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  • Title: In vitro combined modality treatment of prostate carcinoma cells with 17-(allylamino)-17-demethoxygeldanamycin and ionizing radiation.
    Author: Ochel HJ, Gademann G.
    Journal: Anticancer Res; 2006; 26(3A):2085-91. PubMed ID: 16827149.
    Abstract:
    BACKGROUND: The effect of 17-(allylamino)-17-demethoxygeldanamycin (17-AAG), a benzoquinone-ansamycin-type Hsp90-inhibitor, on the expression of focal adhesion kinase (FAK) and, when combined with ionizing radiation, on the clonogenicity of prostate cancer cells were determined. MATERIALS AND METHODS: FAK was analyzed by Western immunoblot. Prostate carcinoma cells were exposed either to 17-AAG alone or combined with a single radiation fraction of 3 Gy. RESULTS: FAK concentrations were reduced by 17-AAG in a time-dependent manner. Treatment with 100 nM 17-AAG for 24 h reduced clonogenicity by 90%. The plot of surviving fraction versus radiation energy dose yielded roughly parallel graphs for solvent- and 17-AAG-treated cells. CONCLUSION: 17-AAG induced rapid degradation of FAK A single radiation fraction of 3 Gy did not enhance the dose-dependent drug-effect on survival. In this sequence, the combined effect of both modalities towards clonogenicity was largely additive.
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