title: Cell type-associated differences in migration, survival, and immunogenicity following grafting in CNS tissue.
abstract: Cell transplantation has been suggested to display several neuroprotective and/or neuroregenerative effects in animal models of central nervous system (CNS) trauma. However, while most studies report on clinical observations, currently little is known regarding the actual fate of the  cell populations grafted and whether or how the brain's innate immune system, mainly directed by activated microglia and astrocytes, interacts with autologous cellular implants. In this study, we grafted well-characterized neural stem cell, mouse embryonic fibroblast, dendritic cell, bone  marrow mononuclear cell, and splenocyte populations, all isolated or cultured from C57BL/6-eGFP transgenic mice, below the capsula externa (CE) of healthy C57BL/6 mice and below the inflamed/demyelinated CE of cuprizone-treated C57BL/6 mice. Two weeks postgrafting, an extensive quantitative  multicolor histological analysis was performed in order (i) to quantify cell graft localization, migration, survival, and toxicity and (ii) to characterize endogenous CNS immune responses against the different cell grafts. Obtained results indicate dependence on the cell type grafted: (i)  a different degree of cell graft migration, survival, and toxicity and (ii) a different organization of the endogenous immune response. Based on these observations, we warrant that further research should be undertaken to understand-and eventually control-cell graft-induced tissue  damage and activation of the brain's innate immune system. The latter will be inevitable before cell grafting in the CNS can be performed safely and successfully in clinical settings.
authors.affiliation: Laboratory of Experimental Hematology, University of Antwerp, Antwerp, Belgium.
authors.forename: Jelle
authors.initials: J
authors.lastname: Praet
authors.forename: Kristien
authors.initials: K
authors.lastname: Reekmans
authors.forename: Dan
authors.initials: D
authors.lastname: Lin
authors.forename: Nathalie
authors.initials: N
authors.lastname: De Vocht
authors.forename: Irene
authors.initials: I
authors.lastname: Bergwerf
authors.forename: Bart
authors.initials: B
authors.lastname: Tambuyzer
authors.forename: Jasmijn
authors.initials: J
authors.lastname: Daans
authors.forename: Niel
authors.initials: N
authors.lastname: Hens
authors.forename: Herman
authors.initials: H
authors.lastname: Goossens
authors.forename: Patrick
authors.initials: P
authors.lastname: Pauwels
authors.forename: Zwi
authors.initials: Z
authors.lastname: Berneman
authors.forename: Annemie
authors.initials: A
authors.lastname: Van der Linden
authors.forename: Peter
authors.initials: P
authors.lastname: Ponsaerts
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D002490:Central Nervous System / Q000166:cytology / Q000601:surgery; D005260:Female; D006085:Graft Survival / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D033581:Stem Cell Transplantation; D016019:Survival Analysis; D020196:Trauma, Nervous System / Q000473:pathology* / Q000601:surgery*