1. Multi-Design Differential Expression Profiling of COVID-19 Lung Autopsy Specimens Reveals Significantly Deregulated Inflammatory Pathways and SFTPC Impaired Transcription
- Author
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Matteo Fassan, Antonio Collesei, Valentina Angerilli, Marta Sbaraglia, Francesco Fortarezza, Federica Pezzuto, Monica De Gaspari, Gianluca Businello, Margherita Moni, Stefania Rizzo, Giulia Traverso, Veronica Colosso, Elisa Taschin, Francesca Lunardi, Aida Freire Valls, Francesca Schiavi, Cristina Basso, Fiorella Calabrese, and Angelo Paolo Dei Tos
- Subjects
Inflammation ,Transcriptomic profiling ,SARS-CoV-2 ,COVID-19 ,autopsy ,transcriptomic profiling ,inflammation ,complement ,Complement ,Humans ,Autopsy ,General Medicine ,Lung ,Pulmonary Surfactant-Associated Protein C ,Cathepsin C - Abstract
The transcriptomic profiling of lung damage associated with SARS-CoV-2 infection may lead to the development of effective therapies to prevent COVID-19-related deaths. We selected a series of 21 autoptic lung samples, 14 of which had positive nasopharyngeal swabs for SARS-CoV-2 and a clinical diagnosis of COVID-19-related death; their pulmonary viral load was quantified with a specific probe for SARS-CoV-2. The remaining seven cases had no documented respiratory disease and were used as controls. RNA from formalin-fixed paraffin-embedded (FFPE) tissue samples was extracted to perform gene expression profiling by means of targeted (Nanostring) and comprehensive RNA-Seq. Two differential expression designs were carried out leading to relevant results in terms of deregulation. SARS-CoV-2 positive specimens presented a significant overexpression in genes of the type I interferon signaling pathway (IFIT1, OAS1, ISG15 and RSAD2), complement activation (C2 and CFB), macrophage polarization (PKM, SIGLEC1, CD163 and MS4A4A) and Cathepsin C (CTSC). CD163, Siglec-1 and Cathepsin C overexpression was validated by immunohistochemistry. SFTPC, the encoding gene for pulmonary-associated surfactant protein C, emerged as a key identifier of COVID-19 patients with high viral load. This study successfully recognized SARS-CoV-2 specific immune signatures in lung samples and highlighted new potential therapeutic targets. A better understanding of the immunopathogenic mechanisms of SARS-CoV-2 induced lung damage is required to develop effective individualized pharmacological strategies.
- Published
- 2022