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Changes in the ribonucleic acid metabolism of aging mouse tissues with particular reference to the prostate gland
Abstract:
1. The synthesis of RNA in purified nuclei of tissues from aged mice is substantially diminished. 2. As judged by the recovery of RNA in 105000g supernatants of tissue homogenates, the synthesis of ribosomal RNA may be particularly affected. 3. The decrease in RNA synthesis may be due to changes in the composition of the nuclear-associated protein with age, which result in changes in the priming ability of tissue chromatin. 4. Aging is accompanied by marked changes in the sedimentation profiles of ribonucleoprotein particles. These can be attributed to an age-associated depletion in messenger RNA or to an increased susceptibility to enzymic disaggregation.
Insights
RNA synthesis significantly decreases in aged mice tissues, particularly affecting ribosomal RNA. This decline may stem from age-related changes in nuclear proteins and chromatin, impacting RNA production and stability.
Area of Science:
- Molecular Biology
- Gerontology
- Biochemistry
Background:
- Aging is associated with cellular and molecular alterations.
- RNA synthesis is crucial for cellular function and gene expression.
- Previous studies suggest age-related changes in nucleic acid metabolism.
Purpose of the Study:
- To investigate the impact of aging on RNA synthesis in mouse tissues.
- To identify specific types of RNA synthesis affected by aging.
- To explore the underlying molecular mechanisms contributing to age-related changes in RNA synthesis.
Main Methods:
- Isolation of purified nuclei from aged and young mouse tissues.
- Measurement of RNA synthesis rates in isolated nuclei.
- Analysis of RNA recovery in tissue homogenate supernatants.
- Assessment of nuclear-associated proteins and chromatin priming ability.
- Evaluation of ribonucleoprotein particle sedimentation profiles.
Main Results:
- Substantial diminution of RNA synthesis in purified nuclei from aged mouse tissues.
- Potential particular impact on ribosomal RNA synthesis, indicated by recovery in supernatants.
- Age-associated changes in nuclear-associated proteins may alter chromatin priming ability, contributing to decreased RNA synthesis.
- Marked changes in ribonucleoprotein particle sedimentation profiles in aged tissues.
- These changes may be due to age-associated messenger RNA depletion or increased susceptibility to enzymatic degradation.
Conclusions:
- Aging significantly impairs RNA synthesis in mouse tissues.
- Ribosomal RNA synthesis appears particularly vulnerable to age-related decline.
- Alterations in nuclear protein composition and chromatin structure play a role in reduced RNA synthesis with age.
- Age-associated changes in RNA and ribonucleoprotein particles affect RNA stability and contribute to functional decline.