SARS-CoV-2 post-acute sequelae linked to inflammation via extracellular vesicles

Area of Science:

• Immunology
• Neuroscience
• Infectious Diseases

Background:

• Vaccines reduce COVID-19 severity, but some survivors develop long-term symptoms (PASC).
• This study examines immunological and neurodegenerative effects in COVID-19 survivors 15 months post-infection.
• Extracellular vesicles (EVs) are investigated for their role in PASC.

Purpose of the Study:

• To investigate long-term immunological and neurodegenerative effects in COVID-19 survivors.
• To analyze the role of extracellular vesicles (EVs) in PASC.
• To identify potential biomarkers for virus-induced neurological disorders.

Main Methods:

• Recruited 20 COVID-19 survivors and 13 controls 15 months post-infection.
• Analyzed pro-inflammatory cytokines in plasma and EVs.
• Performed deep immunophenotyping of immune cells and SARS-CoV-2 immunostaining in the colon.

Main Results:

• Elevated pro-inflammatory cytokines and neurofilaments found in EVs of COVID-19 survivors.
• COVID-19 survivors showed altered monocyte activation and cytokine production.
• Changes in T-cells and dendritic cells (DCs), including increased β7-integrin on plasmacytoid DCs, were observed.

Conclusions:

• COVID-19 survivors exhibit persistent immune dysregulation and neurodegeneration.
• EV cargo shows promise for early detection of neurological disorders in PASC.
• Ongoing monitoring of PASC is crucial for patient management.