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Macrophage Migration Inhibitory Factor Mediates Neuroprotective Effects by Regulating Inflammation, Apoptosis and
Siying Li1, Kun Nie2, Qingxi Zhang2
1The Second School of Clinical Medicine, Southern Medical University, No.1023, South Shatai Road, Baiyun District, Guangzhou, 510515, PR China.
Abstract:
The influence of neuroinflammation in the development and progression of Parkinson's disease (PD) remains unknown. Macrophage migration inhibitory factor (MIF) is a multipotent and key cytokine involved in the pathogenesis of acute and chronic inflammatory and immune disorders. The aim of this study was to investigate the neuroprotective effects mediated by MIF in PD. Cellular apoptosis was measured by RT-qPCR analysis, fluorescence-activated cell sorting (FACS) analysis and western blotting. JC-1 staining was used to analyze the mitochondrial membrane potential (MMP). The formation of autophagosomes was detected by western blot analysis. Autophagic flux was assessed by tandem mRFP-GFP-LC3 fluorescence microscopy. Expression of MIF, cleaved-PARP and LC3B-II was increased significantly in both acute and chronic PD animal models. MIF was positively associated with IL-10 (P < 0.001), but inversely with TNF-α (P < 0.05). The PD cells (1 mM MPP+ treated group) showed an increase in early-apoptotic cells by FACS. Upregulating MIF expression resulted in a lower concentration of cleaved-PARP than the control group (P < 0.001). The MMP was higher in the MIF upregulated group than in the MIF knockdown group (P < 0.001). Upregulating MIF expression resulted in a higher concentration of LC3B-II than the control group (P < 0.001). Finally, LC3 puncta were markedly increased in the MIF upregulated group and in the MIF + MPP+ group. This study indicates that MIF mediates a neuroprotective effect via suppressing inflammatory responses, inhibiting apoptosis and inducing autophagy in PD.
Insights
Macrophage migration inhibitory factor (MIF) shows neuroprotective effects in Parkinson's disease (PD) models. Upregulating MIF suppresses inflammation, reduces apoptosis, and enhances autophagy, offering a potential therapeutic strategy for PD.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Neuroinflammation plays a critical role in Parkinson's disease (PD) pathogenesis, but its precise influence remains unclear.
- Macrophage migration inhibitory factor (MIF) is a key cytokine implicated in inflammatory and immune responses.
Purpose of the Study:
- To investigate the potential neuroprotective effects of MIF in Parkinson's disease.
- To elucidate the mechanisms by which MIF influences cellular apoptosis, mitochondrial function, and autophagy in PD models.
Main Methods:
- Utilized RT-qPCR, FACS, and Western blotting to assess cellular apoptosis and protein expression (MIF, cleaved-PARP, LC3B-II).
- Measured mitochondrial membrane potential (MMP) using JC-1 staining.
- Analyzed autophagosome formation and autophagic flux via Western blot and mRFP-GFP-LC3 fluorescence microscopy.
Main Results:
- MIF expression was elevated in PD models and positively correlated with IL-10, inversely with TNF-α.
- Upregulating MIF reduced apoptosis (decreased cleaved-PARP) and increased MMP compared to controls.
- MIF upregulation enhanced autophagy, evidenced by increased LC3B-II and LC3 puncta.
Conclusions:
- MIF exhibits significant neuroprotective effects in Parkinson's disease.
- MIF mediates these effects by suppressing inflammatory responses, inhibiting apoptosis, and promoting autophagy.
- Targeting MIF represents a promising therapeutic avenue for Parkinson's disease treatment.
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