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36 protocols using palbociclib

1

Palbociclib Dosage and Administration

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Palbociclib was obtained from Pfizer Inc. Palbociclib powder was stored at room temperature and protected from light.
For in vitro experiments, a 2.5 mM stock of Palbociclib was prepared in DMSO and stored as single use aliquots at -80ºC.
For in vivo experiments, Palbociclib was dissolved in Sodium L-Lactate (Sigma-Aldrich; St. Louis, MO) buffer (50mM, pH 4.0). Cre:ER T+/-PTEN f/f mice were given a single daily dose of 100 mg/kg of Palbociclib by oral gavage, starting two weeks after tamoxifen injection. For Palbociclib acute treatment, Cre-ER T+/-PTEN fl/fl animals were treated for three consecutive days with 75, 100 or 150 mg/kg of the inhibitor. For survival experiments, mice received 5 doses per week until the moment of sacrifice. In each experiment, control animals were given vehicle following the same schemes.
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2

Culturing Breast Cancer Cell Lines

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MCF7 (ATCC HTB-22) and T47D (ATCC HTB-133) human breast cancer cells were obtained from ATCC and cultured in phenol red–free RPMI 1640 medium supplemented with 10% fetal bovine serum (FBS, Euroclone), 2 mmol/L glutamine and 1 nmol/L 17β-estradiol (E2, Sigma). The corresponding LTED derivatives were maintained in a sterol-deprived medium in phenol red–free RPMI 1640 medium containing 10% dextran charcoal-stripped FBS (Hyclone) and 2 mmol/L glutamine (DCC medium). The palbociclib-resistant derivatives (PalboR) were cultured in in DCC medium in the presence of 1 µM palbociclib (Pfizer, Pfizer Italia, Latina, Italy). Cells were short tandem repeat tested, amplified, stocked, routinely subjected to mycoplasma testing and once thawed were kept in culture for a maximum of 20 passages.
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3

KRAS-mutant NSCLC Cell Line Profiling

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KRAS-mutant NSCLC cell lines were authenticated and maintained in the recommended medium. Palbociclib (PD0332991) and PD0325901 were supplied by Pfizer. Trametinib, binimetinib, ulixertinib, everolimus, MK2206, erlotinib, LY2874455 and LMN-211904 were obtained from Selleckchem, and bFGF neutralizing antibody was obtained from Sigma. For depletion experiments, pLKO.1 shRNA constructs targeting CDK1, CDK2, CDK4, CDK6, cyclin D1, cyclin D3 and cyclin E (Harvard PlasmID Database) were expressed by lentiviral infection. Palbociclib-resistant cells H358-PR100, H358-PR250, H460-PR500 and H441-PR500 were isolated after the serial addition of increasing concentrations of Palbociclib to culture media. Resistance was confirmed by assessment of proliferation and cell cycle analysis in the presence of Palbociclib. Cell viability assays were performed using CellTiter-Glo (Promega) starting with 1 × 103 cells in 96-well plates.
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4

Cytotoxicity Evaluation of Palbociclib

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- Palbociclib was obtained from Pfizer, Freiburg, Germany.
- Urea, Britton-Robinson buffer, and methanol were purchased from Sigma Aldrich (St. Louis, MO, USA).
- HepG2 cell line was obtained from Nawah Scientific Company, Egypt.
- All materials and reagents were of analytical grade.
- Double distilled water was utilized throughout the work.
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5

Regulation of DUB3 by CDK Phosphorylation

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Example 11

It was tested whether other CDKs could directly phosphorylate DUB3. Bacterially-expressed GST-DUB3 WT and GST-DUB3 S41A fusion polypeptides were incubated with active CDK4, CDK6, CDK1 or CDK2 in the presence of [γ-32P]ATP. As shown in FIG. 15A, CDK1 directly phosphorylated DUB3 in vitro. Cells were transfected with FLAG-DUB3 WT, and were treated with a pan CDK inhibitor (Roscovitine) or a selective inhibitor of CDK 4/6, PD0332991 (Palbociclib, Pfizer). CDK inhibition dramatically reduced the phosphorylation of DUB3 at Ser41 (FIG. 15B).

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6

Palbociclib and Notch Pathway Modulation in Gastric Cancer

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The AGS and HGC-27 GC cell lines were obtained from the American Type Culture Collection. All cells were cultured in RPMI-1640 medium (Sigma-Aldrich; Merck KGaA) containing 10% fetal bovine serum (Gibco; Thermo Fisher Scientific, Inc.) and 1% penicillin/streptomycin (HyClone; Cytiva) and maintained at 37°C in a humidified incubator containing 5% CO2. Palbociclib was purchased from Pfizer (PD0332991), dissolved in DMSO and added into the culture medium at the indicated concentration. Cells were exposed to drug treatment for 2 days at 37°C, unless otherwise indicated. Cells were randomly divided into seven groups: i) Control (0 µM Palbociclib); ii) 0.25 µM Palbociclib; iii) 0.5 µM Palbociclib; iv) 1 µM Palbociclib; v) 2 µM Palbociclib; vi) 4 µM Palbociclib and vii) 0.5 µM Palbociclib + 10 µM Jagged-1/FC. The activator of Notch pathway (Jagged-1/FC) was supplied by Abcam.
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7

Modeling Ph+ ALL in NOD/SCID-IL-2Rγ-null Mice

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Ph+ ALL cells (2×106 cells/mouse) were injected intravenously in 6–8 weeks old NOD/SCID-IL-2Rγ-null mice (Jackson Laboratory). Doxycycline was administered at 2 g/L in the drinking water starting 7 days post injection. Peripheral blood leukemic cells were monitored by flow cytometry detection of GFP, human CD10 and/or CD19 (based on cell type specific expression). For immunoblot analysis, leukemic cells were purified from murine cells by FACS or with the EasySep™ Mouse/Human Chimera Isolation Kit (StemCell Technologies). Palbociclib (obtained by Pfizer) was dissolved at 15 mg/mL in 50 mM sodium lactate, pH = 4.0 and given by oral gavage for 10 consecutive days at 150 mg/kg. Sabutoclax (SelleckChem) was dissolved at 0.5 mg/mL in 10:10:80 Kolliphor-EL (Sigma-Aldrich)-ethanol-PBS and administered intraperitoneally every other day at 5 mg/kg for a total of five doses. Animal experiments were approved by Thomas Jefferson University IACUC under protocol number 00012.
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8

Synergistic effects of cell-cycle inhibitors

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Palbociclib was obtained from Pfizer (New York City, NY, USA). Danusertib (PHA-739358), alisertib (MLN8237), tozasertib (VX-680), CCT137690, everolimus (RAD001), MK-2206 2HCl, and ipatasertib (GDC-0068) were purchased from Selleckchem (Houston, TX, USA). For dose–response curves and synergy matrixes, cells were plated in triplicates in 96-well plates. ATP content was measured using CellTiterGlo (Fitchburg, WI, USA) according to the manufacturer’s instructions. IC50 determination was performed using GraphPad®. The percentage deviation from Bliss independency model [44 (link)] was determined via the following formula: Exy = Ex + Ey − (ExEy). E represents the effect on viability of drugs x and y, expressed as a percentage of the maximum effect. Cell cycle profiles were obtained by staining cells with propidium iodide (50 μg/mL) in hypotonic lysis solution (0.1% (w/v) sodium citrate, 0.1% (v/v) Triton X-100, 100 μg/mL RNAse) and incubating at 37 °C for 30 min before measurement via FACS.
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9

Evaluating ESR1 Ligands and Inhibitors

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ESR1 ligands included 17β-estradiol (Sigma), ICI 182,780 (Tocris), and 4-hydroxytamoxifen (Sigma). Palbociclib, pipendoxifene and bazedoxifene were provided by Pfizer. (S)-3-(3-hydroxyphenyl)-4-methyl-2-(4-((S)-2-((R)-3-methylpyrrolidin-1-yl)propoxy)phenyl)-2H-chromen-6-ol (BPN1) and (E)-3-(4-((E)-2-(2-chloro-4-fluorophenyl)-1-(1H-indazol-5-yl)but-1-en-1-yl)phenyl)acrylic acid (BPL2) were synthesized as described (14 , 15 ). Ligands were dissolved in ethanol or DMSO.
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10

Preparation of Trametinib and Palbociclib

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Trametinib was purchased from LC Laboratories (Woburn, MA). Palbociclib was obtained under a Material Transfer Agreement from Pfizer Global R & D. For cellular studies, drugs were dissolved in DMSO at a concentration of 10mM and stock solutions stored at −20°C.
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