Journal
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
Volume 24, Issue 24, Pages 14325-14338Publisher
WILEY
DOI: 10.1111/jcmm.16050
Keywords
IL‐ 6; macrophage; P21 Activated Kinase‐ 1; Th17 cell; Treg cell
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Funding
- National Natural Science Foundation of China [81702023]
- Natural Science Foundation of Jiangsu Province [BK20171049]
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CD4(+)T cells differentiate into distinct functional effector and inhibitory subsets are facilitated by distinct cytokine cues present at the time of antigen recognition. Maintaining a balance between T helper 17 (Th17) and regulatory T (Treg) cells are critical for the control of the immunopathogenesis of liver diseases. Here, by using the mouse model of helminth Schistosoma japonicum (S japonicum) infection, we show that the hepatic mRNA levels of P21-activated kinase 1 (PAK1), a key regulator of the actin cytoskeleton, adhesion and cell motility, are significantly increased and associated with the development of liver pathology during S japonicum infection. In addition, PAK1-deficient mice are prone to suppression of Th17 cell responses but increased Treg cells. Furthermore, PAK1 enhances macrophage activation through promoting IRF1 nuclear translocation in an NF-kappa B-dependent pathway, resulting in promoting Th17 cell differentiation through inducing IL-6 production. These findings highlight the importance of PAK1 in macrophages fate determination and suggest that PAK1/IRF1 axis-dependent immunomodulation can ameliorate certain T cell-based immune pathologies.
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