For research use only.
CAS No. 1140964-99-3
Stenoparib (E7449) is an orally bioavailable, brain penetrable, small molecule dual inhibitor of PARP1/2 and also inhibits PARP5a/5b, otherwise known as tankyrase1 and 2 (TNKS1/2), important regulators of canonical Wnt/β-catenin signaling. It has IC50 values of 1.0 and 1.2 nM for PARP1 and 2, respectively.
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|Description||Stenoparib (E7449) is an orally bioavailable, brain penetrable, small molecule dual inhibitor of PARP1/2 and also inhibits PARP5a/5b, otherwise known as tankyrase1 and 2 (TNKS1/2), important regulators of canonical Wnt/β-catenin signaling. It has IC50 values of 1.0 and 1.2 nM for PARP1 and 2, respectively.|
E7449 inhibits PARP enzymatic activity and additionally traps PARP1 onto damaged DNA; a mechanism previously shown to augment cytotoxicity. E7449 inhibits Wnt/β-catenin signaling in colon cancer cell lines, likely through TNKS inhibition. E7449 stabilizes axin and TNKS proteins resulting in β-catenin de-stabilization and significantly alters expression of Wnt target genes. E7449 inhibits TNKS1 and 2 (PARP5a and 5b) with IC50 values of 50-100 nmol/L. Significant inhibitory activity is not observed for PARP3 or PARPs 6-16 (PARP9 and 13 lack activity and PARP4 had minimal signal).
|In vivo||Chemotherapy is potentiated by E7449 and single agent has significant antitumor activity in BRCA-deficient xenografts. E7449 lacks single agent antitumor activity in vivo. E7449 antitumor activity is increased through combination with MEK inhibition. Treatment with E7449 at 30 or 100 mg/kg in xenografts is well-tolerated without any significant body weight loss or deaths. Treatment with E7449 at 100 mg/kg resulted in significant PARP inhibition that is sustained for at least 12 hours and recovered to basal levels within 24 h.|
|In vitro||DMSO||4 mg/mL warmed (12.6 mM)|
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Clinical Trial Information
|NCT Number||Recruitment||interventions||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02396433||Withdrawn||Drug: Carboplatin|Drug: Eribulin|Drug: E7449||Cancer of the Breast||The University of Texas Health Science Center at San Antonio||April 2015||Phase 1|Phase 2|
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