IL-17A induces MIP-1α expression in primary astrocytes via Src/MAPK/PI3K/NF-kB pathways: implications for multiple
Hongwei Yi1, Ying Bai, Xinjian Zhu
1Department of Pharmacology, Medical School of Southeast University, Nanjing, China.
Summary
Interleukin-17 (IL-17) induces macrophage inflammatory protein-1α (MIP-1α) in astrocytes, a key pathway in multiple sclerosis (MS) neuroinflammation. This finding highlights MIP-1α as a potential therapeutic target for MS.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Neuroinflammation is central to multiple sclerosis (MS) pathogenesis.
- Astrocytes and their mediators, like macrophage inflammatory protein-1α (MIP-1α), contribute to MS.
- The role of IL-17 in modulating MIP-1α in astrocytes is largely unexplored.
Purpose of the Study:
- To investigate the mechanism of IL-17-mediated induction of MIP-1α in astrocytes.
- To explore the signaling pathways involved in this induction.
- To determine the role of MIP-1α in IL-17-induced astrocyte activation and its relevance in experimental autoimmune encephalomyelitis (EAE).
Main Methods:
- Primary rat astrocytes were treated with IL-17 to assess MIP-1α expression.
- Signaling pathways including Src, MAPKs, PI3K/Akt, and NF-kB were analyzed.
- Primary mouse astrocytes were used to evaluate IL-17 effects on glial fibrillary acidic protein (GFAP) expression in the presence of MIP-1α neutralizing antibodies.
- EAE mice models were used to assess in vivo astrocyte activation and MIP-1α expression.
Main Results:
- IL-17 significantly induced MIP-1α expression in rat primary astrocytes via IL-17RA.
- This induction was mediated by Src, MAPKs, PI3K/Akt, and NF-kB signaling pathways.
- IL-17 increased GFAP expression in mouse astrocytes, an effect dependent on MIP-1α.
- EAE mice showed increased astrocyte activation and MIP-1α expression in the corpus callosum.
Conclusions:
- IL-17 directly induces MIP-1α expression in astrocytes through specific signaling cascades.
- MIP-1α plays a crucial role in IL-17-driven astrocyte activation.
- Targeting the IL-17-MIP-1α axis in astrocytes may offer a novel therapeutic strategy for MS-related neuroinflammation.
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