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The GH3 cell line, a bipotential cell line secreting both prolactin (PRL) and growth hormone (GH), is a useful model for investigating GH/PRL cell lineage differentiation and anterior pituitary adenoma formation. In this study, we investigated the ganglioside composition of GH3 cells and identified two fucogangliosides as the major gangliosides expressed by these cells. Analyses by DEAE-Sephadex A-25 and thin-layer chromatography (TLC) revealed that the GH3 cells contained two major gangliosides, designated FG1 and FG2, respectively. Their structures were identified by fast atom bombardment mass spectrometry and proton nuclear magnetic resonance spectrometry: FG1 is IV2FUc alpha,II3NeuAc-GgOse4Cer and FG2 is IV2FUc alpha,IV3Gal alpha,II3NeuAc-GgOse4Cer. Expression of these fucogangliosides was enhanced by chronic treatment with 17 beta-estradiol (1 nM), epidermal growth factor (10 nM) and insulin (300 nM), which induced differentiation of GH3 cells to normal PRL-secreting cells. Interestingly, immunocytochemistry and flow cytometry revealed that the increased expression of these gangliosides reflected a quantitative change inside the cells but not on the cell surface. These results suggest that the intracellular distribution of fucogangliosides is closely related to the differentiation of GH3 cells.
Pubmed ID: 9540820 RIS Download
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An award-winning multimedia science and environment series created by KQED, San Francisco, the public media station serving Northern California. Launched in February 2007, by the end of its fourth season (in September 2010), QUEST had reached approximately 36 million viewers and listeners through its traditional TV and radio broadcasts and its growing Web audience. QUEST''s ultimate aim is to raise science literacy in the San Francisco Bay Area and beyond, inspiring audiences to discover and explore science and environment issues for themselves. Every season, KQED''s QUEST produces: * half-hour television episodes episodes that air weekly, exploring the cutting-edge work of Northern California scientists and researchers (QUEST airs Wednesdays 7:30pm on KQED Public Television 9); * weekly radio reports covering urban environmental issues which often include multimedia slide shows, and interactive online maps (QUEST airs Mondays 6:30am and 8:30am on KQED Public Radio 88.5 FM); * Educational resources, for use by formal and informal educators; QUEST also provides professional development for science educators to support multimedia and technology integration in science classrooms and programs; * 20 six-minute stories for its new web only series, Science on the SPOT, which takes a fresh, fast and curious look at science with stories about albino redwoods, the science of fog and banana slugs, to name a few. (launched in 2010); * A daily science blog written by Northern California scientists, QUEST producers and science enthusiasts; * Exclusive web extras, featuring extended interviews with scientists; Flickr photos, and science hikes. Formal and informal Educators who would like to become involved withthe educational outreach program should contact: ScienceEd (at) kqed.org.
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