title: Polyphyllin D induces apoptosis in U87 human glioma cells through the c-Jun NH2-terminal kinase pathway.
abstract: Polyphyllin D (PD), an active component from a traditional medicinal herb Paris polyphylla, which has long been used for the treatment of cancer in Asian countries, has been found to hold significant antitumor activity in vivo or in vitro. However, there were few reports on the effects and underlying mechanism of PD on apoptosis in U87 human glioma cells. The present study was conducted to evaluate apoptotic induction of PD in U87 human glioma cells, and explore its underlying pathway. U87 glioma cells were cultured and treated with varied concentrations of PD (from 10(-8) to 10(-4) M). The inhibition of U87 glioma cell proliferation by PD was assessed by MTT assay. The apoptosis of U87 glioma cells was detected by flow cytometry, and western blot analysis was used to examine human B-cell leukemia/lymphoma 2 (Bcl-2), human Bcl-2 associated X protein (Bax), caspase-3, total-c-jun NH2-terminal kinase (t-JNK), and phosphorylation-JNK (p-JNK) protein expression in U87 human glioma cells. The treatment with PD for 24 h significantly inhibited the proliferation of U87 human glioma cells in a concentration-dependent manner. PD increased apoptosis and significantly upregulated the expression of Bax, caspase-3, and p-JNK associated with apoptosis, but downregulated antiapoptotic Bcl-2 expression in U87 human glioma cells. Our data provided evidences that PD induces apoptosis in U87 human glioma cells. This effect might be associated with the JNK pathway.
authors.affiliation: 1 Department of Neurosurgery, Renmin Hospital of Wuhan University , Wuhan, China .
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yu
authors.forename: Qiaoyu
authors.initials: Q
authors.lastname: Li
authors.forename: Peisong
authors.initials: P
authors.lastname: Lu
authors.forename: Qianxue
authors.initials: Q
authors.lastname: Chen
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D001402:B-Lymphocytes; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004144:Diosgenin / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D005910:Glioma / Q000188:drug therapy* / Q000378:metabolism; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000187:drug effects*; D019684:Magnoliopsida / Q000737:chemistry*; D010766:Phosphorylation; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology* / Q000627:therapeutic use; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D012503:Saponins; D051028:bcl-2-Associated X Protein / Q000378:metabolism
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts; D019253:Proto-Oncogene Proteins c-bcl-2; D012503:Saponins; D051028:bcl-2-Associated X Protein; C121203:polyphyllin D; D048031:JNK Mitogen-Activated Protein Kinases; D053148:Caspase 3; D004144:Diosgenin
keywords: U87 human glioma cells; apoptosis; c-jun NH2-terminal kinase; polyphyllin D