title: Replication-competent Ad11p vector (RCAd11p) efficiently transduces and replicates in hormone-refractory metastatic prostate cancer cells.
abstract: Selective replication-competent adenovirus serotype 5 vectors have been used for prostate cancer therapy. Unfortunately, gene transfer is inefficient because hormone-refractory metastatic prostate cancer cells have minimal coxsackievirus-adenovirus receptor expression. Vectors based on species B adenoviruses are attractive tools for use in human gene therapy because the viruses have low seroprevalence and they have efficient transduction capacity. Most species B adenoviruses use ubiquitously expressed complement-regulatory CD46 protein as a cellular receptor. Here we report the transduction efficacy and oncolytic capacity of a replication-competent Ad11p (RCAd11p) vector in human prostate cancer cells. Green fluorescent protein was efficiently expressed in a dose-dependent manner in PC-3 and DU 145 cells derived from metastasis of prostate cancer to bone and brain, respectively. However, transduction was less effective in LNCaP cells derived from prostate cancer metastasis to lymph nodes. The oncolytic capacity of the RCAd11p vector was 100 times higher in PC-3 cells than in the two other cell lines. The oncolysis was independent of the level of expression of p53 in the cells or on the absence of E1B55k expression in the vector. In vivo experiments revealed significant growth inhibition of PC-3 tumors in the xenograft mouse group treated with RCAd11p vector or Ad11pwt in comparison with the untreated control group. Thus, we have demonstrated that RCAd11p vector intrinsically possesses oncolytic properties, which were active in targeting tumor cells. Consequently, the novel RCAd11p vector has great potential for the treatment of incurable metastatic prostate disease.
authors.affiliation: Department of Virology, Umeå University, SE-901 85 Umeå, Sweden.
authors.forename: Linda
authors.initials: L
authors.lastname: Sandberg
authors.forename: Praveen
authors.initials: P
authors.lastname: Papareddy
authors.forename: Jim
authors.initials: J
authors.lastname: Silver
authors.forename: Anders
authors.initials: A
authors.lastname: Bergh
authors.forename: Ya-Fang
authors.initials: YF
authors.lastname: Mei
mesh_terms: D000256:Adenoviridae / Q000235:genetics* / Q000502:physiology; D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000494:pharmacology; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein; D003588:Cytopathogenic Effect, Viral / Q000187:drug effects; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D005822:Genetic Vectors / Q000235:genetics*; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006728:Hormones / Q000494:pharmacology*; D006801:Humans; D016023:Integrins / Q000378:metabolism; D008297:Male; D051916:Membrane Cofactor Protein / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D009362:Neoplasm Metastasis; D011471:Prostatic Neoplasms / Q000473:pathology*; D011991:Receptors, Virus / Q000378:metabolism; D040521:Subcutaneous Tissue / Q000187:drug effects / Q000473:pathology; D014161:Transduction, Genetic; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000906:Antibodies; D000970:Antineoplastic Agents; C568771:CLMP protein, human; C568772:CLMP protein, mouse; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein; D006728:Hormones; D016023:Integrins; D051916:Membrane Cofactor Protein; D011991:Receptors, Virus; D016159:Tumor Suppressor Protein p53; D049452:Green Fluorescent Proteins