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CD40L (CD154) expression in human liver allografts during chronic ductopenic rejection
A S Gaweco1, R H Wiesner, S Yong
1Liver Transplant Program, Loyola University Medical Center, Maywood, IL 60153, USA. agaweco@luc.edu
Liver Transplantation and Surgery : Official Publication of the American Association for the Study of Liver Diseases and the International Liver Transplantation Society
|January 5, 1999
Summary
CD40L expression on Kupffer cells and macrophages is linked to chronic liver allograft rejection. Targeting this CD40-CD40L interaction may offer new therapeutic strategies for transplant patients.
Area of Science:
- Immunology
- Transplantation Biology
- Pathogenesis Research
Background:
- The CD40-CD40L (CD154) pathway is crucial in allograft rejection mechanisms.
- Blocking this costimulatory pathway has shown promise in preventing chronic rejection in animal models.
Purpose of the Study:
- To investigate the in situ expression of CD40 and CD40L in human liver allografts during ductopenic chronic rejection (CR).
- To identify the specific cell types expressing CD40L in rejected liver allografts.
Main Methods:
- Immunohistochemistry was used to assess CD40 and CD40L expression in human liver allograft specimens (n=8) with CR and controls (n=11).
- Serial sections were analyzed using anti-CD68 monoclonal antibody to identify CD40L+ cells.
Main Results:
- Significant CD40L expression was detected on Kupffer cells (KCs) and sinusoidal macrophages in CR allografts, with a distinct centrilobular distribution (P <.001).
- These CD40L+ cells were confirmed as CD68+.
- CD40L expression was absent in stable allografts and normal liver tissues, while CD40 expression was minimal in both CR and control groups.
Conclusions:
- Kupffer cells and macrophages are significant cellular sources of CD40L expression in chronic ductopenic liver allograft rejection.
- CD40-CD40L costimulatory interactions involving KCs and macrophages may play a key role in the pathogenesis of chronic liver allograft rejection.
