کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4339652 | 1295763 | 2010 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inwardly rectifying potassium channel Kir4.1 is responsible for the native inward potassium conductance of satellite glial cells in sensory ganglia
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کلمات کلیدی
RMPKCNJ10phorbol 12-myristate 13-acetateSGCKirPKCsiRNAsGLASTRT-PCRPBSHEPESeGFPEGTA4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid - 4- (2-hydroxyethyl) -1-piperazineethanesulfonic acidI–V - I - VPMA - LDC هاsmall interfering RNAs - RNA های تداخل کوچکethylene glycol tetraacetic acid - اتیلن گلیکول تتراستیک اسیدPotassium buffering - بافر پتاسیمcurrent–voltage - جریان ولتاژGlutamate-aspartate transporter - حمل و نقل گلوتامات-آسپارتاتinwardly rectifying potassium - داخل پتاسیم اصلاح شده استPain - دردCNS - دستگاه عصبی مرکزیSatellite glial cell - سلول گلیال ماهواره ایcentral nervous system - سیستم عصبی مرکزیphosphate buffered solution - محلول بافر فسفاتreverse transcriptase polymerase chain reaction - واکنش زنجیره ای پلی مراز ترانس کریتاز معکوسpolymerase chain reaction - واکنش زنجیره ای پلیمرازPCR - واکنش زنجیرهٔ پلیمرازresting membrane potential - پتانسیل غشای استراحتenhanced green fluorescent protein - پروتئین فلورسنت سبز افزایش یافته استProtein kinase C - پروتئین کیناز سیPotassium channel - کانال پتاسیمdorsal root ganglia - گانگلیس ریشه پشتیtrigeminal ganglia - گانگلیس سه گانهGlutamine synthetase - گلوتامین سنتتاز
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Satellite glial cells (SGCs) surround primary afferent neurons in sensory ganglia, and increasing evidence has implicated the K+ channels of SGCs in affecting or regulating sensory ganglion excitability. The inwardly rectifying K+ (Kir) channel Kir4.1 is highly expressed in several types of glial cells in the central nervous system (CNS) where it has been implicated in extracellular K+ concentration buffering. Upon neuronal activity, the extracellular K+ concentration increases, and if not corrected, causes neuronal depolarization and uncontrolled changes in neuronal excitability. Recently, it has been demonstrated that knockdown of Kir4.1 expression in trigeminal ganglia leads to neuronal hyperexcitability in this ganglia and heightened nociception. Thus, we investigated the contribution of Kir4.1 to the membrane K+ conductance of SGCs in neonatal and adult mouse trigeminal and dorsal root ganglia. Whole cell patch clamp recordings were performed in conjunction with immunocytochemistry and quantitative transcript analysis in various mouse lines. We found that in wild-type mice, the inward K+ conductance of SGCs is blocked almost completely with extracellular barium, cesium and desipramine, consistent with a conductance mediated by Kir channels. We then utilized mouse lines in which genetic ablation led to partial or complete loss of Kir4.1 expression to assess the role of this channel subunit in SGCs. The inward K+ currents of SGCs in Kir4.1+/â mice were decreased by about half while these currents were almost completely absent in Kir4.1â/â mice. These findings in combination with previous reports support the notion that Kir4.1 is the principal Kir channel type in SGCs. Therefore Kir4.1 emerges as a key regulator of SGC function and possibly neuronal excitability in sensory ganglia.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 166, Issue 2, 17 March 2010, Pages 397-407
Journal: Neuroscience - Volume 166, Issue 2, 17 March 2010, Pages 397-407
نویسندگان
X. Tang, T.M. Schmidt, C.E. Perez-Leighton, P. Kofuji,