Expression of Granzyme B during Primary Cytomegalovirus Infection after Renal Transplantation
Renal Transplant Unit, Clinical and Laboratory Immunology Unit, Departments of Clinical Immunology and Rheumatology and of Clinical Virology, Academic Medical Center, University of Amsterdam; Central Laboratory of the Netherlands Red Cross Blood Transfusion Service and Laboratory for Clinical and Experimental Immunology, Department of Pathophysiology of Plasma Proteins, Amsterdam, The Netherlands
CD8+ T cells employ granzyme B (GrB) to induce apoptosis in target cells. Increased expression of GrB has been put forward as a diagnostic marker in transplant rejection and viral infection. Three‐color flow cytometric analysis revealed that peripheral blood CD8+ T lymphocytosis during primary cytomegalovirus infection after renal transplantation resulted from expansion of a CD8+GrB+CD62L+ T cell subset that was almost absent during stable transplant function or acute rejection. This expansion coincided with a temporary increase in systemic soluble GrB (sGrB) levels. No such increase was observed during stable transplant function or acute rejection. Thus, the primary immune response to cytomegalovirus infection is accompanied by appearance of CD8+GrB+CD62L+ T cells and increased sGrB levels in the peripheral blood compartment. Determination of the latter may provide a novel approach for monitoring viral infections.
Received 11 June 1998; revised 14 October 1998.
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Presented in part: 4th International Symposium on Clinical Immunology, Amsterdam, June 1997; 13th European Immunology Meeting, Amsterdam, June 1997; 34th Congress of the EDTA‐ERA, Geneva, September 1997; 5th Basic Sciences Symposium, Chautauqua, New York, September 1997.
Informed consent was obtained from all patients or their parents. The study was approved by the medical ethics review board, Academic Medical Center.
Financial support: Dutch Kidney Foundation (grant C93.1278).
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Present affiliation: Department of Medical Microbiology, Academic Medical Center, University of Amsterdam.





