel Syndrome. Dig Dis Sci 63, 619–627 (2018). https://doi.org/10.1007/s10620-018-4933-7
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DOI: https://doi.org/10.1007/s10620-018-4933-7