The effect of aging on the structure and function of liver messenger RNA

M. C. Birchenall-Sparks, M. S. Roberts, M. S. Rutherford, A. Richardson

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The size of the poly(A) segment of poly(A)+RNA extracted from hepatocytes isolated from 4- to 30-month-old rats was determined using polyacrylamide-agarose gel electrophoresis. The average size of the poly(A) segment isolated from newly synthesized poly(A)+RNA was 150 nucleotides, and the average size of the poly(A) segment isolated from the steady state pool of cytoplasmic poly(A)+RNA was 70 nucleotides. No significant age related change in either the size or the heterogeneity of the newly synthesized poly(A) segment was found. The translational activity of poly(A)+RNA isolated from livers of 4- to 30-month-old rats was determined using wheat germ extract and rabbit reticulocyte lysate cell-free systems. No age-related change in the translational activity of the poly(A)+RNA was observed. The effect of aging on the cap structure was also studied by measuring the inhibition of cell-free translation by 7-methyl guanosine-5′-monophosphate. No age-related change in the sensitivity of the poly(A)+RNA preparations to inhibition of translation by 7-methyl guanosine-5′-monophosphate was observed. Therefore, the results of this study demonstrate that no major age-related change occurs in the structure of the poly(A) segment, the translational activity, or the cap structure of poly(A)+RNA from rat liver.

Original languageEnglish (US)
Pages (from-to)99-111
Number of pages13
JournalMechanisms of Ageing and Development
Volume32
Issue number1
DOIs
StatePublished - Oct 14 1985
Externally publishedYes

Keywords

  • Cap structure
  • Liver
  • Messenger RNA
  • Poly(A) segment
  • Protein synthesis
  • Translation

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