Electron paramagnetic resonance decay constant and oxidative stresses in liver microsomes of the selenium-deficient rat.

The free radical-reducing activity and the membrane fluidity of liver microsomes from selenium-deficient (SeD) rats were examined by means of electron paramagnetic resonance (EPR) spin label method using nitroxyl-labeled stearic acids. Our findings show that the membrane fluidity and lipid peroxidation levels in SeD rat liver microsome were relatively unchanged compared with normal rat. In contrast, SeD caused the induction of liver microsomal cytochrome P-450 activity.