Metformin Promotes the Protection of Mice Infected With Plasmodium yoelii Independently of ?? T Cell Expansion.
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ABSTRACT: Adaptive immune responses are critical for protection against infection with Plasmodium parasites. The metabolic state dramatically changes in T cells during activation and the memory phase. Recent findings suggest that metformin, a medication for treating type-II diabetes, enhances T-cell immune responses by modulating lymphocyte metabolism. In this study, we investigated whether metformin could enhance anti-malaria immunity. Mice were infected with Plasmodium yoelii and administered metformin. Levels of parasitemia were reduced in treated mice compared with those in untreated mice, starting at ~2 weeks post-infection. The number of ?? T cells dramatically increased in the spleens of treated mice compared with that in untreated mice during the later phase of infection, while that of ?? T cells did not. The proportions of V?1+ and V?2+ ?? T cells increased, suggesting that activated cells were selectively expanded. However, these ?? T cells expressed inhibitory receptors and had severe defects in cytokine production, suggesting that they were in a state of exhaustion. Metformin was unable to rescue the cells from exhaustion at this stage. Depletion of ?? T cells with antibody treatment did not affect the reduction of parasitemia in metformin-treated mice, suggesting that the effect of metformin on the reduction of parasitemia was independent of ?? T cells.
SUBMITTER: Miyakoda M
PROVIDER: S-EPMC6300485 | biostudies-literature | 2018
REPOSITORIES: biostudies-literature
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