Rewired type I IFN signaling is linked to age-dependent differences in COVID-19

Area of Science:

• Immunology
• Molecular Biology
• Gerontology

Background:

• Advanced age is a primary risk factor for severe COVID-19 outcomes.
• Mechanistic understanding of age-related immune dysfunction in infection is limited.

Purpose of the Study:

• To investigate the molecular and cellular mechanisms underlying age-related immune responses to SARS-CoV-2 infection.
• To elucidate how aging impacts immune signaling pathways and cellular populations.

Main Methods:

• Multi-omics analysis of 164 SARS-CoV-2-infected individuals across a wide age range (1-84 years).
• Analysis of immune cell populations, cytokine release, and immunoglobulin production.

Main Results:

• Aged individuals exhibit a shift in type I interferon (IFN) signaling from STAT1 to STAT3 activation in monocytes, CD4+ T cells, and B cells.
• This IFN signaling rewiring is linked to increased inflammation, cytokine release, and altered T cell dynamics.
• Aging correlates with a shift in B cell populations, influencing immunoglobulin A and G production.

Conclusions:

• Aging fundamentally rewires immune signaling pathways, predisposing individuals to inflammation-prone responses during infections like COVID-19.
• The study provides a mechanistic basis for age-associated pathology and severe disease outcomes.