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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/38652

Title: Temozolomide Resistance in Glioblastoma Cell Lines: Implication of MGMT, MMR, P-Glycoprotein and CD133 Expression
Authors: Perazzoli, Gloria
Prados Salazar, José Carlos
Ortiz Quesada, Raúl
Caba Pérez, Octavio
Cabeza, Laura
Berdasco, María
González Astorga, Beatriz
Melguizo Alonso, Consolación
Issue Date: 2015
Abstract: [Background] The use of temozolomide (TMZ) has improved the prognosis for glioblastoma multiforme patients. However, TMZ resistance may be one of the main reasons why treatment fails. Although this resistance has frequently been linked to the expression of O6-methylguanine-DNA methyltransferase (MGMT) it seems that this enzyme is not the only molecular mechanism that may account for the appearance of drug resistance in glioblastoma multiforme patients as the mismatch repair (MMR) complex, P-glycoprotein, and/or the presence of cancer stem cells may also be implicated.
[Methods] Four nervous system tumor cell lines were used to analyze the modulation of MGMT expression and MGMT promoter methylation by TMZ treatment. Furthermore, 5-aza-2’-deoxycytidine was used to demethylate the MGMT promoter and O(6)-benzylguanine to block GMT activity. In addition, MMR complex and P-glycoprotein expression were studied before and after TMZ exposure and correlated with MGMT expression. Finally, the effect of TMZ exposure on CD133 expression was analyzed.
[Results] Our results showed two clearly differentiated groups of tumor cells characterized by low (A172 and LN229) and high (SF268 and SK-N-SH) basal MGMT expression. Interestingly, cell lines with no MGMT expression and low TMZ IC50 showed a high MMR complex expression, whereas cell lines with high MGMT expression and high TMZ IC50 did not express the MMR complex. In addition, modulation of MGMT expression in A172 and LN229 cell lines was accompanied by a significant increase in the TMZ IC50, whereas no differences were observed in SF268 and SK-N-SH cell lines. In contrast, P-glycoprotein and CD133 was found to be unrelated to TMZ resistance in these cell lines.
[Conclusions] These results may be relevant in understanding the phenomenon of TMZ resistance, especially in glioblastoma multiforme patients laking MGMT expression, and may also aid in the design of new therapeutic strategies to improve the efficacy of TMZ in glioblastoma multiforme patients.
Sponsorship: This study was supported by the Fundació la Marató TV3 via project no. 111431, and by the Consejería de Salud de la Junta de Andalucía through Project no. PI-0049.
Publisher: Public Library of Science (PLOS)
Keywords: Cancer treatment
DNA methylation
Gene expression
Cancer stem cells
Cell cycle and cell division
G1 phase
G2 phase
Glioblastoma multiforme
URI: http://hdl.handle.net/10481/38652
ISSN: 1932-6203
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Perazzoli, G.; et al. Temozolomide Resistance in Glioblastoma Cell Lines: Implication of MGMT, MMR, P-Glycoprotein and CD133 Expression. Plos One, 10(10): e0140131 (2015). [http://hdl.handle.net/10481/38652]
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