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Published on: May 7, 2015
C4d in acute rejection after liver transplantation--a valuable tool in differential diagnosis to hepatitis C
M Schmeding1, A Dankof, V Krenn
1Department of General, Visceral and Transplantation Surgery, Charité Campus Virchow Klinikum, Berlin, Germany. maximilian.schmeding@charite.de
Insights
C4d deposition in liver biopsies can help differentiate acute cellular rejection from Hepatitis C virus (HCV) reinfection after liver transplantation. This distinction is vital as rejection treatments can worsen HCV recurrence.
Area of Science:
- Transplantation immunology
- Hepatology
- Complement system in rejection
Background:
- Hepatitis C virus (HCV) recurrence is common after liver transplantation, leading to graft failure.
- Distinguishing acute cellular rejection from HCV reinfection is critical for appropriate treatment.
- Current diagnostic methods struggle to differentiate between rejection and HCV recurrence.
Purpose of the Study:
- To investigate C4d deposition as a specific marker for differentiating acute cellular rejection from HCV reinfection.
- To assess the role of humoral components, specifically C4d, in acute cellular rejection post-liver transplantation.
- To evaluate the utility of C4d immunohistochemistry in liver biopsies for clinical decision-making.
Main Methods:
- Immunohistochemical analysis of liver biopsies from 97 patients.
- Assessment of C4d staining in patients with acute cellular rejection, HCV reinfection, and controls.
- Statistical analysis to determine the specificity and sensitivity of C4d as a diagnostic marker.
Main Results:
- C4d positivity was observed in 67.7% of patients with acute cellular rejection.
- Only 11.8% of patients with HCV reinfection showed C4d positivity.
- A low rate of C4d positivity (6.9%) was found in the control group.
Conclusions:
- C4d deposition is a significant indicator of humoral involvement in acute cellular rejection after liver transplantation.
- C4d immunohistochemistry shows promise as a tool to distinguish acute cellular rejection from HCV reinfection.
- This finding could lead to more targeted and effective treatment strategies for liver transplant recipients.
Abstract:
Hepatitis C is the most common indication for liver transplantation. Recurrence of HCV is universal leading to graft failure in up to 40% of all patients. The differentiation between acute rejection and recurrent hepatitis C is crucial as rejection treatments are likely to aggravate HCV recurrence. Histological examination of liver biopsy remains the gold standard for diagnosis of acute rejection but has failed in the past to distinguish between acute rejection and recurrent hepatitis C. We have recently reported that C4d as a marker of the activated complement cascade is detectable in hepatic specimen in acute rejection after liver transplantation. In this study, we investigate whether C4d may serve as a specific marker for differential diagnosis in hepatitis C reinfection cases. Immunohistochemical analysis of 97 patients was performed. A total of 67.7% of patients with acute cellular rejection displayed C4d-positive staining in liver biopsy whereas 11.8% of patients with hepatitis C reinfection tested positive for C4d. In the control group, 6.9% showed C4d positivity. For the first time we were able to clearly demonstrate that humoral components, represented by C4d deposition, play a role in acute cellular rejection after LTX. Consequently C4d may be helpful to distinguish between acute rejection and reinfection after LTX for HCV.
