8-iso-prostaglandin-F2α: a possible trigger or accelerator of diabetic retinopathy

Associations of plasma 8-iso-prostaglandin F2αlevels with fasting blood glucose (FBG) and intra-abdominal fat (IAF) area in various Glycometabolism populations

BACKGROUND

This study aimed to investigate the differences in oxidative stress (OS) levels represented by 8-iso-prostaglandin F_2α (8-iso-PGF_2α) and analyze its correlation with the intra-abdominal fat (IAF) area and the glycolipid index.

METHODS

We recruited a total of 160 eligible subjects. According to the blood glucose levels and the T2DM duration, subjects were divided into three groups: Type 2 Diabetes (T2DM) group, Prediabetic group, and Normal glucose-tolerance (NC) group, containing 66, 41, 53 patients, respectively. T2DM groups were additionally divided into a new-onset T2DM group including 29 patients and a non-new-onset T2DM group including 37 patients. General clinical data and biochemical indicators were collected. Intra-abdominal fat (IAF) was measured by MRI. 8-iso-PGF_2α was measured by ELISA.

RESULTS

Compared with the NC group, levels of systolic blood pressure (SBP), waist-to-hip ratio (WHR), FBG, 2 h postprandial glycemia(2hPG), 2 h insulin (2 h INS), IAF area, HOMA-IR, and 8-iso-PGF_2α increased, and high-density lipoprotein cholesterol (HDL-C) decreased in T2DM groups and Prediabetic group (P < 0.05). The 2 h INS level was the highest in the Prediabetic group; 2hPG, and IAF area were the highest in the new-onset T2DM group; WHR, FBG, HOMA-IR and 8-iso-PGF_2α were the highest in the non-new-onset T2DM group. Multiple stepwise regression analysis identified IAF area and FBG as the strongest and independent determinant of 8-iso-PGF_2α (P < 0.01).

CONCLUSIONS

In various glycometabolism populations, 8-iso-PGF2α is significantly correlated with FBG and IAF, this suggests that high blood glucose and abdominal obesity can increase the damage related to the OS in vivo.

Association of lipid peroxidation and interleukin-6 with carotid atherosclerosis in type 2 diabetes

Enhanced lipid peroxidation and elevated interleukin-6 levels are common in type 2 diabetes mellitus patients. Atherosclerotic vascular complications greatly contribute to morbidity and mortality in diabetes. The aim of this study was to assess the relation of lipid peroxidation and interleukin-6 with carotid atherosclerosis in type 2 diabetes mellitus.

Methods

This cross-sectional study included 90 type 2 diabetes mellitus male patients with age ≥ 40 years and 30 healthy male subjects matched for age. All of them were subjected to measuring of 8-iso prostaglandin F2α as a marker of lipid peroxidation, interleukin-6 and carotid intima media thickness as a marker of carotid atherosclerosis.

Results

Both 8-iso prostaglandin F2α and interleukin-6 were found to have significant positive correlation with carotid intima media thickness (P < 0.001) and both were found to be significant predictors of the presence of subclinical carotid atherosclerosis in multiple regression analysis.

Conclusion

Lipid peroxidation and interleukin-6 may play an important role in atherogenesis in type 2 diabetes mellitus and limiting their effects may reduce atherosclerotic vascular complications in type 2 diabetes mellitus.