Increased high-density lipoprotein cholesterol predicts the pioglitazone-mediated reduction of carotid intima-media thickness progression in patients with type 2 diabetes mellitus

Circulation. 2008 Apr 22;117(16):2123-30. doi: 10.1161/CIRCULATIONAHA.107.746610. Epub 2008 Apr 14.

Abstract

Background: Measurement of carotid intima-media thickness (CIMT) has been validated as a measure of atherosclerosis and as a predictor of future cardiovascular events. Compared with glimepiride, pioglitazone has been shown to slow the progression of atherosclerosis measured by CIMT in patients with type 2 diabetes mellitus.

Methods and results: We evaluated individual cardiovascular risk factors as predictors of the change in CIMT produced by pioglitazone treatment by determining whether their addition to a baseline model resulted in loss of significance for the treatment effect on CIMT. Pioglitazone treatment led to improvement in levels of multiple cardiovascular risk markers, including high-sensitivity C-reactive protein, apolipoprotein B, apolipoprotein A1, high-density lipoprotein (HDL) cholesterol, triglyceride, insulin, and free fatty acid. At 24 weeks, there were significant differences in HDL cholesterol, triglyceride, total cholesterol, low-density lipoprotein cholesterol, insulin, body mass index, hip circumference, and high-sensitivity C-reactive protein between the pioglitazone and glimepiride treatment groups. After adjustment for 24-week on-treatment values of cardiovascular risk factors, only inclusion of the changes in HDL cholesterol and insulin significantly impacted the magnitude and significance of the treatment effect on CIMT. Furthermore, irrespective of treatment assignment, increased HDL cholesterol at 24 weeks was a significant predictor of reduced CIMT progression at 72 weeks.

Conclusions: The beneficial effect of pioglitazone on HDL cholesterol at 24 weeks predicted its beneficial effect for reducing CIMT progression at 72 weeks. Changes in HDL cholesterol at 24 weeks, irrespective of treatment, predicted less progression of CIMT at 72 weeks. These results suggest that suppression of atherosclerosis with pioglitazone therapy is linked to its ability to raise HDL cholesterol.

Trial registration: ClinicalTrials.gov NCT00225264.

Publication types

  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Carotid Arteries / pathology
  • Carotid Artery Diseases / complications
  • Carotid Artery Diseases / drug therapy*
  • Carotid Artery Diseases / epidemiology
  • Cholesterol, HDL / blood*
  • Diabetes Mellitus, Type 2 / complications
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Diabetes Mellitus, Type 2 / epidemiology
  • Disease Progression
  • Female
  • Humans
  • Hypoglycemic Agents / therapeutic use*
  • Male
  • Middle Aged
  • Pioglitazone
  • Predictive Value of Tests
  • Risk Factors
  • Sulfonylurea Compounds / therapeutic use
  • Thiazolidinediones / therapeutic use*
  • Tunica Intima / pathology
  • Tunica Media / pathology

Substances

  • Cholesterol, HDL
  • Hypoglycemic Agents
  • Sulfonylurea Compounds
  • Thiazolidinediones
  • glimepiride
  • Pioglitazone

Associated data

  • ClinicalTrials.gov/NCT00225264