Molecular cloning and characterization of galactosylceramide expression factor-1 (GEF-1)
In: Neurochemical research, Jg. 27 (2002-10-11), Heft 7-8
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Zugriff:
A rat brain cDNA clone has been isolated using a eukaryotic cell transient expression system with anti-galactosylceramide (GalCer) monoclonal antibody (MAb), that induces GalCer expression in COS-7 cells. The protein was designated as GalCer expression factor-1 (GEF-1). The deduced amino acid sequences revealed a strikingly high homology to a mouse hepatocyte growth factor-regulated tyrosine kinase substrate (Hrs), but no homology to UDP-galactose: ceramide galactosyltransferase. COS-7 cells transfected with the cDNA clone showed dramatic morphological changes and cell growth suppression. Overexpression of GEF-1 in MDCK (MDCK/GEF-1) cells showed GalCer-derived sulfatide expression as well as morphological changes, but not cell growth suppression. The enzyme activity and the mRNA level of CGT increased significantly in MDCK/GEF-1 cells compared with control cells. Taking these results together, it is suggested that GEF-1 may play an important role in regulating GalCer and sulfatide expression in the epithelial cells as well as in the brain.
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Molecular cloning and characterization of galactosylceramide expression factor-1 (GEF-1)
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Autor/in / Beteiligte Person: | Kiyoshi, Ogura ; Tadashi, Tai |
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Zeitschrift: | Neurochemical research, Jg. 27 (2002-10-11), Heft 7-8 |
Veröffentlichung: | 2002 |
Medientyp: | unknown |
ISSN: | 0364-3190 (print) |
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