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Myelin Oligodendrocyte Glycoprotein (MOG35-55) Induced Experimental Autoimmune Encephalomyelitis (EAE) in C57BL/6 Mice
Published on: April 15, 2014
Accelerated axon loss in MOG35-55 experimental autoimmune encephalomyelitis (EAE) in myelin-associated
Melina V Jones1, Thien T Nguyen, Osefame Ewaleifoh
1Johns Hopkins University, Department of Neurology, Room 625, 600N. Wolfe Street, Baltimore 21287, MD, USA.
Abstract:
Myelin-associated glycoprotein (MAG) expressed by oligodendrocytes promotes the stability of axons but also impedes neural repair by inhibiting axon extension through lesioned white matter. We previously reported exacerbated axon losses in MAGKO as compared to wild type mice, 30days into experimental autoimmune encephalitis (EAE). Here, we report the time course of axon losses in EAE and show this occurs as early as 7days post-immunization, confirming MAG is protective against immune-mediated axon transection events. MAGKO mice also exhibit increased microglial activation prior to EAE, which is not seen in B4galnt1KO mice that also have axon loss, suggesting that the microglial activation may be a consequence of the loss of MAG inhibitory influence, and not a simple result of axonal degeneration.
Insights
Myelin-associated glycoprotein (MAG) protects axons from immune-mediated damage during experimental autoimmune encephalitis (EAE). Loss of MAG accelerates axon loss and increases microglial activation, highlighting its crucial role in neural repair.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Myelin-associated glycoprotein (MAG) is expressed by oligodendrocytes and influences axonal stability and neural repair.
- MAG inhibits axon extension in lesioned white matter.
- Previous studies showed increased axon loss in MAG knockout (MAGKO) mice during experimental autoimmune encephalitis (EAE).
Purpose of the Study:
- To investigate the time course of axon loss in EAE.
- To confirm the protective role of MAG against immune-mediated axon transection.
- To explore the relationship between MAG deficiency, microglial activation, and axonal degeneration.
Main Methods:
- Experimental autoimmune encephalitis (EAE) induction in wild-type and MAG knockout (MAGKO) mice.
- Assessment of axon loss at different time points post-immunization.
- Analysis of microglial activation in MAGKO and B4galnt1 knockout (B4galnt1KO) mice.
Main Results:
- Axon loss in EAE occurs as early as 7 days post-immunization.
- MAG deficiency exacerbates axon loss in EAE.
- MAGKO mice show increased microglial activation prior to EAE onset, unlike B4galnt1KO mice.
Conclusions:
- MAG is protective against immune-mediated axon transection during EAE.
- Early microglial activation in MAGKO mice may result from the loss of MAG's inhibitory influence, not solely axonal degeneration.
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