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首页> 外文期刊>Clinical and experimental pharmacology & physiology >In situ generation of nitric oxide by myenteric neurons but not by mononuclear cells of the human colon.
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In situ generation of nitric oxide by myenteric neurons but not by mononuclear cells of the human colon.

机译:肌层神经元原位生成一氧化氮,但人结肠单核细胞未生成。

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1. Production of nitric oxide (NO) is implicated in the pathogenesis of inflammatory bowel disease. However, the cells responsible for the production of NO in situ in the human colon remain unknown. 2. Surgical samples from 12 patients with ulcerative colitis, eight patients with Crohn's disease and 10 controls were studied. Possible generation of NO was visualized by reduced nicotinamide adenine dinucleotide phosphate (NADPH) diaphorase activity in human colon. Immunohistological staining for various NO synthase (NOS) isoforms (endothelial, neuronal and inducible), nitrotyrosine and interleukin-2 was also performed. 3. Reduced NADPH diaphorase activity was not found in lamina propria mononuclear cells, but was found in colonic epithelium, endothelium and myenteric neurons and their processes. 4. The NADPH-diaphorase activity positive processes were significantly less common in colon from patients with Crohn's disease compared with control colon. 5. Endothelial NOS was constitutively expressed on colonic endothelium. 6. Neuronal NOS was constitutively expressed on myenteric neurons. 7. Expression of inducible NOS (iNOS) was increased in the epithelium and endothelium of the colon of patients with ulcerative colitis. 8. No correlation was found between expression of iNOS and NADPH diaphorase activity. 9. Nitrotyrosine was expressed by lamina propria leucocytes, but not by epithelium. 10. Interleukin-2 was expressed on both leucocytes and myenteric neurons. 11. Colonic epithelium, endothelium and myenteric neurons synthesize NO. Myenteric neurons were principally responsible for NO production and NO may act as a neurotransmitter in the enteric nervous system.
机译:一氧化氮(NO)的产生与炎症性肠病的发病机理有关。然而,负责在人结肠中原位产生NO的细胞仍然未知。 2.研究了来自12例溃疡性结肠炎,8例克罗恩病和10例对照的手术样本。通过降低人类结肠中烟酰胺腺嘌呤二核苷酸磷酸(NADPH)心肌黄递酶活性,可以观察到可能的NO生成。还对各种NO合酶(NOS)亚型(内皮,神经元和诱导型),硝基酪氨酸和白介素2进行了免疫组织学染色。 3.在固有层固有核细胞中未发现NADPH心肌黄递酶活性降低,但在结肠上皮,内皮和肌层神经元及其过程中发现了NADPH心肌黄递酶活性降低。 4.与对照结肠相比,克罗恩病患者结肠中NADPH-心肌黄递酶活性阳性过程明显较少。 5.在结肠内皮上组成性表达内皮NOS。 6.神经元NOS在肌层神经元上组成性表达。 7.溃疡性结肠炎患者结肠上皮和内皮中诱导型NOS(iNOS)的表达增加。 8. iNOS的表达与NADPH心肌黄递酶活性之间没有相关性。 9.硝基酪氨酸由固有层白细胞表达,但不由上皮表达。 10.白细胞介素2在白细胞和肌层神经元上均表达。 11.结肠上皮,内皮和肌层神经元合成NO。肠神经元主要负责NO的产生,NO可能在肠神经系统中充当神经递质。

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