Abstract
S100A8/A9, also known as “calprotectin” or “MRP8/14,” is an alarmin primarily secreted by activated myeloid cells with antimicrobial, proinflammatory, and prothrombotic properties. Increased plasma levels of S100A8/A9 in thrombo-inflammatory diseases are associated with thrombotic complications. We assessed the presence of S100A8/A9 in the plasma and lung autopsies from patients with COVID-19 and investigated the molecular mechanism by which S100A8/A9 affects platelet function and thrombosis. S100A8/A9 plasma levels were increased in patients with COVID-19 and sustained high levels during hospitalization correlated with poor outcomes. Heterodimeric S100A8/A9 was mainly detected in neutrophils and deposited on the vessel wall in COVID-19 lung autopsies. Immobilization of S100A8/A9 with collagen accelerated the formation of a fibrin-rich network after perfusion of recalcified blood at venous shear. In vitro, platelets adhered and partially spread on S100A8/A9, leading to the formation of distinct populations of either P-selectin or phosphatidylserine (PS)-positive platelets. By using washed platelets, soluble S100A8/A9 induced PS exposure but failed to induce platelet aggregation, despite GPIIb/IIIa activation and alpha-granule secretion. We identified GPIbα as the receptor for S100A8/A9 on platelets inducing the formation of procoagulant platelets with a supporting role for CD36. The effect of S100A8/A9 on platelets was abolished by recombinant GPIbα ectodomain, platelets from a patient with Bernard-Soulier syndrome with GPIb-IX-V deficiency, and platelets from mice deficient in the extracellular domain of GPIbα. We identified the S100A8/A9-GPIbα axis as a novel targetable prothrombotic pathway inducing procoagulant platelets and fibrin formation, in particular in diseases associated with high levels of S100A8/A9, such as COVID-19.
Original language | English |
---|---|
Pages (from-to) | 2626-2643 |
Number of pages | 18 |
Journal | Blood |
Volume | 140 |
Issue number | 24 |
DOIs | |
Publication status | Published - 15 Dec 2022 |
Bibliographical note
Funding Information:J.R. holds a British Heart Foundation (BHF) Intermediate Fellowship (FS/IBSRF/20/25039). This research was partially supported by a BHF project grant (PG/21/10737), the BHF Accelerator Award (AA/18/2/34218), UK Spine Knowledge exchange (R78606/CN003), and the Medical Research Council (Grant Number MC_PC_19029) for J.R. M.C. is supported by the Wellcome Trust 4 Year PhD studentship program on Mechanisms of Inflammatory Disease (204951). A.A. is supported by the Austrian Science Fund (P32064 and P34783). G.P. is supported by a Birmingham-Maastricht studentship. S.P.W. holds a BHF Chair (CH03/003). A.O.K. is a Henry Wellcome fellow (218649/Z/19/Z). N.J.M. is supported by University of Aberdeen Development Trust and National Health Service Grampian Endowment funds (COV19-004 and 20/021). A.J.I. holds a Birmingham fellowship.
Acknowledgments:
The authors thank Beata Grygielska for genotyping mice and University of Birmingham Enterprise Ltd or the translational Research Team for their support. J.R. holds a British Heart Foundation (BHF) Intermediate Fellowship (FS/IBSRF/20/25039). This research was partially supported by a BHF project grant (PG/21/10737), the BHF Accelerator Award (AA/18/2/34218), UK Spine Knowledge exchange (R78606/CN003), and the Medical Research Council (Grant Number MC_PC_19029) for J.R. M.C. is supported by the Wellcome Trust 4 Year PhD studentship program on Mechanisms of Inflammatory Disease (204951). A.A. is supported by the Austrian Science Fund (P32064 and P34783). G.P. is supported by a Birmingham-Maastricht studentship. S.P.W. holds a BHF Chair (CH03/003). A.O.K. is a Henry Wellcome fellow (218649/Z/19/Z). N.J.M. is supported by University of Aberdeen Development Trust and National Health Service Grampian Endowment funds (COV19-004 and 20/021). A.J.I. holds a Birmingham fellowship. Contribution: M.C. designed and performed experiments, collected and analyzed data, and wrote the manuscript; W.C.S. G.P. M.J.S. J.P. J.C.C. J.B. J.S.R. Z.Z. and A.S. performed experiments and analyzed data; J.H.B. and A.O.K. analyzed data; M.P. N.S.P. P.L.R.N. P.H. A.J.I. G.E.R. S.P.W. and M.R.T. provided key reagents and contributed to data analysis; N.J.M. and A.A. provided key reagents and supported research analysis; J.R. designed research and experiments, performed experiments, collected and analyzed data, and wrote the manuscript; and all authors read and approved the paper.
Keywords
- S100A8/A9
- calprotectin
- fibrin
- procoagulant platelets
- GPIbα
- Calgranulin A/metabolism
- Phosphatidylserines/metabolism
- Fibrin/metabolism
- Blood Platelets/metabolism
- Platelet Aggregation
- Animals
- COVID-19/metabolism
- Mice