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Effects of starvation on valine and alanine transport across the intestinal mucosal border in sea bass,Dicentrarchus labrax

✍ Scribed by M. Avella; O. Blaise; J. Berhaut

Publisher: Springer-Verlag
Year: 1992
Tongue: English
Weight: 957 KB
Volume: 162
Category: Article
ISSN: 0174-1578
DOI: 10.1007/bf00258965

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✦ Synopsis

Kinetics of intestinal transport of L-alanine and L-valine (substrates of the A-system and the L-system, respectively, in mammals) across the brush-border membrane in sea bass, Dicentrarchus labrax, were studied on intact mucosa using a short-term uptake technique. When fish were starved for 4-8 weeks, total influx (mucosa-to-cell) of valine fell owing to disappearance or modification of the diffusion component. The maximum influx rate of saturable component increased but its affinity (reflected by the Michaelis constant) decreased. Alanine transport by Na(+)-dependent and diffusion pathways was unchanged after starvation. Fasting also induced an almost 20% decrease in the length of intestinal microvilli.

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