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OSI-420

Name: OSI-420
Brand: Selleck Chemicals
SKU: S2205
Rating: 5 (19 reviews)

Catalog No.S2205 Synonyms: DesMethyl Erlotinib (CP-473420) HCl

For research use only.

OSI-420 (DesMethyl Erlotinib, CP-473420) is the active metabolite of Erlotinib (EGFR inhibitor with IC50 of 2 nM).

CAS No. 183320-51-6

Selleck's OSI-420 has been cited by 19 publications

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EGFR Signaling Pathway Map

Biological Activity

Description

OSI-420 (DesMethyl Erlotinib, CP-473420) is the active metabolite of Erlotinib (EGFR inhibitor with IC50 of 2 nM).

Features

OSI 420 is a major active metabolite of Erlotinib.

Targets

EGFR ^[1]

2 nM

In vitro

OSI-420 is the major metabolite of Erlotinib in human plasma. Erlotinib disappearance from plasma after a short IV infusion is biexponential with a mean terminal half-life of 5.2 h and a mean clearance of 128 ml/min per m(2). OSI-420 exposure (AUC) in plasma is 30% (range 12-59%) of erlotinib, and OSI-420 clearance is more than 5-fold higher than erlotinib. Erlotinib and OSI-420 are equipotent, and the combined concentrations of erlotinib + OSI-420 achieved in the CSF exceeded the IC50 (7.9 ng/ml or 20 nM) for the EGFR tyrosine kinase inhibition in intact tumor cells. ^[1] Erlotinib potently inhibits EGFR activation in intact cells including HNS human head and neck tumor cells (IC50 20nM), DiFi human colon cancer cells andMDA MB-468 human breast cancer cells. Erlotinib (1 μM) induces apoptosis in DiFi human colon cancer cells. ^[2] Erlotinib inhibits growth of a panel of NSCLC cell lines including A549, H322, H3255, H358 H661, H1650, H1975, H1299, H596 with IC50 ranging from 29 nM to >20 μM. ^[3] Erlotinib(2 μM) significantly inhibits growth of AsPC-1 and BxPC-3 pancreatic cells. ^[4] The effects of Erlotinib HCl in combination with gemcitabine are considered additive in KRAS-mutated pancreatic cancer cells. Ten micromolar of Erlotinib inhibits EGFR phospho-rylation at the Y845 (Src-dependent phosphorylation) and Y1068 (auto-phosphorylation) sites. ^[5] Combination with Erlotinib could down-modulate rapamycin-stimulated Akt activity and produces a synergistic effect on cell growth inhibition. ^[6]

In vivo

At doses of 100 mg/kg, Erlotinib completely prevents EGF-induced autophosphorylation of EGFR in human HN5 tumors growing as xenografts in athymic mice and of the hepatic EGFR of the treated mice. ^[1] Erlotinib reduces the growth of xenografted human AML cells. ^[4]

Protocol (from reference)

Kinase Assay: ^[1]	Kinase Assays: 96-well plates are coated by incubation overnight at 37 °C with 100 μL per well of 0.25 mg/mL PGT in PBS. Excess PGT is removed by aspiration, and the plate is washed 3 times with washing buffer (0.1% Tween 20 in PBS). The kinase reaction is performed in 50 μL of 50 mM HEPES (pH 7.3), containing 125 mM sodium chloride, 24 mM magnesium chloride, 0.1 mM sodium orthovanadate, 20 μM ATP, 1.6 μg/mL EGF, and 15 ng of EGFR, affinity purified from A431 cell membranes. Erlotinib HCl in DMSO is added to give a final DMSO concentration of 2.5%. Phosphorylation is initiated by addition of ATP and proceeded for 8 minutes at room temperature, with constant shaking. The kinase reaction is terminated by aspiration of the reaction mixture and is washed 4 times with washing buffer. Phosphorylated PGT is measured by 25 minutes of incubation with 50 μL per well HRP-conjugated PY54 antiphosphotyrosine antibody, diluted to 0.2 μg/mL in blocking buffer (3% BSA and 0.05% Tween 20 in PBS). Antibody is removed by aspiration, and the plate is washed 4 times with washing buffer. The colonmetric signal is developed by addition of TMB Microwell Peroxidase Substrate, 50μL per well, and stopped by the addition of 0.09 M sulfuric acid, 50 μL per well. Phosphotyrosine is estimated by measurement of absorbance at 450 nm. The signal for controls is typically 0.6-1.2 absorbance units, with essentially no back ground in wells without AlP, EGFR, or PGT and is proportional to the time of incubation for 10 minutes.
Cell Research: ^[3]	Cell lines: A549, H322, H3255, H358 H661, H1650, H1975, H1299, H596 cells Concentrations: 30 nM-20 μM Incubation Time: 72 hour Method: Exponentially growing cells are seeded in 96-well plastic plates and exposed to serial dilutions of erlotinib, pemetrexed, or the combination at a constant concentration ratio of 4:1 in triplicates for 72 h. Cell viability is assayed by cell count and the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Growth inhibition is expressed as the percentage of surviving cells in drug-treated versus PBS-treated control cells (which is considered as 100% viability). The IC50 value is the concentration resulting in 50% cell growth inhibition by a 72-h exposure to drug(s) compared with untreated control cells and is calculated by the CalcuSyn software.
Animal Research: ^[7]	Animal Models: Male 5-week-old BALB-nu/nu mice with HPAC Dosages: 50 mg/kg Administration: Oral administration

References

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Solubility (25°C)

In vitro

Chemical Information

Molecular Weight	415.87
Formula	C₂₁H₂₁N₃O₄.HCl
CAS No.	183320-51-6
Storage	3 years	-20°C	powder
Storage	2 years	-80°C	in solvent
Smiles	COCCOC1=C(C=C2C(=C1)N=CN=C2NC3=CC=CC(=C3)C#C)OCCO.Cl

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In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

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Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
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Molarity Calculator

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Clinical Trial Information

NCT Number	Recruitment	Interventions	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT00124657	Completed	Drug: Erlotinib hydrochloride	Brain and Central Nervous System Tumors	St. Jude Children''s Research Hospital\|Rady Children''s Hospital San Diego\|Duke University	March 2005	Phase 1\|Phase 2

(data from https://clinicaltrials.gov, updated on 2022-08-01)

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