title: Combination gene therapy with PTEN and EGFR siRNA suppresses U251 malignant glioma cell growth in vitro and in vivo.
abstract: The over-expression/amplification of the epidermal growth factor receptor (EGFR) gene and mutation/deletion of tumor suppressor PTEN gene are main genetic changes identified in glioblastomas. These two genetic changes play a critical role in the formation of many malignant tumors and have been shown to be the important therapeutic targets. In this study, we used an expression plasmid that expresses small hairpin RNA-targeting sequences of human EGFR and wild-type PTEN cDNA to examine the growth inhibitive effects in U251 glioma cells. It was found that down-regulation of EGFR expression and up-regulation of PTEN expression resulted in the suppression of cell proliferation, arrest of cell cycle, reduction in cell invasion and promotion of cell apoptosis in vitro. In addition, the growth of the subcutaneous U251 glioma in the nude mice treated with expression plasmid was significantly inhibited. Our results demonstrated that the expression plasmid could exert proliferation and invasion inhibition effects on U251 cells in vitro and in vivo. It suggested that combinatory gene therapy targeting EGFR and PTEN would be a new strategy in gene therapy of glioblastoma.
authors.affiliation: Department of Neurosurgery, Tianjin Neurological Institute, Tianjin Medical University General Hospital and Lab of Neuro-oncology, 154 An-Shan Road, Heping District, 300052, Tianjin, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Han
authors.forename: An-ling
authors.initials: AL
authors.lastname: Zhang
authors.forename: Peng
authors.initials: P
authors.lastname: Xu
authors.forename: Xiao
authors.initials: X
authors.lastname: Yue
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Guang-xiu
authors.initials: GX
authors.lastname: Wang
authors.forename: Zhi-fan
authors.initials: ZF
authors.lastname: Jia
authors.forename: Pei-yu
authors.initials: PY
authors.lastname: Pu
authors.forename: Chun-sheng
authors.initials: CS
authors.lastname: Kang
mesh_terms: D000818:Animals; D017209:Apoptosis; D001483:Base Sequence; D045744:Cell Line, Tumor / Q000187:drug effects; D018076:DNA, Complementary / Q000235:genetics; D066246:ErbB Receptors / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D018390:Gene Targeting; D018773:Genes, erbB-1; D015316:Genetic Therapy; D005909:Glioblastoma / Q000473:pathology / Q000628:therapy*; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D008969:Molecular Sequence Data; D009361:Neoplasm Invasiveness; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000235:genetics; D051059:PTEN Phosphohydrolase / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000235:genetics; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D023041:Xenograft Model Antitumor Assays
chemical_list: D018076:DNA, Complementary; D009363:Neoplasm Proteins; D034741:RNA, Small Interfering; C512478:EGFR protein, human; D066246:ErbB Receptors; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human