alexa Primed antigen-specific CD4+ T cells are required for NK cell activation in vivo upon Leishmania major infection.
Infectious Diseases

Infectious Diseases

Journal of Clinical Infectious Diseases & Practice

Author(s): Bihl F, Pecheur J, Brart B, Poupon G, Cazareth J, , Bihl F, Pecheur J, Brart B, Poupon G, Cazareth J,

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Abstract The ability of NK cells to rapidly produce IFN-gamma is an important innate mechanism of resistance to many pathogens including Leishmania major. Molecular and cellular components involved in NK cell activation in vivo are still poorly defined, although a central role for dendritic cells has been described. In this study, we demonstrate that Ag-specific CD4(+) T cells are required to initiate NK cell activation early on in draining lymph nodes of L. major-infected mice. We show that early IFN-gamma secretion by NK cells is controlled by IL-2 and IL-12 and is dependent on CD40/CD40L interaction. These findings suggest that newly primed Ag-specific CD4(+) T cells could directly activate NK cells through the secretion of IL-2 but also indirectly through the regulation of IL-12 secretion by dendritic cells. Our results reveal an unappreciated role for Ag-specific CD4(+) T cells in the initiation of NK cell activation in vivo upon L. major infection and demonstrate bidirectional regulations between innate and adaptive immunity. This article was published in J Immunol and referenced in Journal of Clinical Infectious Diseases & Practice

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