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Flow cytometry: its use in pediatric renal transplantation utilizing polyclonal induction
1Division of Pediatric Nephrology, C.S. Mott Children's Hospital, University of Michigan, Ann Arbor, USA.
Cytometry
|March 15, 1995
Summary
Flow cytometry monitoring of T-cell suppression after pediatric kidney transplant with polyclonal agents shows initial suppression but subsequent rebound, with unclear utility despite high graft survival rates.
Area of Science:
- Immunology
- Transplantation
- Pediatric Nephrology
Background:
- Pediatric renal transplant immunosuppression commonly uses polyclonal or monoclonal agents.
- Polyclonal agents (e.g., Minnesota antilymphoblast globulin, anti-thymocyte globulin) target both T and B cells.
- Monoclonal agents (e.g., OKT3) are T-cell specific, with flow cytometry monitoring T-cell subset suppression.
Purpose of the Study:
- To evaluate the role of flow cytometric analysis in assessing immunosuppression adequacy during polyclonal induction therapy in pediatric renal transplant recipients.
- To determine if flow cytometry can predict allograft outcomes in this population.
Main Methods:
- Flow cytometric analysis of T-cell subsets (CD3, CD4, CD8) was performed in pediatric renal transplant recipients receiving polyclonal induction agents (ATGAM or MALG).
- T-cell subset patterns were analyzed for suppression and rebound during induction therapy.
- Allograft survival rates were correlated with flow cytometry findings.
Main Results:
- Polyclonal induction initially suppressed CD3, CD4, and CD8 T-cell subsets.
- A rebound in CD3 cells was observed despite daily polyclonal agent use, unlike with monoclonal OKT3 therapy.
- Flow cytometry did not predict a kidney loss event.
- No significant difference in flow cytometry patterns was noted between ATGAM and MALG induction.
- Flow cytometry failed to demonstrate persistent T-cell suppression.
Conclusions:
- Flow cytometry reveals variable T-cell suppression patterns during polyclonal induction in pediatric kidney transplant recipients but does not consistently demonstrate persistent suppression.
- The utility of flow cytometry for monitoring immunosuppression adequacy during polyclonal induction in pediatric renal transplantation remains undefined.
- Despite limitations in flow cytometry monitoring, the University of Michigan program achieved a 97% 1-year allograft survival rate.