RESUMO
<p><b>OBJECTIVE</b>To explore the gene expressions of LTC4 synthase homologs in concanavalin A (Con A)-induced mouse hepatitis and regulation role of cyclosporine A (Cs A) treatment.</p><p><b>METHODS</b>Male Balb/c mouse liver injury model was developed by iv injection of Con A (20 mg/kg) and protected by Cs A pretreatment (150 mg/kg) before Con A administration. Blood samples were collected at indicated times after Con A treatment with or without Cs A pretreatment. Liver damage was assessed by serum transaminase ALT and AST measurement and histological evaluation. Meantime, three LTC4 synthase homolog gene expressions were determined by RT-PCR.</p><p><b>RESULTS</b>Serum ALT and AST upregulation were accompanied with histological damage at 2 h after Con A administration, and further aggravated at 8 h. mGST2 gene expression increased 1.7 fold at 2 h and 1.9 fold at 8 h, while the expression of LTC4 S and mGST3 changed little. Pretreatment with Cs A prevented mouse liver from injury by Con A and partly inhibited the mGST2 gene expression upregulation.</p><p><b>CONCLUSIONS</b>Administration of Con A in mouse lead to a significant increase of mGST2 gene expression without any significant effect on LTC4 S and mGST3 mRNA levels. Cs A pretreatment results in protection of liver damage, whereas fails to fully inhibit the increase of mGST2 gene expression.</p>
Assuntos
Animais , Masculino , Camundongos , Alanina Transaminase , Sangue , Aspartato Aminotransferases , Sangue , Doença Hepática Induzida por Substâncias e Drogas , Concanavalina A , Toxicidade , Ciclosporina , Farmacologia , Regulação Enzimológica da Expressão Gênica , Genética , Glutationa Transferase , Genética , Hepatite Animal , Imunossupressores , Farmacologia , Injeções Intravenosas , Isoenzimas , Genética , Camundongos Endogâmicos BALB C , Reação em Cadeia da Polimerase Via Transcriptase ReversaRESUMO
<p><b>OBJECTIVE</b>To investigate the protective effects and mechanism of triterpenoids on primarily cultured rat hepatocytes injured by D-galactosamine (D-GalN) or carbon tetrachloride (CCl4).</p><p><b>METHODS</b>Rat hepatocytes were isolated by two-step collagenase perfusion and cultured in RPMI 1640 medium. Protective effects of asiatic acid (AA) and beta-glycyrrhetinic acid (GA) were evaluated on hepatocytes injured by D-GalN (2 mmol/L) or CCl4 (10 mmol/L). Cell morphology was observed by light microscope, cell viability was measured by MTT assay, AST and LDH were determined by an automatic analyzer. Fluorescence assay was applied to test reactive oxygen species (ROS), nitric oxide end products (NOx) and reduced glutathione (GSH), and JC-1 staining was used to determine mitochondria membrane potential (DeltaPsim).</p><p><b>RESULTS</b>AST and LDH in medium were decreased when treated with AA and GA after D-GalN injury (P<0.05), furthermore AA enhanced the hepatocyte viability (P<0.05). Moreover, AA and GA significantly reduced ROS and NOx generation, and ameliorated DeltaPsim lost induced by D-GalN. AA also inhibited GSH decrease due to D-GalN and CCl4 treatment.</p><p><b>CONCLUSION</b>Both AA and GA could protect hepatocytes from D-GalN and CCl4 injuries, which is associated with reducing intracellular ROS and NOx, reversing GSH depression and ameliorating DeltaPsim lost.</p>