Duration of feeding on a sucrose-rich diet determines metabolic and morphological changes in rat adipocytes

Duration of feeding on a sucrose-rich diet determines metabolic and morphological changes in rat... Abstract In this work, we studied the effect of a short-term (3 wk) and a long-term (15 wk) administration of a sucrose-rich diet (SRD) to Wistar rats on the morphological aspects and metabolic function of the epididymal adipose tissue that may contribute to the mechanism underlying the impaired glucose homeostasis and insulin resistance. The present work showed the following. 1 ) There was both a moderate increase of basal lipolysis and a decrease of the antilipolytic action of insulin in the adipocytes of rats fed a SRD for 3 wk. Neither size alterations nor increases in adipose tissue mass were recorded in this period. 2 ) There was a significant ( P < 0.05) increase of epididymal weight after 15 wk on a SRD as well as a hypertrophy of adipocytes with a clear alteration in the cell size distribution. This was accompanied by a significant increase ( P < 0.05) of basal and stimulated lipolysis and a marked decrease ( P < 0.05) of the antilipolytic action of insulin. Moreover, these changes appear together with a worsening of both impaired glucose homeostasis and insulin resistance. Our results also indicate that the length of time on the SRD plays an important role in the evolution of the adiposity and metabolic changes observed in the fat pad. Furthermore, the latter precedes the detection of adiposity. adipose tissue dyslipidemia glucose intolerance insulin resistance Footnotes Address for reprint requests and other correspondence: Y. B. Lombardo. Dept. of Biochemistry, Univ. of Litoral, Ciudad Universitaria Paraje El Pozo, CC 242, 3000 Santa Fe, Argentina. (E-mail: ylombard@fbcb.unl.edu.ar ). The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked “ advertisement ” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. Copyright © 2001 the American Physiological Society http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

Duration of feeding on a sucrose-rich diet determines metabolic and morphological changes in rat adipocytes

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Publisher
The American Physiological Society
Copyright
Copyright © 2011 the American Physiological Society
ISSN
8750-7587
eISSN
1522-1601
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Abstract

Abstract In this work, we studied the effect of a short-term (3 wk) and a long-term (15 wk) administration of a sucrose-rich diet (SRD) to Wistar rats on the morphological aspects and metabolic function of the epididymal adipose tissue that may contribute to the mechanism underlying the impaired glucose homeostasis and insulin resistance. The present work showed the following. 1 ) There was both a moderate increase of basal lipolysis and a decrease of the antilipolytic action of insulin in the adipocytes of rats fed a SRD for 3 wk. Neither size alterations nor increases in adipose tissue mass were recorded in this period. 2 ) There was a significant ( P < 0.05) increase of epididymal weight after 15 wk on a SRD as well as a hypertrophy of adipocytes with a clear alteration in the cell size distribution. This was accompanied by a significant increase ( P < 0.05) of basal and stimulated lipolysis and a marked decrease ( P < 0.05) of the antilipolytic action of insulin. Moreover, these changes appear together with a worsening of both impaired glucose homeostasis and insulin resistance. Our results also indicate that the length of time on the SRD plays an important role in the evolution of the adiposity and metabolic changes observed in the fat pad. Furthermore, the latter precedes the detection of adiposity. adipose tissue dyslipidemia glucose intolerance insulin resistance Footnotes Address for reprint requests and other correspondence: Y. B. Lombardo. Dept. of Biochemistry, Univ. of Litoral, Ciudad Universitaria Paraje El Pozo, CC 242, 3000 Santa Fe, Argentina. (E-mail: ylombard@fbcb.unl.edu.ar ). The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked “ advertisement ” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. Copyright © 2001 the American Physiological Society

Journal

Journal of Applied PhysiologyThe American Physiological Society

Published: Nov 1, 2001

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