Myxoma virus virotherapy for glioma in immunocompetent animal models: Optimizing administration routes and synergy with rapamycin

Xue Qing Lun, Tommy Alain, Franz J. Zemp, Hongyuan Zhou, Masmudur M. Rahman, Mark G. Hamilton, Grant McFadden, John Bell, Donna L. Senger, Peter A. Forsyth

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

Oncolytic myxoma virus (MYXV) is being developed as a novel virotherapeutic against human brain cancer and has promising activity against human brain tumor models in immunocompromised hosts. Because an intact immune system could reduce its efficacy, the purpose of this study was to evaluate the oncolytic potential of MYXV in immunocompetent racine glioma models. Here, we report that MYXV infects and kills all racine cell glioma lines and that its effects are enhanced by rapamycin. Intratumoral administration of MYXV with rapamycin improved viral replication in the tumor and significantly prolonged host survival. Similarly, coadministration via a method of convection-enhanced delivery (CED) enhanced viral replication and efficacy in vivo. Mechanisms by which rapamycin improved MYXV oncolysis included an inhibition of type I IFN production in vitro and a reduction of intratumoral infiltration of CD68+ microglia/macrophages and CD163+ macrophages in vivo. Our findings define a method to improve MYXV efficacy against gliomas by rapamycin coadministration, which acts to promote immune responses engaged by viral delivery.

Original languageEnglish (US)
Pages (from-to)598-608
Number of pages11
JournalCancer Research
Volume70
Issue number2
DOIs
StatePublished - Jan 15 2010
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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