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Myelin Oligodendrocyte Glycoprotein MOG35-55 Induced Experimental Autoimmune Encephalomyelitis EAE in C57BL/6 Mice
Published on: April 15, 2014
Insulin-like growth factor-binding protein 7 is up-regulated during EAE and inhibits the differentiation of
Weixing Tan1, Yingyan Pu1, Qi Shao1
1Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of the Ministry of Education, Second Military Medical University, Shanghai 200433, China.
Abstract:
Oligodendrocyte precursor cells (OPCs) differentiation failure is one of the leading causes for remyelination defects in the demyelinating lesions of multiple sclerosis (MS). In this study, we explored the roles of insulin-like growth factor-binding proteins 7 (IGFBP-7) on OPCs differentiation during experimental autoimmune encephalomyelitis (EAE). We first investigated the expression pattern of IGFBP-7 by real-time PCR and immunofluorescence staining. It showed that IGFBP-7 was expressed in astrocytes (ACs), oligodendrocytes (OLs) and neurons both in vitro and in vivo. The mRNA and protein level of IGFBP-7 was also increased in the spinal cord from mice at the peak of EAE disease. Next we found that IGFBP-7 acted as a negatively regulator of the OPCs differentiation. Together, these data suggest that IGFBP-7 was up regulated during EAE and inhibit the transition from OPCs to mature OLs, implying its use as a potential therapeutic target for the treatment of inflammatory demyelinating diseases.
Insights
Insulin-like growth factor-binding protein 7 (IGFBP-7) inhibits oligodendrocyte precursor cell (OPC) differentiation in multiple sclerosis models. Upregulated IGFBP-7 during experimental autoimmune encephalomyelitis suggests it as a therapeutic target for remyelination.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Demyelinating diseases like multiple sclerosis (MS) are characterized by impaired remyelination due to oligodendrocyte precursor cell (OPC) differentiation failure.
- Understanding the molecular mechanisms regulating OPC differentiation is crucial for developing effective MS therapies.
Purpose of the Study:
- To investigate the role of insulin-like growth factor-binding protein 7 (IGFBP-7) in OPC differentiation during experimental autoimmune encephalomyelitis (EAE), an MS model.
- To determine if IGFBP-7 expression changes during EAE and affects OPC maturation.
Main Methods:
- Real-time PCR and immunofluorescence staining were used to analyze IGFBP-7 expression in vitro and in vivo.
- Expression levels were assessed in spinal cord tissues from EAE mice at disease peak.
- The effect of IGFBP-7 on OPC differentiation was evaluated.
Main Results:
- IGFBP-7 was detected in astrocytes, oligodendrocytes, and neurons.
- Both mRNA and protein levels of IGFBP-7 were elevated in the spinal cord during the peak of EAE.
- IGFBP-7 was identified as a negative regulator of OPC differentiation, inhibiting the transition to mature oligodendrocytes.
Conclusions:
- IGFBP-7 is upregulated during EAE and suppresses OPC differentiation into mature oligodendrocytes.
- These findings highlight IGFBP-7 as a potential therapeutic target for promoting remyelination in inflammatory demyelinating diseases like MS.
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