alexa Prostate specific membrane antigen (PSMA) is a tissue-specific target for adenoviral transduction of prostate cancer in vitro.

Author(s): Kraaij R, van Rijswijk AL, Oomen MH, Haisma HJ, Bangma CH

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Abstract BACKGROUND: Adenovirus binds to the coxsackievirus and adenovirus receptor (CAR) as a first step in the process of cellular infection. This dependence on CAR potentially limits the use of adenovirus in gene therapy, since CAR is expressed in many tissues of the body, and expression of CAR may be low or lost upon progression of certain tumors. These limitations may be overcome by transductional targeting of adenovirus towards other cell surface molecules. We have evaluated the pantumoral epithelial cell adhesion molecule (EpCAM) and prostate specific membrane antigen (PSMA) as possible targets for adenoviral transduction of prostate cancer cells. METHODS: Bispecific antibodies, constructed as conjugates between an anti-adenovirus fiber knob Fab' fragment and anti-EpCAM or anti-PSMA monoclonal antibodies, were incubated with an eGFP-expressing adenovirus to retarget this vector. A cell panel, that includes two prostate cancer cell lines and four non-prostate control lines, were infected with serial dilutions of the retargeted vector and specificity of infection was determined. RESULTS: Receptor-specific transduction was obtained for both EpCAM and PSMA. PSMA-retargeting was shown to be selective for the prostate cancer cell lines. CONCLUSIONS: PSMA serves as a tissue-specific target for adenoviral vectors and may be applicable for gene therapeutical treatment of prostate cancer. 2004 Wiley-Liss, Inc. This article was published in Prostate and referenced in

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