Lentiviral HSV-Tk.007-mediated suicide gene therapy is not toxic for normal brain cells

Jubayer A. Hossain, Lars Rømo Ystaas, Jelena Mrdalj, Kristjan Välk, Kristoffer Riecken, Boris Fehse, Rolf Bjerkvig, Janne Grønli, Hrvoje Miletic*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)


Background: Gene therapeutic strategies with suicide genes are currently investigated in clinical trials for brain tumors. Previously, we have shown that lentiviral vectors delivering the suicide gene HSV-Tk to experimental brain tumors promote a highly significant treatment effect and thus are promising vectors for clinical translation. Methods: In the present study, we tested lentiviral vectors delivering the suicide gene HSV-Tk.007, a highly active mutant of HSV-Tk, to rat brains as a preclinical toxicity study. We injected 106 vesicular stomatitis virus glycoprotein (VSV-G) pseudotyped functional lentiviral particles harboring the suicide gene HSV-Tk.007 into the brain of healthy, immunocompetent rats. During prodrug treatment with ganciclovir (GCV), we measured weight and assessed the behavior of the rats in an open field test. After 14 days of GCV treatment, we analyzed HSV-Tk.007 expression in different brain cell populations, as well as inflammatory responses and apoptosis. Results: During prodrug treatment with GCV, behavior experiments did not reveal differences between the treated rats and the control groups. Analysis of HSV-Tk expression in different brain cell populations showed that transduced normal brain cells survived GCV treatment. There were no statistically significant differences in the number of transduced cells between treatment and control groups. Furthermore, inflammatory responses and apoptosis of brain cells were not observed. Conclusions: We show that HSV-Tk.007-mediated suicide gene therapy is not toxic to normal brain cells. This observation is of high relevance for the translation of lentivirus-mediated suicide gene therapies into the clinic for the treatment of brain tumor patients.

Original languageEnglish
Pages (from-to)234-243
Number of pages10
JournalJournal of Gene Medicine
Issue number9
Publication statusPublished - 1 Sept 2016


  • HSV-Tk
  • VSV-G
  • glioma
  • lentiviral vectors
  • suicide gene therapy
  • toxicity


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