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Updated: Aug 8, 2026
Measurement of γHV68 Infection in Mice
Published on: November 22, 2011
Requirement for CD4+ T cells in V beta 4+CD8+ T cell activation associated with latent murine gammaherpesvirus
E Flaño1, D L Woodland, M A Blackman
1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
Insights
CD4+ T cells are crucial for expanding a specific CD8+ T cell subset during murine gammaherpesvirus-68 infection. This expansion, linked to viral latency, appears to involve CD4+ T cell-mediated B cell activation influencing a key stimulatory ligand.
Area of Science:
- Immunology
- Virology
- T cell biology
Background:
- Murine gammaherpesvirus-68 infection establishes latency, associated with CD8+ T cell lymphocytosis.
- A significant proportion of activated CD8+ T cells express V beta 4+ TCR, with their specific ligand remaining unidentified.
- V beta 4+ CD8+ T cell activity correlates with viral latency establishment in the spleen.
Purpose of the Study:
- To investigate the role of CD4+ T cells in the expansion of V beta 4+ CD8+ T cells during murine gammaherpesvirus-68 infection.
- To determine the timing and mechanism of CD4+ T cell involvement in this T cell subset expansion.
- To explore the potential link between CD4+ T cell activity, B cell activation, and the expression of the V beta 4+ CD8+ T cell stimulatory ligand.
Main Methods:
- Analysis of CD8+ T cell subsets, specifically V beta 4+ TCR expression, in infected mice.
- Assessment of CD4+ T cell dependency for V beta 4+ CD8+ T cell expansion.
- Investigation of the role of Interferon-gamma (IFN-gamma) in CD4+ T cell-mediated effects.
- Utilizing T cell hybridomas from latently infected mice to evaluate stimulatory ligand activity.
Main Results:
- CD4+ T cells are essential for the expansion of the V beta 4+ CD8+ T cell subset in peripheral blood, but not other V beta subsets.
- CD4+ T cells mediate their effect between 7 and 11 days post-infection, independent of IFN-gamma.
- CD4+ T cells appear to control the levels of the stimulatory ligand driving V beta 4+ CD8+ T cell activation.
- V beta 4+ CD8+ T cell expansion correlates with activated B cell levels, suggesting a role for CD4+ T cell-driven B cell activation.
Conclusions:
- CD4+ T cells are indispensable for the expansion of the V beta 4+ CD8+ T cell subset during murine gammaherpesvirus-68 infection.
- The mechanism involves late-acting CD4+ T cells, potentially through B cell activation, influencing the expression of a critical stimulatory ligand.
- These findings highlight a novel CD4+ T cell-dependent pathway regulating specific CD8+ T cell responses in viral latency.
Abstract:
A CD8+ T cell lymphocytosis in the peripheral blood is associated with the establishment of latency following intranasal infection with murine gammaherpesvirus-68. Remarkably, a large percentage of the activated CD8+ T cells of mice expressing different MHC haplotypes express V beta 4+ TCR. Identification of the ligand driving the V beta 4+CD8+ T cell activation remains elusive, but there is a general correlation between V beta 4+CD8+ T cell stimulatory activity and establishment of latency in the spleen. In the current study, the role of CD4+ T cells in the V beta 4+CD8+ T cell expansion has been addressed. The results show that CD4+ T cells are essential for expansion of the V beta 4+CD8+ subset, but not other V beta subsets, in the peripheral blood. CD4+ T cells are required relatively late in the antiviral response, between 7 and 11 days after infection, and mediate their effect independently of IFN-gamma. Assessment of V beta 4+CD8+ T cell stimulatory activity using murine gammaherpesvirus-68-specific T cell hybridomas generated from latently infected mice supports the idea that CD4+ T cells control levels of the stimulatory ligand that drives the V beta 4+CD8+ T cells. As V beta 4+CD8+ T cell expansion also correlates with levels of activated B cells, these data raise the possibility that CD4+ T cell-mediated B cell activation is required for optimal expression of the stimulatory ligand. In addition, in cases of low ligand expression, there may also be a direct role for CD4+ T cell-mediated help for V beta 4+CD8+ T cells.
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