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Hypervitaminosis E and gametogenesis in Caenorhabditis elegans
P Goldstein1, E McCann-Hargrove, L Magnano
1Department of Biological Sciences, University of Texas, El Paso 79968.
Cytobios
|January 1, 1993
Summary
Vitamin E acetate (VEA) is toxic and does not increase lifespan because it is slowly converted to vitamin E. VEA accumulation causes nuclear damage, reduced vitality, and reproductive issues in nematodes.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Vitamin E (d,l-alpha-tocopherol) is known for its antioxidant properties and benefits to lifespan and vitality.
- Vitamin E acetate (VEA) is a derivative often used for vitamin E supplementation.
Purpose of the Study:
- To investigate why vitamin E acetate (VEA) does not confer the expected benefits of vitamin E.
- To elucidate the toxic mechanisms of VEA accumulation in biological tissues.
Main Methods:
- Nematode model system used to study the effects of VEA.
- Analysis of nuclear morphology, lifespan, progeny production, and reproductive parameters.
- Investigation of VEA's impact on cellular membranes and chromosomal structures.
Main Results:
- VEA is poorly converted to vitamin E in tissues, leading to its toxic accumulation.
- VEA exposure caused nuclear aberrations, decreased lifespan, reduced progeny, and impaired vitality.
- VEA incorporation into membranes induced allosteric changes, inhibiting telomere attachment to the nuclear envelope.
- Disruption of reproductive strategies, including the rare presence of synaptonemal complexes in oocytes, correlated with decreased progeny and chromosomal aberrations.
Conclusions:
- The slow conversion of VEA to vitamin E leads to its toxic accumulation and detrimental effects.
- VEA disrupts nuclear structure, cellular processes, and reproductive capabilities, causing hypervitaminosis E symptoms.