Abstract:
:The role of poly (ADP-ribose) polymerase 1 (PARP1) in cancer has been extensively studied in the context of DNA repair, leading to clinical trials of PARP1 inhibitors in cancers defective in homologous recombination. However, the DNA repair-independent roles of PARP1 in carcinogenesis and metastasis, particularly in lung cancer metastasis, remain largely uncharacterized. Here, we report that PARP1 promotes lung adenocarcinoma relapse to the brain and bones by regulating several steps of the metastatic process in a DNA repair-independent manner. We find that PARP1 expression is associated with overall and distant metastasis-free survival in lung adenocarcinoma patients. Consistent with this, genetic knockdown and pharmacological inhibition of PARP1 significantly attenuated the metastatic potential of lung adenocarcinoma cells. Further investigation revealed that PARP1 potentiates lung adenocarcinoma metastasis by promoting invasion, anoikis resistance, extravasation and self-renewal of lung adenocarcinoma cells and also by modifying the brain microenvironment. Finally, we identified S100A4 and CLDN7 as novel transcriptional targets and clinically relevant effectors of PARP1. Collectively, our study not only revealed previously unknown functions of PARP1 in lung adenocarcinoma metastasis but also delineated the molecular mechanisms underlying the pro-metastatic function of PARP1. Furthermore, these findings provide a foundation for the potential use of PARP1 inhibitors as a new treatment option for lung adenocarcinoma patients with elevated PARP1 expression.
journal_name
Oncogenejournal_title
Oncogeneauthors
Choi EB,Yang AY,Kim SC,Lee J,Choi JK,Choi C,Kim MYdoi
10.1038/onc.2016.3subject
Has Abstractpub_date
2016-09-01 00:00:00pages
4569-79issue
35eissn
0950-9232issn
1476-5594pii
onc20163journal_volume
35pub_type
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