Ly6G 缺陷改变了大孢霉皮肤感染过程中中性粒细胞募集和病原体捕获的动力学。
Ly6G deficiency alters the dynamics of neutrophil recruitment and pathogen capture during Leishmania major skin infection.
机构信息
Institute of Molecular and Clinical Immunology, Health Campus Immunology Infectiology and Inflammation (GC-I3), Otto-Von-Guericke-University, Leipziger Strasse 44, 39120, Magdeburg, Germany.
Department of Immunology, Dynamics of Immune Responses, Institut Pasteur, 25 Rue du Docteur Roux, 75015, Paris, France.
出版信息
Sci Rep. 2021 Jul 23;11(1):15071. doi: 10.1038/s41598-021-94425-9.
Neutrophils represent one of the first immune cell types recruited to sites of infection, where they can control pathogens by phagocytosis and cytotoxic mechanisms. Intracellular pathogens such as Leishmania major can hijack neutrophils to establish an efficient infection. However the dynamic interactions of neutrophils with the pathogen and other cells at the site of the infection are incompletely understood. Here, we have investigated the role of Ly6G, a homolog of the human CD177 protein, which has been shown to interact with cell adhesion molecules, and serves as a bona fide marker for neutrophils in mice. We show that Ly6G deficiency decreases the initial infection rate of neutrophils recruited to the site of infection. Although the uptake of L. major by subsequently recruited monocytes was tightly linked with the concomitant uptake of neutrophil material, this process was not altered by Ly6G deficiency of the neutrophils. Instead, we observed by intravital 2-photon microscopy that Ly6G-deficient neutrophils entered the site of infection with delayed initial recruitment kinetics. Thus, we conclude that by promoting neutrophils' ability to efficiently enter the site of infection, Ly6G contributes to the early engagement of intracellular pathogens by the immune system.
中性粒细胞是最早被招募到感染部位的免疫细胞之一,它们可以通过吞噬作用和细胞毒性机制来控制病原体。像利什曼原虫这样的细胞内病原体可以劫持中性粒细胞来建立有效的感染。然而,中性粒细胞与病原体以及感染部位的其他细胞之间的动态相互作用还不完全清楚。在这里,我们研究了 Ly6G 的作用,Ly6G 是人类 CD177 蛋白的同源物,已被证明与细胞粘附分子相互作用,并作为小鼠中性粒细胞的真实标志物。我们发现 Ly6G 缺乏会降低被招募到感染部位的中性粒细胞的初始感染率。尽管随后被招募的单核细胞对 L. major 的摄取与中性粒细胞物质的摄取密切相关,但 Ly6G 缺乏对中性粒细胞的摄取没有影响。相反,我们通过活体双光子显微镜观察到,Ly6G 缺陷型中性粒细胞进入感染部位的初始招募动力学延迟。因此,我们得出结论,通过促进中性粒细胞有效进入感染部位的能力,Ly6G 有助于免疫系统早期与细胞内病原体结合。