首页> 外文期刊>American Journal of Physiology >Dynamics of nuclear localization sites for COX-2 in vascular endothelial cells.
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Dynamics of nuclear localization sites for COX-2 in vascular endothelial cells.

机译:血管内皮细胞中COX-2核​​定位位点的动态。

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摘要

We investigated the relationships among expression, activity, and spatial organization of cyclooxygenase (COX-1 and COX-2) in endothelial cells from porcine and human cerebral microvessels and from human umbilical vein. In quiescent cells, COX-1 was detected in the perinuclear zone and the cytoplasm, while COX-2 was mainly a nuclear resident possibly connected with the nuclear matrix. COX-2 immunogold labeling was situated in the nuclear envelope, at the nuclear pores, and in connection with the perichromatin regions of the nucleus, considered to be the sites of active transcription. In human endothelial cells transcriptionally activated by interleukin (IL)-1beta, the nucleus remained a major COX-2 localization site during the first 12 h of stimulation, when COX-2 expression was maximally induced. The continuous rise in prostanoid synthesis at 17-23 h of stimulation was associated with COX-2 relocation from the nucleus to the nuclear envelope and the cytoplasm. IL-1beta did not affect COX-1 expression,activity, and localization. COX-2 nuclear localization sites and trafficking between the nucleus and the cytoplasm in endothelial cells may indicate a novel function of COX-2 in regulating gene expression.
机译:我们调查了猪,人脑微血管和人脐静脉内皮细胞中环氧合酶(COX-1和COX-2)的表达,活性和空间组织之间的关系。在静止细胞中,在核周区和细胞质中检测到COX-1,而COX-2主要是可能与核基质相连的核常驻分子。 COX-2免疫金标记位于核被膜中,核孔处,并与被认为是活性转录位点的核周染色质区域有关。在被白介素(IL)-1β转录激活的人内皮细胞中,当最大程度地诱导COX-2表达时,在刺激的最初12小时内,细胞核仍是主要的COX-2定位位点。刺激后17-23 h前列腺素合成的持续增加与COX-2从细胞核到核膜和细胞质的迁移有关。 IL-1beta不会影响COX-1的表达,活性和定位。内皮细胞中COX-2的核定位位点和在核与细胞质之间的运输可能表明COX-2在调节基因表达中具有新功能。

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