CD4+ T cell expression of the IL-10 receptor is necessary for facial motoneuron survival after axotomy

Journal of Neuroinflammation

Felicia M. Kennedy¹  Elizabeth M. Runge¹  Kathryn J. Jones¹  Deborah O. Setter¹  Virginia M. Sanders²  Abhirami K. Iyer³ 

[1] Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine;Department of Cancer Biology and Genetics, The Ohio State University;Department of Neuroscience, Washington University School of Medicine;

关键词: Autoimmune;    Axotomy;    IL-10;    Motoneuron;    Nerve injury;    Neuroprotection;   

DOI  :  10.1186/s12974-020-01772-x

来源: DOAJ

【 摘 要 】

Abstract Background After peripheral nerve transection, facial motoneuron (FMN) survival depends on an intact CD4+ T cell population and a central source of interleukin-10 (IL-10). However, it has not been determined previously whether CD4+ T cells participate in the central neuroprotective IL-10 cascade after facial nerve axotomy (FNA). Methods Immunohistochemical labeling of CD4+ T cells, pontine vasculature, and central microglia was used to determine whether CD4+ T cells cross the blood-brain barrier and enter the facial motor nucleus (FMNuc) after FNA. The importance of IL-10 signaling in CD4+ T cells was assessed by performing adoptive transfer of IL-10 receptor beta (IL-10RB)-deficient CD4+ T cells into immunodeficient mice prior to injury. Histology and qPCR were utilized to determine the impact of IL-10RB-deficient T cells on FMN survival and central gene expression after FNA. Flow cytometry was used to determine whether IL-10 signaling in T cells was necessary for their differentiation into neuroprotective subsets. Results CD4+ T cells were capable of crossing the blood-brain barrier and associating with reactive microglial nodules in the axotomized FMNuc. Full induction of central IL-10R gene expression after FNA was dependent on CD4+ T cells, regardless of their own IL-10R signaling capability. Surprisingly, CD4+ T cells lacking IL-10RB were incapable of mediating neuroprotection after axotomy and promoted increased central expression of genes associated with microglial activation, antigen presentation, T cell co-stimulation, and complement deposition. There was reduced differentiation of IL-10RB-deficient CD4+ T cells into regulatory CD4+ T cells in vitro. Conclusions These findings support the interdependence of IL-10- and CD4+ T cell-mediated mechanisms of neuroprotection after axotomy. CD4+ T cells may potentiate central responsiveness to IL-10, while IL-10 signaling within CD4+ T cells is necessary for their ability to rescue axotomized motoneuron survival. We propose that loss of IL-10 signaling in CD4+ T cells promotes non-neuroprotective autoimmunity after FNA.

【 授权许可】

Unknown