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However, the underlying immunological basis remains unclear. To define the biological implications of TS21 in airway epithelial cells (AECs), the primary site of respiratory virus entry and host defense, in this study we investigated RSV-induced responses in primary nasal AECs from pediatric donors of euploid and trisomic cells. We used comprehensive approaches to assess baseline IFN\u2013JAK-STAT signaling; viral infectivity; and the production of Type III IFN\/\u03bb1, proinflammatory cytokines, and chemokines before and after RSV exposure. TS21 AECs exhibited baseline hyperactive IFN-JAK-STAT signaling and reduced RSV infectivity but also showed impaired Type III IFN responses during viral infection. Furthermore, TS21 AECs demonstrated a robust proinflammatory state, with upregulated leukocyte\/neutrophil chemotaxis pathways and heightened CXCL5\/CXCL10 production before and after RSV exposure. This pattern was recapitulated in infants with DS who had severe viral bronchiolitis, exhibiting a dysregulated airway immune response characterized by diminished Type III IFN and excessive CXCL5\/CXCL10 production. Our results suggest that RSV severity in DS is not due to enhanced viral infectivity but, rather, to dysregulated airway proinflammatory responses, offering new therapeutic opportunities to mitigate the severity of RSV infection in children with DS.<\/jats:p>","DOI":"10.1165\/rcmb.2025-0068oc","type":"journal-article","created":{"date-parts":[[2025,6,30]],"date-time":"2025-06-30T17:08:05Z","timestamp":1751303285000},"page":"951-964","update-policy":"https:\/\/doi.org\/10.1164\/crossmarkpolicies","source":"Crossref","is-referenced-by-count":8,"title":["Down Syndrome Alters Type III IFN and Proinflammatory Airway Epithelial Responses to Respiratory Syncytial Virus Infection"],"prefix":"10.1093","volume":"73","author":[{"given":"Elizabeth","family":"Chorvinsky","sequence":"first","affiliation":[{"name":"Division of Pediatric Pulmonary and Sleep Medicine and"},{"name":"Center for Genetic Medicine Research, Children\u2019s National Research Institute, Washington, District of 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