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Am J Physiol Gastrointest Liver Physiol 293: G519-G524, 2007. First published May 10, 2007; doi:10.1152/ajpgi.00189.2007
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THEMES

Development and Physiological Regulation of Intestinal Lipid Absorption. I. Development of intestinal lipid absorption: cellular events in chylomicron assembly and secretion

Dennis D. Black

Children's Foundation Research Center of Memphis, Le Bonheur Children's Medical Center, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee

Submitted 30 April 2007 ; accepted in final form 7 May 2007

The newborn mammal must efficiently absorb dietary fat, predominantly as triacylglycerol, and produce chylomicrons to deliver this lipid to peripheral tissues. The cellular mechanisms involved in enterocyte chylomicron assembly have recently been elucidated, and data on their regulation in the immature gut are beginning to emerge. This review focuses on key proteins involved in chylomicron assembly: apolipoprotein B-48, microsomal triglyceride transfer protein, and apolipoproten A-IV. Recent studies support a role for apolipoprotein A-IV in enhancing chylomicron secretion by promoting production of larger particles. These proteins are regulated in a manner to maximize the lipid absorptive capacity of the newborn intestine.

apolipoprotein A-IV; apolipoprotein B-48; microsomal triglyceride transfer protein; newborn; small intestine



Address for reprint requests and other correspondence: D. D. Black, Children's Foundation Research Center of Memphis, Le Bonheur Children's Medical Center, Rm. 401, W. Patient Tower, 50 N. Dunlap St., Memphis, TN 38103 (e-mail: dblack{at}utmem.edu)




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