Background
Methods
Cell culture
Chemical compounds
Protein extractions
Western blotting
CyQuant assay
RT-qPCR
Human gene/mRNA | Orientation | Oligonucleotide Sequence (5’ to 3’) |
---|---|---|
18 s rRNA | Forward | CAGCCACCCGAGATTGAGCA |
18 s rRNA | Reverse | TAGTAGCGACGGGCGGTGTG |
FOXM1 | Forward | GCAGGCTGCACTATCAACAA |
FOXM1 | Reverse | TCGAAGGCTCCTCAACCTTA |
CCNB1 | Forward | AACTTTCGCCTGAGCCTATTTT |
CCNB1 | Reverse | TTGGTCTGACTGCTTGCTCTT |
SKP2 | Forward | GGTGTTTGTAAGAGGTGGTATCGC |
SKP2 | Reverse | CACGAAAAGGGCTGAAATGTTC |
CDC25B | Forward | CCTCCGAATCTTCTGATGCAG |
CDC25B | Reverse | GCGTCTGATGGCAAACTGC |
Time course analysis of FOXM1 mRNA and protein expression after NB compound treatment
Drug washout study
Incucyte analysis
Cell cycle analyses
Caspase-3/7 activity assay
Two-dimension (2D) and three-dimension (3D) colony formation assay
Drug synergy assessment
NB-73 or NB-115 | Carboplatin | Olaparib |
---|---|---|
16.4 nM | 0.36 µM | 1.6 µM |
41 nM | 0.9 µM | 4.1 µM |
102 nM | 2.3 µM | 10.2 µM |
256 nM | 5.7 µM | 25.6 µM |
640 nM | 14 µM | 64 µM |
1.6 µM | 35 µM | 160 µM |
4 µM | 88 µM | 400 µM |
10 µM | 222 µM | 1000 µM |
Study replication and statistics
Results
Potency, efficacy, and tumor cell selectivity of FOXM1 inhibitors in HGSOC cells
Compound | HGSOC cell line | |||
---|---|---|---|---|
CAOV3 | OVCAR4 | |||
Potency [IC50 (µM)] | % Efficacy (maximum dose) | Potency [IC50 (µM)] | % Efficacy (maximum dose) | |
FDI-6b | 9.1 | 61% (20 μM) | 4.7 | 61% (20 μM) |
Monensin | 0.10 | 100% (10 μM) | 0.024 | 52% (10 μM) |
NB-55 | 3.0 | 89% (10 μM) | 3.2 | 96% (10 μM) |
NB-73 | 0.60 | 98% (10 μM) | 0.34 | 86% (10 μM) |
NB-115 | 0.49 | 100% (10 μM) | 0.56 | 85% (10 μM) |
N-phenylphenanthren- 9-amine (NP9) | 23 | 85% (100 μM) | 39 | 100% (100 μM) |
RCM-1c | n/dd | 0% (50 μM) | n/dd | 0% (50 μM) |
Thiostrepton | 0.62 | 93% (2.5 μM) | 0.98 | 99% (2.5 μM) |
Cell Line | |||||||
---|---|---|---|---|---|---|---|
Compound | CAOV3 | OVCAR4 | FT282-C11 | Fold HGSOC cell selectivityc | |||
IC50 (µM) | Efficacy | IC50 (µM) | Efficacy | IC50 (µM) | Efficacy | ||
FDI-6b | 9.1 | 61% | 4.7 | 61% | 11 | 76% | 1.6 |
NB-55 | 3.0 | 89% | 3.2 | 96% | 2.8 | 96% | 0.90 |
NB-73 | 0.60 | 98% | 0.34 | 86% | 6.0 | 81% | 13 |
NB-115 | 0.49 | 100% | 0.56 | 85% | 3.8 | 100% | 7.2 |
Thiostrepton | 0.62 | 93% | 0.98 | 99% | 0.73 | 100% | 0.91 |
NB compounds suppress FOXM1, FOXM1-P, and FOXM1 targets in HGSOC cell lines.
NB compounds target FOXM1 protein and promote FOXM1 proteasomal degradation in HGSOC cell lines
NB compound treatment leads to sustained suppression of FOXM1 in HGSOC cell lines
Kinetic analysis of cell proliferation and cell death following NB compound treatment
NB compounds alter HGSOC cell cycle in a cell line dependent manner
NB compound treatment promotes apoptotic cell death in HGSOC cells
FOXM1 suppression is independent of apoptosis in NB compound treated HGSOC cells
NB compounds inhibit two-dimensional and three-dimensional HGSOC cell colony formation
NB compounds synergize with carboplatin to inhibit HGSOC cell viability
Combination | Cell Line | ED75 | ED90 | ED95 | CI Averageb |
---|---|---|---|---|---|
Carboplatin + NB-73 (Simultaneous Treatment) | CAOV3 | 1.09 | 0.63c | 0.44c | 0.72c |
OVCAR4 | 1.23 | 0.75c | 0.54c | 0.84c | |
Carboplatin + NB-115 (Simultaneous Treatment) | CAOV3 | 2.25 | 1.57 | 1.23 | 1.68 |
OVCAR4 | 0.94c | 0.59c | 0.43c | 0.65c | |
Carboplatin + NB-73 (Sequential Treatment) | CAOV3 | 1.10 | 0.56c | 0.36c | 0.68c |
OVCAR4 | 1.17 | 0.60c | 0.38c | 0.72c | |
Carboplatin + NB-115 (Sequential Treatment) | CAOV3 | 1.67 | 0.95c | 0.64c | 1.31 |
OVCAR4 | 1.18 | 0.50c | 0.28c | 0.65c |