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Metabolomic Alterations of Volatile Organic Compounds and Bile Acids as Biomarkers of Microbial Shifts in a Murine Model of Short Bowel Syndrome
oleh: Vanessa Wolfschluckner, Beate Obermüller, Angela Horvath, Giovanny Rodriguez-Blanco, Patricia Fuchs, Wolfram Miekisch, Barbara Mittl, Christina Flucher, Holger Till, Georg Singer
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-11-01 |
Deskripsi
Pediatric short bowel syndrome (SBS) is a rare condition characterized by a massive loss of the small intestine, leading to the inability to meet nutritional requirements without the use of parenteral or enteral supplementation. SBS causes profound alterations in the intestinal microbiome and metabolome. The aim of this study was a detailed assessment of the intestinal microbiome and metabolome in a murine model of SBS. We performed a 60% proximal small bowel resection versus a sham operation in C57BL/6 mice. Four weeks postoperatively, the microbial communities of different intestinal segments (jejunum, ileum, colon) and stool were assessed by 16S rRNA gene sequencing. Bile acids in serum and stool and volatile organic compounds (VOCs) in the fecal headspace were assessed using LC-MS and GC-MS techniques. The α-diversity of the different intestinal segments did not significantly differ between the two groups. β-diversity significantly differed between sham and SBS mice. While in the jejunum, <i>Faecalibaculum</i> was significantly increased in SBS animals, a significant reduction in <i>Lactobacillus</i> and <i>Sporosarcina</i> was detected in the ileum of SBS mice. In the colon of SBS mice, a significant decrease in <i>Ruminococcaceae</i> and a significant increase in Proteobacteria such as <i>Faecalibaculum</i> and <i>Escherichia-Shigella</i> were found. Serum levels of deoxycholic, taurocholic and taurochenodeoxycholic acids were significantly higher in the SBS group. Of the 29 VOCs tested, hexane, isoflurane and pentane were significantly higher in the SBS group, and pyrrole was significantly lower. We were able to show that SBS causes shifts in the murine intestinal microbiome and metabolome including serum BAs and fecal VOCs.