Advanced oxidation protein products in obese women: its relation to insulin resistance and resistin

  • H. Koçak
  • Y. Öner-İyidoğan
  • F. Gürdöl
  • P. Öner
  • R. Süzme
  • D. Esin
  • H. İşsever
Original

DOI: 10.1007/s10238-007-0143-x

Cite this article as:
Koçak, H., Öner-İyidoğan, Y., Gürdöl, F. et al. Clin. Exper.Med. (2007) 7: 173. doi:10.1007/s10238-007-0143-x

Abstract

Obesity is a major risk factor for insulin resistance and type 2 diabetes mellitus (T2DM). Resistin, an adipocyte-secreted hormone, is thought to take a part in the development of insulin resistance and T2DM. The aim of this study was to characterise the changes in circulating levels of resistin and proinflammatory cytokines tumour necrosis factor-alpha (TNF-α) and interleukin (IL)-6 in diabetic and prediabetic obese patients and to explore their relationship to insulin resistance. Attempts were also made to see whether resistin levels are related to the degree of oxidative stress, as determined by the measurement of advanced oxidation protein products (AOPPs). The study groups consisted of obese diabetic (BMI: 30–42 kg/m2, n=28) and prediabetic (BMI: 29–41 kg/m2, n=23) women. Fourteen healthy women, with BMI in the range 21.5–25.5 kg/m2, were taken as controls. Serum levels of TNF-a, IL-6, resistin, glucose, insulin and AOPPs were measured. Insulin resistance was calculated by the homeostasis model assessment (HOMA-IR). Diabetic and prediabetic obese patients had increases in serum resistin and TNF-α levels (P<0.01 and P<0.001, respectively). IL-6 levels in diabetic patients were significantly higher than in prediabetics (P<0.05). AOPP levels were also significantly higher in diabetics than prediabetics and controls (P<0.05 and P<0.001, respectively); and positively correlated with blood glucose. Insulin was significantly associated with circulating resistin and TNF-α. The development of insulin resistance may contribute to the elevation of circulating resistin or vice versa. Determination of AOPPs may be helpful for monitoring the impaired glucose metabolism in obesity.

Key words

ResistinCytokineType 2 diabetesInsulin resistanceAOPP

Copyright information

© Springer-Verlag Italia 2007

Authors and Affiliations

  • H. Koçak
    • 1
  • Y. Öner-İyidoğan
    • 2
  • F. Gürdöl
    • 1
  • P. Öner
    • 1
  • R. Süzme
    • 1
  • D. Esin
    • 3
  • H. İşsever
    • 4
  1. 1.Department of Biochemistry, Istanbul Faculty of MedicineIstanbul UniversityÇapaTurkey
  2. 2.Medical Services Training School, Medical Laboratory ProgrammeIstanbul UniversityCerrahpaşaTurkey
  3. 3.Division of Internal DiseasesTaksim Training and Educational HospitalTaksimTurkey
  4. 4.Department of Public Health, Istanbul Faculty of MedicineIstanbul UniversityÇapaTurkey