Respiratory syncytial virus (RSV) is a major cause of morbidity and mortality. Previous studies have suggested that T-cell responses may contribute to RSV immunopathology, which could be driven by dendritic cells (DCs). DCs are productively infected by RSV, and during RSV infections, there is an increase of DCs in the lungs with a decrease in the blood. Pediatric populations are particularly susceptible to severe RSV infections; however, DC responses to RSV from pediatric populations have not been examined. In this study, primary isolated DCs from cord blood and adult peripheral blood were compared after RSV infection. Transcriptional profiling and biological network analysis identified transforming growth factor beta (TGF-) and associated signaling molecules as differentially regulated in the two age groups. TGF-1 was decreased in RSV-infected adult-blood DCs but increased in RSV-infected cord blood DCs.
Coculture of adult RSV-infected DCs with autologous T cells induced secretion of gamma interferon (IFN-␥), interleukin 12p70 (IL-12p70), IL-2, and tumor necrosis factor alpha (TNF-␣). Conversely, coculture of cord RSV-infected DCs and autologous T cells induced secretion of IL-4, IL-6, IL-1, and IL-17. Addition of purified TGF-1 to adult DC-T-cell cocultures reduced secretion of IFN-␥, IL-12p70, IL-2, and TNF-␣, while addition of a TGF- chemical inhibitor to cord DC-T-cell cocultures increased secretion of IL-12p70. These data suggest that TGF- acts as a major regulator of RSV DC-T-cell responses, which could contribute to immunopathology during infancy.Human respiratory syncytial virus (RSV), an enveloped negative-strand RNA virus in the family Paramyxoviridae, is the most common viral cause of severe bronchiolitis and pneumonia in infants and young children (10). RSV mainly infects cells of the nasopharynx and lung but can also be detected in circulating blood mononuclear cells (16). Both adaptive and innate responses play a role in protecting hosts from RSV disease. Antibodies do not appear to play a major role in controlling primary infection (25). However, studies using depletion of B lymphocytes indicate that antibodies are necessary for preventing reinfection, and the level of passively acquired anti-RSV maternal antibodies appears to correlate with de-