Circulating B Cell Expression Of CD77/Gb3 As A Means To Predict PTLD | 3107
Journal of Clinical & Experimental Pathology
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Postransplant lymphoproliferative disorder (PTLD) remains a major problem following
transplantation (mortality 40-60%)(likely to increase with the expanding populations of
hemopoietic stem cell transplant patients, who are at increased PTLD risk. There is no means to
predict PTLD but Epstein-Barr virus (EBV) infection is involved. The glycosphingolipid, globotriaosyl
ceramide (Gb3, also termed CD77, a germinal centre B cell marker) is the Burkitt lymphoma antigen
and is expressed on EBV infected B cells. CD77 is not expressed on normal circulating B cells. We
showed PTLD B cell lymphoma cells within tumour biopsies can be stained by the Gb3-binding Vero
(Shiga) toxin. EBV infected tissue transplants might allow CD77 positive germinal centre B cells to
escape into the circulation to provide progenitors of the infiltrating B cell PTLD lymphoma which
can develop, after transplant. Monitoring circulating CD77+ B cells subsequent to transplant, might
provide a reliable forewarning of PTLD.
By FACS with FITC-Verotoxin1 B subunit, to bind CD77, we monitored CD77 expression on
CD19 + circulating B cells in 14 pediatric patients for one year post transplant. Of these patients, only
one developed PTLD and we could predict this event via an extremely high level of CD77+ B cells in
the blood, 18 days prior to PTLD diagnosis. All other samples showed a basal level of circulating CD77+
B cells. This indicates routine monitoring of blood B cell CD77 expression could be a simple, general
predictor of PTLD, allowing benign treatment to prevent, rather than aggressive treatment attempting
to cure, established PTLD.
Dr Lingwood completed his PhD at the University of London in 1975. He has a long standing interest in the function
and biochemistry of glycosphingolipids and has more than175 peer reviewed publications in this field.
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