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Inhibition of progression to androgen-independence by combined adjuvant treatment with antisense BCL-XL and antisense Bcl-2 oligonucleotides plus taxol after castration in the Shionogi tumor model by Hideaki Miyake; Brett P. Monia; Martin E. Gleave is a Medicine article available to read on EtoBox.

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We have reported that antisense Bcl-2 oligodeoxynucleotide (ODN) delays progression to androgen independence in the androgen-dependent (AD) mouse Shionogi tumor model. Here, we characterize changes in bcl-xL, another important anti-apoptotic gene, and test the efficacy of adjuvant antisense Bcl-xL ODN therapy either alone or in combination with antisense Bcl-2 ODN and chemotherapy after castration in the Shionogi tumor model. Bcl-xL mRNA levels increased up to 3-fold postcastration and remained 1.5-fold higher in androgen-independent (AI) recurrent tumors compared with AD tumors before castration. Treatment of Shionogi cells with antisense Bcl-xL ODN inhibited Bcl-xL expression in a dose-dependent and sequence-specific manner. Systemic administration of antisense Bcl-xL ODN in mice bearing Shionogi tumors after castration delayed emergence of AI recurrent tumors. We then examined whether combined adjuvant antisense Bcl-xL and/or Bcl-2 ODNs plus taxol (paclitaxel) therapy further delays time to AI progression. Combined treatment of Shionogi cells with antisense Bcl-xL and Bcl-2 ODNs significantly enhanced taxol chemosensitivity compared with either agent alone, reducing the IC 50 of

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Author

Hideaki Miyake; Brett P. Monia; Martin E. Gleave

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley; Research Square; Test accounts (ISSN 0020-7136)

Published

2000

Language

EN

Field

Medicine (Health Sciences)