Journal
CANCER LETTERS
Volume 291, Issue 2, Pages 256-262Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2009.10.020
Keywords
Mesenchymal stem cell; Glioma leptomeningeal dissemination; Bystander effect; Herpes simplex virus-thymidine kinase; Ganciclovir
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Disseminating disease of high grade gliomas is difficult to treat. We examined the therapeutic effect of intrathecal administration of mesenchymal stem cells transduced with herpes simplex virus-thymidine kinase gene (MSCtk) followed by systemic ganciclovir (GCV) administration in rat experimental leptomeningeal glioma model. First, to examine in vivo bystander effect, rats were intrathecally co-injected with a mixture of MSCtk and C6 cells and then, intraperitoneally administered with GCV or saline for 10 days (co-injection model). Next, to examine the therapeutic effect of MSCtk/GCV therapy, MSCtk cells were intrathecally administered 1 day after C6 injection and then, GCV or saline was administered (treatment model). GCV administration significantly reduced tumor size on day 14 both in the co-injection model (0.41 +/- 0.22 vs. 3.10 +/- 0.97 mm(2), p < 0.01) and in the treatment model (0.73 +/- .29 vs. 2.84 +/- 0.82 mm(2), p < 0.01). Survival was also significantly prolonged in GCV group both in the co-injection model (29.2 +/- 3.3 vs. 18.8 +/- 0.8 days, p < 0.001) and in the treatment model (21.5 +/- 1.5 vs. 17.2 +/- 0.5 days, p < 0.001). This study provided a novel treatment strategy for leptomeningeal glioma dissemination using intrathecal MSCtk injection followed by systemic GCV administration. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
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