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Diabetes 53:1271-1278, 2004
© 2004 by the American Diabetes Association, Inc.

Effects of Dietary Monosaccharides on Sympathetic Nervous System Activity in Adipose Tissues of Male Rats

James B. Young, Jeffrey Weiss, and Nadine Boufath

From the Department of Medicine, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois

Dietary carbohydrate activates the sympathetic nervous system (SNS). As the mechanisms underlying this response are not fully characterized, studies were undertaken to compare SNS responses to ingestion of glucose, fructose, and galactose. SNS activity was examined using techniques of [3H]norepinephrine ([3H]NE) turnover in brown and white fat. In addition, gene expression for several sympathetically related proteins was also analyzed in these tissues. [3H]NE turnover in interscapular brown adipose tissue (IBAT) and retroperitoneal fat increased in response to glucose and fructose in the diet, whereas [3H]NE turnover in epididymal fat did not respond to either monosaccharide. Galactose feeding, by contrast, decreased [3H]NE turnover in IBAT, but increased it in epididymal, though not retroperitoneal, fat. Expression of GLUT4 was more abundant in IBAT and retroperitoneal fat from glucose- and fructose-fed animals than from diet- or galactose-fed rats. Chemical sympathectomy abolished the GLUT4 response in retroperitoneal fat, but was without effect on GLUT4 in epididymal fat. These studies are consistent with activation of a neural pathway by oral glucose or fructose, leading to SNS activation in IBAT and retroperitoneal fat and enhanced GLUT4 expression.

Address correspondence and reprint requests to Dr. James B. Young, Northwestern University, Chicago Ward 4-161, 303 East Chicago Ave., Chicago, IL 60611-3008. E-mail: jbyoung{at}northwestern.edu


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Copyright © 2004 by the American Diabetes Association.