GATA4 is Essential for Jejunal Function in Mice

Overview

Journal Gastroenterology

Specialty Gastroenterology

Date 2008 Sep 25

PMID 18812176

Citations 57

Authors

Michele A Battle

Benjamin J Bondow

Moriah A Iverson

Scott J Adams

Ronald J Jandacek

Patrick Tso

Stephen A Duncan

Affiliations

Soon will be listed here.

Abstract

Background & Aims: Although the zinc-finger transcription factor GATA4 has been implicated in regulating jejunal gene expression, the contribution of GATA4 in controlling jejunal physiology has not been addressed.

Methods: We generated mice in which the Gata4 gene was specifically deleted in the small intestinal epithelium. Measurements of plasma cholesterol and phospholipids, intestinal absorption of dietary fat and cholesterol, and gene expression were performed on these animals.

Results: Mice lacking GATA4 in the intestine displayed a dramatic block in their ability to absorb cholesterol and dietary fat. Comparison of the global gene expression profiles of control jejunum, control ileum, and GATA4 null jejunum by gene array analysis revealed that GATA4 null jejunum lost expression of 53% of the jejunal-specific gene set and gained expression of 47% of the set of genes unique to the ileum. These alterations in gene expression included a decrease in messenger RNAs (mRNAs) encoding lipid and cholesterol transporters as well as an increase in mRNAs encoding proteins involved in bile acid absorption.

Conclusions: Our data demonstrate that GATA4 is essential for jejunal function including fat and cholesterol absorption and confirm that GATA4 plays a pivotal role in determining jejunal vs ileal identity.

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