TY - JOUR T1 - Profiling systemic inflammation and neutrophil function in hospitalized patients with COVID19: results from PREDICT-COVID19 JF - ERJ Open Research JO - erjor DO - 10.1183/23120541.LSC-2022.130 VL - 8 IS - suppl 8 SP - 130 AU - Merete Long AU - Holly R Keir AU - Yan Hui Giam AU - Andrew J M Howden AU - Alejandro J Brenes AU - Christina Rollings AU - Thomas Pembridge AU - Lilia Delgado AU - Hani Abo-Leyah AU - Rebecca C Hull AU - Amy Gilmour AU - Chloe Hughes AU - Rebecca Dowey AU - Helena Turton AU - Benjamin J M New AU - David W Connell AU - Hollian Richardson AU - Roger Thompson AU - Alison M Condliffe AU - Angus I Lamond AU - Diane M Cassidy AU - Amelia Shoemark AU - Doreen A Cantrell AU - James D Chalmers Y1 - 2022/03/10 UR - http://openres.ersjournals.com/content/8/suppl_8/130.abstract N2 - Introduction: COVID19 can cause profound systemic inflammation. Understanding inflammation and immune cell function may allow prediction of outcomes, longer-term effects and identification of further therapeutic targets.Methods: Prospective observational study of patients with PCR-confirmed SARS-CoV-2 enrolled within 96 hours of admission at two UK hospitals(May2020–March2021), with longitudinal sampling up to 29 days. mRNAseq was performed in peripheral blood cells, 45 serum cytokines were measured with Olink Target48 panel, isolated neutrophils were processed for proteomic and functional analyses. Severe disease was defined as requirement for ventilatory support or death within 28 days of admission.Results: 176 COVID19 patients were included (mean age 64.9years, SD13.6), 101 were male (57.4%). 56 patients developed severe disease (31.8%), mortality was 16.5%. A subset underwent neutrophil proteomics (n=81). 19 serum cytokines were significantly associated with severity (p<0.05; ROC analysis), CCL7 had the strongest discriminatory value (AUC 0.78, 95%CI 0.70-0.85). There were 317 significant differentially expressed genes (Wald test with Benjanini-Hochberg correction; p<0.05) at baseline comparing those discharged or still hospitalised at 4 weeks; pathways included complement and B cell activation. Neutrophil proteomics showed upregulation of interferon signalling, which decreased over time but was not linked to severity. Cytokine and toll like receptor levels, plus the eosinophil-associated protein PRG2, were associated with disease severity and outcome.Conclusion: Proteomic and transcriptomic approaches identified changes associated with patient outcomes.FootnotesCite this article as ERJ Open Research 2022; 8: Suppl. 8, 130.This article was presented at the 2022 ERS Lung Science Conference, in session “Poster Session 2”.This is an ERS Lung Science Conference abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only). ER -