Effect of troglitazone on urinary albumin excretion and serum type IV collagen concentrations in Type 2 diabetic patients with microalbuminuria or macroalbuminuria

Diabet Med. 2001 Apr;18(4):308-13. doi: 10.1046/j.1464-5491.2001.00463.x.


Aims: Troglitazone, a newly developed thiazolidinedione derivative, has been shown to ameliorate microalbuminuria in diabetic animal model and in human diabetic nephropathy in short-term studies. The aim of the present study was to determine whether troglitazone or sulphonylurea affect micro- albuminuria, macroalbuminuria, or serum type IV collagen concentrations in patients with diabetic nephropathy.

Methods: We studied 32 normotensive patients with type 2 diabetes mellitus associated with microalbuminuria (n = 16) or macroalbuminuria (n = 16) and 20 healthy controls. The patients were randomly assigned to one of two groups: those treated with glibenclamide (5.0 mg/day) (n = 8) and those treated with troglitazone (400 mg/day) (n = 8). They received the drug regimen for 12 months. Serum type IV collagen was measured with sandwich enzyme immunoassay.

Results: Type IV collagen concentrations in macroalbuminuric patients were higher than those in microalbuminuric patients (P < 0.05) and healthy controls (P < 0.01). Troglitazone reduced urinary albumin excretion (UAE) in micro-albuminuric patients from 126 microg/min (range 58--180 microg/min) to 42 microg/min (range 14--80 microg/min) (P < 0.01) and also reduced serum type IV collagen levels gradually at 3, 6 and 12 months after treatment (P < 0.05). However, glibenclamide did not affect UAE and type IV collagen levels in micro- albuminuric diabetes patients. In addition, neither troglitazone nor gliben- clamide changed UAE and type IV collagen levels in macroalbuminuric patients.

Conclusions: These data suggest that troglitazone is an effective treatment for renal injury in patients with early diabetic nephropathy.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Albuminuria*
  • Animals
  • Blood Pressure
  • Chromans / therapeutic use*
  • Collagen / blood*
  • Creatinine / blood
  • Diabetes Mellitus, Type 2 / blood
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Diabetes Mellitus, Type 2 / urine
  • Diabetic Nephropathies / blood
  • Diabetic Nephropathies / urine
  • Female
  • Glyburide / therapeutic use
  • Glycated Hemoglobin A / analysis
  • Humans
  • Hypoglycemic Agents / therapeutic use*
  • Male
  • Middle Aged
  • Reference Values
  • Thiazoles / therapeutic use*
  • Thiazolidinediones*
  • Troglitazone


  • Chromans
  • Glycated Hemoglobin A
  • Hypoglycemic Agents
  • Thiazoles
  • Thiazolidinediones
  • Collagen
  • Creatinine
  • Troglitazone
  • Glyburide