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Nutrient absorption.

Shadab A. Siddiqi1, N. Suresh Kumar, David F. Nutting

  • 1Department of Medicine, Division of Gastroenterology and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA.

Current Opinion in Gastroenterology
|February 27, 2001
PubMed
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Nutrient absorption mechanisms advanced, revealing lipid transport rate limits and carbohydrate malabsorption causes. Research also explored vitamin C transporters and iron regulation by DMT1.

Area of Science:

  • Gastroenterology and Nutrition Science
  • Molecular and Cellular Biology
  • Biochemistry

Background:

  • Nutrient absorption is crucial for health, with complex regulatory mechanisms.
  • Understanding these processes is key to addressing malabsorption disorders and metabolic diseases.

Purpose of the Study:

  • To elucidate novel mechanisms and regulatory pathways in nutrient absorption.
  • To investigate the roles of specific transporters and enzymes in intestinal nutrient handling.

Main Methods:

  • Utilized mouse models with targeted gene disruption (adenosine triphosphate-binding cassette transporter).
  • Employed cell culture (CaCo-2 cells) and human enterocyte studies.
  • Investigated enzyme function in sucrase-isomaltase deficiency and modified insulin for oral delivery.

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Main Results:

  • Identified prechylomicron transport as a rate-limiting step in triacylglycerol absorption.
  • Demonstrated a mouse model for Tangier disease and intestinal high-density lipoprotein assembly.
  • Discovered carbohydrate malabsorption due to enzyme secretion in sucrase-isomaltase deficiency.
  • Showcased enhanced oral hypoglycemic activity of glycosylated insulin.
  • Characterized active and inactive variants of the human sodium-dependent vitamin C transporter (hSVCT1).
  • Highlighted the role of divalent metal ion transporter 1 (DMT1) in iron absorption and hepatic transport in rats.

Conclusions:

  • Significant advances were made in understanding nutrient absorption regulation.
  • New insights into lipid, carbohydrate, vitamin C, and iron absorption mechanisms were gained.
  • These findings provide a basis for future therapeutic strategies for malabsorption and metabolic disorders.