PT-杂志文章Au -Haver,K au -Gerard,C Au -Kobzik,L au -shore,sa ti-新生儿和成人兔Tracheas DP中的中性内肽酶活性 - 1997年8月1日 - 欧洲呼吸杂志 - 1844--1844---1844----1844---1849 VI -10 IP -8 4099 -http://www.qdcxjkg.com/content/10/8/1844.444.short 4100- http://www.qdcxjkg.com/content.com/content/content/10/8/1844.full-UR呼吸J1997 8月1日;10 AB - 中性内肽酶(NEP,E.C。3.4.24.11),一种广泛分布的外染料酶,切割并灭活多种生物活性肽,包括速素,物质P(SP)。进行这项研究是为了确定NEP对SP气道平滑肌收缩的调节是否依赖于年龄。我们研究了新生儿和120天大的新西兰白兔子的孤立气管环的收缩反应。我们测量了NEP活性并确定气管膜制剂中的免疫反应性NEP含量。然后将NEP活性在组织化学上定位在兔气管的切片中。在NEP抑制剂(SCH 32615)的存在下,新生儿和120天大的兔子在新生儿和120天的兔子中增加了隔离气管环对SP的收缩反应。但是,新生动物的增长最大。气管膜制剂中的NEP活性增加了新生儿和120天大的兔子之间的五倍。 Western blot analysis also revealed a significant increase in the immunoreactive NEP content of these tracheal membrane preparations between the newborn and 120 day old rabbits. NEP activity, localized histochemically, was most intense in the epithelial region of the newborn animals, with a shift of activity to the subepithelial region with age. The prominent epithelial localization of neutral endopeptidase in the tracheas of these 1 day old rabbits, which we have shown to have relatively low neutral endopeptidase activity, suggests that the location of neutral endopeptidase in the airway, including proximity to relevant substance P receptors, may be critical to its function.