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6 protocols using bemcentinib

1

Cell Line Authentication and Drug Screening

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All cell lines used in this study (H358, MIA PaCa-2, and H23) were obtained from the American Type Culture Collection and authenticated by the University of California (UC) Berkeley DNA Sequencing Facility using short tandem repeat DNA profiling. Cells were maintained in Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% (v/v) fetal bovine serum, penicillin (100 U/ml), and streptomycin (100 μg/ml). All cells were grown at 37°C in 5% CO2. All cells were tested for Mycoplasma contamination using the MycoAlert PLUS Mycoplasma Detection Kit (Lonza) before initiation of experiments. ARS-1620 was obtained by custom synthesis from Pharmaron. Erlotinib and palbociclib were obtained from LC Laboratories, AZD4547 and buparlisib were obtained from MedChem Express, and SHP099 and bemcentinib were obtained from Selleckchem. ARS-1323-alkyne was synthesized as described below. Recombinant human EGF and FGF2 (FGF-basic) were obtained from Thermo Fisher Scientific. TAMRA-N3 and tris(benzyltriazolylmethyl)amine (TBTA) were obtained from Click Chemistry Tools. Tris(2-carboxyethyl)phosphine (TCEP) and CuSO4 were obtained from Sigma-Aldrich.
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2

Cell Invasion Assay with Bemcentinib

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25,000 single cells were resuspended in serum-free RPMI with or without 0.25 µM of bemcentinib (BGB324) or 0.25 µM of barasertib (both from Selleck Chem, Houston, TX). Next, cells were seeded on top of a 8 µm filter membrane within a 24-well transwell insert (Corning, New York City, NY). C/RPMI was added to the bottom of wells of 24-well Falcon TC Companion Plate (Corning, New York City, NY). After 72hrs, inserts were removed, washed with PBS and the upper surface of the membrane was scrubbed twice using cotton tipped swab to remove non-invading cells. To quantify invaded cells, the exterior bottom of each insert was fixed and stained with 25% methanol and 0.5% crystal violet solution for 5 mins. After washing of the inserts with excess distilled water and air-drying, the membranes were carefully removed using scalpel blades and mounted onto glass slides with coverslips. Slides were visualized and digital images recorded using a Nikon Eclipse 80i microscope with DS-Ri2 camera (Nikon, Tokyo, Japan) at 20x optical magnification. Cell invasion area was determined by quantifying the area with crystal violet staining using the ImageJ software.
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3

Establishment of an in vitro blood-brain barrier model

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All-trans RA (#0695) and A83-01 (#2939) were obtained from Tocris (Bristol, UK). FGF2 (#AF-100-18B) was obtained from PeproTech (Rocky Hill, NJ, USA). Matrigel Growth Factor Reduced (GFR) (#354230) was obtained from Corning (Corning, NY, USA). Fibronectin (#86088-83-7) was obtained from Fujifilm Wako (Osaka, Japan). Collagen type IV (#638-05921) was obtained from Nitta gelatin (Osaka, Japan). Accutase was obtained from Nacalai Tesque (Kyoto, Japan). ACE2 neutralizing antibody (#AF933, ACE2 inhibitor) was obtained from R&D Systems (Minneapolis, MN, USA). Bemcentinib (#S2841, AXL inhibitor) and CHIR99021 (#S1263) were obtained from Selleck Chemicals (Houston, TX, USA). Meplazumab (#MA5-42304, CD147 inhibitor) and penicillin–streptomycin mixture (#15140122, PS) were obtained from Thermo Fisher Scientific (Waltham, MA, USA). EG00229 (#HY-10799, NRP1 inhibitor) was obtained from MedChemExpress (NJ, USA). Stock concentrations and solvents for chemicals were described in Table 1. All other reagents were of analytical grade and obtained from commercial sources.

Medium components used in the BBB studies

ReagentStock concentrationSolvent
All-trans RA40 mMDMSO
A83-0110 mMDMSO
FGF2100 µg/mLwater
CHIR9902130 mMDMSO
ACE2 Ab200 µg/mLPBS
Bemcentinib10 mMDMSO
Meplazumab930 µg/mLPBS
EG00229100 mMDMSO
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4

AXL Knockout Cell Lines for Drug Evaluation

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Cells were provided by the Moffitt Lung Cancer Center of Excellence Cell Line Core. The H1299 AXL KO and PC9 AXL KO cells were developed in the Meyer lab at UCLA. Cells were confirmed to be free of mycoplasma (PlasmoTest, Invivogen) and authenticated by short tandem repeat (STR) analysis (ACTG Inc.). RXDX106, Bemcentinib and Cabozantinib were purchased from Selleckchem, dissolved in DMSO at 10 mM concentration and diluted as necessary.
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5

CCl4-Induced Liver Injury Model

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Wild-type C57BL/6 8- to 10-week-old male mice (Charles River, UK) were administered 0.4 mL/kg CCl4 (Sigma-Aldrich), diluted in olive oil (Sigma-Aldrich) at a 1:3 ratio. Mice were injected intraperitoneally twice a week for total of 6 weeks (n = 13 intraperitoneal CCl4 injections). In addition, a group of wild-type mice were administered bemcentinib (Selleckchem, cat. #S2841) intraperitoneally at 100 mg/kg dose 4 times over the last week before death. Twenty-four hours after the last CCl4 injection, mice were killed, livers were perfused with PBS, and liver tissue was FFPE for fluorescent immunohistochemistry analysis. All animal experimental protocols were approved by Imperial College London in accordance with UK Home Office regulations (PPL numbers: 70/7578 and P8999BD42).
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6

Pharmacological Inhibition of TGFBR1 and AXL

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The TGFBR1 inhibitor, galunisertib (LY2157299), and the AXL inhibitor, bemcentinib (R428), were purchased by Selleckchem. Drugs were dissolved in sterile dimethylsulfoxide (DMSO) at a 10 mM stock solution concentration and stored in aliquots at − 20 °C.
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