Related Experiment Video
Updated: Aug 25, 2025
10:11
Facial Nerve Axotomy in Mice: A Model to Study Motoneuron Response to Injury
Published on: February 23, 2015
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Cellular Sources and Neuroprotective Roles of Interleukin-10 in the Facial Motor Nucleus after Axotomy
Elizabeth M Runge1,2,3, Deborah O Setter1,2,4, Abhirami K Iyer1,2,5
1Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Cells
|October 14, 2022
Summary
Facial motoneuron survival after nerve injury requires coordinated interleukin-10 (IL-10) production from both neurons and astrocytes. Neither cell type alone is sufficient for neuroprotection, highlighting a collaborative role in nerve repair.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Facial motoneuron (FMN) survival post-facial nerve axotomy (FNA) depends on CD4+ T cells and interleukin-10 (IL-10).
- CD4+ T cells are not the primary source of neuroprotective IL-10.
- The cellular origins and specific roles of IL-10 in FMN survival after injury remain unclear.
Purpose of the Study:
- To identify the temporal and cell-specific induction of IL-10 expression in the facial motor nucleus following FNA.
- To elucidate the neuroprotective capacity of IL-10 expression in FMN survival after axotomy.
Main Methods:
- Immunohistochemistry to detect IL-10 expression in FMN, astrocytes, and microglia.
- Analysis of Il10 mRNA localization.
- Cre/Lox mouse models to selectively knock out IL-10 in neurons, astrocytes, and microglia.
Main Results:
- Facial motoneurons constitutively produce IL-10; astrocytes upregulate IL-10 production after FNA.
- Il10 mRNA localizes with microglia, but microglia do not produce detectable IL-10 protein.
- Selective knockout of IL-10 in neurons, astrocytes, or microglia individually did not impair FMN survival, indicating no single source is solely responsible.
Conclusions:
- Coordinated IL-10 production by both neurons and astrocytes is essential for FMN survival after FNA.
- This collaborative IL-10 signaling plays a role in both neuronal homeostasis and neuroprotection following nerve injury.
- The findings suggest a complex interplay between glial and neuronal cells in mediating neuroprotection.
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