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Citations to this article

Alkylpurine–DNA–N-glycosylase confers resistance to temozolomide in xenograft models of glioblastoma multiforme and is associated with poor survival in patients
Sameer Agnihotri, … , Monika Hegi, Abhijit Guha
Sameer Agnihotri, … , Monika Hegi, Abhijit Guha
Published December 12, 2011
Citation Information: J Clin Invest. 2012;122(1):253-266. https://doi.org/10.1172/JCI59334.
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Alkylpurine–DNA–N-glycosylase confers resistance to temozolomide in xenograft models of glioblastoma multiforme and is associated with poor survival in patients

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Abstract

Glioblastoma multiforme (GBM) is the most common and lethal of all gliomas. The current standard of care includes surgery followed by concomitant radiation and chemotherapy with the DNA alkylating agent temozolomide (TMZ). O6-methylguanine–DNA methyltransferase (MGMT) repairs the most cytotoxic of lesions generated by TMZ, O6-methylguanine. Methylation of the MGMT promoter in GBM correlates with increased therapeutic sensitivity to alkylating agent therapy. However, several aspects of TMZ sensitivity are not explained by MGMT promoter methylation. Here, we investigated our hypothesis that the base excision repair enzyme alkylpurine–DNA–N-glycosylase (APNG), which repairs the cytotoxic lesions N3-methyladenine and N7-methylguanine, may contribute to TMZ resistance. Silencing of APNG in established and primary TMZ-resistant GBM cell lines endogenously expressing MGMT and APNG attenuated repair of TMZ-induced DNA damage and enhanced apoptosis. Reintroducing expression of APNG in TMZ-sensitive GBM lines conferred resistance to TMZ in vitro and in orthotopic xenograft mouse models. In addition, resistance was enhanced with coexpression of MGMT. Evaluation of APNG protein levels in several clinical datasets demonstrated that in patients, high nuclear APNG expression correlated with poorer overall survival compared with patients lacking APNG expression. Loss of APNG expression in a subset of patients was also associated with increased APNG promoter methylation. Collectively, our data demonstrate that APNG contributes to TMZ resistance in GBM and may be useful in the diagnosis and treatment of the disease.

Authors

Sameer Agnihotri, Aaron S. Gajadhar, Christian Ternamian, Thierry Gorlia, Kristin L. Diefes, Paul S. Mischel, Joanna Kelly, Gail McGown, Mary Thorncroft, Brett L. Carlson, Jann N. Sarkaria, Geoffrey P. Margison, Kenneth Aldape, Cynthia Hawkins, Monika Hegi, Abhijit Guha

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GP Dunn, ML Rinne, J Wykosky, G Genovese, SN Quayle, IF Dunn, PK Agarwalla, MG Chheda, B Campos, A Wang, C Brennan, KL Ligon, F Furnari, WK Cavenee, RA Depinho, L Chin, WC Hahn
Genes & development 2012
The strategy for enhancing temozolomide against malignant glioma
M Nakada, T Furuta, Y Hayashi, T Minamoto, JI Hamada
Frontiers in Oncology 2012
Repair of 3-methyladenine and abasic sites by base excision repair mediates glioblastoma resistance to temozolomide
MS Bobola, DD Kolstoe, A Blank, MC Chamberlain, JR Silber
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Complex DNA repair pathways as possible therapeutic targets to overcome temozolomide resistance in glioblastoma
K Yoshimoto, M Mizoguchi, N Hata, H Murata, R Hatae, T Amano, A Nakamizo, T Sasaki
Frontiers in Oncology 2012
Pulmonary surfactant: an immunological perspective
ZC Chroneos, Z Sever-Chroneos, VL Shepherd
Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology 2009

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