The in vivo infusion of hydrogen peroxide induces oxidative stress and differentially affects the activities of small intestinal carbohydrate digestive enzymes in the neonatal pig. — CFSMEATLAS
E3 PreliminaryPreliminaryPEM not requiredRCTPeer-reviewedMachine draft
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The in vivo infusion of hydrogen peroxide induces oxidative stress and differentially affects the activities of small intestinal carbohydrate digestive enzymes in the neonatal pig.
Lackeyram, D, Mine, Y, Widowski, T et al. · Journal of animal science · 2012 · DOI
Quick Summary
Researchers gave young pigs either hydrogen peroxide (a substance that causes oxidative stress, similar to cellular damage) or saline over 10 days to study how oxidative stress might affect ME/CFS. Pigs given hydrogen peroxide showed reduced antioxidant levels, less physical activity, and decreased ability to digest certain carbohydrates in their intestines. This suggests that oxidative stress may interfere with how the gut breaks down food, which could contribute to fatigue and other ME/CFS symptoms.
Why It Matters
ME/CFS is known to involve oxidative stress, but the mechanisms linking cellular damage to fatigue remain unclear. This study provides experimental evidence that oxidative stress can selectively impair intestinal enzyme function and reduce physical activity, suggesting a potential biological pathway connecting oxidative damage to ME/CFS symptoms. Understanding these mechanisms could lead to targeted therapeutic interventions addressing gut dysfunction in ME/CFS patients.
Observed Findings
Piglets infused with hydrogen peroxide showed 65% lower plasma reduced glutathione levels compared to pre-infusion baseline
Oxidative stress group exhibited reduced physical mobility compared to controls
Lactase activity decreased from 12.65 to 6.54 μmol/(mg protein·min) in the oxidative stress group
Maltase activity decreased from 75.60 to 57.39 μmol/(mg protein·min) in the oxidative stress group
Sucrase and maltase-glucoamylase activities were not significantly affected by oxidative stress
Inferred Conclusions
Oxidative stress induces a disease state in neonatal pigs with features resembling CFS (reduced mobility, fatigue-like behavior)
Oxidative stress differentially impairs specific carbohydrate-digesting enzymes while sparing others
Reduced intestinal carbohydrate digestion may contribute to fatigue and other CFS-like symptoms
Lactase and maltase are particularly vulnerable to oxidative damage in the gut
Remaining Questions
Do the same differential enzyme effects occur in adult humans with ME/CFS, or is this pattern specific to neonatal physiology?
What This Study Does Not Prove
This animal model study does not prove that oxidative stress causes ME/CFS in humans or that the same enzyme defects occur in ME/CFS patients. The findings are correlational within an artificial oxidative stress model and do not establish whether intestinal enzyme dysfunction is primary or secondary in ME/CFS pathogenesis. Results from neonatal pigs may not translate directly to adult human physiology or disease.
Tags
Symptom:Fatigue
Biomarker:Blood Biomarker
Phenotype:Pediatric
Method Flag:PEM Not DefinedWeak Case DefinitionSmall SampleExploratory Only
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →