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- W2083511272 abstract "Objectives: In vitro, neural stem cells (NSCs) proliferate as undifferentiated spheroids and differentiate into neurons, astrocytes and oligodendrocytes. These features make NSCs suitable for spinal cord (SC) reconstruction. However, in vivo experiments have demonstrated that in the injured SC transplanted NSCs either remain undifferentiated or differentiate into the astrocytic phenotype. The microenvironment of the injured SC is believed to play a crucial role in driving the differentiation of the engrafted NSCs. Here, we tested the hypothesis that inflammatory cytokines (ICs) may be involved in the restricted differentiation of NSCs after grafting onto the injured SC. Methods: As the first step, we used immunohistochemistry to analyse the expression of tumor necrosis factor (TNF)-α, interleukin (IL)-1β and interferon (IFN)-γ in the normal SC of mice and following traumatic injury. Then, we investigated whether a combination of TNF-α, IL-1β and IFN-γ may affect the phenotype of murine NSCs in vitro. Results: We found that TNF-α, IL–1β and IFN-γ, which are absent in the normal SC, are all expressed in the injured SC and the expression of these cytokines follows a timely tuned fashion with IFN-γ being detectable as long as 4 weeks after injury. In culture, exposure of proliferating NSCs to a combination of TNF-α, IL–1β and IFN-γ was per se sufficient to induce the astrocytic differentiation of these cells even in the absence of serum. Conclusions: In the traumatically injured SC, differentiation of engrafted NSCs is restricted towards the astrocytic lineage because of the inflammatory environment. ICs are likely to play a major role in differentiation of NSCs in the in vivo conditions." @default.
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- W2083511272 date "2006-07-01" @default.
- W2083511272 modified "2023-10-17" @default.
- W2083511272 title "Influence of local environment on the differentiation of neural stem cells engrafted onto the injured spinal cord" @default.
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- W2083511272 doi "https://doi.org/10.1179/016164106x115134" @default.
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