Postprandial chylomicrons and adipose tissue lipoprotein lipase are altered in type 2 diabetes independently of obesity and whole-body insulin resistance

Giovanni Annuzzi, Rosalba Giacco, Lidia Patti, Lucrezia Di Marino, Claudia De Natale, Giuseppina Costabile, Maurizio Marra, Carmela Santangelo, Roberta Masella, Angela A. Rivellese

Research output: Contribution to journalArticlepeer-review

Abstract

Background and aims: Postprandial lipoprotein abnormalities in type 2 diabetes are associated with insulin resistance. The role of other diabetes-related factors is still not clear. The aim of this study is to differentiate the effects of whole-body insulin resistance, obesity, and type 2 diabetes on postprandial dyslipidaemia and lipoprotein lipase (LPL) in adipose tissue. Methods and results: Ten subjects with obesity and diabetes (OD), 11 with obesity alone (O), and 11 normal-weight controls (C) - males, aged 26-59 years, with fasting normo-triglyceridaemia underwent measurements of cholesterol, triglycerides, apo B-48 and apo B-100 concentrations in plasma lipoproteins separated by density gradient ultracentrifugation before and after a fat-rich meal. Fasting and postprandial (6 h) LPL activity was determined in abdominal subcutaneous adipose tissue biopsy samples. Insulin sensitivity was measured by hyperinsulinaemic euglycaemic clamp. OD and O subjects had similar degrees of adiposity (BMI, waist circumference, fat mass) and insulin resistance (insulin stimulated glucose disposal and M/I). They also showed a similarly higher postprandial increase in large VLDL lipids (triglyceride incremental AUC 188 ± 28 and 135 ± 22 mg/dl·6 h) than C (87 ± 13 mg/dl·6 h, M ± SEM, p <0.05). OD had an increased chylomicron response compared to O (triglyceride incremental AUC 132 ± 23 vs. 75 ± 14 mg/dl·6 h, p <0.05). OD had significantly lower fasting and postprandial adipose tissue heparin-releasable LPL activity than O and C. Conclusions: In insulin-resistant conditions of obesity, with and without diabetes, large VLDL are increased after a fat-rich meal. In addition, diabetic patients compared to obese subjects have an increased postprandial chylomicron response and a reduced adipose tissue LPL activity.

Original languageEnglish
Pages (from-to)531-538
Number of pages8
JournalNutrition, Metabolism and Cardiovascular Diseases
Volume18
Issue number8
DOIs
Publication statusPublished - Oct 2008

Keywords

  • Adipose tissue
  • Insulin resistance
  • Lipoprotein lipase
  • Postprandial lipoproteins
  • Type 2 diabetes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

Fingerprint Dive into the research topics of 'Postprandial chylomicrons and adipose tissue lipoprotein lipase are altered in type 2 diabetes independently of obesity and whole-body insulin resistance'. Together they form a unique fingerprint.

Cite this