Hao Chen1, Xingqi Wang2, Qiuchen Zhao3, Zuohui Zhang1, Xinchun Ye1, Fang Hua1, Guiyun Cui1. 1. a Department of Neurology , Affiliated Hospital of Xuzhou Medical College , Xuzhou, Jiangsu Province , P.R. China . 2. b School of Life Science , Nanjing , Jiangsu Province , P.R. China , and. 3. c Medical School, Nanjing University , Nanjing , Jiangsu Province , P.R. China.
Abstract
PRIMARY OBJECTIVE: The purpose of this study was to investigate the effects of heme oxygenase-1 (HO-1) on astrocyte injury induced by hemin. RESEARCH DESIGN: Primary astrocytes were isolated from Sprague Dawley rat pups and cultured in vitro. The expression of HO-1 was induced by hemin in a quantitative fashion and the effects of HO-1 on hemin-induced astrocyte injury were estimated by cell viability, cell membrane permeability and apoptosis. METHODS AND PROCEDURES: Astrocytes were divided into control group, hemin 5 μM group, hemin 5 μM + Zn-PPIX group, hemin 30 μM group and hemin 30 μM + Zn-PPIX group. Survival quality of astrocyte was measured by WST-8 assay, LDH assay, Hoechst 33258 Staining and annexin V-FITC/PI assay and apoptotic-related proteins were measured using Western blotting. MAIN OUTCOME AND RESULTS: Hemin could dose-dependently up-regulate the expression of HO-1. HO-1 exerted a protective role on astrocyte damage induced by 5 μM hemin, including increased cell survival rate and anti-apoptotic proteins expression (Bcl-2 and p-AKT), as well as decreased LDH release, apoptosis ratio and apoptotic protein expression (Bax, p-ERK and cleaved-caspase3). However, the effect of HO-1 on astrocyte injury between 30 μM hemin-treated groups was opposite of the protective role in 5 μM hemin-treated groups. CONCLUSIONS: There were dual effects of HO-1 in 5 μM and 30 μM hemin-induced astrocyte injuries.
PRIMARY OBJECTIVE: The purpose of this study was to investigate the effects of heme oxygenase-1 (HO-1) on astrocyte injury induced by hemin. RESEARCH DESIGN: Primary astrocytes were isolated from Sprague Dawley rat pups and cultured in vitro. The expression of HO-1 was induced by hemin in a quantitative fashion and the effects of HO-1 on hemin-induced astrocyte injury were estimated by cell viability, cell membrane permeability and apoptosis. METHODS AND PROCEDURES: Astrocytes were divided into control group, hemin 5 μM group, hemin 5 μM + Zn-PPIX group, hemin 30 μM group and hemin 30 μM + Zn-PPIX group. Survival quality of astrocyte was measured by WST-8 assay, LDH assay, Hoechst 33258 Staining and annexin V-FITC/PI assay and apoptotic-related proteins were measured using Western blotting. MAIN OUTCOME AND RESULTS:Hemin could dose-dependently up-regulate the expression of HO-1. HO-1 exerted a protective role on astrocyte damage induced by 5 μM hemin, including increased cell survival rate and anti-apoptotic proteins expression (Bcl-2 and p-AKT), as well as decreased LDH release, apoptosis ratio and apoptotic protein expression (Bax, p-ERK and cleaved-caspase3). However, the effect of HO-1 on astrocyte injury between 30 μM hemin-treated groups was opposite of the protective role in 5 μM hemin-treated groups. CONCLUSIONS: There were dual effects of HO-1 in 5 μM and 30 μM hemin-induced astrocyte injuries.