title: Human adipose tissue-derived mesenchymal stem cells expressing yeast cytosinedeaminase::uracil phosphoribosyltransferase inhibit intracerebral rat glioblastoma.
abstract: Prodrug cancer gene therapy by mesenchymal stem cells (MSCs) targeted to tumors represents an attractive tool to activate prodrugs directly within the tumor mass, thus avoiding systemic toxicity. In this study, we tested the feasibility and efficacy of human adipose tissue-derived MSCs, engineered to express the suicide gene cytosine deaminase::uracil phosphoribosyltransferase to treat intracranial rat C6 glioblastoma. Experiments were designed to simulate conditions of future clinical application for high-grade glioblastoma therapy by direct injections of therapeutic stem cells into tumor. We demonstrated that genetically modified therapeutic stem cells still have the tumor tropism when injected to a distant intracranial site and effectively inhibited glioblastoma growth after 5-fluorocytosine (5-FC) therapy. Coadministration of C6 cells and therapeutic stem cells with delayed 5-FC therapy improved the survival in a therapeutic stem cell dose-dependent manner and induced complete tumor regression in a significant number of animals. Continuous intracerebroventricular delivery of 5-FC using osmotic pump reduced the dose of prodrug required for the same therapeutic effect, and along with repeated administration of therapeutic stem cells increased the survival time. Intracerebral injection of therapeutic stem cells and treatment with 5-FC did not show any detectable adverse effects. Results support the arguments to begin clinical studies for treatment of high-grade brain tumors.
authors: Cancer Research Institute, Slovak Academy of Sciences, Bratislava, Slovakia.
authors: Veronika
authors: V
authors: Altanerova
authors: Marina
authors: M
authors: Cihova
authors: Michal
authors: M
authors: Babic
authors: Boris
authors: B
authors: Rychly
authors: Katarina
authors: K
authors: Ondicova
authors: Boris
authors: B
authors: Mravec
authors: Cestmir
authors: C
authors: Altaner
mesh_terms: D000273:Adipose Tissue / Q000166:cytology; D000818:Animals; D001932:Brain Neoplasms / Q000628:therapy*; D045744:Cell Line, Tumor; D003131:Combined Modality Therapy; D043525:Cytosine Deaminase / Q000235:genetics*; D005240:Feasibility Studies; D005437:Flucytosine / Q000008:administration & dosage; D041722:Genes, Transgenic, Suicide; D015316:Genetic Therapy / Q000379:methods*; D005909:Glioblastoma / Q000628:therapy*; D006801:Humans; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D010430:Pentosyltransferases / Q000235:genetics*; D011355:Prodrugs; D051381:Rats; D017207:Rats, Sprague-Dawley; D015003:Yeasts / Q000235:genetics
chemical_list: D011355:Prodrugs; D005437:Flucytosine; D010430:Pentosyltransferases; C023269:uracil phosphoribosyltransferase; D043525:Cytosine Deaminase