Relationship between markers of endothelial dysfunction, oxidant injury and tubular damage in patients with insulin-dependent diabetes mellitus

Clin Sci (Lond). 1993 Nov;85(5):557-62. doi: 10.1042/cs0850557.

Abstract

1. Diabetic nephropathy is a serious microvascular complication in patients with insulin-dependent diabetes mellitus, resulting in end-stage renal disease in 30-45% of such patients. Despite intensive investigation, the pathophysiology of diabetic renal disease has not been fully elucidated. However, several clinical and experimental studies have suggested that endothelial dysfunction and free-radical activity may be important factors. 2. Forty normotensive patients with insulin-dependent diabetes mellitus of between 10 and 20 years duration with persistent normoalbuminuria (albumin excretion < 30 mg/day) and normal renal function were investigated for markers of endothelial dysfunction (plasma von Willebrand factor, soluble thrombomodulin and angiotensin-converting enzyme activity), free oxygen radical generation (erythrocytic superoxide dismutase and glutathione peroxidase) and oxidant injury (serum malondialdehyde). Glomerular proteinuria (albuminuria, transferrinuria), tubular proteinuria (retinol-binding protein) and tubular enzymuria (N-acetyl glucosaminidase and leucine aminopeptidase) were also measured. 3. Patients were divided into two groups. Group 1 comprised 21 patients with elevated markers of endothelial dysfunction, and group 2 comprised 19 patients with normal levels of plasma von Willebrand factor, soluble thrombomodulin and angiotensin-converting enzyme activity. Thirty-eight healthy subjects matched for age and sex acted as controls. 4. Groups 1 and 2 were similar in age, sex, body weight, duration of diabetes mellitus and recent glycaemic control. Serum cholesterol, serum creatinine and glomerular proteinuria were similar in the three groups. Group 1 patients had significantly increased oxidant injury, tubular enzymuria and proteinuria compared with group 2 patients and control subjects (P < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

MeSH terms

  • Adult
  • Albuminuria / urine
  • Cholesterol / blood
  • Creatinine / blood
  • Diabetes Mellitus, Type 1 / metabolism
  • Diabetes Mellitus, Type 1 / physiopathology*
  • Diabetic Nephropathies / metabolism
  • Diabetic Nephropathies / physiopathology*
  • Endothelium / metabolism
  • Endothelium / physiopathology*
  • Erythrocytes / metabolism
  • Female
  • Free Radicals
  • Humans
  • Kidney Glomerulus / metabolism
  • Kidney Tubules / metabolism
  • Male
  • Middle Aged
  • Oxygen / metabolism

Substances

  • Free Radicals
  • Cholesterol
  • Creatinine
  • Oxygen