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Epithelial cell proliferation and intestinal absorptive function during starvation and refeeding in the rat
R A Goodlad1, J A Plumb, N A Wright
1Department of Histopathology, Royal Postgraduate Medical School, Hammersmith Hospital, London.
Clinical Science (London, England : 1979)
|March 1, 1988
Summary
Starvation reduces intestinal absorption and cell production. Refeeding initially boosts absorption via faster enterocyte maturation, not cell production, before absorption declines.
Area of Science:
- Gastroenterology
- Cell Biology
- Physiology
Background:
- Intestinal epithelial cells are crucial for nutrient absorption.
- Cell turnover and maturation are key to maintaining intestinal function.
- Nutritional status significantly impacts intestinal physiology.
Purpose of the Study:
- To investigate the effects of starvation and refeeding on intestinal epithelial cell production and absorption in rats.
- To elucidate the mechanisms behind the rapid increase in absorption following refeeding.
- To understand the relationship between crypt cell production rate (CCPR) and absorptive function recovery.
Main Methods:
- Measurements of intestinal epithelial cell production and intestinal absorption in rats under fed, starved, and refed conditions.
- Assessment of crypt cell production rate (CCPR), absorption rates, small intestinal length, and crypt cell population.
- Analysis of changes over time following refeeding (1 day, 2 days, 1 week).
Main Results:
- Four days of starvation significantly decreased CCPR, absorption, intestinal length, and crypt cell population.
- Refeeding led to an immediate increase in absorption within 1 day, preceding a slower rise in CCPR.
- While CCPR eventually normalized and overshot control levels, absorption decreased significantly below control levels after 1 week.
- No immediate change in crypt cell population post-refeeding suggested accelerated enterocyte maturation or migration as the cause of initial absorption increase.
Conclusions:
- The initial surge in intestinal absorption after refeeding is primarily driven by accelerated enterocyte maturation or migration, not increased cell production.
- The recovery of absorptive function is a biphasic process, with rapid functional adaptation preceding the slower restoration of cell production.
- Sustained high absorptive function recovery requires increased crypt cell production to repopulate the villi.