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Ref Type Journal Article
PMID (30297535)
Authors Wang Z, Grosskurth SE, Cheung T, Petteruti P, Zhang J, Wang X, Wang W, Gharahdaghi F, Wu J, Su N, Howard RT, Mayo M, Widzowski D, Scott DA, Johannes JW, Lamb ML, Lawson D, Dry JR, Lyne PD, Tate EW, Zinda M, Mikule K, Fawell SE, Reimer C, Chen H
Title Pharmacological Inhibition of PARP6 Triggers Multipolar Spindle Formation and Elicits Therapeutic Effects in Breast Cancer.
Journal Cancer research
Vol 78
Issue 23
Date 2018 12 01
URL
Abstract Text : PARP proteins represent a class of post-translational modification enzymes with diverse cellular functions. Targeting PARPs has proven to be efficacious clinically, but exploration of the therapeutic potential of PARP inhibition has been limited to targeting poly(ADP-ribose) generating PARP, including PARP1/2/3 and tankyrases. The cancer-related functions of mono(ADP-ribose) generating PARP, including PARP6, remain largely uncharacterized. Here, we report a novel therapeutic strategy targeting PARP6 using the first reported PARP6 inhibitors. By screening a collection of PARP compounds for their ability to induce mitotic defects, we uncovered a robust correlation between PARP6 inhibition and induction of multipolar spindle (MPS) formation, which was phenocopied by PARP6 knockdown. Treatment with AZ0108, a PARP6 inhibitor with a favorable pharmacokinetic profile, potently induced the MPS phenotype, leading to apoptosis in a subset of breast cancer cells in vitro and antitumor effects in vivo. In addition, Chk1 was identified as a specific substrate of PARP6 and was further confirmed by enzymatic assays and by mass spectrometry. Furthermore, when modification of Chk1 was inhibited with AZ0108 in breast cancer cells, we observed marked upregulation of p-S345 Chk1 accompanied by defects in mitotic signaling. Together, these results establish proof-of-concept antitumor efficacy through PARP6 inhibition and highlight a novel function of PARP6 in maintaining centrosome integrity via direct ADP-ribosylation of Chk1 and modulation of its activity. SIGNIFICANCE: These findings describe a new inhibitor of PARP6 and identify a novel function of PARP6 in regulating activation of Chk1 in breast cancer cells.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
AZ0108 AZ0108 is a PARP6 inhibitor, with additional activity against PARP1/2, which induces mitotic defects leading to apoptosis, and inhibits cell proliferation and tumor growth (PMID: 30297535).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
Unknown unknown breast cancer not applicable AZ0108 Preclinical - Cell line xenograft Actionable In a preclinical study, AZ0108 induced mitotic defects, apoptosis, and inhibited growth in breast cancer cell lines in culture, and inhibited tumor growth in cell line xenograft models (PMID: 30297535). 30297535