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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/05/1641/10 $2.00
Volume 185, Number 9, May 5, 1997 1641-1650

Pathogenesis of an Infectious Mononucleosis-like Disease Induced by a Murine gamma -Herpesvirus: Role for a Viral Superantigen?

By Ralph A. Tripp,* Ann Marie Hamilton-Easton,* Rhonda D. Cardin,* Phuong Nguyen,* Frederick G. Behm,Dagger David L. Woodland,*par Peter C. Doherty,*§par and Marcia A. Blackman*par

From the * Department of Immunology, Dagger  Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105; and the § Department of Pediatrics, par  Department of Pathology, University of Tennessee, Memphis, Tennessee 38163

The murine gamma -herpesvirus 68 has many similarities to EBV, and induces a syndrome comparable to infectious mononucleosis (IM). The frequency of activated CD8+ T cells (CD62Llo) in the peripheral blood increased greater than fourfold by 21 d after infection of C57BL/6J (H-2b) mice, and remained high for at least a further month. The spectrum of T cell receptor usage was greatly skewed, with as many as 75% of the CD8+ T cells in the blood expressing a Vbeta 4+ phenotype. Interestingly, the Vbeta 4 dominance was also seen, to varying extents, in H-2k, H-2d, H-2u, and H-2q strains of mice. In addition, although CD4 depletion from day 11 had no effect on the Vbeta 4 bias of the T cells, the Vbeta 4+CD8+ expansion was absent in H-2IAb-deficient congenic mice. However, the numbers of cycling cells in the CD4 antibody-depleted mice and mice that are CD4 deficient as a consequence of the deletion of MHC class II, were generally lower. The findings suggest that the IM-like disease is driven both by cytokines provided by CD4+ T cells and by a viral superantigen presented by MHC class II glycoproteins to Vbeta 4+CD8+ T cells.


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