title: Effect of intensive insulin treatment on plasma levels of lipoprotein-associated phospholipase A2and secretory phospholipase A2in patients with newly diagnosed type 2 diabetes.
abstract: BACKGROUND
  China has the highest absolute disease burden of diabetes worldwide. For diabetic patients, diabetes-related vascular complications are major causes of morbidity and mortality. The roles of lipoprotein-associated phospholipase A2(Lp-PLA2) and secretory phospholipase A2(sPLA2) as inflammatory markers have been recently evaluated in the pathogenesis of both diabetes and atherosclerosis. We aimed to determine the mechanism through which patients with newly diagnosed type 2 diabetes gain long-term vascular benefit from intensive insulin therapy by evaluating the change in Lp-PLA2and sPLA2levels after early intensive insulin treatment and its relevance with insulin resistance and pancreatic β-cell function.
  
  
  METHODS
  In total, 90 patients with newly diagnosed type 2 diabetes mellitus were enrolled. All patients received continuous subcutaneous insulin infusion (CSII) for approximately 2 weeks. Intravenous glucose-tolerance test (IVGTT) and oral glucose-tolerance test (OGTT) were performed, and plasma concentrations of Lp-PLA2and sPLA2were measured before and after CSII.
  
  
  RESULTS
  Levels of Lp-PLA2and sPLA2were significantly higher in diabetic patients with macroangiopathy than in those without (P < 0.05). After CSII, the sPLA2level decreased significantly in all diabetic patients (P < 0.05), while the Lp-PLA2 level changed only in those with macroangiopathy (P < 0.05). The area under the curve of insulin in IVGTT and OGTT, the acute insulin response (AIR3-5), early phase of insulin secretion (ΔIns30/ΔG30), modified β-cell function index, and homeostatic model assessment for β-cell function (HOMA-β) increased after treatment even when adjusted for the influence of insulin resistance (IR; P < 0.001). The HOMA-IR was lower after treatment, and the three other indicators adopted to estimate insulin sensitivity (ISIced, IAI, and QUICKI) were higher after treatment (P < 0.05). Correlation analysis showed that the decrease in the Lp-PLA2and sPLA2levels was positively correlated with a reduction in HOMA-IR after CSII (P < 0.05). Additionally, multiple linear regression analysis showed that Lp-PLA2and sPLA2independently correlated with HOMA-IR (P < 0.05).
  
  
  CONCLUSIONS
  Lp-PLA2and sPLA2are closely related to insulin resistance and macroangiopathy in diabetic patients. Intensive insulin therapy might help improve IR and protect against diabetic macroangiopathy by influencing the Lp-PLA2and sPLA2levels.
  
  
  BACKGROUND
  ChiCTR-TRC-10001618 2010 September 16.
authors.affiliation: Department of Clinical Nutrition, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Xiu-Hong
authors.initials: XH
authors.lastname: Lin
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China. xumtong@126.com.
authors.forename: Ming-Tong
authors.initials: MT
authors.lastname: Xu
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Jv-Ying
authors.initials: JY
authors.lastname: Tang
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Li-Fang
authors.initials: LF
authors.lastname: Mai
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Xiao-Yi
authors.initials: XY
authors.lastname: Wang
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Meng
authors.initials: M
authors.lastname: Ren
authors.affiliation: Department of Endocrinology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Yan
mesh_terms: D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase / Q000097:blood / Q000187:drug effects*; D000328:Adult; D002681:China; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000188:drug therapy*; D003925:Diabetic Angiopathies; D005260:Female; D006801:Humans; D055104:Infusions, Subcutaneous; D007328:Insulin / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged
chemical_list: D007328:Insulin; D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase
keywords: Atherosclerosis; Intensive insulin treatment; Lp-PLA2; Type 2 diabetes, newly diagnosed; sPLA2