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Aging and vitamin E deficiency are responsible for altered RNA pathways
Manuela Malatesta1, Carlo Bertoni-Freddari, Patrizia Fattoretti
1Istituto di Istologia e Analisi di Laboratorio, University of Urbino Carlo Bo, Urbino, Italy.
Annals of the New York Academy of Sciences
|July 13, 2004
Summary
Aging and vitamin E deficiency alter nucleolar structure and RNA processing factors. These changes highlight the role of free radicals and oxidative stress in the aging process.
Area of Science:
- Cell Biology
- Aging Research
- Nutritional Science
Background:
- Nucleoli are crucial for ribosome biogenesis and cellular function.
- Aging and nutritional deficiencies, like vitamin E deficiency, can impact cellular structures and processes.
- Understanding these impacts is vital for comprehending age-related decline and the role of antioxidants.
Purpose of the Study:
- To quantitatively assess the effects of aging and vitamin E deficiency on nucleolar components (fibrillar centers, dense fibrillar components, granular components) and perichromatin granules.
- To evaluate the impact of aging and vitamin E deficiency on key RNA transcription and splicing factors.
- To explore the relationship between oxidative stress, vitamin E, and age-related cellular changes.
Main Methods:
- Morphometric analysis of nucleolar components (FCs, DFC, GC) and perichromatin granules (PGs) in rat models.
- Quantitative evaluation of immunolabeled transcription factors (RNA polymerase II, fibrillarin) and splicing factors (SC-35, snRNPs).
- Comparison of cellular and molecular markers between adult, old, and vitamin E-deficient rats.
Main Results:
- Aging and vitamin E deficiency led to decreased fibrillar center size and nucleolar surface fraction.
- Vitamin E deficiency significantly increased granular components and decreased dense fibrillar components in nucleoli.
- Perichromatin granule density increased with aging but decreased with vitamin E deficiency.
- Levels of RNA polymerase II and SC-35 decreased in both aging and vitamin E deficiency.
- Fibrillarin and snRNPs remained unchanged with aging but decreased significantly in vitamin E deficiency.
Conclusions:
- Both aging and vitamin E deficiency significantly alter nucleolar structure and RNA processing pathways.
- The findings support the critical role of free radical production and control, mediated by antioxidants like vitamin E, in the aging process.
- These cellular changes underscore the impact of nutritional status and oxidative stress on cellular health during aging.