Altered profiles of intestinal microbiota and organic acids may be the origin of symptoms in irritable bowel syndrome

Study information

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study design

case-control

Citation

PMID PubMed identifier for scientific articles.

19903265

DOI Digital object identifier for electronic documents.

10.1111/j.1365-2982.2009.01427.x

URI

Authors

Tana C, Umesaki Y, Imaoka A, Handa T, Kanazawa M, Fukudo S

Journal

Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society

Year

2010

BACKGROUND: The profile of intestinal organic acids in irritable bowel syndrome (IBS) and its correlation with gastrointestinal (GI) symptoms are not clear. We hypothesized in this study that altered GI microbiota contribute to IBS symptoms through increased levels of organic acids. METHODS: Subjects were 26 IBS patients and 26 age- and sex-matched controls. Fecal samples were collected for microbiota analysis using quantitative real-time polymerase chain reaction and culture methods, and the determination of organic acid levels using high-performance liquid chromatography. Abdominal gas was quantified by image analyses of abdominal X-ray films. Subjects completed a questionnaire for GI symptoms, quality of life (QOL) and negative emotion. KEY RESULTS: Irritable bowel syndrome patients showed significantly higher counts of Veillonella (P = 0.046) and Lactobacillus (P = 0.031) than controls. They also expressed significantly higher levels of acetic acid (P = 0.049), propionic acid (P = 0.025) and total organic acids (P = 0.014) than controls. The quantity of bowel gas was not significantly different between controls and IBS patients. Finally, IBS patients with high acetic acid or propionic acid levels presented with significantly worse GI symptoms, QOL and negative emotions than those with low acetic acid or propionic acid levels or controls. CONCLUSIONS & INFERENCES: These results support the hypothesis that both fecal microbiota and organic acids are altered in IBS patients. A combination of Veillonella and Lactobacillus is known to produce acetic and propionic acid. High levels of acetic and propionic acid may associate with abdominal symptoms, impaired QOL and negative emotions in IBS.

Experiment 1

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Reviewed Marked as Reviewed by Atrayees on 2023-7-19

Curated date: 2021/07/04

Curator: Kwekuamoo

Revision editor(s): WikiWorks, LGeistlinger, Kwekuamoo, Atrayees

Subjects

Location of subjects: Japan

Host species Species from which microbiome was sampled. Contact us to have more species added.: Homo sapiens

Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology: Feces Cow dung,Cow pat,Droppings,Dung,Excrement,Excreta,Faeces,Fecal material,Fecal matter,Fewmet,Frass,Guano,Matières fécales@fr,Merde@fr,Ordure,Partie de la merde@fr,Piece of shit,Porción de mierda@es,Portion of dung,Portion of excrement,Portion of faeces,Portion of fecal material,Portion of fecal matter,Portion of feces,Portion of guano,Portion of scat,Portionem cacas,Scat,Spoor,Spraint,Stool,Teil der fäkalien@de,Feces,feces

Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology

Group 0 name Corresponds to the control (unexposed) group for case-control studies: Healthy Control

Group 1 name Corresponds to the case (exposed) group for case-control studies: IBS

Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group: All patients were diagnosed with IBS after conducting a medical interview based on Rome II criteria and positive judgment by a Rome II modular questionnaire retrospectively and positively fulfilling Rome III criteria. According to Rome II criteria related to bowel habits, 11 subjects had constipation-predominant IBS (IBS-C), eight had diarrhoea-predominant IBS (IBS-D) and seven had mixed IBS (IBS-M).

Group 0 sample size Number of subjects in the control (unexposed) group: 26

Group 1 sample size Number of subjects in the case (exposed) group: 26

Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any): In the previous study, agents containing probiotics were administered to humans and stopped thereafter. On day 10 after stopping the administration of probiotics, levels of these bacteria returned to the levels before administration of probiotics. No subject received antibiotics during the abstention period.

Lab analysis

Sequencing type: WMS

16S variable region One or more hypervariable region(s) of the bacterial 16S gene: Not specified

Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance: RT-qPCR

Statistical Analysis

Statistical test: Spearman Correlation

Significance threshold p-value or FDR threshold used for differential abundance testing (if any): 0.05

MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?: No

Matched on Factors on which subjects have been matched on in a case-control study: age, sex

Signature 1

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Source: Table 2

Description: Comparison of GI microbiota between IBS patients and the controls

Abundance in Group 1: increased abundance in IBS

NCBI	Quality Control	Links
Veillonella
Lactobacillus

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Source: text

Description: Comparison of GI microbiota between IBS patients and the controls

Abundance in

Abundance in Group 1: decreased abundance in IBS

NCBI	Quality Control	Links
Clostridium

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