Rapid Myoglobin Aggregation through Glucosamine-Induced α-Dicarbonyl Formation.
Authors: Hrynets Yuliya, Ndagijimana Maurice, Betti Mirko
Journal: PloS one
Summary
# Editorial Summary: Glucosamine and Myoglobin Glycation in Equine Muscle Muscle protein degradation and cross-linking represent significant concerns in equine nutrition and performance, particularly where supplement use is widespread. Hrynets and colleagues investigated how three different sugars—glucose, N-acetyl-glucosamine, and glucosamine—interact with horse myoglobin (the oxygen-carrying muscle protein), using advanced mass spectrometry and protein characterisation techniques to measure glycation rates, oxidative damage, and structural changes over a 14-day period. Glucosamine proved far more reactive than glucose or N-acetyl-glucosamine, rapidly generating α-dicarbonyl compounds (glucosone and 3-deoxyglucosone) that triggered dramatic conformational shifts within 12 hours, converting the protein's normal helical structure into β-sheet formations characteristic of amyloid fibres. Within three days, myoglobin exposed to glucosamine formed visible protein aggregates—clumps of damaged, cross-linked material that bound to amyloid-specific markers, suggesting permanent structural damage rather than reversible glycation. For equine practitioners, these findings warrant caution regarding glucosamine supplementation, particularly in high doses or prolonged use, as the mechanism identified here could compromise muscle protein quality, contribute to exercise-induced muscle damage, or trigger inflammatory responses that affect performance and recovery.
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Practical Takeaways
- •Glucosamine supplementation may promote rapid protein glycation and formation of potentially harmful amyloid-like aggregates in equine muscle tissue; practitioners should be cautious with long-term supplementation protocols
- •These in vitro findings suggest that accumulated advanced glycation products from glucosamine use could impair muscle protein function and may contribute to muscle-related performance issues or recovery problems
- •Further in vivo research is needed before drawing clinical conclusions, but this data warrants investigation into whether glucosamine supplementation affects equine muscle quality or recovery rates
Key Findings
- •Glucosamine (GlcN) induced myoglobin glycation more rapidly than glucose or N-acetyl-glucosamine, with mass spectrometry confirming fastest reaction kinetics
- •GlcN-induced myoglobin glycation produced high levels of α-dicarbonyl compounds (glucosone 27-332 mg/L, 3-deoxyglucosone 14-304 mg/L) within 3 days
- •Glycated myoglobin underwent structural transformation from native α-helical to 41% β-sheet conformation, forming amyloid-like fibrous aggregates detectable by thioflavin T binding
- •Metmyoglobin reduction and tertiary structural changes were observed as early as 0.5 days of GlcN exposure, suggesting rapid protein modification