Lentivirus vector-mediated genetic manipulation of oncogenic pathways induces tumor formation in rabbit brain

Farizan Ahmad, Anna Hyvärinen, Agnieszka Pirinen, Venla Olsson, Jaana Rummukainen, Arto Immonen, Johanna Närväinen, Pasi Tuunanen, Timo Liimatainen, Virve Kärkkäinen, Jari Koistinaho, Seppo Ylä-Herttuala (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Translation of promising experimental therapies from rodent models to clinical success has been complicated as the novel therapies often fail in clinical trials. Existing rodent glioma models generally do not allow for preclinical evaluation of the efficiency of novel therapies in combination with surgical resection. Therefore, the aim of the present study was to develop a larger animal model utilizing lentivirus vector-mediated oncogenic transformation in the rabbit brain. Lentiviruses carrying constitutively active AKT and H-Ras oncogenes, and p53 small interfering (si)RNA were introduced into newborn rabbit neural stem cells (NSCs) and intracranially implanted into rabbits' brains to initiate tumor formation. In one of the ten rabbits a tumor was detected 48 days after the implantation of transduced NSCs. Histological features of the tumor mimic was similar to a benign Grade II ganglioglioma. Immunostaining demonstrated that the tissues were positive for AKT and H-Ras. Strong expression of GFAP and Ki-67 was also detected. Additionally, p53 expression was notably lower in the tumor area. The implantation of AKT, H-Ras and p53 siRNA transduced NSCs for tumor induction resulted in ganglioglioma formation. Despite the low frequency of tumor formation, this preliminary data provided a proof of principle that lentivirus vectors carrying oncogenes can be used for the generation of brain tumors in rabbits. Moreover, these results offer noteworthy insights into the pathogenesis of a rare brain tumor, ganglioglioma.

    Original languageEnglish
    Article numberA38
    JournalMolecular Medicine Reports
    Volume23
    Issue number6
    DOIs
    Publication statusPublished - Jun 2021
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Ganglioglioma
    • Lentivirus vector
    • Oncogenes
    • Rabbit brain tumor model

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