Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Alder Hey Children's NHS Foundation Trust Hospital, Eaton Road, Liverpool L12 2AP, UK; Department of Biology, College of Science in Zulfi, Majmaah University, Majmaah 11952, Saudi Arabia.
Centre for Inflammation Research, Queen's Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK; Child Life and Health, The University of Edinburgh, 20 Sylvan Place, Edinburgh EH9 1UW, UK.
Cytokine. 2018 Oct;110:267-271. doi: 10.1016/j.cyto.2018.01.014. Epub 2018 Feb 1.
Innate immune responses are known to influence the subsequent development of adaptive immunity. We have previously shown that RSV infection of human airway epithelial cells results in production of the B cell growth factor, BAFF. To better understand how the airway responds to RSV infection by production of this and other factors to support or enhance local B cell responses to infection, we analysed the lung expression of BAFF and B cell homeostatic chemokines CXCL12, CXCL13, CCL19 and CCL21 in a murine model of RSV infection. Following infection with A2 strain RSV, the highest RSV N gene expression was observed at day 4 after challenge with virus. In contrast, two peaks of elevated BAFF expression at days 2 and 7 were observed. CXCL13 was significantly elevated at days 1, 2 and 7. CXCL12, CCL19 and CCL21 were expressed within lung tissue from control and RSV challenged animals but no significant difference in expression was found. Immunofluorescence showed BAFF to be present throughout the tissue however CXCL13 expression was localized to cell rich areas probably constituting lymphoid aggregates. Our results define the kinetics of B cell chemoattractant and growth factor expression during RSV infection and indicate an important role for these cytokines in the airway response to RSV infection.
先天免疫反应被认为会影响适应性免疫的后续发展。我们之前已经表明,RSV 感染人气道上皮细胞会导致 B 细胞生长因子 BAFF 的产生。为了更好地了解气道如何通过产生这种和其他因子来应对 RSV 感染,以支持或增强局部 B 细胞对感染的反应,我们分析了在 RSV 感染的小鼠模型中 BAFF 和 B 细胞稳态趋化因子 CXCL12、CXCL13、CCL19 和 CCL21 在肺部的表达。在感染 A2 株 RSV 后,在病毒攻击后第 4 天观察到 RSV N 基因表达最高。相比之下,在第 2 天和第 7 天观察到 BAFF 表达的两个高峰。在第 1、2 和 7 天 CXCL13 显著升高。在对照和 RSV 攻击动物的肺组织中表达 CXCL12、CCL19 和 CCL21,但表达无显著差异。免疫荧光显示 BAFF 存在于整个组织中,但 CXCL13 的表达局限于富含细胞的区域,可能构成淋巴聚集。我们的研究结果定义了 RSV 感染期间 B 细胞趋化因子和生长因子表达的动力学,并表明这些细胞因子在气道对 RSV 感染的反应中起着重要作用。