We developed ICT-EIA for sIRα and measured urinary sIRα from 106 healthy volunteers, 35 obese volunteers and 42 patients with diabetes.
The detection limit of ICT-EIA (0.04 pg/mL), using a urine sample of as little as 100 μL, was a few hundred-fold higher than that of conventional ELISA. Using ICT-EIA, the urinary sIRα level in patients with diabetes (9.7 ± 20.1 pg/mg creatinine) was significantly higher than those in healthy volunteers (1.4 ± 0.9; P < 0.001).
ICT-EIA for sIRα may be useful as a good marker for evaluating diabetes risk.