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Bystander Effect in Herpes Simplex Virus-Thymidine Kinase/Ganciclovir Cancer Gene Therapy: Role of Gap-junctional Intercellular Communication¹

Unit of Multistage Carcinogenesis, IARC, F-69372, Lyon cedex 08, France

Antitumor suicide gene therapy is one of the emerging strategies against cancer. It consists of the introduction into cancer cells of a gene capable of converting a nontoxic prodrug into a cytotoxic drug. Because this therapeutic gene cannot be easily introduced into the whole cell population of a tumor, the successful eradication of tumors depends on a phenomenon called the "bystander effect," by which the introduced gene can affect even cells in which it is not itself present. From a therapeutic point of view, it may be crucial to enhance this phenomenon through various means to achieve tumor eradication. One such suicide gene, the thymidine kinase gene from the herpes simplex virus, in combination with the prodrug ganciclovir, has been extensively and successfully used in some animal models exhibiting a strong bystander effect. Among the mechanisms involved in this phenomenon, gap junctional intercellular communication (GJIC) is directly involved in the transfer of the toxic metabolites of ganciclovir, which pass directly from herpes simplex virus thymidine kinase-expressing cells to surrounding cells that do not express it. Because GJIC appears to be a mediator of the bystander effect both in vitro and in vivo, here we review possible molecular strategies for enhancing the extent of tumor cell death by increasing the intratumoral GJIC capacity.

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