Interferon-gamma ameliorates experimental autoimmune encephalomyelitis by inducing homeostatic adaptation of microglia
Compelling evidence has shown that interferon (IFN)-γ has dual effects in multiple sclerosis and in its animal model of experimental autoimmune encephalomyelitis (EAE), with results supporting both a pathogenic and beneficial function. However, the mechanisms whereby IFN-γ may promote neuroprotectio...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2023
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| In: |
Frontiers in immunology
Year: 2023, Volume: 14, Pages: 1-22 |
| ISSN: | 1664-3224 |
| DOI: | 10.3389/fimmu.2023.1191838 |
| Online Access: | Verlag, kostenfrei, Volltext: https://dx.doi.org/10.3389/fimmu.2023.1191838 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/fimmu.2023.1191838 
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| Author Notes: | Juan E. Tichauer, Gabriel Arellano, Eric Acuña, Luis F. González, Nirmal R. Kannaiyan, Paola Murgas, Concepción Panadero-Medianero, Jorge Ibañez-Vega, Paula I. Burgos, Eileah Loda, Stephen D. Miller, Moritz J. Rossner, Peter J. Gebicke-Haerter and Rodrigo Naves |
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| 245 | 1 | 0 | |a Interferon-gamma ameliorates experimental autoimmune encephalomyelitis by inducing homeostatic adaptation of microglia |c Juan E. Tichauer, Gabriel Arellano, Eric Acuña, Luis F. González, Nirmal R. Kannaiyan, Paola Murgas, Concepción Panadero-Medianero, Jorge Ibañez-Vega, Paula I. Burgos, Eileah Loda, Stephen D. Miller, Moritz J. Rossner, Peter J. Gebicke-Haerter and Rodrigo Naves |
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| 520 | |a Compelling evidence has shown that interferon (IFN)-γ has dual effects in multiple sclerosis and in its animal model of experimental autoimmune encephalomyelitis (EAE), with results supporting both a pathogenic and beneficial function. However, the mechanisms whereby IFN-γ may promote neuroprotection in EAE and its effects on central nervous system (CNS)-resident cells have remained an enigma for more than 30 years. In this study, the impact of IFN-γ at the peak of EAE, its effects on CNS infiltrating myeloid cells (MC) and microglia (MG), and the underlying cellular and molecular mechanisms were investigated. IFN-γ administration resulted in disease amelioration and attenuation of neuroinflammation associated with significantly lower frequencies of CNS CD11b+ myeloid cells and less infiltration of inflammatory cells and demyelination. A significant reduction in activated MG and enhanced resting MG was determined by flow cytometry and immunohistrochemistry. Primary MC/MG cultures obtained from the spinal cord of IFN-γ-treated EAE mice that were ex vivo re-stimulated with a low dose (1 ng/ml) of IFN-γ and neuroantigen, promoted a significantly higher induction of CD4+ regulatory T (Treg) cells associated with increased transforming growth factor (TGF)-β secretion. Additionally, IFN-γ-treated primary MC/MG cultures produced significantly lower nitrite in response to LPS challenge than control MC/MG. IFN-γ-treated EAE mice had a significantly higher frequency of CX3CR1high MC/MG and expressed lower levels of program death ligand 1 (PD-L1) than PBS-treated mice. Most CX3CR1highPD-L1lowCD11b+Ly6G- cells expressed MG markers (Tmem119, Sall2, and P2ry12), indicating that they represented an enriched MG subset (CX3CR1highPD-L1low MG). Amelioration of clinical symptoms and induction of CX3CR1highPD-L1low MG by IFN-γ were dependent on STAT-1. RNA-seq analyses revealed that in vivo treatment with IFN-γ promoted the induction of homeostatic CX3CR1highPD-L1low MG, upregulating the expression of genes associated with tolerogenic and anti-inflammatory roles and down-regulating pro-inflammatory genes. These analyses highlight the master role that IFN-γ plays in regulating microglial activity and provide new insights into the cellular and molecular mechanisms involved in the therapeutic activity of IFN-γ in EAE. | ||
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| 700 | 1 | |a Acuña, Eric |e VerfasserIn |4 aut | |
| 700 | 1 | |a González, Luis F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kannaiyan, Nirmal R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Murgas, Paola |e VerfasserIn |4 aut | |
| 700 | 1 | |a Panadero-Medianero, Concepción |e VerfasserIn |4 aut | |
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