Respiratory epithelial-cell surfaces present a large interface with the external environment and provide the first line of defense against a broad array of microbes. Initially perceived as a passive barrier between the host and the environment, the lung is now known to constitute a robust system of immune surveillance that include epithelial cells as well as highly specialized professional antigen presenting cells (APC) distributed throughout the conducting airways and the lung parenchyma. However, the critical elements required for development of protective immunity and the maintenance of immune homeostasis in the lung are largely unknown, particularly in the steady state in the human. This is important because uncontrolled or skewed immunity in the lung might lead to illness as for example might be the case in the link between RSV infection in childhood and increased susceptibility to asthma in adult life. Dendritic cells (DC) play a pivotal role in initiating the immune response to foreign antigens and in the maintenance of tolerance to self antigens. Drs Merad and Palucka laboratories have been working on the mechanisms that control the development and function of DC for more than ten years. Recent data from our groups revealed that the DC networks in nonlymphoid tissues consist of developmentally distinct and functionally specialized DC subsets in mice and humans. In this application, we propose to establish the functional specialization of the DC network in the lung and identify the mechanisms that control DC functional specialization in the induction of mucosal antiviral immunity. We will do so by studying mouse DC in vivo, human DC in humanized mice models as well as human lung. In our preliminary studies we have used influenza virus to probe the function of DC subsets in the lung. GFP-expressing virus differently interacts with distinct DC subsets. We show that distinct DC subsets preferentially interact with CD4+ or CD8+ T cells. These results support our hypothesis that the lung DC network consists of different subsets that differently control the induction of cellular and humoral immunity to respiratory viruses. Research proposed will be carried out through a collaborative effort between three established investigators with distinct and complementary expertise uniquely suited to address the central hypothesis of this application. The PI of this application, Dr. Miriam Merad (Mount Sinai School of Medicine (MSSM)) is an expert in mouse DC biology and has made several key contributions to our understanding of mucosal DC development and function in mice. Dr. Karolina Palucka (Joint investigator at Baylor Institute for Immunology Research (BUR) and MSSM) is a world expert in human DC biology and in humanized mouse models. Dr. Adolfo Garcia Sastre (MSSM) is a virologist and a world expert in influenza virus. In addition, Dr. Christian Becker (a pulmonologist at MSSM and a member of Merad's laboratory) has developed a strong human lung explants program with access to more than 100 fresh human lung samples per year.

Public Health Relevance

The critical elements required for development of protective immunity and the maintenance of immune homeostasis in the lung are largely unknown, particularly in the steady state in the human. Here we propose to use mouse models of lung viral infections, humanized mice models and human lung explants to examine the role of dendritic cells subsets in the modulation of mucosal immune defense mechanisms.

National Institute of Health (NIH)
Research Project--Cooperative Agreements (U01)
Project #
Application #
Study Section
Special Emphasis Panel (ZAI1)
Program Officer
Rothermel, Annette L
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Icahn School of Medicine at Mount Sinai
Internal Medicine/Medicine
Schools of Medicine
New York
United States
Zip Code
Mortha, Arthur; Chudnovskiy, Aleksey; Hashimoto, Daigo et al. (2014) Microbiota-dependent crosstalk between macrophages and ILC3 promotes intestinal homeostasis. Science 343:1249288
Martin, J C J; Beriou, G; Heslan, M et al. (2014) Interleukin-22 binding protein (IL-22BP) is constitutively expressed by a subset of conventional dendritic cells and is strongly induced by retinoic acid. Mucosal Immunol 7:101-13
Yu, Chun I; Becker, Christian; Metang, Patrick et al. (2014) Human CD141+ dendritic cells induce CD4+ T cells to produce type 2 cytokines. J Immunol 193:4335-43
Muller, Paul Andrew; Koscsó, Balázs; Rajani, Gaurav Manohar et al. (2014) Crosstalk between muscularis macrophages and enteric neurons regulates gastrointestinal motility. Cell 158:300-13
Wang, Xingyu; Wang, Junmei; Zheng, Hong et al. (2014) Differential requirement for the IKK?/NF-?B signaling module in regulating TLR- versus RLR-induced type 1 IFN expression in dendritic cells. J Immunol 193:2538-45
Rajsbaum, Ricardo; Garcia-Sastre, Adolfo; Versteeg, Gijs A (2014) TRIMmunity: the roles of the TRIM E3-ubiquitin ligase family in innate antiviral immunity. J Mol Biol 426:1265-84
Schotsaert, Michael; García-Sastre, Adolfo (2014) Influenza vaccines: a moving interdisciplinary field. Viruses 6:3809-26
Khosravi, Arya; Yáñez, Alberto; Price, Jeremy G et al. (2014) Gut microbiota promote hematopoiesis to control bacterial infection. Cell Host Microbe 15:374-81
Pérez-Girón, José V; Belicha-Villanueva, Alan; Hassan, Ebrahim et al. (2014) Mucosal polyinosinic-polycytidylic acid improves protection elicited by replicating influenza vaccines via enhanced dendritic cell function and T cell immunity. J Immunol 193:1324-32
Rajsbaum, Ricardo; Versteeg, Gijs A; Schmid, Sonja et al. (2014) Unanchored K48-linked polyubiquitin synthesized by the E3-ubiquitin ligase TRIM6 stimulates the interferon-IKK? kinase-mediated antiviral response. Immunity 40:880-95

Showing the most recent 10 out of 24 publications