Elevated plasma immunoreactive neuropeptide Y concentrations and its increased urinary excretion in patients with advanced diabetic nephropathy

Endocr J. 1999 Feb;46(1):139-46. doi: 10.1507/endocrj.46.139.

Abstract

Neuropeptide Y (NPY) is a potent vasoconstrictor peptide that is abundant in the brain and the peripheral sympathetic nervous system. In the present study we investigated possible changes in plasma immunoreactive (IR)-NPY concentrations and urinary IR-NPY excretion in patients with non-insulin dependent diabetes mellitus (NIDDM) and the relationship to diabetic complications, such as nephropathy and neuropathy. IR-NPY in plasma and urine was measured by radioimmunoassay in 69 patients with NIDDM. Plasma IR-NPY concentrations in patients with advanced nephropathy (creatinine clearance <30 ml/min) (100.5 +/- 10.3 pmol/l, n=9, mean +/- SEM) were higher than in the control subjects (55.0 +/- 6.8 pmol/l, n=15) (P<0.02). Urinary excretion of IR-NPY and fractional excretion of NPY were also increased in the patients with advanced nephropathy. Sephadex G-50 column chromatography of the urine extracts obtained from healthy subjects, diabetic patients with renal failure and non-diabetic patients with renal failure showed an immunoreactive peak eluting in the NPY position. On the other hand, neither plasma nor urinary IR-NPY was high in patients with retinopathy, or in patients with peripheral neuropathy. The present study has, for the first time, shown high plasma IR-NPY concentrations and urinary IR-NPY excretion in NIDDM patients with advanced nephropathy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Blood Glucose / analysis
  • Diabetes Mellitus, Type 2 / blood*
  • Diabetes Mellitus, Type 2 / urine*
  • Diabetic Nephropathies / blood*
  • Diabetic Nephropathies / urine*
  • Diabetic Neuropathies / blood
  • Diabetic Neuropathies / urine
  • Diabetic Retinopathy / blood
  • Diabetic Retinopathy / urine
  • Female
  • Glycated Hemoglobin A / analysis
  • Humans
  • Male
  • Middle Aged
  • Neuropeptide Y / blood*
  • Neuropeptide Y / urine*
  • Reference Values

Substances

  • Blood Glucose
  • Glycated Hemoglobin A
  • Neuropeptide Y