Cellular Sources and Neuroprotective Roles of Interleukin-10 in the Facial Motor Nucleus after Axotomy

Elizabeth M. Runge, Deborah O. Setter, Abhirami K. Iyer, Eric J. Regele, Felicia M. Kennedy, Virginia M. Sanders, Kathryn J. Jones

Research output: Contribution to journalArticlepeer-review

Abstract

Facial motoneuron (FMN) survival is mediated by CD4+ T cells in an interleukin-10 (IL-10)-dependent manner after facial nerve axotomy (FNA), but CD4+ T cells themselves are not the source of this neuroprotective IL-10. The aims of this study were to (1) identify the temporal and cell-specific induction of IL-10 expression in the facial motor nucleus and (2) elucidate the neuroprotective capacity of this expression after axotomy. Immunohistochemistry revealed that FMN constitutively produced IL-10, whereas astrocytes were induced to make IL-10 after FNA. Il10 mRNA co-localized with microglia before and after axotomy, but microglial production of IL-10 protein was not detected. To determine whether any single source of IL-10 was critical for FMN survival, Cre/Lox mouse strains were utilized to selectively knock out IL-10 in neurons, astrocytes, and microglia. In agreement with the localization data reflecting concerted IL-10 production by multiple cell types, no single cellular source of IL-10 alone could provide neuroprotection after FNA. These findings suggest that coordinated neuronal and astrocytic IL-10 production is necessary for FMN survival and has roles in neuronal homeostasis, as well as neuroprotective trophism after axotomy.

Original languageEnglish
Article number3167
JournalCells
Volume11
Issue number19
DOIs
StatePublished - Oct 2022

Keywords

  • CD4+ T cell
  • IL-10
  • astrocyte
  • axotomy
  • facial nerve
  • motoneuron
  • nerve injury
  • neuroprotection

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