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- W2109553638 abstract "The macrophage-expressed CD40 regulates immune responses to Leishmania major infection by reciprocal signaling through p38 MAPK and ERK1/2. CD40-induced IL-10 or IL-12 plays crucial roles in the promotion or protection from L. major infection, respectively. Because p38 MAPK and ERK1/2 are dephosphorylated by dual-specificity MAPK phosphatases (MKPs), we tested the role of CD40 in the regulation of MKPs in L. major infection. MKP-1 expression and activity increased whereas MKP-3 expression and activity decreased in virulent L. major-infected macrophages. CD40 differentially regulated the expression and activity of MKP-1 and MKP-3, which, in turn, reciprocally regulated CD40-induced p38 MAPK and ERK1/2 phosphorylation and effector functions in macrophages. Triptolide, an inhibitor of MKP-1 expression, and lentivirally expressed MKP-1 short hairpin RNA enhanced CD40-induced anti-leishmanial functions and significantly protected susceptible BALB/c mice from L. major infection. Similarly, lentivirally overexpressed MKP-3 significantly reduced disease progression and parasite burden in susceptible BALB/c mice. Thus, to our knowledge, our data show for the first time that CD40 reciprocally regulates MKP-1 and MKP-3 expression and activity while the MKPs contribute to the reciprocal CD40 signaling-regulated anti-leishmanial functions. The findings reveal a novel parasite-devised immune evasion strategy and an effective target to redirect CD40-regulated immune responses." @default.
- W2109553638 created "2016-06-24" @default.
- W2109553638 creator A5024742527 @default.
- W2109553638 creator A5052225075 @default.
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- W2109553638 date "2011-05-15" @default.
- W2109553638 modified "2023-10-12" @default.
- W2109553638 title "CD40-Modulated Dual-Specificity Phosphatases MAPK Phosphatase (MKP)-1 and MKP-3 Reciprocally Regulate <i>Leishmania major</i> Infection" @default.
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- W2109553638 doi "https://doi.org/10.4049/jimmunol.1003957" @default.
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