Transcriptomics reveals in vivo efficacy of PARP inhibitor combinatorial synergy with platinum-based chemotherapy in human non-small cell lung carcinoma models
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Lindsay R. Stolzenburg1,*, Barrett Ainsworth1,*, Bridget Riley-Gillis1, Tibor Pakozdi1, Areej Ammar1, Paul A. Ellis1, Julie L. Wilsbacher1 and Cyril Y. Ramathal1
1 AbbVie Inc., North Chicago, IL 60064, USA
* These authors contributed equally to this work
|Cyril Y. Ramathal,||email:||[email protected]|
Keywords: PARP inhibitor; veliparib; cisplatin; transcriptomics; NSCLC
Abbreviations: PARP: poly(ADP)-ribose polymerase; PARPi: poly(ADP)-ribose polymerase inhibitors; NSCLC: non-small cell lung cancer; DEGs: differentially expressed genes
Received: November 19, 2021 Accepted: December 10, 2021 Published: January 03, 2022
Inhibitors of poly(ADP)-ribose polymerase (PARP) exploit defective DNA repair pathways existing in several forms of cancer, such as those with BRCA mutations, and have proven clinical efficacy as chemosensitizers. However, platinum-based chemopotentiation by PARP inhibitors (PARPi), particularly for non-small cell lung cancer (NSCLC), has only been confirmed in a few preclinical models and the molecular mechanisms that drive PARPi combinatorial synergy with chemotherapeutics remains poorly defined. To better understand these mechanisms, we characterized cisplatin and veliparib efficacy in A549 and Calu6 NSCLC in vivo tumor xenograft models and observed combinatorial synergy in the Calu6 model. Transcriptome-wide analysis of xenografts revealed several differentially expressed genes (DEGs) between untreated and cisplatin + veliparib-treated groups, which were unique from genes identified in either of the single-agent treatment arms. Particularly at 10- and 21-days post-treatment, these DEGs were enriched within pathways involved in DNA damage repair, cell cycle regulation, and senescence. Furthermore, TGF-β- and integrin-related pathways were enriched in the combination treatment arm, while pathways involved in cholesterol metabolism were identified at earlier time points in both the combination and cisplatin-only groups. These data advance the biological underpinnings of PARPi combined with platinum-based chemotherapy and provides additional insight into the diverse sensitivity of NSCLC models.
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