Journal
BIOMEDICINES
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/biomedicines9101410
Keywords
TNBC; ONC201; MEK inhibitor; apoptosis; trametinib
Categories
Funding
- MD Anderson Morgan Welch Inflammatory Breast Cancer Research Program
- State of Texas Rare and Aggressive Breast Cancer Research Program
- NIH/NCI [P30CA016672]
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The study showed that a combination therapy of ONC201 with MEK inhibitor can effectively inhibit the growth of triple-negative breast cancer cell lines, with ClpP levels correlating with ONC201 efficacy. Three-dimensional RNA interference screening identified MAPK and PI3K/Akt pathways as potential synergistic therapeutic partners.
Triple-negative breast cancer (TNBC) is a heterogeneous group of estrogen, progesterone, and HER2-negative breast cancers with poor clinical outcomes. The imipridone ONC201 is a G-protein-coupled dopamine receptor D2 modulator and an allosteric agonist of the mitochondrial protease caseinolytic protease P(ClpP), which induces apoptosis. Here, we aimed to develop a novel ONC201-based combination therapy targeting TNBC. We performed a reverse-phase protein array analysis of ONC201-treated/-untreated and -sensitive/-resistant cell lines to identify potential predictive biomarkers. A principal component analysis using measured protein expression levels, the apoptosis score (AS), and heatmaps of all the measured protein and AS-related protein expression levels did not show a clear correlation between the expression levels of a specific protein and ONC201 efficacy. Three-dimensional RNA interference kinome-wide library screening revealed the MAPK and PI3K/Akt pathways as potential synergistic therapeutic partners. The combination with the MEK inhibitor trametinib successfully inhibited the growth of both ONC201-sensitive/-resistant TNBC cell lines. The baseline ClpP level correlated with the efficacy of single-agent ONC201. Single and combination therapy increased caspase 3/7 activity. The predictive biomarkers and a detailed mechanism of synergy beyond an induction of caspase activation should be tested for translation into future studies.
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