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Expression of intrahepatic CD3, CD4, and CD8 T cells in biliary atresia
Behairy E Behairy1, Nermine Ehsan1, Magdy Anwer1
1National Liver Institute, Shebeen El-Kom, Egypt.
Insights
Biliary atresia (BA) shows significantly higher CD3, CD4, and CD8 T cell expression in liver tissue compared to other neonatal cholestasis causes. This T cell marker analysis aids in diagnosing BA.
Area of Science:
- Hepatology
- Immunology
- Pediatric Gastroenterology
Background:
- Biliary atresia (BA) is a severe neonatal liver disease characterized by bile duct obstruction.
- The pathogenesis of BA is thought to involve immune-mediated processes, but the specific immune cell involvement requires further elucidation.
Purpose of the Study:
- To assess and compare the expression of CD3, CD4, and CD8 T cells in liver tissues of infants with BA versus those with other causes of neonatal cholestasis.
- To identify potential diagnostic markers for BA based on T cell infiltration.
Main Methods:
- Liver tissue samples were analyzed from 34 BA patients, 35 patients with other neonatal cholestasis, and 10 controls.
- Immunohistochemical staining was performed to quantify CD3, CD4, and CD8 T cells within the portal tracts.
Main Results:
- BA patients exhibited significantly higher infiltration of CD3+, CD4+, and CD8+ T cells in portal tracts compared to cholestasis and control groups.
- Distinct clinical and histological features, including clay-colored stools and portal ductular proliferation, differentiated BA.
- Cutoff values for T cell counts were established to distinguish BA from other cholestatic conditions.
Conclusions:
- The findings support an immune-mediated mechanism in BA pathogenesis, with significant T cell involvement.
- Immunohistochemical analysis of CD3, CD4, and CD8 T cells in liver tissue can serve as a valuable diagnostic tool for BA.
- Elevated T cell populations in the portal tract are indicative of BA.
Aim Of The Study:
Assessment of the expression of cluster of differentiation (CD)3, CD4, and CD8 T cells in biliary atresia (BA) cases in comparison to neonatal cholestasis other than BA.
Material And Methods:
This study included 79 patients: 34 patients with BA (BA group) and 35 patients with neonatal cholestasis due to causes other than BA (cholestasis group), and 10 normal liver donor as a control group. Immunohistochemical staining or CD3, CD4, and CD8 T cells in liver tissues for the 3 groups were evaluated.
Results:
Presence of clay stool, high gamma-glutamyl transferase levels, thrombocytosis, and non-contractibility of the gallbladder was the main clinical, laboratory, and radiological findings, distinguishing BA from other disorders causing neonatal cholestasis. Portal ductular proliferation, bile plugs in portal ductules, and advanced grades of fibrosis were more predominant in liver biopsy specimens of BA patients. The CD3+, CD4+, and CD8+ expression in patients with BA were significantly higher than in both cholestasis and control groups, while it was comparable in the cholestasis and control groups, with cutoff values of 25, 12, and 2.5 cells/portal tract, respectively, differentiating between BA and cholestatic patients.
Conclusions:
Immune-mediated destruction of bile ducts is incriminated in the pathogenesis of BA. Lymphocytic infiltrate in portal tract is primarily composed of CD3, CD4, and CD8 T cells. Immunostaining of liver tissue for CD3, CD4, and CD8 T cells can help in ensuring diagnosis of BA.
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