Recruitment of dendritic cell progenitors to foci of influenza A virus infection sustains immunity
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Mar Cabeza Cabrerizo Carlos Munoz Minutti Mariana Pereira da Costa Ana Matos Cardoso Da Silva Rob Jenkins Justina Kulikauskaite Michael Buck Cecile Piot Neil Rogers Stefania Crotta Lynne Whittaker Hector Huerga Encabo John Mccauley Judith E Allen Manolis Pasparakis Andreas Wack Erik Sahai Caetano Reis e SousaAbstract
Protection from infection with respiratory viruses such as influenza A virus (IAV) requires T cell–mediated immune responses initiated by conventional dendritic cells (cDCs) that reside in the respiratory tract. Here, we show that effective induction of T cell responses against IAV in mice requires reinforcement of the resident lung cDC network by cDC progenitors. We found that CCR2-binding chemokines produced during IAV infection recruit pre-cDCs from blood and direct them to foci of infection, increasing the number of progeny cDCs next to sites of viral replication. Ablation of CCR2 in the cDC lineage prevented this increase and resulted in a deficit in IAV-specific T cell responses and diminished resistance to reinfection. These data suggest that the homeostatic network of cDCs in tissues is insufficient for immunity and reveal a chemokine-driven mechanism of expansion of lung cDC numbers that amplifies T cell responses against respiratory viruses.
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Journal Science Immunology
Volume 6
Issue number 65
Pages eabi9331
Available online
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Publisher website (DOI) 10.1126/sciimmunol.abi9331
Europe PubMed Central 34739343
Pubmed 34739343
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