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2005 ; 115
(12
): 3602-12
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English Wikipedia
Cross-reactive influenza virus-specific CD8+ T cells contribute to
lymphoproliferation in Epstein-Barr virus-associated infectious mononucleosis
#MMPMID16308574
Clute SC
; Watkin LB
; Cornberg M
; Naumov YN
; Sullivan JL
; Luzuriaga K
; Welsh RM
; Selin LK
J Clin Invest
2005[Dec]; 115
(12
): 3602-12
PMID16308574
show ga
The marked proliferation of activated CD8+ T cells is pathognomonic of
EBV-associated infectious mononucleosis (IM), common in young adults. Since the
diversity and size of the memory CD8+ T cell population increase with age, we
questioned whether IM was mediated by the reactivation of memory CD8+ T cells
specific to previously encountered pathogens but cross-reactive with EBV. Of 8
HLA-A2+ IM patients, 5 had activated T cells specific to another common virus, as
evidenced by a significantly higher number of peripheral blood influenza A virus
M1(58-66)-specific T cells compared with healthy immune donors. Two patients with
an augmented M1 response had tetramer-defined cross-reactive cells recognizing
influenza M1 and EBV-BMLF1(280-288), which accounted for up to one-third of their
BMLF1-specific population and likely contributed to a skewed M1-specific T cell
receptor repertoire. These epitopes, with only 33% sequence similarity, mediated
differential effects on the function of the cross-reactive T cells, which may
contribute to alterations in disease outcome. EBV could potentially encode an
extensive pool of T cell epitopes that activate other cross-reactive memory T
cells. Our results support the concept that cross-reactive memory CD8+ T cells
activated by EBV contribute to the characteristic lymphoproliferation of IM.