Human Monocytes - CD14, CD16 - Ziegler-Heitbrock

Contact

Dynamic changes in monocytes subsets in COVID-19 patients.

Abstract

BACKGROUND: Coronavirus disease 2019 (COVID-19) is affecting the whole world and threatening human health. We aim to investigate the immunological characteristics of monocytes in critical patients with COVID-19. METHODS: The number and immune status of monocytes were detected by flow cytometry in 32 COVID-19 patients and 18 healthy individuals. RESULTS: In critical patients with COVID-19, the absolute number of total monocytes and CD16- monocytes was significantly decreased but CD16+ pro-inflammatory monocytes was increased compared to healthy controls. Antigen presentation potential of monocytes, as measured by HLA-DR expression, was suppressed, while their inflammatory phenotype (CD38 expression) was enhanced. Cytokine levels showed sustained increases in critical patients. And the levels of IL-6 were positively correlated with CD16+ monocytes number. IL-6 and IL-10 levels were negatively correlated with HLA-DR expression of monocytes. During the recovery of COVID-19 patients, the count and immune status of monocyte subsets were restored by degrees. HLA-DR+ monocytes possessed good sensitivity and specificity for predicting the incidence of critical patients with COVID-19. CONCLUSIONS: In critical patients with COVID-19, decline in number and HLA-DR expression of monocytes might lead to decreased antigen presentation potential and thus immunosuppression, while increased CD16+ pro-inflammatory monocytes might mediate hyperinflammation. HLA-DR+ monocytes might be a meaningful assisted indicator to predict the incidence of critical patients with COVID-19.

Authors: Qin S, Jiang Y, Wei X, Liu X, Guan J, Chen Y, Lu H, Qian J, Wang Z, Lin X,
Journal: Hum Immunol; 2021 Mar;82(3):170-176.. doi:10.1016/j.humimm.2020.12.010
Year: 2021
PubMed: PMID: 33531264 (Go to PubMed)