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Tissue levels of S-adenosylmethionine in aging rats
Abstract:
The tissue levels of S-Adenosylmethionine (SAMe) in 30-mo.-old rats were measured, and a remarkable decrease was observed compared to adult rats. The synthesis of SAMe by the methionine-activating enzyme and its utilization by COMT were investigated in different tissues. The activity of the synthesizing enzyme was unchanged in the liver and brain of adult and senescent rats, while COMT activity appeared to be higher in the aging rats. Thus, the result indicates that the decrease of same in these organs of senescent rats is due to the increased utilization rather than the decreased synthesis of this methyl donor compound.
Insights
Tissue levels of S-Adenosylmethionine (SAMe) significantly decrease in aging rats. This reduction is due to increased utilization by COMT, not reduced synthesis, highlighting SAMe
Area of Science:
- Biochemistry
- Gerontology
- Molecular Biology
Background:
- S-Adenosylmethionine (SAMe) is a crucial methyl donor involved in numerous biochemical reactions.
- Age-related changes in SAMe levels and metabolism are not fully understood.
- Previous studies suggest potential alterations in SAMe pathways during aging.
Purpose of the Study:
- To investigate the changes in tissue S-Adenosylmethionine (SAMe) levels in senescent rats.
- To determine whether decreased SAMe synthesis or increased SAMe utilization contributes to lower SAMe levels in aging.
- To examine the activity of SAMe-synthesizing enzyme and COMT in adult versus senescent rats.
Main Methods:
- Measurement of tissue SAMe levels in 30-month-old rats and adult control rats.
- Assay of methionine-activating enzyme activity (SAMe synthesis) in liver and brain.
- Assessment of COMT activity in various tissues of adult and senescent rats.
Main Results:
- A significant decrease in tissue SAMe levels was observed in senescent rats compared to adult rats.
- Methionine-activating enzyme activity remained unchanged in the liver and brain of both age groups.
- COMT activity was found to be higher in the aging rats.
Conclusions:
- The observed decrease in SAMe levels in senescent rats is primarily attributed to enhanced utilization.
- Increased COMT activity in aging rats leads to greater consumption of SAMe.
- These findings suggest that altered SAMe metabolism, specifically increased utilization, is a feature of aging in rats.