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Glutathione S -transferases promote proinflammatory astrocyte-microglia communication during brain inflammation.
Science Signaling 2019 Februrary 20
Astrocytes and microglia play critical roles in brain inflammation. Here, we report that glutathione S -transferases (GSTs), particularly GSTM1, promote proinflammatory signaling in astrocytes and contribute to astrocyte-mediated microglia activation during brain inflammation. In vivo, astrocyte-specific knockdown of GSTM1 in the prefrontal cortex attenuated microglia activation in brain inflammation induced by systemic injection of lipopolysaccharides (LPS). Knocking down GSTM1 in astrocytes also attenuated LPS-induced production of the proinflammatory cytokine tumor necrosis factor-α (TNF-α) by microglia when the two cell types were cocultured. In astrocytes, GSTM1 was required for the activation of nuclear factor κB (NF-κB) and the production of proinflammatory mediators, such as granulocyte-macrophage colony-stimulating factor (GM-CSF) and C-C motif chemokine ligand 2 (CCL2), both of which enhance microglia activation. Our study suggests that GSTs play a proinflammatory role in priming astrocytes and enhancing microglia activation in a microglia-astrocyte positive feedback loop during brain inflammation.
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