Imbalance of Microbacterial Diversity Is Associated with Functional Prognosis of Stroke

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Reviewed Marked as Reviewed by Svetlana up on 2024-12-16
Citation
PMID PubMed identifier for scientific articles.
DOI Digital object identifier for electronic documents.
URI
Authors
Zhang X, Wang X, Zhao H, Cao R, Dang Y, Yu B
Journal
Neural plasticity
Year
2023
OBJECTIVES: There is mounting evidence to suggest that the pathophysiology of stroke is greatly influenced by the microbiota of the gut and its metabolites, in particular short-chain fatty acids (SCFAs). The primary purpose of the study was to evaluate whether the levels of SCFAs and the gut microbiota are altered in poststroke patients and to examine the relationship between these alterations and the physical condition, intestinal health, pain, or nutritional status of patients. METHODS: Twenty stroke patients and twenty healthy controls were enrolled in the current study, and their demographics were matched. Gas chromatography was used to determine the fecal SCFAs, and 16S rRNA gene sequencing was used to evaluate their fecal microbiota. Microbial diversity and richness were examined using the diversity indices alpha and beta, and taxonomic analysis was utilized to determine group differences. The relationships between the gut microbiome and fecal SCFAs, discriminant bacteria, and poststroke clinical outcomes were analyzed. RESULTS: Less community richness (ACE and Chao) was observed in the poststroke patients (P < 0.05), but the differences between the poststroke group and the healthy control group in terms of species diversity (Shannon and Simpson) were not statistically significant. The makeup of the poststroke gut microbiota was distinct from that of the control group, as evidenced by beta diversity. Then, the relative abundances of the taxa in the poststroke and control groups were compared in order to identify the specific microbiota changes. At the level of phylum, the poststroke subjects showed a significant increase in the relative abundances of Akkermansiaceae, Fusobacteriota, Desulfobacterota, Ruminococcaceae, and Oscillospirales and a particularly noticeable decrease in the relative abundance of Acidobacteriota compared to the control subjects (P < 0.05). In regard to SCFA concentrations, lower levels of fecal acetic acid (P = 0.001) and propionic acid (P = 0.049) were found in poststroke subjects. Agathobacter was highly correlated with acetic acid level (r = 0.473, P = 0.002), whereas Fusobacteria (r = -0.371, P = 0.018), Flavonifractor (r = -0.334, P = 0.034), Desulfovibrio (r = -0.362, P = 0.018), and Akkermansia (r = -0.321, P = 0.043) were negatively related to acetic acid levels. Additionally, the findings of the correlation analysis revealed that Akkermansia (r = -0.356, P = 0.024), Desulfovibrio (r = -0.316, P = 0.047), and Alloprevotella (r = -0.366, P = 0.020) were significantly negatively correlated with high-density lipoprotein cholesterol. In addition, the Neurogenic Bowel Dysfunction score (r = 0.495, P = 0.026), Barthel index (r = -0.531, P = 0.015), Fugl-Meyer Assessment score (r = -0.565, P = 0.009), Visual Analogue Scale score (r = 0.605, P = 0.005), and Brief Pain Inventory score (r = 0.507, P = 0.023) were significantly associated with alterations of distinctive gut microbiota. CONCLUSIONS: Stroke generates extensive and substantial alterations in the gut microbiota and SCFAs, according to our findings. The differences of intestinal flora and lower fecal SCFA levels are closely related to the physical function, intestinal function, pain, or nutritional status of poststroke patients. Treatment strategies aimed at modulating the gut microbiota and SCFAs may have the potential to enhance the clinical results of patients.

Experiment 1


Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/09

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam

Subjects

Location of subjects
China
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
Stroke Acute Cerebrovascular Accident,Acute Cerebrovascular Accidents,Acute Stroke,Acute Strokes,Apoplexy,Apoplexy, Cerebrovascular,Brain Vascular Accident,Brain Vascular Accidents,cerebral infarction,Cerebral Stroke,Cerebral Strokes,Cerebrovascular Accident,cerebrovascular accident,Cerebrovascular accident (disorder),Cerebrovascular accident (disorder) [Ambiguous],CEREBROVASCULAR ACCIDENT, (CVA),cerebrovascular accident, (CVA),Cerebrovascular Accident, Acute,Cerebrovascular Accidents,Cerebrovascular Accidents, Acute,Cerebrovascular Apoplexy,Cerebrovascular Apoplexya,Cerebrovascular Stroke,Cerebrovascular Strokes,CVA,CVA (cerebral vascular accident),CVA (Cerebrovascular Accident),CVA - Cerebrovascular accident,CVA - Cerebrovascular accident unspecified,CVA, CEREBROVASCULAR ACCIDENT,CVA, cerebrovascular accident,CVAs (Cerebrovascular Accident),ischemic stroke,stroke,Stroke and cerebrovascular accident unspecified,Stroke and cerebrovascular accident unspecified (disorder),stroke disorder,Stroke NOS,Stroke NOS (disorder),STROKE SYNDROME,stroke syndrome,Stroke, Acute,Stroke, Cerebral,Stroke, Cerebrovascular,Stroke/CVA - undefined,Strokes,Strokes, Acute,Strokes, Cerebral,Strokes, Cerebrovascular,SYNDROME, STROKE,syndrome, stroke,undetermined stroke,Vascular Accident, Brain,Vascular Accidents, Brain,Stroke
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
Post Stroke Patients
Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group
Post Stroke patients
Group 0 sample size Number of subjects in the control (unexposed) group
20
Group 1 sample size Number of subjects in the case (exposed) group
20

Lab analysis

Sequencing type
16S
16S variable region One or more hypervariable region(s) of the bacterial 16S gene
V3-V4
Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance
Illumina

Statistical Analysis

Data transformation Data transformation applied to microbial abundance measurements prior to differential abundance testing (if any).
relative abundances
Statistical test
LEfSe
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
LDA Score above Threshold for the linear discriminant analysis (LDA) score for studies using the popular LEfSe tool
2.0
Matched on Factors on which subjects have been matched on in a case-control study
age, sex, Matched on: "risk factor" is not in the list (abnormal glucose tolerance, acetaldehyde, acute graft vs. host disease, acute lymphoblastic leukemia, acute myeloid leukemia, adenoma, age, AIDS, alcohol consumption measurement, alcohol drinking, ...) of allowed values.risk factor

Alpha Diversity

Shannon Estimator of species richness and species evenness: more weight on species richness
unchanged
Chao1 Abundance-based estimator of species richness
decreased
Simpson Estimator of species richness and species evenness: more weight on species evenness
unchanged
Richness Number of species
decreased

Signature 1

Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/10

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam

Source: Figure 2(b)

Description: Compositional changes in the gut microbiota of poststroke and healthy controls.

Abundance in Group 1: increased abundance in Post Stroke Patients

NCBI Quality ControlLinks
Desulfovibrionaceae
Desulfovibrionales
Desulfovibrionia
Eubacteriales
Fusobacteriaceae
Fusobacteriales
Fusobacteriia
Oscillospiraceae
uncultured Gram-positive bacterium

Revision editor(s): Ifeanyisam

Signature 4

Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/13

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam, Rahila

Source: Figure 2(b)

Description: Compositional changes in the gut microbiota of poststroke and healthy controls

Abundance in Group 1: decreased abundance in Post Stroke Patients

NCBI Quality ControlLinks
Acetobacteraceae
Acetobacterales
Bdellovibrionales
Bdellovibrionia
Bryobacteraceae
Bryobacterales
Chitinophagales
Frankiales
Fusobacteriia
Gemmatimonadaceae
Gemmatimonadales
Geodermatophilaceae
Hyphomicrobiales
Ktedonobacteraceae
Ktedonobacterales
Ktedonobacteria
Microbacteriaceae
Muribaculaceae
Paenibacillaceae
Polyangia
Pseudobdellovibrionaceae
Pseudonocardiaceae
Pseudonocardiales
Rickettsiales
Terriglobales
Thermoleophilia
Xanthobacteraceae
unclassified Cyanobacteriota
JG30 KF AS9JG30 KF AS9
Acidobacteriaceae SubgAcidobacteriaceae Subg
Cyanobacteriota

Revision editor(s): Ifeanyisam, Rahila

Experiment 2


Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/16

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam

Differences from previous experiment shown

Subjects

Lab analysis

Statistical Analysis

Statistical test
Mann-Whitney (Wilcoxon)
MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?
Yes
LDA Score above Threshold for the linear discriminant analysis (LDA) score for studies using the popular LEfSe tool
Not specified

Alpha Diversity

Shannon Estimator of species richness and species evenness: more weight on species richness
unchanged
Chao1 Abundance-based estimator of species richness
decreased
Simpson Estimator of species richness and species evenness: more weight on species evenness
unchanged
Richness Number of species
decreased

Signature 1

Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/16

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam

Source: Figure 2(a)

Description: The mean relative abundances of taxa at the phylum level in poststroke and control subjects

Abundance in Group 1: increased abundance in Post Stroke Patients

NCBI Quality ControlLinks
Fusobacteriota
Thermodesulfobacteriota

Revision editor(s): Ifeanyisam

Signature 2

Reviewed Marked as Reviewed by Svetlana up on 2024-12-16

Curated date: 2024/10/16

Curator: Ifeanyisam

Revision editor(s): Ifeanyisam

Source: Figure 2(a)

Description: The mean relative abundances of taxa at the phylum level in poststroke and control subjects

Abundance in Group 1: decreased abundance in Post Stroke Patients

NCBI Quality ControlLinks
Acidobacteriota
Chloroflexota
bacterium

Revision editor(s): Ifeanyisam