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Deprivation of dietary nucleotides results in a transient decrease in acid-soluble nucleotides and RNA concentration
A T López-Navarro1, A Gil, A Sánchez-Pozo
1Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, University of Granada, Spain.
The Journal of Nutrition
|August 1, 1995
Summary
Dietary nucleotides are essential for maintaining liver nucleotide pools in rats. A nucleotide-free diet significantly impacts hepatic nucleotide metabolism and RNA levels, highlighting the importance of dietary nucleotide availability.
Area of Science:
- Biochemistry
- Nutritional Science
- Hepatology
Background:
- Nucleotides are fundamental building blocks for DNA and RNA.
- The liver plays a crucial role in nucleotide metabolism.
- Dietary sources of nucleotides can influence endogenous synthesis and tissue pools.
Purpose of the Study:
- To investigate the impact of dietary nucleotide supplementation on liver nucleotide concentrations in rats.
- To determine if a nucleotide-free diet affects hepatic nucleotide pools and RNA levels.
- To assess the adaptability of hepatic nucleotide metabolism to dietary nucleotide availability.
Main Methods:
- Two groups of rats were fed either a nucleotide-supplemented or a nucleotide-free diet for three weeks.
- Liver acid-soluble nucleotides (ATP, ADP, GTP, CDP), DNA, and RNA concentrations were measured weekly.
- Comparative analysis between the two dietary groups and over time within each group was performed.
Main Results:
- Rats on a nucleotide-free diet showed significantly lower concentrations of ATP, ADP, GTP, CDP, and RNA after one week compared to the supplemented group.
- These lower concentrations persisted at week two, except for ATP and ADP.
- By week three, rats on the nucleotide-free diet exhibited increased nucleotide and RNA levels, reaching those of the supplemented group.
Conclusions:
- Dietary nucleotides contribute to maintaining hepatic nucleotide pools in rats.
- Diets lacking nucleotides negatively affect liver nucleotide metabolism and RNA synthesis.
- Liver nucleotide metabolism is demonstrably modulated by the availability of nucleotides in the diet.