Cited by 200Ion Transport and Channel RegulationAmino Acid Enzymes and MetabolismDrug Transport and Resistance Mechanisms

Heterogeneity of pig intestinal d-glucose transport systems

Halaihel, Nabil, Gerbaud, Daniele, Vasseur, Monique, Alvarado, Francisco·1999·American Journal of Physiology-Cell Physiology

Abstract

Heterogeneity of intestinald-glucose transport is demonstrated using pig jejunal brush-border membrane vesicles in the presence of 100/0 (out/in) mM gradients each of NaCl, NaSCN, and KSCN. Two d-glucose transport systems are kinetically distinguished: high-affinity, low-capacity system 1, which is equivalent to the symporter SGLT1; and low-affinity, high-capacity system 2, which is not a member of the SGLT family but is a d-glucose and d-mannose transporter exhibiting no preference for Na+over K+. A nonsaturabled-glucose uptake component has also been detected; uptake of this component takes place at rates 10 times the rate of components characterizing the classical diffusion marker l-glucose. It is also shown that, in this kinetic work, 1) use of d-glucose-contaminatedd-sorbitol as an osmotic replacement cannot cause the spurious appearance of nonexistent transport systems and 2) a large range (≥50 mM) of substrate concentrations is required to correctly fit substrate saturation curves to distinguish between low-affinity transport systems and physical diffusion.

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Registry

Crossref · 10.1152/ajpcell.1999.277.6.c1130

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Authors
Halaihel, N., Gerbaud, D., Vasseur, M., & Alvarado, F.
Affiliations
Inserm (FR)
Venue
American Journal of Physiology-Cell Physiology
Published
1999-12-01
Volume
277
Issue
6
Pages
C1130-C1141
ISSN
  • 0363-6143 (ISSN-L)
  • 1522-1563
OpenAlex
W2613483351
Cited by
199
References
38
Citations by year
2026: 3 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 1 · 2021: 5 · 2020: 4 · 2019: 9 · 2018: 5 · 2017: 10 · 2016: 5 · 2015: 6 · 2014: 8 · 2013: 5 · 2012: 10
FWCI
1.60
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Cell Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
intestinal glucose transport, SGLT1, brush border membrane vesicles, substrate saturation kinetics, sorbitol
MeSH terms
Animals, Biological Transport, Diffusion, Coloring Agents, Glucose, Intestinal Absorption, Intestinal Mucosa, Intracellular Membranes, Kinetics, Mannose, Membrane Glycoproteins, Monosaccharide Transport Proteins, Osmosis, Sodium Chloride, Sorbitol, Swine, Thiocyanates, Sodium-Glucose Transporter 1

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