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Altered Nuclear Localization of Bax Protein in BCNU-resistant Glioma Cells

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Abstract

To investigate the role of apoptosis suppression in glioma chemotherapy resistance, protein levels and subcellular localization of bcl-2 family members were investigated in 2 pairs of sensitive cell lines and their in vitro generated resistant derivatives. The alkylating agent, 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU), induced apoptosis in both sensitive cell strains and apoptosis was suppressed in both resistant derivatives. Both resistant cell lines contained altered regulation of a bcl-2 related protein consistent with the suppression of apoptosis. Independent of which bcl-2 family member was dysregulated, resistance was associated with altered regulation in the subcellular localization of bax protein. Following BCNU treatment, bax accumulated in nucleoli and a nuclei containing fraction of sensitive cells but not their resistant derivatives. Nuclear accumulation was an early event in apotosis induction. These data indicates altered subcellular localization of bax may play a role in resistance. In addition, the association between an early, nucleolar localization of bax and the induction of apoptosis suggests that localization of bax to nucleoli may play a role in apoptosis-induction of glioma cells.

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Joy, A., Panicker, S. & Shapiro, J. Altered Nuclear Localization of Bax Protein in BCNU-resistant Glioma Cells. J Neurooncol 49, 117–129 (2000). https://doi.org/10.1023/A:1026574123273

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  • DOI: https://doi.org/10.1023/A:1026574123273

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