Regulation of morphological and functional properties of astrocytes by hydrogen peroxide

Abstract

Effects of hydrogen peroxide on morphological characteristics, proliferation index, and menadione-dependent lucigenin-enhanced chemiluminescence of C6 glioma cells were studied. It was established that H2O2 at 5 × 10−7−1 × 10−8 M concentrations acted as a regulator of morphological and functional properties of astrocytes, inducing their reactivation, which is manifested as cell body hypertrophy and an increase of proliferative activity and menadione-induced production of superoxide anion radicals (O2•−). Cytodestructive action of hydrogen peroxide at a concentration higher than 1 × 10−6 M on C6 glioma cells shows itself as a decrease of their proliferation index and the ability to generate O2•− under the effect of menadione. Use of lipopolysaccharide B as a functional stimulator has shown that H2O2 modifies signaling pathways leading to an increase of mitotic activity of C6 glioma cells and decreases the yield of lucigenin-dependent chemiluminescence of astrocytes under the action of menadione to the level of control values.