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Sphingosine kinase 1 regulates mucin production via ERK phosphorylation
Authors:Yuko Kono  Teruaki Nishiuma  Taro Okada  Kazuyuki Kobayashi  Yasuhiro Funada  Yoshikazu Kotani  Saleem Jahangeer  Shun-ichi Nakamura  Yoshihiro Nishimura
Institution:1. Department of Laboratory Medicine, School of Tropical Medicine, 108 C. R. Avenue, Kolkata 700073, West Bengal, India;2. Department of Clinical & Experimental Pharmacology, School of Tropical Medicine, 108 C. R. Avenue, Kolkata 700073, West Bengal, India;3. Department of Biochemistry & Medical Biotechnology, School of Tropical Medicine, 108 C. R. Avenue, Kolkata 700073, West Bengal, India
Abstract:Our previous report showed that inhibition of sphingosine kinase (SphK) ameliorates eosinophilic inflammation and mucin production in a mouse asthmatic model. To clarify the role of SphK in airway mucin production, we utilized the mouse asthmatic model and found that both SphK and MUC5AC expression were increased and co-localized in airway epithelium. Next we cultured normal human bronchial epithelial cells in an air–liquid interface and treated with IL-13 to induce their differentiation into goblet cells. We found that SphK1 and MUC5AC expression was increased by IL-13 treatment at both protein and mRNA levels, whereas SphK2 expression was not changed. N,N-dimethylsphingosine (DMS), a potent SphK inhibitor, decreased MUC5AC expression up-regulated by IL-13 treatment. Furthermore, DMS inhibited IL-13-induced ERK1/2 phosphorylation but neither p38 MAPK nor STAT6 phosphorylation. These results suggest that SphK1 is involved in MUC5AC production induced by IL-13 upstream of ERK1/2 phosphorylation, and independent of STAT6 phosphorylation.
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