CD300f immunoreceptor contributes to peripheral nerve regeneration by the modulation of macrophage inflammatory phenotype
Peluffo, Hugo (Institut Pasteur de Montevideo. Laboratorio de Neuroinflamación y Terapia Génica)
Solari-Saquieres, Patricia (Institut Pasteur de Montevideo. Laboratorio de Neuroinflamación y Terapia Génica)
Negro-Demontel, María Luciana (Institut Pasteur de Montevideo. Laboratorio de Neuroinflamación y Terapia Génica)
Francos Quijorna, Isaac (Universitat Autònoma de Barcelona. Institut de Neurociències)
Navarro, X. (Xavier) (Xavier) (Universitat Autònoma de Barcelona. Departament de Biologia Cel·lular, de Fisiologia i d'Immunologia)
López Vales, Rubén (Universitat Autònoma de Barcelona. Institut de Neurociències)
Sayós, Joan (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Lago, Natalia (Institut Pasteur de Montevideo. Laboratorio de Neuroinflamación y Terapia Génica)

Fecha:	2015
Resumen:	Background: It has recently become evident that activating/inhibitory cell surface immune receptors play a critical role in regulating immune and inflammatory processes in the central nervous system (CNS). The immunoreceptor CD300f expressed on monocytes, neutrophils, and mast cells modulates inflammation, phagocytosis, and outcome in models of autoimmune demyelination, allergy, and systemic lupus erythematosus. On the other hand, a finely regulated inflammatory response is essential to induce regeneration after injury to peripheral nerves since hematogenous macrophages, together with resident macrophages and de-differentiated Schwann cells, phagocyte distal axonal and myelin debris in a well-orchestrated inflammatory response. The possible roles and expression of CD300f and its ligands have not been reported under these conditions. Methods: By using quantitative PCR (QPCR) and CD300f-IgG2a fusion protein, we show the expression of CD300f and its ligands in the normal and crush injured sciatic nerve. The putative role of CD300f in peripheral nerve regeneration was analyzed by blocking receptor-ligand interaction with the same CD300f-IgG2a soluble receptor fusion protein in sciatic nerves of Thy1-YFP-H mice injected at the time of injury. Macrophage M1/M2 polarization phenotype was also analyzed by CD206 and iNOS expression. Results: We found an upregulation of CD300f mRNA and protein expression after injury. Moreover, the ligands are present in restricted membrane patches of Schwann cells, which remain stable after the lesion. The lesioned sciatic nerves of Thy1-YFP-H mice injected with a single dose of CD300f-IgG2a show long lasting effects on nerve regeneration characterized by a lower number of YFP-positive fibres growing into the tibial nerve after 10 days post lesion (dpl) and a delayed functional recovery when compared to PBS- or IgG2a-administered control groups. Animals treated with CD300f-IgG2a show at 10 dpl higher numbers of macrophages and CD206-positive cells and lower levels of iNOS expression than both control groups. At later time points (28 dpl), increased numbers of macrophages and iNOS expression occur. Conclusions: Taken together, these results show that the pair CD300f ligand is implicated in Wallerian degeneration and nerve regeneration by modulating both the influx and phenotype of macrophages.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Regeneration ; Immunoreceptors ; CD300 ; Macrophage M1/M2 phenotype ; Schwann cell ; Wallerian degeneration ; Phagocytosis
Publicado en:	Journal of neuroinflammation, Vol. 12, No. 145 (2015) , ISSN 1742-2094

DOI: 10.1186/s12974-015-0364-y
PMID: 26259611

15 p, 2.1 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias de la salud y biociencias > Institut de Neurociències (INc)
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