Abstract
Slow transit constipation (STC) is a gastrointestinal disorder characterized by abnormal prolonged colonic transit time, which affects the life quality of many people. The decrease number of interstitial cells of Cajal (ICCs) is involved in the pathogenesis of STC. However, the molecular mechanism of loss of ICCs in STC remains unclear, making it difficult to develop new agents for the disease. In this study, we investigated the mechanism of decreasing ICCs in the pathogenesis of STC. We constructed the STC model rats by using atropine and diphenoxylate. A series of methods were used including immunofluorescence and immunochemistry staining, western blot, qRT-PCR, exosomes extraction and exosomes labeling. The results indicate that ICCs decreased in the STC rats accompanied with the macrophages activation. Further studies suggested that macrophages decreased the cell viability of ICCs by secretion exosomes containing miR-34c-5p. miR-34c-5p targeted the 3′-UTR of stem cell factor(SCF) mRNA and regulated the expression of SCF negatively. In conclusion, we demonstrated a novel regulatory mechanism of ICCs cell viability in STC. We found that exosome miR-34c-5p mediate macrophage-ICCs cross-talk. M1 macrophages derived exosomes miR-34c-5p decreased ICCs cell viability by directly targeting SCF.
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Acknowledgements
This study was supported by research grants from the Six Talent Peaks Project in Jiangsu Province (WSN-239). We would like to thank all the researchers and study participants for their contributions.
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Comunicated by Kundan Sengupta.
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Xu, S., Zhai, J., Xu, K. et al. M1 macrophages-derived exosomes miR-34c-5p regulates interstitial cells of Cajal through targeting SCF. J Biosci 46, 90 (2021). https://doi.org/10.1007/s12038-021-00212-z
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DOI: https://doi.org/10.1007/s12038-021-00212-z