Refeeding after a fast in rats: effects on small intestinal enzymes

Area of Science:

• Physiology
• Biochemistry
• Gastroenterology

Background:

• Starvation leads to intestinal atrophy, impacting nutrient absorption.
• Refeeding initiates recovery processes in the gastrointestinal tract.
• Understanding enzyme dynamics during refeeding is crucial for metabolic adaptation.

Purpose of the Study:

• To investigate the impact of refeeding on specific rat intestinal enzyme activities post-starvation.
• To correlate changes in enzyme activity with physiological recovery, such as weight gain.

Main Methods:

• Rats were subjected to a starvation period followed by refeeding.
• Specific activities of key intestinal enzymes (e.g., sucrase, maltase, hexokinase) were measured.
• Body weight and food intake were monitored to assess physiological changes.

Main Results:

• Refeeding rapidly reversed starvation-induced intestinal atrophy.
• Specific activities of sucrase, maltase, and galactokinase decreased with fasting but increased significantly upon refeeding.
• Hexokinase, pyruvate kinase, and thymidine kinase activities were unaffected by fasting but showed an 'overshoot' during refeeding.

Conclusions:

• Refeeding triggers a significant adaptive response in rat intestinal enzyme activities.
• The observed 'overshoot' in enzyme activity likely contributes to accelerated weight gain during recovery.
• These enzymatic adaptations are integral to the overall physiological recovery from fasting.