HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Online-Only Appendix All Versions of this Article: db07-0403v1 57/1/5    most recent Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hofmann, S. M. Articles by Hui, D. Y. Search for Related Content PubMed PubMed Citation Articles by Hofmann, S. M. Articles by Hui, D. Y. Social Bookmarking                What's this?

Defective Lipid Delivery Modulates Glucose Tolerance and Metabolic Response to Diet in Apolipoprotein E–Deficient Mice

¹ Department of Pathology and Laboratory Medicine, Genome Research Institute, University of Cincinnati College of Medicine, Cincinnati, Ohio
² Department of Psychiatry, Genome Research Institute, University of Cincinnati College of Medicine, Cincinnati, Ohio

Address correspondence and reprint requests to David Y. Hui, PhD, Department of Pathology and Laboratory Medicine, Genome Research Institute (ML0507), University of Cincinnati, 2120 E. Galbraith Rd., Cincinnati, OH 45237. E-mail: huidy{at}email.uc.edu

Key Words: apo, apolipoprotein • BAT, brown adipose tissue • FPLC, fast-performance liquid chromatography • ipGTT, intraperitoneal glucose tolerance test • LpL, lipoprotein lipase • oFTT, oral fat tolerance test • SAT, subcutaneous white adipose tissue • TG, triglyceride • TGRL, triglyceride-rich lipoprotein • UCP-1, uncoupling protein-1

OBJECTIVE—Apolipoprotein E (ApoE) regulates plasma lipid levels via modulation of lipolysis and serving as ligand for receptor-mediated clearance of triglyceride (TG)-rich lipoproteins. This study tested the impact of modulating lipid delivery to tissues on insulin responsiveness and diet-induced obesity.

RESEARCH DESIGN AND METHODS—ApoE^+/+ and apoE^–/– mice were placed on high-fat–high-sucrose diabetogenic diet or control diet for 24 weeks. Plasma TG clearance, glucose tolerance, and tissue uptake of dietary fat and glucose were assessed.

RESULTS—Plasma TG clearance and lipid uptake by adipose tissue were impaired, whereas glucose tolerance was improved in control diet–fed apoE^–/– mice compared with apoE^+/+ mice after an oral lipid load. Fat mass was reduced in apoE^–/– mice compared with apoE^+/+ mice under both dietary conditions. The apoE^–/– mice exhibited lower body weight and insulin levels than apoE^+/+ mice when fed the diabetogenic diet. Glucose tolerance and uptake by muscle and brown adipose tissue (BAT) was also improved in mice lacking apoE when fed the diabetogenic diet. Indirect calorimetry studies detected no difference in energy expenditure and respiratory quotient between apoE^+/+ and apoE^–/– mice on control diet. Energy expenditure and uncoupling protein-1 expression in BAT were slightly but not significantly increased in apoE^–/– mice on diabetogenic diet.

CONCLUSIONS—These results demonstrated that decreased lipid delivery to insulin-sensitive tissues improves insulin sensitivity and ameliorates diet-induced obesity.

CiteULike    Del.icio.us    Digg    Reddit    Technorati    What's this?