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Abstract B21: The selective ATR inhibitor VX-970 enhances the therapeutic effects of standards of care in glioblastoma
Glioblastoma (GBM) represents one of the most aggressive cancer types with the vast majority of patients succumbing to disease within the first five years. This dire prognosis reflects the limited efficacy of our frontline therapies which include radiation therapy and temozolomide (TMZ) chemotherapy. The cellular response to these therapies is critically mediated by DNA damage response signaling networks that are regulated by Ataxia Telangiectasia Mutated (ATM) and Ataxia Telangiectasia And Rad3-Related Protein (ATR). Preliminary studies from our laboratory suggest the ATR inhibitor VX-970 has single agent efficacy in both...
Source: Molecular Cancer Research - April 2, 2017 Category: Cancer & Oncology Authors: Burgenske, D., Mladek, A., Sarkaria, J. Tags: Therapies Targeting Checkpoints and Mismatch Repair: Poster Presentations - Proffered Abstracts Source Type: research

Abstract B29: LRP16 is an essential mediator for DNA double-strand breaks induced NF-kappaB activation
In this study, we demonstrate that LRP16 constitutively interacts with PARP1 and IKKgamma. This interaction is essential for efficient interactions among PARP1, IKKgamma, and PIASy, the modifications of IKKgamma, and the activation of NF-kappaB following DSB induction. The regulation of LRP16 in NF-kappaB activation is dependent on its poly (ADP-ribose) binding capability through the unique macro domain. The depletion of the DSB-specific sensor Ku80 resulted in a significant reduction in the physical interactions among LRP16, PARP1 and IKKgamma. Additionally, the knockdown of either endogenous Ku80 or Ku70 by siRNA markedl...
Source: Molecular Cancer Research - January 15, 2016 Category: Cancer & Oncology Authors: Wu, Z., Wang, C., Bai, M., Li, X., Mei, Q., Li, X., Wang, Y., Fu, X., Luo, G., Han, W. Tags: Signaling Pathways and Cancer Metabolism: Poster Presentations - Proffered Abstracts Source Type: research

ATR and ATM Loss-of-Function
Mechanisms to maintain genomic integrity are essential for cells to remain viable. Not surprisingly, disruption of key DNA damage response pathway factors, such as ataxia telangiectasia-mutated (ATM)/ataxia telangiectasia and RAD3-related (ATR) results in loss of genomic integrity. Here, a synthetic lethal siRNA-screening approach not only confirmed ATM but identified additional replication checkpoint proteins, when ablated, enhanced ATR inhibitor (ATRi) response in a high-content -H2AX assay. Cancers with inactivating ATM mutations exhibit impaired DNA double-stranded break (DSB) repair and rely on compensatory repair pat...
Source: Molecular Cancer Research - January 15, 2015 Category: Cancer & Oncology Authors: Menezes, D. L., Holt, J., Tang, Y., Feng, J., Barsanti, P., Pan, Y., Ghoddusi, M., Zhang, W., Thomas, G., Holash, J., Lees, E., Taricani, L. Tags: DNA Damage and Repair Source Type: research