Gut permeability and low-grade inflammation in bipolar disorder
Introduction Systemic inflammation has been increasingly related to bipolar disorder -BD- (Tanaka et al. Neurosci Res 2017;115 59-63). Intestinal bacterial translocation has been postulated as one of the causes of this inflammation (Nguyen et al. J Psychiatr Res 2018;99 50-61). A possible pathway i...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Cambridge University Press
2023-03-01
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| Series: | European Psychiatry |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0924933823008350/type/journal_article |
| Summary: | Introduction
Systemic inflammation has been increasingly related to bipolar disorder -BD- (Tanaka et al. Neurosci Res 2017;115 59-63). Intestinal bacterial translocation has been postulated as one of the causes of this inflammation (Nguyen et al. J Psychiatr Res 2018;99 50-61). A possible pathway is through the lipopolysaccharide, which is presented to CD14 through lipopolysaccharide binding protein (LBP) leading to a release of systemic inflammatory markers like C-reactive protein (CPR) (Funda et al. Infect Immun 2001;69 3772-81).
Objectives
1) Describe gut permeability in patients with BD through the determination of intestinal inflammatory markers (LBP, sCD14) in plasma; 2) Analyze variables associated with intestinal inflammation.
Methods
Cross-sectional study of 38 patients with BD [mean age=45.50 (SD=10.93; range 23-68); males=15 (39.5%)], recruited from mental health outpatient clinics in Oviedo (Spain).
Assessment: Pro-inflammation biomarkers [CRP (mg/dL), Erythrocyte Sedimentation Rate (ESR) (mm/h), Neutrophil/Lymphocyte, Monocyte/Lymphocyte, Platelet/Lymphocyte and Systemic Immune Inflammation Indexes]. Indirect markers of intestinal bacterial translocation [LBP, soluble CD14 (sCD14)]. Dichotomous variables were created for LBP, considering LBP ≥15 μg/dL as increased gut permeability; and for CPR, considering CRP≥0.3 as systemic inflammation. Metabolic syndrome [ATPIII criteria: glucose, HDL, triglycerides (mg/dl), arterial pressure (mmHg), abdominal circumference (cm)], body mass index (BMI) (kg/m2), smoking, cannabis or alcohol use.
Statistical analyses: t-Student test, multiple linear regression analyses.
Results
Average LBP was 14.60 μg/dL (SD=6.4) and 15 patients (39.5%) had increased gut permeability. Moreover, average CPR was 0.40 mg/dL (SD=0.58) and 16 patients (47.1%) showed systemic inflammation. There were no patients with increased levels of sCD14.
Associations were found between LBP and CPR (r=0.357; p=0.032), cannabis use in the last month (t=-2.293; p=0.029), BMI (r=0.433; p=0.008) and abdominal obesity (t=3.006; p=0.005); but no with age or sex.
Subsequently, a multiple linear regression model for LBP was calculated with variables previously mentioned, and age (based on expert criteria). The overall regression was statistically significant (R2=0.49, F=9.273, p<0.001). It was found that CPR, abdominal obesity, and cannabis use in the last month significantly predicted LBP levels (table 1).
Table 1.
Multiple linear regression analyses to LBP
B
SE
β
t
p
CPR
4.842
1.529
0.439
3.167
0.004
Abdominal obesity
4.810
1.849
0.362
2.601
0.014
Cannabis use
-5.048
2.273
-0.296
-2.221
0.034
Conclusions
More than one third of patients with BD had increased gut permeability. Almost 50% had systemic inflammation. Intestinal permeability was directly related to abdominal obesity and systemic inflammation, but inversely related to cannabis use.
Disclosure of Interest
None Declared |
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| ISSN: | 0924-9338 1778-3585 |