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Metabolomic Changes in the Rat Eye Lens During the Cataract Onset
Olga A Snytnikova1, Anton A Smolentsev1, Nataliya G Kolosova2
1International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090 Novosibirsk, Russia.
Molecules (Basel, Switzerland)
|June 26, 2026
Summary
Senescence-accelerated OXYS rats show early metabolic shifts in the eye lens, with initial amino acid excess followed by energy depletion, preceding cataract formation. These biochemical changes indicate an early "point of no return" in cataractogenesis.
Area of Science:
- Biochemistry
- Ophthalmology
- Metabolomics
Background:
- Senescence-accelerated OXYS rats serve as a model for studying age-related eye diseases.
- Cataracts are a leading cause of vision impairment, driven by complex biochemical processes.
- Understanding early metabolic changes is crucial for identifying therapeutic targets.
Purpose of the Study:
- To characterize metabolomic differences in the eye lens of OXYS rats versus Wistar rats.
- To identify biochemical shifts linked to genotype, age, and cataract progression.
- To explore the early metabolic events preceding cataract development.
Main Methods:
- Quantitative 1H NMR spectroscopy was used to analyze lens metabolites.
- Metabolomic profiles were compared between OXYS and Wistar rats at 3.6 and 4.5 months of age.
- Cataract severity was clinically graded to correlate with metabolic data.
Main Results:
- At 3.6 months, OXYS rat lenses showed accumulation of 17 metabolites, mainly amino acids.
- By 4.5 months, OXYS lenses exhibited decreased amino acids, glucose, NAD, and hypotaurine.
- Cataract grade had minimal impact on the overall metabolomic profile.
Conclusions:
- Metabolic reorganization, including amino acid imbalance and energy depletion, precedes cataract morphology in OXYS rats.
- A biochemical "point of no return" likely occurs early in cataractogenesis.
- Lens opacification is a consequence of established metabolic disturbances.
