Home Blog of Signal Transduction Epigenetics NSD AZD5153 reverses palbociclib resistance in ovarian cancer by inhibiting cell cycle-related proteins and the MAPK/PI3K-AKT pathway

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AZD5153 reverses palbociclib resistance in ovarian cancer by inhibiting cell cycle-related proteins and the MAPK/PI3K-AKT pathway

The CDK4/6 inhibitor, palbociclib has recently entered clinic-trial stage for breast cancer treatment. However, translating its efficacy to other solid tumors has been challenging, especially for aggressive solid tumors. We found that the effect of palbociclib as a single agent was limited due to primary and acquired resistance in multiple ovarian cancer (OC) models. Among these, patient-derived organoid and xenograft models are two most representative models of drug responsiveness in patients with OC. In preclinical models, this study demonstrated that activated MAPK/PI3K-AKT pathway and cell cycle-related proteins induced the resistance to palbociclib, which was overcome by the addition of the bromodomain protein 4 (BRD4) inhibitor AZD5153. Moreover, this study revealed that AZD5153 and palbociclib had a synergistic lethal effect on inducing the cell cycle arrest and increasing apoptosis, even in RB-deficient cell lines. Based on these results, it is anticipated that this class of drugs, including AZD5153, which inhibit the cell cycle-related protein and MAPK/PI3K-AKT pathway, will exhibit synergistic effects with palbociclib in OC.

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Cat.No. Product Name Information
S8344 AZD5153 6-hydroxy-2-naphthoic acid AZD5153 6-hydroxy-2-naphthoic acid (HNT salt) is a potent, selective, and orally available BET/BRD4 bromodomain inhibitor with pKi of 8.3 for BRD4. AZD5153 inhibits the expression of Nuclear receptor binding SET domain protein 3 (NSD3) target genes. NSD3, via H3K36me2, acts as an epigenetic deregulator to facilitate the expression of oncogenesis-promoting genes.

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