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10.3389/fimmu.2021.784028

http://scihub22266oqcxt.onion/10.3389/fimmu.2021.784028
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suck abstract from ncbi


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pmid34956213      Front+Immunol 2021 ; 12 (ä): 784028
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  • Extracellular Vesicle Associated miRNAs Regulate Signaling Pathways Involved in COVID-19 Pneumonia and the Progression to Severe Acute Respiratory Corona Virus-2 Syndrome #MMPMID34956213
  • Meidert AS; Hermann S; Brandes F; Kirchner B; Buschmann D; Billaud JN; Klein M; Lindemann A; Aue E; Schelling G; Pfaffl MW; Reithmair M
  • Front Immunol 2021[]; 12 (ä): 784028 PMID34956213show ga
  • BACKGROUND: Extracellular vesicles (EVs) are mediators of cell-to-cell communication in inflammatory lung diseases. They function as carriers for miRNAs which regulate mRNA transcripts and signaling pathways after uptake into recipient cells. We investigated whether miRNAs associated with circulating EVs regulate immunologic processes in COVID-19. METHODS: We prospectively studied 20 symptomatic patients with COVID-19 pneumonia, 20 mechanically ventilated patients with severe COVID-19 (severe acute respiratory corona virus-2 syndrome, ARDS) and 20 healthy controls. EVs were isolated by precipitation, total RNA was extracted, profiled by small RNA sequencing and evaluated by differential gene expression analysis (DGE). Differentially regulated miRNAs between groups were bioinformatically analyzed, mRNA target transcripts identified and signaling networks constructed, thereby comparing COVID-19 pneumonia to the healthy state and pneumonia to severe COVID-19 ARDS. RESULTS: DGE revealed 43 significantly and differentially expressed miRNAs (25 downregulated) in COVID-19 pneumonia when compared to controls, and 20 miRNAs (15 downregulated) in COVID-19 ARDS patients in comparison to those with COVID-19 pneumonia. Network analysis for comparison of COVID-19 pneumonia to healthy controls showed upregulated miR-3168 (log2FC=2.28, p(adjusted)<0.001), among others, targeting interleukin-6 (IL6) (25.1, 15.2 - 88.2 pg/ml in COVID-19 pneumonia) and OR52N2, an olfactory smell receptor in the nasal epithelium. In contrast, miR-3168 was significantly downregulated in COVID-19 ARDS (log2FC=-2.13, p(adjusted)=0.003) and targeted interleukin-8 (CXCL8) in a completely activated network. Toll-like receptor 4 (TLR4) was inhibited in COVID-19 pneumonia by miR-146a-5p and upregulated in ARDS by let-7e-5p. CONCLUSION: EV-derived miRNAs might have important regulative functions in the pathophysiology of COVID-19: CXCL8 regulates neutrophil recruitment into the lung causing epithelial damage whereas activated TLR4, to which SARS-CoV-2 spike protein binds strongly, increases cell surface ACE2 expression and destroys type II alveolar cells that secrete pulmonary surfactants; both resulting in pulmonary-capillary leakage and ARDS. These miRNAs may serve as biomarkers or as possible therapeutic targets.
  • |Aged[MESH]
  • |Aged, 80 and over[MESH]
  • |Biomarkers/*blood[MESH]
  • |COVID-19/*immunology/pathology[MESH]
  • |Disease Progression[MESH]
  • |Extracellular Vesicles/*immunology[MESH]
  • |Female[MESH]
  • |Humans[MESH]
  • |Male[MESH]
  • |MicroRNAs/*immunology[MESH]
  • |Middle Aged[MESH]
  • |Pneumonia/immunology/pathology[MESH]
  • |SARS-CoV-2[MESH]


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