The Relationship Between COVID-19 Disease Severity and Zonulin Levels

Area of Science:

• Immunology
• Gastroenterology
• Infectious Diseases

Background:

• Zonulin regulates epithelial permeability and tight junction integrity.
• Disrupted intestinal barrier function can lead to inflammation and immune reactions.
• SARS-CoV-2 infection can affect intestinal cells and trigger systemic inflammation.

Purpose of the Study:

• To investigate the role of zonulin as a mediator in COVID-19 severity.
• To compare serum zonulin levels between COVID-19 patients and healthy controls.
• To assess the correlation between zonulin levels and COVID-19 clinical manifestations and inflammation markers.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to measure serum zonulin levels.
• Blood samples were collected from 30 COVID-19 patients and 35 healthy controls on days 1, 4, and 8 of hospitalization.
• Complete blood count and biochemical inflammatory markers (ESR, CRP, LDH, D-dimer, ferritin, fibrinogen) were analyzed.

Main Results:

• Serum zonulin levels were significantly lower in COVID-19 patients compared to healthy controls (p=0.003).
• Erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels were significantly higher in COVID-19 patients (p<0.001).
• Serum zonulin levels did not show a significant correlation with inflammation markers (ESR, CRP) or disease severity.

Conclusions:

• Lower serum zonulin levels in COVID-19 patients may be associated with a milder clinical course.
• Zonulin does not appear to be a significant mediator of inflammation in COVID-19.
• Further research is needed to elucidate the precise role of zonulin in SARS-CoV-2 infection.