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J. Virol., May 1996, 3039-3044, Vol 70, No. 5
SA Huber, A Mortensen and G Moulton
Two variants of coxsackievirus B3 have been used to investigate the
pathogenesis of myocarditis in BALB/c mice. H3 virus induces moderate
myocarditis and H310A1 virus induces minimal myocarditis, although both
viruses infect and replicate in the heart. Cells expressing the gamma
delta+ T-cell receptor composed 5 to 13% of the lymphocytes infiltrating
the hearts of H3 virus-infected mice and belonged to either the CD4- CD8+
gamma delta+- or CD4- CD8- gamma delta+-cell population. Giving 5,000 gamma
delta+ cells isolated from the hearts of H3 virus-infected mice to H310A1
virus-infected recipients restored myocarditis susceptibility in the
recipient animals and shifted the pattern of cytokine production in the
virus-immune CD4+-cell population from being predominantly interleukin-4
producing to being predominantly gamma interferon producing in the H310A1
virus-infected mice. Apoptosis was evident in the infiltrating lymphocyte
population in the myocardia of H3 virus-infected mice by the terminal
deoxynucleotidyl transferase- mediated dUTP-biotin nick-end labeling assay
and in splenic lymphocytes by DNA fragmentation in agarose gel
electrophoresis and was confined to the CD4+ population. No apoptosis was
observed in H310A1 virus-infected mice, but apoptosis was induced
subsequent to gamma delta +-T-cell transfer. These results are consistent
with the hypothesis that gamma delta+ T cells may help modulate cytokine
responses during virus infections in vivo and that apoptosis might be
involved in this modulation.
Copyright © 1996, American Society for Microbiology
Modulation of cytokine expression by CD4+ T cells during coxsackievirus B3 infections of BALB/c mice initiated by cells expressing the gamma delta + T-cell receptor
Department of Pathology, University of Vermont, Burlington 05405, USA.
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