首页> 外文期刊>Clinical immunology: The official journal of the Clinical Immunology Society >IL-1 beta stimulates divergent upper and lower airway epithelial cell CCL5 secretion.
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IL-1 beta stimulates divergent upper and lower airway epithelial cell CCL5 secretion.

机译:IL-1β刺激上呼吸道和下呼吸道上皮细胞CCL5的分泌不同。

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Direct infection of respiratory epithelium induces chemokine secretion and upregulates cytokine networks, which are central in regulating inflammation. IL-1beta may have a pivotal role in such networks. Differential control of chemokine secretion within specific airway regions, which have distinct roles in immunity, is not well characterized. We investigated IL-1beta-induced CXCL8 and CCL5 secretion from primary normal human bronchial and small airway epithelial cells, and the alveolar cell line A549. CXCL8 was secreted by all cells, but only lower airway cells secreted CCL5. IL-1beta induced nuclear translocation of NF-kappaB (p50, p65 and c-Rel subunits), NF-IL-6 and AP-1, each with distinct kinetics. This was associated with high level CCL5 promoter activation, via transcription factor binding to multiple regions, including NF-kappaB, AP-1 and NF-IL-6 sites. The IL-1-related cytokine IL-18 did not drive or modulate IL-1beta-induced CXCL8 or CCL5 secretion. In summary, IL-1beta, but not IL-18, induces transcription-dependent lower airway epithelial cell-specific CCL5 secretion. Differential chemokine secretion may have profound effects on local leukocyte influx within upper or lower airways exposed to airway infection or environmental stimuli, which might then require different anti-inflammatory strategies.
机译:呼吸道上皮的直接感染诱导趋化因子分泌并上调细胞因子网络,这是调节炎症的关键。 IL-1beta在此类网络中可能起关键作用。特异性气道区域内趋化因子分泌的差异控制在免疫中具有不同的作用,目前尚无很好的特征。我们调查了IL-1beta诱导的正常人支气管和小气道上皮细胞以及肺泡细胞系A549分泌CXCL8和CCL5。 CXCL8被所有细胞分泌,但只有下呼吸道细胞分泌CCL5。 IL-1β诱导了NF-kappaB(p50,p65和c-Rel亚基),NF-IL-6和AP-1的核易位,每个都有不同的动力学。这与转录因子结合到多个区域(包括NF-κB,AP-1和NF-IL-6位点)的高水平CCL5启动子激活有关。 IL-1相关的细胞因子IL-18不会驱动或调节IL-1beta诱导的CXCL8或CCL5分泌。总之,IL-1beta而非IL-18诱导转录依赖性下呼吸道上皮细胞特异性CCL5分泌。趋化因子的不同分泌可能对暴露于气道感染或环境刺激的上呼吸道或下呼吸道内的局部白细胞流入产生深远影响,因此可能需要不同的抗炎策略。

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