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Ascorbate in the rat lens: dependence on dietary intake
Vino C Mody1, Manoj Kakar, Ase Elfving
1St. Erik's Eye Hospital, and Department of Physiology and Pharmacology, Division of Pharmacology, Karolinska Institutet, Stockholm, Sweden. vino.mody@ste.ki.se
Ophthalmic Research
|May 4, 2005
Summary
This study developed a method to measure ascorbate in rat lenses and found that lens ascorbate concentration increases linearly with dietary intake, without causing cataracts.
Area of Science:
- Biochemistry
- Ophthalmology
- Nutritional Science
Background:
- Ascorbate (vitamin C) is crucial for ocular health.
- Understanding ascorbate levels in the lens is important for eye health research.
- Previous methods for measuring lens ascorbate were limited.
Purpose of the Study:
- To establish a reliable method for quantifying whole-lens ascorbate.
- To determine the relationship between dietary ascorbate intake and lens ascorbate concentration in rats.
Main Methods:
- Rats were fed diets with varying L-ascorbate concentrations (0-114 mmol/kg) for 4 weeks.
- Lenses were extracted, weighed, and homogenized.
- Ascorbate was measured using High-Performance Liquid Chromatography (HPLC).
- Polynomial regression analysis was used to assess the dose-response relationship.
Main Results:
- A baseline lens ascorbate concentration of 0.16+/-0.01 micromol/g wet weight was estimated.
- Lens ascorbate concentration increased linearly with dietary ascorbate intake.
- No cataracts were observed in any of the experimental groups.
Conclusions:
- The developed HPLC method is effective for measuring whole-lens ascorbate.
- Dietary ascorbate intake directly and linearly influences lens ascorbate concentration in rats.
- Maintaining adequate dietary ascorbate is important for lens health.