Study 72 of 75Glutathione (GSH) literaturebiorxiv-preprint · Observational2026

Methylglyoxal/Glyoxalase-1/Glutathione Biomarker Panel for Long COVID

This study suggests that a biomarker panel including methylglyoxal, glyoxalase-1, and glutathione may be associated with Long COVID symptoms.

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Where it sits

this study against the rest of the glutathione (gsh) corpus

Preclinical

Observational · this one

Open-label

Randomised

Reviews

Summary and findings

This study compared plasma biomarkers between 30 individuals with Long COVID and 30 controls. It measured levels of methylglyoxal, glyoxalase-1, and glutathione, finding significant differences in these biomarkers. The study suggests a potential biomarker panel related to Long COVID symptoms.

How much of this paper we could read: full text read (0.80). We had a clear abstract, so the summary below closely tracks the paper. What this means →

Individuals with LC exhibited approximately 200% higher MG compared to controls.2026

Abstract

The authors’ words, as biorxiv-preprint supplied them

<h4>Background: </h4> Long COVID (LC) affects millions worldwide, causing diverse symptoms, from fatigue, dyspnea, and cough to multiorgan complications. Immune activation, endothelial dysfunction, hypoxia, and metabolic dysregulation are implicated, although mechanisms remain unclear. This study aimed to identify a biomarker panel linking endothelial dysfunction, hypoxia, and metabolic shifting to diverse LC symptoms. <h4>Methods:</h4> Plasma biomarkers were compared between 30 individuals with LC and 30 controls. Glucotoxic methylglyoxal, glyoxalase-1 and glutathione, indicators of methylglyoxal detoxification, soluble VAP-1 (sVAP-1, SSAO), TNF-α, and IL-1β were assessed. STRING and molecular docking explored protein associations and potential MG–Glo-1 interactions. <h4>Results:</h4> Compared with controls, individuals with LC exhibited approximately 200% higher MG, 20% lower glyoxalase-1, 45% lower glutathione, and 50% higher SSAO activity. TNF-α and IL-1 increased 165% and 145%, respectively. Symptom numbers correlated with methylglyoxal (r = 0.65) and inversely with Glo-1 (r = −0.61) and GSH (r = −0.47), but not SSAO, TNF-α, or IL-1β. Methylglyoxal was inversely correlated with glyoxalase-1 (r = −0.59) and GSH (r = −0.67), but not SSAO, TNF-α, or IL-1β. STRING analysis predicted associations involving glyoxalase-1, VAP-1, and other proteins, while docking suggested MG interaction with glyoxalase-1(−4.82 kcal/mol). <h4>Conclusion:</h4> MG/Glo-1/glutathione represents a novel biomarker panel for diverse LC symptoms.

Background

Not reported in abstract.

Methods

Not reported in abstract.

Results

Not reported in abstract.

Interpretation

Not reported in abstract.

Limitations

Not reported in abstract.

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