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Circulating immune complexes in chronic hepatitis C
J F Tsai1, J E Jeng, W Y Chang
1Department of Internal Medicine, Kaohsiung Medical College, Taiwan, Republic of China.
Insights
Circulating immune complexes (CIC) are prevalent in chronic hepatitis C, particularly IgG class CIC. Elevated CIC levels correlate with disease severity and liver enzyme activity in hepatitis C virus patients.
Area of Science:
- Immunology
- Hepatology
- Virology
Background:
- Chronic hepatitis C is a significant global health concern.
- The role of circulating immune complexes (CIC) in hepatitis C virus (HCV) pathogenesis requires further elucidation.
- Understanding CIC profiles can aid in assessing disease activity and progression.
Purpose of the Study:
- To determine the frequency and characteristics of CIC in patients with chronic hepatitis C.
- To investigate the correlation between CIC levels and disease severity, including different forms of hepatitis.
- To compare CIC prevalence in chronic hepatitis C patients, HCV carriers, and healthy individuals.
Main Methods:
- Utilized an immunoglobulin-specific solid-phase enzyme immunoassay to detect IgM and IgG containing CIC.
- Employed C1q and conglutinin (K) assays to quantify CIC.
- Analyzed data from 54 chronic hepatitis C patients, 15 HCV carriers, and 54 healthy controls.
Main Results:
- A high prevalence of CIC (96.3%) was observed in chronic hepatitis C patients.
- Elevated IgG class CIC (IgG-K and IgG-C1q) were more frequent than IgM class CIC.
- Higher CIC levels, particularly IgG-K and IgM-K, were associated with chronic active hepatitis and elevated liver enzymes (AST, ALT).
Conclusions:
- Circulating immune complexes, especially IgG class CIC, are a common feature of chronic hepatitis C.
- CIC levels correlate with the severity of liver inflammation and disease activity in HCV infection.
- These findings highlight the potential diagnostic and prognostic value of CIC assessment in chronic hepatitis C management.
Abstract:
For assessing the role of circulating immune complexes (CIC) in chronic hepatitis C, the relative frequency of CIC was determined in 54 patients with chronic hepatitis C, 15 asymptomatic hepatitis C virus (HCV) carriers, and 54 healthy controls. IgM and IgG containing CIC were studied using both C1q and conglutinin (K) in an immunoglobulin-specific solid-phase enzyme immunoassay. CIC were a common feature of chronic hepatitis C with 96.3% of patients with at least one abnormal test result. The prevalence of elevated IgG-K, IgM-K, IgG-C1q, and IgM-C1q CIC was 70.3%, 50.0%, 64.8%, and 35.1%, respectively. The prevalence of IgG class CIC was higher than IgM class CIC (P = 0.038 for K-CIC and P = 0.01 for C1q-CIC, respectively). There is correlation between IgG-K CIC and IgG-C1q CIC (r = 0.445, P = 0.002), IgG-K CIC and IgM-C1q CIC (r = 0.348, P = 0.020), IgM-K CIC and aspartic aminotransferase (r = 0.321, P = 0.015), IgM-K CIC and alanine aminotransferase (r = 0.301, P = 0.027). Compared to patients with chronic persistent hepatitis and chronic lobular hepatitis, patients with chronic active hepatitis have a higher prevalence of elevated IgG-K CIC (77.2% vs. 40.0%, P = 0.029) and IgM-K CIC (56.8% vs. 20.0%, P = 0.038). The concentration of IgG-K, IgM-K, and IgM-C1q CIC in the former was significantly higher than that in the latter, respectively. In conclusion, IgG class CIC is the major type of CIC in chronic hepatitis C.(ABSTRACT TRUNCATED AT 250 WORDS)