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

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Reviewed Marked as Reviewed by Atrayees on 2023-7-19
study design
Citation
PMID PubMed identifier for scientific articles.
DOI Digital object identifier for electronic documents.
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


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

Curated date: 2021/07/04

Curator: Kwekuamoo

Revision editor(s): LGeistlinger, Kwekuamoo, WikiWorks, 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
Irritable bowel syndrome [X]Psychogenic IBS,Adaptive colitis,Colitides, Mucous,Colitis, Mucous,Colon spasm,Colon, Irritable,Functional bowel disease,IBD,IBS,IBS - Irritable bowel syndrome,IC - Irritable colon,Irritable bowel,Irritable bowel - IBS,irritable bowel syndrome,Irritable Bowel Syndromes,Irritable Colon,irritable colon,Irritable colon (disorder),Irritable colon - Irritable bowel syndrome,Irritable colon syndrome,Membranous colitis,Mucous Colitides,Mucous colitis,mucus colitis,Nervous colitis,Psychogenic IBS,psychogenic IBS,Spastic colitis,Spastic colon,spastic colon,Syndrome, Irritable Bowel,Syndromes, Irritable Bowel,Irritable bowel syndrome
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

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

Curated date: 2021/07/04

Curator: Kwekuamoo

Revision editor(s): Kwekuamoo, Atrayees

Source: Table 2

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

Abundance in Group 1: increased abundance in IBS

NCBI Quality ControlLinks
Veillonella
Lactobacillus

Revision editor(s): Kwekuamoo, Atrayees

Signature 2

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

Curated date: 2023/07/19

Curator: Atrayees

Revision editor(s): Atrayees

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 ControlLinks
Clostridium

Revision editor(s): Atrayees