title: Oncolytic adenovirus armed with shRNA targeting MYCN gene inhibits neuroblastoma cell proliferation and in vivo xenograft tumor growth.
abstract: OBJECTIVE
  MYCN amplification and p53 inactivation are two typical characteristics of aggressive neuroblastomas and are strongly associated with cancer progression and treatment failure. In an effort to develop new therapeutic agents to treat the aggressive neuroblastomas, we constructed ZD55-shMYCN, an oncolytic adenovirus ZD55 carrying short hairpin RNA (shRNA) targeting MYCN gene, and investigated the effects on proliferation of the p53-null and MYCN-amplified neuroblastoma cell line LA1-55N in vitro and in vivo by ZD55-shMYCN.
  
  
  METHODS
  In this study, we used ZD55-shMYCN to treat p53-null and MYCN-amplified neuroblastoma cells. To confirm the ability of selective replication of the ZD55-shMYCN, we examined the expression of E1A protein by western blotting. We used quantitative real-time PCR analysis and western blotting analysis to determine the inhibitory effect of ZD55-shMYCN on MYCN expression. MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] cell proliferation assay and xenograft mouse model were used to test the antigrowth efficacy of ZD55-shMYCN.
  
  
  RESULTS
  The results showed that ZD55-shMYCN selectively replicated and significantly downregulated the MYCN expression in LA1-55N cells. ZD55-shMYCN effectively inhibited the proliferation in LA1-55N cells in vitro and significantly inhibited tumor growth in vivo xenograft tumor in nude mice.
  
  
  CONCLUSIONS
  ZD55-shMYCN provides a novel agent for treating MYCN-amplified and p53-inactive aggressive neuroblastoma, representing a promising approach for further clinical development.
authors: Department of Pediatric Surgery, Xuzhou Children's Hospital, 18 Suti North Road, Xuzhou, 221006, Jiangsu, China. liyuan_010324@163.com
authors: Yuan
authors: Y
authors: Li
authors: Baofu
authors: B
authors: Zhang
authors: Hongwei
authors: H
authors: Zhang
authors: Xiaoyu
authors: X
authors: Zhu
authors: Dongchuan
authors: D
authors: Feng
authors: Deyong
authors: D
authors: Zhang
authors: Baobiao
authors: B
authors: Zhuo
authors: Liantao
authors: L
authors: Li
authors: Junnian
authors: J
authors: Zheng
mesh_terms: D000256:Adenoviridae / Q000235:genetics* / Q000378:metabolism; D017500:Adenovirus E1A Proteins / Q000235:genetics / Q000378:metabolism; D000818:Animals; D015153:Blotting, Western; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival; D003131:Combined Modality Therapy; D015870:Gene Expression; D057809:HEK293 Cells; D006801:Humans; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D000071447:N-Myc Proto-Oncogene Protein; D009447:Neuroblastoma / Q000235:genetics / Q000473:pathology / Q000628:therapy*; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D015513:Oncogene Proteins / Q000235:genetics* / Q000378:metabolism; D050130:Oncolytic Virotherapy; D050504:Oncolytic Viruses / Q000235:genetics* / Q000378:metabolism; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D023041:Xenograft Model Antitumor Assays / Q000379:methods*
chemical_list: D017500:Adenovirus E1A Proteins; C459801:MYCN protein, human; D000071447:N-Myc Proto-Oncogene Protein; D009687:Nuclear Proteins; D015513:Oncogene Proteins; D034741:RNA, Small Interfering