Metabolism of Circulating Disaccharides in Man and the Rat

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1967 Apr 1

PMID 6021203

Citations 27

Authors

E Weser

M H Sleisenger

Affiliations

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Abstract

The metabolism of circulating disaccharides was studied in adult humans and rats. After iv infusions of 10 g of either lactose, sucrose, or maltose in four adults, no rise in blood glucose was noted. A mean of 8.7+/-1.89 g of the lactose and 6.3+/-1.39 g of the sucrose was excreted in the 24-hour urine sample. Only 0.11+/-0.03 g of the infused maltose was recovered in the urine, suggesting that the maltose was metabolized.After injection of (14)C-labeled lactose and sucrose in rats, 6.2+/-2.7 and 7.6+/-2.4%, respectively, was oxidized to (14)CO(2) in 24 hours; 62.1+/-13.5 and 68.4+/-10.8% of the respective disaccharides was excreted into the urine. Conversely, after injection of (14)C-labeled maltose 54.6+/-7.0% was oxidized to (14)CO(2) and 4.8+/-3.9% excreted in the urine. The per cent of maltose oxidized to CO(2) was similar to that of glucose. In addition to small intestinal mucosa, homogenates of rat kidney, brain, and liver as well as serum were found to have measurable maltase activities. The role of these tissue maltases in the metabolism of circulating maltose and maltosyloligosaccharides is discussed.

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