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Effect of age and diet on cyclic nucleotide concentrations in the intestinal mucosa of developing rats
Insights
Intestinal cyclic nucleotide concentrations, including cyclic AMP and cyclic GMP, change significantly after birth and during starvation. Diet composition also impacts these levels in infant rat jejunal mucosa.
Area of Science:
- Gastroenterology
- Molecular Biology
- Developmental Physiology
Background:
- Cyclic nucleotides play crucial roles in cellular signaling pathways.
- Understanding their regulation in the developing intestine is vital for pediatric research.
Purpose of the Study:
- To investigate the developmental changes in cyclic nucleotide concentrations in infant rat intestinal mucosa.
- To examine the effects of starvation and diet on these concentrations.
Main Methods:
- Measurement of cyclic AMP and cyclic GMP concentrations in jejunal mucosa and intestinal wall of infant rats.
- Comparison of nucleotide levels in fed versus starved animals.
- Analysis of effects of high carbohydrate versus high fat diets.
Main Results:
- Infant rat jejunal mucosa shows lower cyclic nucleotide concentrations than the intestinal wall.
- Significant increases in cyclic AMP and cyclic GMP occur in the first 5 days postpartum, with another rise between days 15-21.
- Starvation reduces cyclic nucleotide levels, particularly in younger rats and for cyclic AMP.
- High carbohydrate diets lead to greater elevations in cyclic nucleotides compared to high fat diets.
Conclusions:
- Cyclic nucleotide concentrations in rat jejunal mucosa are dynamically regulated during early development.
- Nutritional status, including starvation and diet composition, significantly influences these signaling molecules.
- Findings provide insights into the physiological regulation of the developing gastrointestinal tract.
Abstract:
Mucosa isolated from the proximal third of the small intestine of infant rats had much lower cyclic nucleotide concentrations (expressed both per unit wet weight and per unit DNA content) than those determined in the intestinal wall. The steady-state concentrations of both cyclic AMP and cyclic GMP in jejunum showed dramatic increases during the first 5 d post partum. Another increase in cyclic nucleotide concentrations was observed in the isolated mucosa between d 15 and 21. Starvation for 24 h always resulted in lower intestinal cyclic nucleotide concentrations than those of the fed littermates. This effect was more pronounced in younger animals and more evident for cyclic AMP values. Three-week-old rats fed a high carbohydrate diet for 24-48 h exhibited more pronounced elevations in the concentrations of cyclic nucleotides from the jejunal mucosa than did rats fed a high fat diet.