The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causing COVID-19 is associated with excessive inflammation, as a main reason for severe condition and death. Increased inflammatory cytokines and humoral response to SARS-CoV-2 correlate with COVID-19 immunity and pathogenesis. Importantly, the levels of pro-inflammatory cytokines that increase profoundly in systemic circulation appear as part of the clinical pictures of two overlapping conditions, sepsis and the hemophagocytic syndromes. Both conditions can develop lethal inflammatory responses that lead to tissue damage, however, in many patients hemophagocytic lymphohistiocytosis (HLH) can be differentiated from sepsis. This is a key issue because the life-saving aggressive immunosuppressive treatment, required in the HLH therapy, is absent in sepsis guidelines. This paper aims to describe the pathophysiology and clinical relevance of these distinct entities in the course of COVID-19 that resemble sepsis and further highlights two effector arms of the humoral immune response (inflammatory cytokine and immunoglobulin production) during COVID-19 infection.
【저자키워드】 Antibody Response, SARS-CoV-2, Severe acute respiratory syndrome coronavirus 2, Sepsis, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), ACE2, angiotensin-converting enzyme 2, 2019 novel coronavirus disease (COVID-19), MERS-CoV, Middle Eastern respiratory syndrome coronavirus, ARDS, acute respiratory distress syndrome, IGM, immunoglobulin m, WHO, World Health Organization, Hemophagocytic lymphohistiocytosis (HLH), ICU, Intensive care unit, CoV, coronavirus, AST, aspartate aminotransferase, CCL2, chemokine C–C motif ligand 2, TNF-α, tumor necrosis factor alpha, CRS, Cytokine release syndrome, HLH, Hemophagocytic lymphohistiocytosis, NK cell, natural killer cell, G-CSF, granulocyte colony-stimulating factor, IP-10, interferon-inducible protein 10, IFNγ, interferon gamma, ScRNA-Seq, Single-cell RNA sequencing, ELISA, enzyme-linked immunoassay, IL-1β, Interleukin-1β, COVID-19, 2019 novel coronavirus disease, MCP1, monocyte chemoattractant protein 1, MIP1a, inflammatory protein 1a, CAR T cells, Chimeric antigen receptor T cells, NFIL3, ETS2, nuclear factor regulated by IL-3, PHLDA2, Pleckstrin Homology Like Domain Family A Member 2, PB, plasmablast, SOFA, Sequential/Sepsis-related Organ Failure Assessment, SHLHOS, sepsis-HLH overlap syndrome,