[The relationship between Chlamydia pneumoniae infection and primary biliary cirrhosis]
Hai-Ying Liu1, Lie-Ying Fan, Xiao-Qing Tu
1Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University and Clinical Immunology Center of PLA, Shanghai 200003, China.
Insights
This study investigated the link between Chlamydia pneumoniae infection and primary biliary cirrhosis (PBC). While not a direct cause, Chlamydia pneumoniae infection may contribute to elevated IgM levels in PBC patients.
Area of Science:
- Hepatology
- Infectious Disease Immunology
Context:
- Primary biliary cirrhosis (PBC) is a chronic liver disease with an autoimmune component.
- The role of infectious agents, such as Chlamydia pneumoniae (CP), in the pathogenesis of PBC is under investigation.
Purpose:
- To evaluate the association between Chlamydia pneumoniae infection and primary biliary cirrhosis.
- To determine if CP infection is a triggering agent for PBC or contributes to its manifestations.
Summary:
- Chlamydia pneumoniae IgG and IgM levels were assessed in PBC patients and controls using ELISA.
- Elevated CP IgG seroprevalence was observed in PBC and primary ஹெπατίτις C (PHC) groups compared to healthy controls (HC).
- A higher seroprevalence of CP IgM was found in PBC patients, correlating with increased IgM levels.
Impact:
- Results do not support Chlamydia pneumoniae as a direct trigger for PBC.
- Findings suggest Chlamydia pneumoniae infection may play a role in the elevated IgM levels characteristic of PBC.
Objective:
The aim of this study was to evaluate the association between Chlamydia pneumoniae (CP) infection and primary biliary cirrhosis (PBC).
Methods:
Chlamydia pneumoniae IgG and IgM were determined by enzyme-linked immunosorbent assay (ELISA) in 41 well-established PBC patients and two race-matched control groups, PHC, n = 70; healthy controls, HC, n =57).
Results:
The mean levels and seroprevalence of CP IgG in PBC group and PHC group were significantly higher than in the HC [(46.8 +/- 43.4) RU/ml, (49.5 +/- 45.2) RU/ml vs (28.3 +/- 32.7) RU/ml, P = 0.042 and P < 0.001 respectively; 68.3%, 71.4% vs 42.1%, chi2 values were 5.389 and 11.110 respectively]. There was a markedly elevated seroprevalence of CP IgM in patients with PBC (22.0%) compared with the PHC and HC groups. The odds ratios (ORs) for the presence of CP IgG and IgM for the PBC patients versus the HC were 2.7 (95% CI 0.9 to 6.1) and 5.1 (95% CI 1.4 to 18.5). Though there was no correlation in the level of CP IgG with total IgG in sera of patients with PBC (r=-0.857, p=0.344), CP IgM was related with the abnormally high concentrations of total IgM in the PBC group.
Conclusions:
The results of this study do not support the hypothesis that infection with Chlamydia pneumoniae may be a triggering agent for PBC, but suggest that Chlamydia pneumoniae infection probably contributes to the high level of IgM presented in most of the patients with PBC
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