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  • Title: Retroviral delivery and tetracycline-dependent expression of IL-1beta-converting enzyme (ICE) in a rat glioma model provides controlled induction of apoptotic death in tumor cells.
    Author: Yu JS, Sena-Esteves M, Paulus W, Breakefield XO, Reeves SA.
    Journal: Cancer Res; 1996 Dec 01; 56(23):5423-7. PubMed ID: 8968096.
    Abstract:
    Interleukin 1beta-converting enzyme (ICE) is a member of a growing family of cysteine proteases shown to be a crucial component in the activation of a genetic program that leads to autonomous cell death in mammalian cells. In this study, a murine ICE-lacZ fusion gene was introduced into a novel retroviral vector designed to achieve regulated ectopic expression of a foreign gene in mammalian cells. By delivering the ICE-lacZ gene within a retroviral vector and under the control of a tetracycline-regulated promoter, we were able to utilize the intrinsic cell death program of ICE as a means for tumoricidal therapy in a rat brain tumor model. Both in culture and in vivo suppression of ICE-lacZ expression was extremely tight in the presence of tetracycline, as determined by the lack of X-galactosidase-positive tumor cells and by cell viability. When tetracycline was withdrawn, ICE-lacZ gene expression was rapidly turned on and apoptosis-mediated cell death occurred in essentially all tumor cells.
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