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Ribosomal RNA in Alzheimer's disease and aging

S L Payão1, M A Smith, L M Winter

  • 1Departamento de Morfologia, Disciplina de Genética, UNIFESP Escola Paulista de Medicina, São Paulo, Brazil.

Mechanisms of Ageing and Development
|December 23, 1998
PubMed
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Ribosomal RNA (rRNA) levels decrease with aging, particularly in Alzheimer's disease (AD) patients. This study suggests changes in rRNA production or degradation may be linked to AD and aging processes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Ribosomal RNA (rRNA) genes are crucial for protein synthesis and gene expression.
  • Previous research indicated reduced ribosomal gene activity in Alzheimer's disease (AD).

Purpose of the Study:

  • To investigate the ratio of mature 28S and 18S ribosomal RNA (rRNA) in peripheral blood samples from individuals with Alzheimer's disease (AD) and various control groups.
  • To explore potential age-related changes and AD-specific alterations in rRNA levels.

Main Methods:

  • Analysis of mature 28S and 18S rRNA ratios in peripheral blood samples.
  • Comparison between Alzheimer's disease patients (AD), healthy elderly sisters (SA), healthy elderly controls (EC), and healthy young controls (YC).

Main Results:

  • A statistically significant decrease in the 28S/18S rRNA ratio was observed in elderly groups (AD, SA, EC) compared to young controls (YC).
  • The Alzheimer's disease patient group exhibited the lowest 28S/18S rRNA ratio.
  • Results suggest potential rRNA 28S subunit fragmentation or degradation with aging.

Conclusions:

  • Aging is associated with a reduced 28S/18S rRNA ratio, possibly due to 28S rRNA fragmentation.
  • Alzheimer's disease patients show the most significant decrease in this ratio, suggesting potential alterations in rRNA transcription, maturation, or degradation processes.