title: [Insulin resistance and islet beta cell function in type 2 diabetes mellitus and non alcoholic fatty liver disease.].
abstract: OBJECTIVE
  To investigate insulin resistance and islet beta cell function in type 2 diabetes mellitus (T2DM) and non alcoholic fatty liver disease (NAFLD).
  
  
  METHODS
  Two hundred and six study subjects were classified into 4 groups. Hepatic insulin resistance index (HIR), HOMA insulin resistance index (HOMA-IR) and Matsuda index (MSI) were used to assess insulin resistance. HOMA-beta, early and late phase indexes of insulin secretion were used to evaluate islet beta cell function.
  
  
  RESULTS
  HIR in the NAFLD group and T2DM with NAFLD group were significantly higher than that in the control group and T2DM group (4.13 +/- 0.64, 4.03 +/- 0.69 vs 3.52 +/- 0.78, 3.53 +/- 0.64, P < 0.05), HOMA-IR in the T2DM with NAFLD group was significantly higher than that in the NAFLD group and T2DM group (3.35 +/- 2.69 vs 2.31 +/- 1.39, 2.40 +/- 1.55, P < 0.05). Early phase insulin secretion index in the NAFLD group was lower than that in the control group significantly (2.13 +/- 0.17 vs 2.61 +/- 0.13, P < 0.05), but there was no significant difference of HOMA-beta and late phase insulin secretion index between the NAFLD group and control group, HOMA-beta, early and late phase indexes of insulin secretion in the T2DM group and T2DM with NAFLD group were significantly lower than those in the control group.
  
  
  CONCLUSIONS
  Normal glucose tolerance NAFLD patients may present with insulin resistance, mainly hepatic insulin resistance. Islet beta cell function in the NAFLD patients show damage of early phase insulin secretion. Newly diagnosed T2DM with or without NAFLD patients generally present with insulin resistance, early and later phase insulin secretion dysfunction. Insulin resistance in patients with T2DM and NAFLD is more severe.
authors.affiliation: Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou 510120, China. Email: Amiy36@hotmail.com.
authors.forename: Fang-Ping
authors.initials: FP
authors.lastname: Li
authors.forename: Si-Qing
authors.initials: SQ
authors.lastname: Zhang
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Yin-Qiong
authors.initials: YQ
authors.lastname: Huang
authors.forename: Zu-Zhi
authors.initials: ZZ
authors.lastname: Fu
authors.forename: Li
authors.initials: L
authors.lastname: Yan
mesh_terms: D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism; D006801:Humans; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance; D000078790:Insulin Secretion; D050417:Insulin-Secreting Cells / Q000378:metabolism; D065626:Non-alcoholic Fatty Liver Disease / Q000378:metabolism
chemical_list: D007328:Insulin