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Explaining COVID-19 postvaccination-related immune thrombotic thrombocytopenia: a hypothesis-generating in-silico approach.
Konstantinou, George N.
  • Konstantinou GN; Department of Allergy and Clinical Immunology, 424 General Military Training Hospital, Thessaloniki, Greece.
Hum Vaccin Immunother ; 18(5): 2050654, 2022 11 30.
Article in English | MEDLINE | ID: covidwho-1784264
ABSTRACT
Cases that experienced COVID-19 postvaccination-related thrombosis have been reported after the first dose of ChAdOx1 nCov-19 (Vaxzevria, AstraZeneca) or Ad26.COV2.S (Johnson & Johnson/Janssen) vaccine. These rare thrombotic events were observed within the expected vaccine-induced seroconversion period and could be attributed to platelet-activating (auto)antibodies against platelet factor 4 (PF4). Newly, vaccine-induced, cross-reactive anti-PF4 antibodies could explain this observation. An in-silico analysis using the Basic Local Alignment Search Tool was used to identify sequence similarity between PF4 and antigens contained in or encoded by ChAdOx1 nCov-19 or Ad26.COV2.S vaccines. Only one sequence within the signaling peptide of the SARS-CoV-2 spike protein exhibited a high percent identity (85.71%) with PF4. This sequence overlaps with a proven immunogenic peptide recognized from convalescent COVID-19 sera and could be responsible for the formation of platelet-activating immunocomplexes in susceptible patients. Manipulation of the immunogenicity of this particular sequence within the encoded SARS-CoV-2 spike protein signaling peptide may eliminate this iatrogenic severe adverse effect.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Thrombocytopenia / Thrombosis / Purpura, Thrombocytopenic, Idiopathic / COVID-19 Type of study: Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Humans Language: English Journal: Hum Vaccin Immunother Year: 2022 Document Type: Article Affiliation country: 21645515.2022.2050654

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Thrombocytopenia / Thrombosis / Purpura, Thrombocytopenic, Idiopathic / COVID-19 Type of study: Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Humans Language: English Journal: Hum Vaccin Immunother Year: 2022 Document Type: Article Affiliation country: 21645515.2022.2050654