
| 10.1182/bloodadvances.2021006680
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 35420680!9015715!35420680
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Blood+Adv 2022 ; 6 (17): 5085-5099 Nephropedia Template TP
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Platelet-monocyte interaction amplifies thromboinflammation through tissue factor signaling in COVID-19 #MMPMID35420680Hottz ED; Martins-Goncalves R; Palhinha L; Azevedo-Quintanilha IG; de Campos MM; Sacramento CQ; Temerozo JR; Soares VC; Dias SSG; Teixeira L; Castro I; Righy C; Souza TML; Kurtz P; Andrade BB; Nakaya HI; Monteiro RQ; Bozza FA; Bozza PTBlood Adv 2022[Sep]; 6 (17): 5085-5099 PMID35420680show ga
Accumulating evidence into the pathogenesis of COVID-19 highlights a hypercoagulability state with high risk of life-threatening thromboembolic complications. However, the mechanisms of hypercoagulability and their link to hyperinflammation remain poorly understood. Here, we investigate functions and mechanisms of platelet activation and platelet-monocyte interactions in inflammatory amplification during SARS-CoV-2 infection. We used a combination of immunophenotyping, single-cell analysis, functional assays, and pharmacological approaches to gain insights on mechanisms. Critically ill patients with COVID-19 exhibited increased platelet-monocyte aggregates formation. We identified a subset of inflammatory monocytes presenting high CD16 and low HLA-DR expression as the subset mainly interacting with platelets during severe COVID-19. Single-cell RNA-sequencing analysis indicated enhanced fibrinogen receptor Mac-1 in monocytes from patients with severe COVID-19. Monocytes from patients with severe COVID-19 displayed increased platelet binding and hyperresponsiveness to P-selectin and fibrinogen with respect to tumor necrosis factor-alpha and interleukin-1beta secretion. Platelets were able to orchestrate monocyte responses driving tissue factor (TF) expression, inflammatory activation, and inflammatory cytokines secretion in SARS-CoV-2 infection. Platelet-monocyte interactions ex vivo and in SARS-CoV-2 infection model in vitro reciprocally activated monocytes and platelets, inducing the heightened secretion of a wide panel of inflammatory mediators. We identified platelet adhesion as a primary signaling mechanism inducing mediator secretion and TF expression, whereas TF signaling played major roles in amplifying inflammation by inducing proinflammatory cytokines, especially tumor necrosis factor-alpha and interleukin-1beta. Our data identify platelet-induced TF expression and activity at the crossroad of coagulation and inflammation in severe COVID-19.|*COVID-19[MESH]|*Thrombophilia[MESH]|*Thrombosis/metabolism[MESH]|Blood Platelets/metabolism[MESH]|Cytokines/metabolism[MESH]|Humans[MESH]|Inflammation/pathology[MESH]|Interleukin-1beta/metabolism[MESH]|Monocytes/metabolism[MESH]|SARS-CoV-2[MESH]|Thromboinflammation[MESH]|Thromboplastin/metabolism[MESH]
  
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