Details

Autor(en) / Beteiligte

• Cabrera, Luz E
• Pekkarinen, Pirkka T
• Alander, Maria
• Nowlan, Kirsten H. A
• Nguyen, Ngoc Anh
• Jokiranta, Suvi
• Kuivanen, Suvi
• Patjas, Anu
• Mero, Sointu
• Pakkanen, Sari H
• Heinonen, Santtu
• Kantele, Anu
• Vapalahti, Olli
• Kekäläinen, Eliisa
• Strandin, Tomas
• Diamond, Michael S.

Titel

Characterization of low-density granulocytes in COVID-19

Ist Teil von

• PLoS pathogens, 2021-07, Vol.17 (7), p.e1009721-e1009721

Ort / Verlag

San Francisco: Public Library of Science

Erscheinungsjahr

2021

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• Severe COVID-19 is characterized by extensive pulmonary complications, to which host immune responses are believed to play a role. As the major arm of innate immunity, neutrophils are one of the first cells recruited to the site of infection where their excessive activation can contribute to lung pathology. Low-density granulocytes (LDGs) are circulating neutrophils, whose numbers increase in some autoimmune diseases and cancer, but are poorly characterized in acute viral infections. Using flow cytometry, we detected a significant increase of LDGs in the blood of acute COVID-19 patients, compared to healthy controls. Based on their surface marker expression, COVID-19-related LDGs exhibit four different populations, which display distinctive stages of granulocytic development and most likely reflect emergency myelopoiesis. Moreover, COVID-19 LDGs show a link with an elevated recruitment and activation of neutrophils. Functional assays demonstrated the immunosuppressive capacities of these cells, which might contribute to impaired lymphocyte responses during acute disease. Taken together, our data confirms a significant granulocyte activation during COVID-19 and suggests that granulocytes of lower density play a role in disease progression.