MLN8237 (Alisertib)

Aurora A inhibition rescues the PPP6C depletion phenotype. (A) HeLa cells transfected for 48 h with control and PPP6C si08 duplexes were treated with 10 or 20 nM MLN8237 or a solvent control for 15 min before lysis in phosphatase inhibitor containing buffer or fixation. Total lysates were analyzed by Western blotting. The red and black lines indicate the hosphorylated and nonphosphorylated forms of Aurora A. Fixed cells were stained using DAPI to detect DNA and antibodies to α-tubulin and Aurora A pT288. The intensity of pT288 staining was integrated using ImageJ over the spindle region defined by TPX2 staining and is plotted in the bar graph ( n = 4). Arrowheads indicate micronuclei. Bar, 5 µm. (B) HeLa cells transfected for 48 h with control and PPP6C si08 duplexes were treated with 10 nM MLN8237 or a solvent control for 24 h before fixation and staining with DAPI to detect DNA.

J Cell Biol, 2010, 191(7), 1315-32. MLN8237 (Alisertib) purchased from Selleck

C, Fry depletion decreases the level of Thr-210 phosphorylation of Plk1 on spindle poles. HeLa cells transfected with siRNAs were cultured in growth medium for 12 h and in thymidine-containing medium for 36 h. They were then released from thymidine arrest for 12 h before being fixed and stained with anti-Plk1 pT210 ( green) and anti-pericentrin (red) antibodies. DNA was stained with TO-PRO-3 ( blue ). For Aurora A inhibition, after release from thymidine block for 10 h, HeLa cells transfected with control siRNA were incubated for2h in medium containing MLN8237 (100 nM) and MG132 (10 μM). Magnified images of the white boxes are also shown. Scale bar ,5 μm.

J Biol Chem, 2012, 287(33), 27670-81. MLN8237 (Alisertib) purchased from Selleck

Eg5 inhibition counteracts the induction of spindle pole fragmentation by Aurora-A inactivation. The protocol to inhibit Aurora-A by MLN8237 in cells progressing towards mitosis is depicted (time intervals not represented to scale). Control cultures were treated with solvent (DMSO) in the same time window. When indicated, MON was added 1 hour before harvesting. Note the absence of active phosphorylated (pThr288) Aurora-A (in red in IF panels) in cells treated with MLN8237. Upper histograms represent the percentage of all spindle and MT abnormalities in control and MLN8237-treated cultures (200 counted PM/M per condition in 2 experiments); the grey fraction of the histograms represents mitoses with spindle extrapoles, while other defects (monopolar or disorganised spindles, few and short MTs) are in white. Lower histograms and IF panels show that concomitant Eg5 inhibition by MON prevents MLN8237-induced spindle pole fragmentation (note the failure of centrosome migration reflecting Eg5 inactivation in lower IF panels). 200 PM/M per condition were counted in 2 experiments. Error bars represent s.d. **: p < 0.001, χ2 test. Red asterisks indicate significant differences with respect to DMSO controls, and black asterisks significant differences between Aurora-Ai mitoses with active or inactive Eg5. Scale bar: 10 μm

Mol Cancer, 2011, 10, 131. MLN8237 (Alisertib) purchased from Selleck

Recruitment of clathrin to the mitotic spindle is controlled by phosphorylation of TACC3 by Aurora-A kinase. Representative micrographs of HEK293 cells incubated with 0.3 μM MLN8237 for 40 min. Cells were fixed and stained as indicated.

EMBO J, 2011, 30(5), 906-19. MLN8237 (Alisertib) purchased from Selleck

Inhibition of Aurora A (12.5 nM) by MLN8054 or MLN8237 was assessed in duplicate radiometric assays containing 100 μM [γ-32P] ATP and quantified by p81 phosphocellulose assay and scintillation counting. Kinase activity is reported as a percentage of control calculated from duplicate incubations containing 2.5% (v/v) DMSO. IC50 values represent the mean ±SEM calculated from two independent experiments.

ACS Chem Biol , 2010, 5, 563-576. MLN8237 (Alisertib) purchased from Selleck

The effects of T217D and T217N Aurora A mutations were directly compared to WT Aurora A-expressing cells. Each well was treated with either DMSO or 500 nM MLN8054 (E), or 30 nM MLN8237 (F) on day one of the experiment and cells were cultured for 8 days, at which point they were fixed. For all colony assays, an area encompassing >90 % of the colonies per dish is shown. Similar results were seen in two independent duplicate experiments.

ACS Chem Biol , 2010, 5, 563-576. MLN8237 (Alisertib) purchased from Selleck

NUSAP mitotic phosphorylation at Ser 240 correlates with Aurora A activity. Protein samples of FLAG-NUSAP immunoprecipitated from I, M and MtMLN or with MtZM were analysed using LC-MS/MS, focusing on the predicted phosphorylated residue Ser 240. The histograms (A, B) show the calculated ratios based on peptides carrying the phosphorylated Ser 240 compared with all matched peptides containing this residue.

EMBO reports , 2010, 11, 977-984. MLN8237 (Alisertib) purchased from Selleck