Th1-Th2 Cross-Regulation Controls Early Leishmania Infection in the Skin by Modulating the Size of the Permissive Monocytic Host Cell Reservoir.

We report that prior to influencing activation, Th1/Th2 immunity first controls the size of the permissive host cell reservoir. During early Leishmania infection of the skin, IFN-γ- or STAT6-mediated changes in phagocyte activation were counteracted by changes in IFN-γ-mediated recruitment of permissive CCR2+ monocytes. Monocytes were required for early parasite expansion and acquired an alternatively activated phenotype despite the Th1 dermal environment required for their recruitment. Surprisingly, STAT6 did not enhance intracellular parasite proliferation, but rather modulated the size and permissiveness of the monocytic host cell reservoir via regulation of IFN-γ and IL-10. These observations expand our understanding of the Th1-Th2 paradigm during infection.
PMID: 32298657 [PubMed - as supplied by publisher]

Source: Cell Host and Microbe - April 12, 2020 Category: Microbiology Authors: Carneiro MB, Lopes ME, Hohman LS, Romano A, David BA, Kratofil R, Kubes P, Workentine ML, Campos AC, Vieira LQ, Peters NC Tags: Cell Host Microbe Source Type: research