Gene therapy for peritoneal dissemination of pancreatic cancer by liposome-mediated transfer of herpes simplex virus thymidine kinase gene

Human Gene Therapy
K AokiM Terada

Abstract

Peritoneal dissemination is one of the most common complications of the malignancies of the digestive system, such as gastric or pancreatic cancers. Yet, no effective therapy has been established so far to alleviate this devastating and often fatal end-stage condition. Here we describe a novel approach of intraperitoneal (i.p.) lipofection of a suicidal gene to the pancreatic cancer cells in a mouse peritoneal dissemination model. A human pancreatic cancer cell line, PSN-1, was inoculated into the peritoneal cavity of nude mice. Eight days later, a herpes simplex virus thymidine kinase (HSV-TK) gene expression plasmid under a potent hybrid promoter CAG was injected as a DNA-lipopolyamine complex. Ganciclovir (GCV) was then administered for 8 days, and the mice were examined for tumor development at the 24th day after the tumor inoculation. Although all 24 control mice showed macroscopic peritoneal dissemination and solid tumors on the pancreas, 8 of the 14 mice treated with HSV-TK and GCV were free of tumors, and only a few small tumors were observed in the remaining 6 mice. Treatment-related toxicity was not observed. The semiquantitative reverse transcription polymerase chain reaction (RT-PCR) analysis suggested that the HSV-...Continue Reading

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