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首页> 外文期刊>Journal of Leukocyte Biology: An Official Publication of the Reticuloendothelial Society >Human eosinophils express and release IL-13 following CD28-dependent activation.
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Human eosinophils express and release IL-13 following CD28-dependent activation.

机译:CD28依赖性激活后,人类嗜酸性粒细胞表达并释放IL-13。

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摘要

Human eosinophils produce a large number of cytokines, including immunoregulatory cytokines. Given that eosinophils store and release interleukin (IL)-4, a key cytokine in the pathogenesis of allergic inflammation, and that IL-4 and IL-13 share common biological functions, we investigated the possibility that IL-13 may be synthesized by these cells. Using flow cytometry and immunocytochemistry, we show that eosinophils synthesize and store IL-13. Granule localization was demonstrated after subcellular fractionation, and IL-13 immunoreactivity was localized to crystalloid, granule-enriched fractions. Furthermore, electron microscopic analyses specifically localized IL-13 to the dense cores of bicompartmental secondary granules. Upon CD28 ligation, IL-13 was released by eosinophils, whereas a combination of CD28 and immunoglobulin A complexes resulted in decreased IL-13 secretion. Furthermore, eosinophil-derived IL-13 exerts a biological effect, inducing CD23 expression on B cells. By having the capacity to synthesize and release IL-13, eosinophils may participate in the development and maintenance of the T helper cell type 2 response, a prominent feature of allergic diseases.
机译:人嗜酸性粒细胞产生大量细胞因子,包括免疫调节细胞因子。鉴于嗜酸性粒细胞可存储和释放变应性炎症发病机理中的关键细胞因子白细胞介素(IL)-4,并且IL-4和IL-13具有共同的生物学功能,因此我们研究了这些可能合成IL-13的可能性。细胞。使用流式细胞仪和免疫细胞化学,我们显示嗜酸性粒细胞合成并存储IL-13。在亚细胞分级分离后证实了颗粒定位,并且IL-13免疫反应性定位于晶体,富含颗粒的级分。此外,电子显微镜分析将IL-13特异地定位在双室次级颗粒的密集核上。 CD28连接后,嗜酸性粒细胞释放IL-13,而CD28和免疫球蛋白A复合物的组合导致IL-13分泌减少。此外,嗜酸性粒细胞来源的IL-13发挥生物学作用,诱导B细胞上CD23表达。通过具有合成和释放IL-13的能力,嗜酸性粒细胞可以参与2型T辅助细胞应答的发展和维持,这是过敏性疾病的一个突出特征。

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