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Regulation of ceramide synthase 6 in a spontaneous experimental autoimmune encephalomyelitis model is sex dependent

 
: Eberle, M.; Ebel, P.; Wegner, M.S.; Männich, J.; Tafferner, N.; Ferreiros, N.; Birod, K.; Schreiber, Y.; Krishnamoorthy, G.; Willecke, K.; Geisslinger, G.; Grösch, S.; Schiffmann, S.

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Biochemical pharmacology 92 (2014), No.2, pp.326-335
ISSN: 0006-2952
ISSN: 1873-2968
English
Journal Article
Fraunhofer IME ()

Abstract
Ceramides (Cer) are mediators of inflammatory processes. In a chronic experimental autoimmune encephalomyelitis (EAE) model of multiple sclerosis (MS), we observed a significant elevation of C16-Cer and its synthesizing enzyme, ceramide synthase(CerS)6, in the lumbar spinal cord. In the present study, we have confirmed that C16-Cer and CerS6 are also upregulated in the lumbar spinal cord in a spontaneous relapse-remitting EAE model, using SJL mice overexpressing a transgenic T cell receptor (TCR1640). CerS6 was found to be expressed in macrophages, T cells and B cells in EAE lesions. In macrophages, we demonstrated that interferon gamma (IFN-γ)-induced CerS6 upregulation was amplified by 17ß-estradiol, an action that was further accompanied by increased upregulation of tumor necrosis factor alpha (TNF-α). Accordingly, CerS6 and TNF-α expression was upregulated predominantly in the spinal cord in female TCR1640 mice, which usually develop the relapse-remitting form of EAE, while male TCR1640 mice showed an attenuated regulation of CerS6 and TNF-α and exhibit mostly chronic disease progression. Furthermore, expression of TNFR2, one of two receptors of TNF-α, which is linked to neuroprotection and remyelination, was also upregulated to a greater extent during EAE in female TCR1640 mice in comparison to male TCR1640 mice. Taken together, our results confirm the upregulation of CerS6 and C16-Cer in an adjuvant-independent, physiological EAE model and further suggest an anti-inflammatory role of CerS6 in the regulation of the disease course in female TCR1640 mice via TNF-α/TNFR2.

: http://publica.fraunhofer.de/documents/N-356274.html