Signal transducer and activator of transcription-3/suppressor of cytokine signaling-3 (STAT3/SOCS3) axis in myeloid cells regulates neuroinflammation

H Qin, WI Yeh, P De Sarno… - Proceedings of the …, 2012 - National Acad Sciences
H Qin, WI Yeh, P De Sarno, AT Holdbrooks, Y Liu, MT Muldowney, SL Reynolds…
Proceedings of the National Academy of Sciences, 2012National Acad Sciences
Suppressor of cytokine signaling (SOCS) proteins are feedback inhibitors of the JAK/STAT
pathway. SOCS3 has a crucial role in inhibiting STAT3 activation, cytokine signaling, and
inflammatory gene expression in macrophages/microglia. To determine the role of SOCS3 in
myeloid cells in neuroinflammation, mice with conditional SOCS3 deletion in myeloid cells
(LysMCre-SOCS3fl/fl) were tested for experimental autoimmune encephalomyelitis (EAE).
The myeloid-specific SOCS3-deficient mice are vulnerable to myelin oligodendrocyte …
Suppressor of cytokine signaling (SOCS) proteins are feedback inhibitors of the JAK/STAT pathway. SOCS3 has a crucial role in inhibiting STAT3 activation, cytokine signaling, and inflammatory gene expression in macrophages/microglia. To determine the role of SOCS3 in myeloid cells in neuroinflammation, mice with conditional SOCS3 deletion in myeloid cells (LysMCre-SOCS3fl/fl) were tested for experimental autoimmune encephalomyelitis (EAE). The myeloid-specific SOCS3-deficient mice are vulnerable to myelin oligodendrocyte glycoprotein (MOG)-induced EAE, with a severe, nonresolving atypical form of disease. In vivo, enhanced infiltration of inflammatory cells and demyelination is prominent in the cerebellum of myeloid-specific SOCS3-deficient mice, as is enhanced STAT3 signaling and expression of inflammatory cytokines/chemokines and an immune response dominated by Th1 and Th17 cells. In vitro, SOCS3-deficient macrophages exhibit heightened STAT3 activation and are polarized toward the classical M1 phenotype. SOCS3-deficient M1 macrophages provide the microenvironment to polarize Th1 and Th17 cells and induce neuronal death. Furthermore, adoptive transfer of M2 macrophages into myeloid SOCS3-deficient mice leads to delayed onset and reduced severity of atypical EAE by decreasing STAT3 activation, Th1/Th17 cells, and proinflammatory mediators in the cerebellum. These findings indicate that myeloid cell SOCS3 provides protection from EAE through deactivation of neuroinflammatory responses.
National Acad Sciences