Centre for Immunobiology, School of Infection and Immunity, University of Glasgow, UK.
Cancer Research UK Scotland Institute, Glasgow, UK.
Mucosal Immunol. 2024 Oct;17(5):843-857. doi: 10.1016/j.mucimm.2024.06.001. Epub 2024 Jun 6.
Influenza A virus (IAV) infection leads to the formation of mucosal memory CD4 T cells that can protect the host. An in-depth understanding of the signals that shape memory cell development is required for more effective vaccine design. We have examined the formation of memory CD4 T cells in the lung following IAV infection of mice, characterizing changes to the lung landscape and immune cell composition. IAV-specific CD4 T cells were found throughout the lung at both primary and memory time points. These cells were found near lung airways and in close contact with a range of immune cells including macrophages, dendritic cells, and B cells. Interactions between lung IAV-specific CD4 T cells and major histocompatibility complex (MHC)II+ cells during the primary immune response were important in shaping the subsequent memory pool. Treatment with an anti-MHCII blocking antibody increased the proportion of memory CD4 T cells found in lung airways but reduced interferon-γ expression by IAV-specific immunodominant memory CD4 T cells. The immunodominant CD4 T cells expressed higher levels of programmed death ligand 1 (PD1) than other IAV-specific CD4 T cells and PD1+ memory CD4 T cells were located further away from MHCII+ cells than their PD1-low counterparts. This distinction in location was lost in mice treated with anti-MHCII antibodies. These data suggest that sustained antigen presentation in the lung impacts the formation of memory CD4 T cells by regulating their cytokine production and location.
甲型流感病毒(IAV)感染会导致黏膜记忆 CD4 T 细胞的形成,从而保护宿主。为了更有效地设计疫苗,需要深入了解塑造记忆细胞发育的信号。我们研究了 IAV 感染小鼠后肺部记忆 CD4 T 细胞的形成,描述了肺部景观和免疫细胞组成的变化。在原发性和记忆性时间点,均可在肺部的各个部位发现 IAV 特异性 CD4 T 细胞。这些细胞位于肺气道附近,并与包括巨噬细胞、树突状细胞和 B 细胞在内的一系列免疫细胞密切接触。在原发性免疫反应中,肺内 IAV 特异性 CD4 T 细胞与主要组织相容性复合体(MHC)II+细胞之间的相互作用对于塑造随后的记忆池非常重要。用抗 MHCII 阻断抗体治疗可增加肺气道中发现的记忆 CD4 T 细胞的比例,但会降低 IAV 特异性免疫显性记忆 CD4 T 细胞中的干扰素-γ表达。与其他 IAV 特异性 CD4 T 细胞相比,免疫显性 CD4 T 细胞表达更高水平的程序性死亡配体 1(PD1),并且 PD1+记忆 CD4 T 细胞的位置比 PD1-低的细胞更远离 MHCII+细胞。在用抗 MHCII 抗体治疗的小鼠中,这种位置上的区别消失了。这些数据表明,肺部持续的抗原呈递通过调节其细胞因子产生和位置影响记忆 CD4 T 细胞的形成。
Immunol Cell Biol. 2019-6-5
Am J Physiol Heart Circ Physiol. 2024-10-1
Methods Mol Biol. 2017
Immunol Cell Biol. 2014-8
Annu Rev Immunol. 2023-4-26
Int J Biochem Cell Biol. 2022-12