title: Protective effect of (-)clausenamide against Abeta-induced neurotoxicity in differentiated PC12 cells.
abstract: The neurotoxicity of aggregated beta-amyloid (Abeta) has been implicated as a critical cause in the pathogenesis of Alzheimer's disease (AD). In the present study, we investigated the effect of (-)clausenamide ((-)Clau), an aqueous extract of leaves of Clausena lassium (lour) skeel, on the neurotoxicity of Abeta(25-35). The viability of differentiated PC12 cells was determined by MTT assay. Apoptosis was detected by flow cytometry. DCFH-DA was used for assessment of intracellular ROS generation, JC-1 and Rhodamine 123 for measurement of mitochondrial transmembrane potential (MMP). The intracellular calcium was determined with Fluo-3. The phosphorylation of p38 MAPK and the expression of Bcl-2, Bax, P53, Caspase 3 were examined by Western blot. The results showed that (-)Clau significantly elevated cell viability. Furthermore, (-)Clau arrested the apoptotic cascade by reversing overload of calcium, preventing ROS generation, moderated the dissipation of MMP and the misbalance of Bcl-2 and Bax, inhibiting the activation of p38 MAPK and the expression of P53 and cleaved Caspase 3. Our results suggested that (-)Clau may be a therapeutic agent for AD.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization, Ministry of Education, Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Xiannongtan street, Xuanwu district, Beijing 100050, China.
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Hu
authors.forename: Shi-Feng
authors.initials: SF
authors.lastname: Chu
authors.forename: Na
authors.initials: N
authors.lastname: Ning
authors.forename: Yu-He
authors.initials: YH
authors.lastname: Yuan
authors.forename: Wei
authors.initials: W
authors.lastname: Xue
authors.forename: Nai-Hong
authors.initials: NH
authors.lastname: Chen
authors.forename: Jun-Tian
authors.initials: JT
authors.lastname: Zhang
mesh_terms: D016229:Amyloid beta-Peptides / Q000494:pharmacology*; D000704:Analysis of Variance; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D002118:Calcium / Q000378:metabolism; D053148:Caspase 3 / Q000378:metabolism; D002454:Cell Differentiation; D007769:Lactams / Q000494:pharmacology*; D017705:Lignans / Q000494:pharmacology*; D016716:PC12 Cells; D010766:Phosphorylation / Q000187:drug effects; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D051381:Rats; D015398:Signal Transduction / Q000187:drug effects; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D051028:bcl-2-Associated X Protein / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D016229:Amyloid beta-Peptides; D007769:Lactams; D017705:Lignans; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D051028:bcl-2-Associated X Protein; C053048:clausenamide; D048051:p38 Mitogen-Activated Protein Kinases; D053148:Caspase 3; D002118:Calcium