Fatty Acid- and Cholesterol Transporter Protein Expression Along the Human Intestinal Tract

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2010 May 11

PMID 20454462

Citations 18

Authors

Christiaan J Masson

Jogchum Plat

Ronald P Mensink

Andrzej Namiot

Wojciech Kisielewski

Zbigniew Namiot

Joachim Fullekrug

Robert Ehehalt

Jan F C Glatz

Maurice M A L Pelsers

Affiliations

Soon will be listed here.

Abstract

Background: Protein distribution profiles along the human intestinal tract of transporters involved in the absorption of cholesterol and long-chain fatty acids (LCFA) have been scarcely evaluated.

Methodology/principal Findings: In post-mortem samples from 11 subjects, intestinal transporter distribution profiles were determined via Western Blot. Differences in transporter protein levels were statistically tested using ANOVA and Tukey's Post Hoc comparisons. Levels in all segments were expressed relative to those in duodenum. Except for ABCG5 and FATP4, levels (mean+/-SEM) were the highest in the ileum. For ABCA1, ileal levels (1.80+/-0.26) differed significantly from those in duodenum (P = 0.049) and proximal colon (0.92+/-0.14; P = 0.029). ABCG8 levels in ileum (1.91+/-0.30) differed from those in duodenum (P = 0.041) and distal colon (0.84+/-0.22; P = 0.010) and jejunum (1.64+/-0.26) tended to be higher than distal colon (0.84+/-0.22; P = 0.087). Ileal NPC1L1 levels (2.56+/-0.51) differed from duodenum levels (P = 0.019) and from distal colon (1.09+/-0.22; P = 0.030). There was also a trend (P = 0.098) for higher jejunal (2.23+/-0.37) than duodenal NPC1L1 levels. The levels of ABCG5 did not correlate with those of ABCG8. FAT/CD36 levels in ileum (2.03+/-0.42) differed from those in duodenum (P = 0.017), and proximal and distal colon (0.89+/-0.13 and 0.97+/-0.15 respectively; P = 0.011 and P = 0.014). FABPpm levels in ileum (1.04+/-0.13) differed from proximal (0.64+/-0.07; P = 0.026) and distal colon (0.66+/-0.09; P = 0.037).

Conclusions/significance: The distribution profiles showed a bell-shape pattern along the GI-tract with the highest levels in ileum for ABCA1, ABCG8, NPC1L1, FATCD36 and FABPm, suggesting a prominent role for ileum in transporter-mediated uptake of cholesterol and LCFAs.

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