کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4341273 | 1295829 | 2006 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Subcellular localization of nicotinamide adenine dinucleotide phosphate oxidase subunits in neurons and astroglia of the rat medial nucleus tractus solitarius: Relationship with tyrosine hydroxylase immunoreactive neurons
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کلمات کلیدی
PBSNTSANGIIREReNOSNADPHmNTSIgGBSA - BSAROS - ROSbovine serum albumin - آلبومین سرم گاوAngiotensin II - آنژیوتانسین دوimmunoglobulin G - ایمونوگلوبولین Gphosphate buffer - بافر فسفاتTris-buffered saline - تریس بافر شورtyrosine hydroxylase - تیروزین هیدروکسیلازAutonomic nervous system - دستگاه عصبی خودمختار یا خودگردان یا اتونومendothelial nitric oxide synthase - سنتاز اکسید نیتریک اندوتلیالSuperoxide - سوپر اکسیدPhox - فاکسphagocyte oxidase - فاگوسیت اکسیدازBlood pressure - فشارخونGolgi complex - مجموعه گلژیPhosphate-buffered saline - محلول نمک فسفات با خاصیت بافریNitric oxide - نیتریک اکسیدnicotinamide adenine dinucleotide phosphate - نیکوتین آمید adenine dinucleotide phosphatenucleus of the solitary tract - هسته دستگاه انفرادیcatecholamines - کاتکول امینReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
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چکیده انگلیسی
Superoxide produced by the enzyme nicotinamide adenine dinucleotide phosphate (NADPH) oxidase mediates crucial intracellular signaling cascades in the medial nucleus of the solitary tract (mNTS), a brain region populated by catecholaminergic neurons, as well as astroglia that play an important role in autonomic function. The mechanisms mediating NADPH oxidase (phagocyte oxidase) activity in the neural regulation of cardiovascular processes are incompletely understood, however the subcellular localization of superoxide produced by the enzyme is likely to be an important regulatory factor. We used immunogold electron microscopy to determine the phenotypic and subcellular localization of the NADPH oxidase subunits p47phox, gp91phox, and p22phox in the mNTS in rats. The mNTS contains a large population of neurons that synthesize catecholamines. Significantly, catecholaminergic signaling can be modulated by redox reactions. Therefore, the relationship of NADPH oxidase subunit labeled neurons or glia with respect to catecholaminergic neurons was also determined by dual labeling for the superoxide producing enzyme and tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamine biosynthesis. In the mNTS, NADPH oxidase subunits were present primarily in somatodendritic processes and astrocytes, some of which also contained TH, or were contacted by TH-labeled axons, respectively. Immunogold quantification of NADPH oxidase subunit localization showed that p47phox and gp91phox were present on the surface membrane, as well as vesicular organelles characteristic of calcium storing smooth endoplasmic reticula in dendritic and astroglial processes. These results indicate that NADPH oxidase assembly and consequent superoxide formation are likely to occur near the plasmalemma, as well as on vesicular organelles associated with intracellular calcium storage within mNTS neurons and glia. Thus, NADPH oxidase-derived superoxide may participate in intracellular signaling pathways linked to calcium regulation in diverse mNTS cell types. Moreover, NADPH oxidase-derived superoxide in neurons and glia may directly or indirectly modulate catecholaminergic neuron activity in the mNTS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 143, Issue 2, 1 December 2006, Pages 547-564
Journal: Neuroscience - Volume 143, Issue 2, 1 December 2006, Pages 547-564
نویسندگان
M.J. Glass, J. Huang, M. Oselkin, M.J. Tarsitano, G. Wang, C. Iadecola, V.M. Pickel,