Article (Scientific journals)
Sufasalazine unveils a contact-independent HSV-TK/ganciclovir gene therapy bystander effect in malignant gliomas
Robe, Pierre; Nguyen-Khac, Minh-Tuan; Lambert, Frédéric et al.
2007In International Journal of Oncology, 30 (1), p. 283-290
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Keywords :
glioma; gene therapy; Sulfasalazine; thymidine kinase; ganciclovir; bystander effect
Abstract :
[en] The efficacy of HSV-TK/ganciclovir-based gene therapy on malignant gliomas largely relies on the amplitude of the bystander effect. In these experiments, the anti-inflammatory drug Sulfasalazine increased the HSV-TK/ganciclovir bystander effect in C6, 9L and LN18 cells but not in U87 glioma cells. Using bi-compartmental culture devices and conditioned medium transfer experiments, we showed that in C6, 9L and LN18 cells but not in U87 cells, Sulfasalazine also unveiled a new, contact-independent mechanism of HSV-TK/ganciclovir bystander effect. Upon treatment with ganciclovir, human LN18-TK but not U87-TK cells synthetized and released TNF-alpha in the culture medium. Sulfasalazine sensitized glioma cells to the toxic effect of TNF-alpha. and enhanced its secretion in LN18-TK cells in response to GCV treatment. The caspase-8 inhibitor Z-IETD-FMK and a blocking antibody to TNF-alpha both inhibited the contact-independent bystander effect in LN18 cells. Taken together, these results suggest that TNF-alpha mediates the contact-independent bystander effect in LN18 cells. The treatment with GCV and/or Sulfasalazine of tumor xenografts consisting of a mix of 98% C6 and 2% C6-TK cells shows that Sulfasalazine is also a potent adjunct to the in vivo treatment of gliomas.
Disciplines :
Oncology
Author, co-author :
Robe, Pierre ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques
Nguyen-Khac, Minh-Tuan ;  Université de Liège - ULiège > Département des sciences cliniques > Neurochirurgie
Lambert, Frédéric ;  Centre Hospitalier Universitaire de Liège - CHU > Génétique
Lechanteur, Chantal ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie clinique
Jolois, Olivier ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie humaine
Ernst-Gengoux, P.
Rogister, Bernard  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biochimie et physiologie générales, et biochimie humaine
Bours, Vincent ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Génétique générale et humaine
Language :
English
Title :
Sufasalazine unveils a contact-independent HSV-TK/ganciclovir gene therapy bystander effect in malignant gliomas
Publication date :
January 2007
Journal title :
International Journal of Oncology
ISSN :
1019-6439
eISSN :
1791-2423
Publisher :
Professor D A Spandidos, Athens, Greece
Volume :
30
Issue :
1
Pages :
283-290
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 June 2010

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