Hypoxia and Activation of Neutrophil Degranulation-Related Genes in the Peripheral Blood of COVID-19 Patients

Area of Science:

• Immunology
• Genomics
• Pathophysiology

Background:

• Severe COVID-19 involves systemic hyper-inflammation and organ damage, necessitating understanding of the immune response cascade.
• Blood transcriptome analysis is a key tool for studying host immune responses in infectious diseases like COVID-19.

Observation:

• Consensus gene dysregulation from 13 COVID-19 transcriptome studies revealed neutrophil degranulation and cell cycle as prominent upregulated categories.
• This contrasts with the classical interferon signaling pathway activation seen in seasonal influenza.

Findings:

• Systemic hypoxia, prevalent in COVID-19, was identified as a potential upstream factor inducing neutrophil degranulation-related genes.
• Gene expression patterns in COVID-19 patients correlated with oxygen intervention needs and were validated in isolated neutrophils.
• Similar gene activation patterns were observed in H1N1 and other severe respiratory viral infections.

Implications:

• Activation of neutrophil degranulation genes in COVID-19 may be partially driven by hypoxia, via HIF-dependent and independent pathways.
• Early detection and intervention for hypoxia could mitigate harmful downstream hyper-inflammation.
• This hypoxia-driven mechanism offers a common pathway applicable to various severe respiratory viral infections and future pandemics.