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10.1182/bloodadvances.2021005246

http://scihub22266oqcxt.onion/10.1182/bloodadvances.2021005246
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suck abstract from ncbi


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pmid34852172      Blood+Adv 2022 ; 6 (3): 866-881
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  • C5a and C5aR1 are key drivers of microvascular platelet aggregation in clinical entities spanning from aHUS to COVID-19 #MMPMID34852172
  • Aiello S; Gastoldi S; Galbusera M; Ruggenenti P; Portalupi V; Rota S; Rubis N; Liguori L; Conti S; Tironi M; Gamba S; Santarsiero D; Benigni A; Remuzzi G; Noris M
  • Blood Adv 2022[Jan]; 6 (3): 866-881 PMID34852172show ga
  • Unrestrained activation of the complement system till the terminal products, C5a and C5b-9, plays a pathogenetic role in acute and chronic inflammatory diseases. In endothelial cells, complement hyperactivation may translate into cell dysfunction, favoring thrombus formation. The aim of this study was to investigate the role of the C5a/C5aR1 axis as opposed to C5b-9 in inducing endothelial dysfunction and loss of antithrombogenic properties. In vitro and ex vivo assays with serum from patients with atypical hemolytic uremic syndrome (aHUS), a prototype rare disease of complement-mediated microvascular thrombosis due to genetically determined alternative pathway dysregulation, and cultured microvascular endothelial cells, demonstrated that the C5a/C5aR1 axis is a key player in endothelial thromboresistance loss. C5a added to normal human serum fully recapitulated the prothrombotic effects of aHUS serum. Mechanistic studies showed that C5a caused RalA-mediated exocytosis of von Willebrand factor (vWF) and P-selectin from Weibel-Palade bodies, which favored further vWF binding on the endothelium and platelet adhesion and aggregation. In patients with severe COVID-19 who suffered from acute activation of complement triggered by severe acute respiratory syndrome coronavirus 2 infection, we found the same C5a-dependent pathogenic mechanisms. These results highlight C5a/C5aR1 as a common prothrombogenic effector spanning from genetic rare diseases to viral infections, and it may have clinical implications. Selective C5a/C5aR1 blockade could have advantages over C5 inhibition because the former preserves the formation of C5b-9, which is critical for controlling bacterial infections that often develop as comorbidities in severely ill patients. The ACCESS trial registered at www.clinicaltrials.gov as #NCT02464891 accounts for the results related to aHUS patients treated with CCX168.
  • |*Atypical Hemolytic Uremic Syndrome[MESH]
  • |*COVID-19[MESH]
  • |Endothelial Cells[MESH]
  • |Humans[MESH]
  • |Platelet Aggregation[MESH]


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