alexa Induction of LIF-mRNA by TGF-beta 1 in Schwann cells.
Neurology

Neurology

International Journal of Neurorehabilitation

Author(s): Matsuoka I, Nakane A, Kurihara K

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Abstract Schwann cell is a cell type that forms myelin sheath and provides trophic supports for neuronal cells by producing neurotrophic factors such as neurotrophins and neurokines in both normal and traumatic situations. It was recently reported that after lesion of sciatic nerve, mRNA for cholinergic differentiation factor (CDF)/leukemia inhibitory factor (LIF) is induced in nonneuronal cells in the nerve. However, the source of LIF-mRNA and the mechanism of LIF-mRNA regulation have remained largely unknown. In the present study, we searched for factors regulating the LIF-mRNA expression in cultured Schwann cells isolated from newborn rat sciatic nerve. Among various growth factors and cytokines tested, TGF beta-1 exerted the most prominent effect on the induction of LIF-mRNA in the cultured Schwann cells. The effect of TGF-beta 1 on the increase of LIF-mRNA levels was suppressed by either staurosporine or H-7 suggesting the role of PKC or PKC-like protein kinase activity in the induction of LIF-mRNA. The induction of LIF mRNA by TGF-beta 1 was suppressed in the co-culture of the Schwann cells with embryonic rat DRG neurons. The addition of ascorbic acid, which is known to promote myelination in this co-culture system, further suppressed the TGF-beta 1 induction of LIF-mRNA. These results suggest that Schwann cells respond to TGF-beta 1 in a lesion situation to produce LIF, which supports neuronal survival and regeneration. The re-establishment of neuron-Schwann cell interaction would in turn suppress the LIF production to terminate its action during the lesion situation.
This article was published in Brain Res and referenced in International Journal of Neurorehabilitation

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