کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10767270 | 1050718 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transbilayer movement of ceramide in the plasma membrane of live cells
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کلمات کلیدی
CERKSPHGFPC1PTLCFB1MβCDS1PPBSCCCPsphingosine 1-phosphate - اسپینگزین 1-فسفاتsphingosine - اسپینگوزینsphingolipid - اسپینگولایپیدbpm - بوقلمونCer - سرceramide - سرامیدCeramide 1-phosphate - سرامید 1-فسفاتCeramide kinase - سرامید کینازPhosphate buffered saline - فسفات بافر شورFumonisin B1 - فومونیزین B1methyl β-cyclodextrin - متیل β-سیکلوکودکسترینgreen fluorescent protein - پروتئین فلورسنت سبزthin-layer chromatography - کروماتوگرافی نازک لایه
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Ceramide (Cer) is the precursor for sphingolipids and functions as a second messenger in a variety of cellular processes including apoptosis. However, no direct target of Cer leading to apoptosis has been identified. Understanding the movement and trafficking of Cer is important for fully understanding Cer signaling. In this study, we identified, for the first time, the transbilayer movement of Cer in the plasma membrane (PM) of living cells. We developed a new method to monitor transbilayer Cer movement using ceramide kinase activity. To produce Cer on the extracellular leaflet of the PM, bacterial sphingomyelinase (SMase) was added to rat basophilic leukemia cells. Interestingly, the dramatic elevation of ceramide 1-phosphate (C1P), the product of CerK, was observed following the increase of Cer induced by SMase treatment. Since we determined that both the protein and catalytic activity of CerK exists in the intracellular compartment, the all conversion of Cer to C1P by CerK should be occur intracellularly. This result indicates the rapid transbilayer movement of Cer from the outer leaflet to the inner leaflet of the PM of living cells. Furthermore, protease digestion of membrane proteins, inhibition of ABC transporters (by glibencramide) and of cation channels (by carbonyl cyanide m-chlorophenylhydrozone), and modification of cholesterol content did not affect the transbilayer movement of Cer. Thus, this movement might occur spontaneously. Our findings indicate not only Cer movement in the PM, but also identify an intrinsic property of Cer enabling Cer signaling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 359, Issue 3, 3 August 2007, Pages 622-627
Journal: Biochemical and Biophysical Research Communications - Volume 359, Issue 3, 3 August 2007, Pages 622-627
نویسندگان
Susumu Mitsutake, Yasuyuki Igarashi,