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• W2283082013 abstract "Toll-like receptor (TLR) 4 mediates inflammation and is also known to trigger apoptosis in microglia. Our time-lapse observations showed that lipopolysaccharide (LPS) stimulation induced rapid death in primary cultures of rat microglia, while a portion of the microglia escaped from death and survived for much longer than 2 days, in which time, all of the control cells had died. However, it remains unclear how the LPS-stimulated microglia subpopulation could continue to survive in the absence of any supplied growth factors. In the present study, to clarify the mechanism underlying the LPS-stimulated survival, we investigated whether microglia could produce their own survival factors in response to LPS, focusing on macrophage colony-stimulating factor (M-CSF), granulocyte macrophage colony-stimulating factor (GM-CSF) and interleukin (IL)-34, which are mainly supplied by astrocytes or neurons. The LPS-stimulated microglia drastically induced the expression of the GM-CSF mRNA and protein, while M-CSF and IL-34 levels were unchanged. The surviving microglia also significantly upregulated the expression of GM-CSF receptor (GM-CSFR) mRNA without affecting M-CSFR. As for the GM-CSFR downstream signal, LPS resulted in the phosphorylation of STAT5 and its translocation to the nucleus in the surviving microglia. Moreover, a specific JAK2 inhibitor, NVP-BSK805, suppressed STAT5 phosphorylation and microglia survival in response to LPS, indicating a critical role of the JAK2/STAT5 pathway in this survival mechanism. Together, these results suggest that a subpopulation of TLR4-activated microglia may survive by producing GM-CSF and up-regulating GM-CSFR. This autocrine GM-CSF pathway may activate the JAK2/STAT5 signaling pathway, which controls the transcription of survival-related genes. Finally, these surviving microglia may have neuroprotective functions because the neurons remained viable in co-cultures with these microglia." @default.
• W2283082013 created "2016-06-24" @default.
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• W2283082013 date "2016-02-01" @default.
• W2283082013 modified "2023-10-13" @default.
• W2283082013 title "The Toll-like receptor 4-activated neuroprotective microglia subpopulation survives via granulocyte macrophage colony-stimulating factor and JAK2/STAT5 signaling" @default.
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• W2283082013 doi "https://doi.org/10.1016/j.neuint.2016.01.003" @default.
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