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Journal of Diabetes Research
Volume 2016, Article ID 3684831, 6 pages
http://dx.doi.org/10.1155/2016/3684831
Research Article

Ectopic Fat Deposition on Insulin Sensitivity: Correlation of Hepatocellular Lipid Content and M Value

1Department of Endocrinology and Diabetes Center, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
2Department of Hematology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
3Department of Endocrinology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China

Received 7 February 2016; Revised 8 June 2016; Accepted 30 June 2016

Academic Editor: Brunella Capaldo

Copyright © 2016 Beverly S. Hong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. This study aimed to explore the relationship among insulin sensitivity and ectopic fat depots in participants with different glucose status. Methods. Fifty-nine men and women were enrolled in this study: 29 with normal glucose tolerance (NGT), 17 with impaired glucose tolerance (IGT), and 13 with type 2 diabetes mellitus (T2DM). All participants underwent a hyperinsulinemic-euglycemic clamp to assess the insulin sensitivity index ( value) and magnetic resonance imaging to measure the hepatocellular lipid content (HCL), skeletal muscle fat content including intramyocellular lipid (IMCL) and extramyocellular lipid (EMCL) of tibialis anterior (ta), and soleus muscle (sol). Results. The value of NGT group was higher than those of IGT and T2DM groups (). Participants with T2DM had the highest HCL and IMCL (ta) compared with those in NGT and IGT groups (). The value had an inverse relationship with HCL (, ), IMCL (sol) (, ), and IMCL (ta) (, ). Stepwise linear regression analysis showed that HCL (standardized ; ) had an independent relationship with value. Conclusions. Hepatocellular lipid content deposition happens earlier than skeletal muscle fat deposition. HCL is an independent risk factor for insulin resistance and may be used to evaluate the risk of developing T2DM as a noninvasive marker of insulin sensitivity index.