We investigated the phenotypic level of albumin in peripheral blood mononuclear
cells (PBMC) of streptozotocin (STZ)-induced diabetic rats. A specific reduction of
albumin was identified by 2-dimensional electrophoresis and mass spectrometry. Decreased
albumin content was also confirmed by immunoblotting and quantitative real-time PCR. Since
albumin is a major and predominant antioxidant in plasma, the PBMC albumin may also
contribute to their antioxidant activity. By measuring the amount of
H2O2, lipid peroxidation and the redox form of glutathione, it was
found that the production of the oxidative stress was elevated in STZ-diabetic rats
compared to that of normal control. We suggest, therefore, that decreased albumin content
may lead to the decreased antioxidant activity in the PBMC of type 1 diabetic rats.