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Gap junctions in human glioblastomas: implications for suicide gene therapy

Cancer Gene Therapy volume 18, pages 674–681 (2011)Cite this article

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Abstract

Glioblastoma is a very aggressive astrocytic tumor and most patients have 1-year survival time after diagnosis. A promising therapeutic strategy is the local delivery of the herpes simplex virus thymidine kinase gene in the tumor bed followed by ganciclovir treatment. The presence of functional gap junctions is highly relevant for the success of suicide gene therapy. Connexins are expressed in practically all tissues and form gap junctions that allow intercellular communication. Connexin 43 (Cx43) is the major connexin member being expressed in astrocytes but its status in glioblastoma is not well defined. We have investigated by immunofluorescence the presence of Cx43 in 74 human glioblastoma samples; its expression was detected in 77% of the samples analyzed. We report here that glioblastoma is a heterogenous disease as regards Cx43 expression with presentations, in which Cx43 expression is unaltered, reduced or totally lost. A predominant Cx43 cytoplasmic localization was observed in four out of eight primary glioblastoma cultures that we have established. This aberrant localization reduced gap junctionnal intercellular communication by 50 to 75% as compared with primary cell cultures displaying gap junctional plaques. However, the bystander effect evaluated after lentiviral delivery of the herpes simplex virus thymidine kinase gene and ganciclovir treatment was detected in all Cx43-positive primary cell cultures, and it was independant of the Cx43 localization. These findings may have important clinical implications for the design of anticancer cytotoxic therapies that rely on the gap junction-mediated bystander effect for their success.

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Acknowledgements

We are grateful to Pedro Otavio de Campos-Lima for critical reading of the manuscript. This work was supported in part by Schering-Plough Canada.

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Authors and Affiliations

  1. Centre de Recherche en Cancérologie de l’Université Laval, L’Hôtel-Dieu de Québec, Centre Hospitalier Universitaire de Québec, Québec, Canada

    S Cottin & M Caruso

  2. Hôpital Enfant-Jésus, Centre Hospitalier Affilié Universitaire de Québec, Québec, Canada

    P V Gould & L Cantin

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  1. S Cottin
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Correspondence to M Caruso.

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Cottin, S., Gould, P., Cantin, L. et al. Gap junctions in human glioblastomas: implications for suicide gene therapy. Cancer Gene Ther 18, 674–681 (2011). https://doi.org/10.1038/cgt.2011.38

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