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6+ and V
4+ T Cells Exert Cooperative Activity in Clearance of Secondary Infection with Histoplasma capsulatum1




*
Research Division, Veterans Administration Medical Center, Cincinnati, OH 45202;
Division of Infectious Diseases, University of Cincinnati School of Medicine, Cincinnati, OH 45267
We previously studied the lung V
TCR repertoire of C57BL/6 mice
during primary infection with the pathogen Histoplasma
capsulatum. We observed a consistent oligoclonal expansion of
V
4+ T cells during the peak of infection and early
stages of resolution. The V
4+ family played a role in
protective immunity against the fungus. Depletion of this subpopulation
of T cells hindered optimal clearance of infection from tissues. In
this report we analyze the flux of the V
TCR repertoire in the lungs
of C57BL/6 mice with reinfection histoplasmosis. We observed a
significant increase in V
6+ T cells on days 7, 10, and
14, the peak and early resolution phases of infection. This skewing was
preceded by an increased number of memory T cells within
V
6+ cells. The VDJ sequences of V
6 chains were
oligoclonal during the early stages of the infection, suggesting that
the expansion was driven by a small number of Ags. More than 96% of
the expanded V
6+ cells were CD4+. Depletion
of V
6+ T cells but not V
4+ T cells
induced a modest but significant delay in fungal clearance.
Simultaneous depletion of V
4+ and V
6+ T
cells induced a more pronounced impairment of host resistance. These
studies illustrate the dynamic interactions between V
families in
the response to microbial challenge.
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