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Blood, 1 August 2008, Vol. 112, No. 3, pp. 672-679.
Prepublished online as a Blood First Edition Paper on May 28, 2008; DOI 10.1182/blood-2007-10-116269.
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Submitted October 18, 2007
Accepted April 21, 2008
Epstein-Barr virus persistence in the absence of conventional memory B cells: IgM+IgD+ CD27+ B cells harbour the virus in X-linked lymphoproliferative disease patients
Sridhar Chaganti, Cindy S Ma, Andrew I Bell, Debbie Croom-Carter, Andrew D Hislop, Stuart G Tangye, and Alan B Rickinson*
Institute for Cancer Studies, University of Birmingham, Birmingham, United Kingdom
Immunology and Inflammation Program, Garvan Institute for Medical Research, Sydney, Australia
* Corresponding author; email: a.b.rickinson{at}bham.ac.uk.
Epstein-Barr virus (EBV) persists in healthy virus carriers within the immunoglobulin (Ig)D- CD27+ (class-switched) memory B cell compartment that normally arises through antigen stimulation and germinal centre transit. Patients with X-linked lymphoproliferative disease (XLP) lack such class-switched memory B cells but are highly susceptible to EBV infection, often developing fatal symptoms resembling those seen in EBV-associated haemophagocytosis (EBV-AHS), a disease caused by aberrant virus entry into the NK or T cell system. Here we show that XLP patients who survive primary EBV exposure carry relatively high virus loads in the B cell, but not the NK or T cell, compartment. Interestingly, in the absence of conventional class-switched memory B cells, the circulating EBV load was concentrated within a small population of IgM+ IgD+ CD27+ (non-switched) memory cells rather than within the numerically dominant naive (IgM+ IgD+ CD27-) or transitional (CD10+ CD27-) subsets. In two prospectively studied patients, the circulating EBV load was stable and markers of virus polymorphism detected the same resident strain over time. These results provide the first definitive evidence that EBV can establish persistence in the B cell system in the absence of fully-functional germinal centre activity and of a class-switched memory B cell compartment.

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