Abstract
The synthesis of various types of ribonucleic acid (RNA)isolated from 6- to 30-month-old female Fischer F344 rats was compared. The rate of RNA synthesis by freshly prepared hepatocytes was determined by dividing the amount of [3H]orotic acid incorporated into RNA as uridine-5'-monophosphate by the specific activity of the uridine-5'-triphosphate pool. The rate of total RNA synthesis by hepatocytes from 19-month-old rats was 40% less than the rate for hepatocytes from 12-month-old rats. No significant difference in the rate of total RNA synthesis was observed between 19 and 30 months of age. The percentage of [3H]orotic acid incorporated into poly(A)+RNA by 30-month-old rats was approximately 50% less than that observed for hepatocytes isolated from 6-month-old rats. The percentage of [3H]orotic acid incorporated into poly(A)-RNA as ribosomal RNA (38S, 18S, and 5S RNAs) or transfer RNA was similar for 12- and 30-month-old rats. The rate of poly(A)+RNA synthesis by hepatocytes isolated from 30-month-old rats was 65% less than that observed for hepatocytes from 6-month-old rats. In contrast to total RNA synthesis, the rate of poly(A)+RNA synthesis for the 30-month-old rats was significantly less than the rate for 19-month-old rats.
Original language | English (US) |
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Pages (from-to) | 666-672 |
Number of pages | 7 |
Journal | Unknown Journal |
Volume | 37 |
Issue number | 6 |
DOIs | |
State | Published - Jan 1 1982 |
ASJC Scopus subject areas
- Aging