Mild Coronavirus Disease 2019 (COVID-19) Is Marked by Systemic Oxidative Stress: A Pilot Study

• Published in: Antioxidants Vol. 10; no. 12; p. 2022
• Main Authors: van Eijk, Larissa E, Tami, Adriana, Hillebrands, Jan-Luuk, den Dunnen, Wilfred F A, de Borst, Martin H, van der Voort, Peter H J, Bulthuis, Marian L C, Veloo, Alida C M, Wold, Karin I, Vincenti González, María F, van der Gun, Bernardina T F, van Goor, Harry, Bourgonje, Arno R
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 20-12-2021; MDPI
• Subjects: Automation; Coronaviruses; COVID-19; Creatinine; free thiols; Hospitalization; Hypertension; Hypoxia; Laboratories; Oxidative stress; Pandemics; Pathogenesis; Pathophysiology; Patients; Proteins; Reactive oxygen species; redox; Regression analysis; Severe acute respiratory syndrome coronavirus 2; Software; Sulfhydryl groups; Therapeutic targets; Thiols; United States > US; Germany; COVID-19; free thiols; oxidative stress; redox
• ISSN: 2076-3921; 2076-3921
• DOI: 10.3390/antiox10122022

Oxidative stress has been implicated to play a critical role in the pathophysiology of coronavirus disease 2019 (COVID-19) and may therefore be considered as a relevant therapeutic target. Serum free thiols (R-SH, sulfhydryl groups) comprise a robust marker of systemic oxidative stress, since they are readily oxidized by reactive oxygen species (ROS). In this study, serum free thiol concentrations were measured in hospitalized and non-hospitalized patients with COVID-19 and healthy controls and their associations with relevant clinical parameters were examined. Serum free thiol concentrations were measured colorimetrically (Ellman's method) in 29 non-hospitalized COVID-19 subjects and 30 age-, sex-, and body-mass index (BMI)-matched healthy controls and analyzed for associations with clinical and biochemical disease parameters. Additional free thiol measurements were performed on seven serum samples from COVID-19 subjects who required hospitalization to examine their correlation with disease severity. Non-hospitalized subjects with COVID-19 had significantly lower concentrations of serum free thiols compared to healthy controls (
= 0.014), indicating oxidative stress. Serum free thiols were positively associated with albumin (St. β = 0.710,
0.001) and inversely associated with CRP (St. β = -0.434,
= 0.027), and showed significant discriminative ability to differentiate subjects with COVID-19 from healthy controls (AUC = 0.69,
= 0.011), which was slightly higher than the discriminative performance of CRP concentrations regarding COVID-19 diagnosis (AUC = 0.66,
= 0.042). This study concludes that systemic oxidative stress is increased in patients with COVID-19 compared with healthy controls. This opens an avenue of treatment options since free thiols are amenable to therapeutic modulation.