Oxidative stress is associated with adiposity and insulin resistance in men.
To investigate the direct relationship of oxidative stress with obesity and insulin resistance in men, we measured the plasma levels of 8-epi-prostaglandin F2alpha (PGF2alpha) in 14 obese and 17 nonobese men and evaluated their relationship with body mass index; body fat weight; visceral, sc, and total fat areas, measured by computed tomography; and glucose infusion rate during a euglycemic hyperinsulinemic clamp study. Obese men had significantly higher plasma concentrations of 8-epi-PGF2alpha than nonobese men (P < 0.05). The plasma levels of 8-epi-PGF2alpha were significantly correlated with body mass index (r = 0.408; P < 0.05), body fat weight (r = 0.467; P < 0.05), visceral (r = 0.387; P < 0.05) and total fat area (r = 0.359; P < 0.05) in all (obese and nonobese) men. There was also a significant correlation between the plasma levels of 8-epi-PGF2alpha and glucose infusion rate in obese men (r = -0.552; P < 0.05) and all men (r = -0.668; P < 0.01). In all subjects, the plasma levels of 8-epi-PGF2alpha were significantly correlated with fasting serum levels of insulin (r = 0.487; P < 0.01). In brief, these findings showed that the circulating levels of 8-epi-PGF2alpha are related to adiposity and insulin resistance in men. Although correlation does not prove causation, the results of this study suggest that obesity is an important factor for enhanced oxidative stress and that this oxidative stress triggers the development of insulin resistance in men.
Urakawa
Hideki
H
Third Department of Internal Medicine, Mie University School of Medicine, Mie, 514-8507 Japan.
Katsuki
Akira
A
Sumida
Yasuhiro
Y
Gabazza
Esteban C
EC
Murashima
Shuichi
S
Morioka
Kohei
K
Maruyama
Noriko
N
Kitagawa
Nagako
N
Tanaka
Takashi
T
Hori
Yasuko
Y
Nakatani
Kaname
K
Yano
Yutaka
Y
Adachi
Yukihiko
Y
D000273:Adipose Tissue / Q000378:metabolism*; D000328:Adult; D002784:Cholesterol / Q000097:blood; D015237:Dinoprost / Q000031:analogs & derivatives*; D028441:F2-Isoprostanes / Q000097:blood*; D006801:Humans; D007333:Insulin Resistance; D008297:Male; D009765:Obesity / Q000097:blood*; D018384:Oxidative Stress
D028441:F2-Isoprostanes; C075750:8-epi-prostaglandin F2alpha; D002784:Cholesterol; D015237:Dinoprost