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Omipalisib (GSK2126458) PI3K inhibitor

Name: Omipalisib (GSK2126458)
Brand: Selleck Chemicals
SKU: S2658
Availability: InStock
Rating: 5 (60 reviews)

Cat.No.S2658

Omipalisib (GSK2126458, GSK458) is a highly selective and potent inhibitor of p110α/β/δ/γ, mTORC1/2 with K_i of 0.019 nM/0.13 nM/0.024 nM/0.06 nM and 0.18 nM/0.3 nM in cell-free assays, respectively. This compound induces autophagy. Phase 1.

Chemical Structure

Molecular Weight: 505.5

Jump to Mechanism of Action Cell Culture & Working Concentration Solubility Chemical Information, Storage & Stability Specificity

Quality Control

Batch: Purity: 99.67%

99.67

Related Targets	Akt mTOR AMPK GSK-3 ATM/ATR DNA-PK PDPK1 PTEN PP2A PDK PI4K PIKfyve MELK
Related Products	LY294002 3-Methyladenine (3-MA) Dactolisib (BEZ235) Pictilisib (GDC-0941) Wortmannin (SL-2052) Buparlisib (BKM120) PI-103 TGX-221 ZSTK474 A66 PF-04691502 PIK-75 HCl IC-87114 740 Y-P (PDGFR 740Y-P) AS-605240 Taselisib (GDC 0032) SAR405 Apitolisib (GDC-0980) VPS34-IN1 PIK-90 AZD6482 Gedatolisib (PKI-587) HS-173 AS-252424 Eganelisib (IPI-549) VS-5584 (SB2343) GSK2636771 AZD8186 GSK1059615 Pilaralisib (XL147)

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Incubation Time	Activity Description	PMID
HCT116	Cytotoxicity assay	72 hrs	Cytotoxicity against human HCT116 cells after 72 hrs by MTT assay, IC50 = 0.01 μM.	26819001
Bel7404	Cytotoxicity assay	72 hrs	Cytotoxicity against human Bel7404 cells after 72 hrs by MTT assay, IC50 = 0.01 μM.	26819001
MDA-MB-231	Cytotoxicity assay	72 hrs	Cytotoxicity against human MDA-MB-231 cells after 72 hrs by MTT assay, IC50 = 0.13 μM.	26819001
A549	Cytotoxicity assay	72 hrs	Cytotoxicity against human A549 cells after 72 hrs by MTT assay, IC50 = 0.14 μM.	27448924
HCT116	Cytotoxicity assay	72 hrs	Cytotoxicity against human HCT116 cells after 72 hrs by MTT assay, IC50 = 0.154 μM.	27448924
U87MG	Cytotoxicity assay	72 hrs	Cytotoxicity against human U87MG cells after 72 hrs by MTT assay, IC50 = 0.537 μM.	27448924
A549	Cytotoxicity assay	72 hrs	Cytotoxicity against human A549 cells after 72 hrs by MTT assay, IC50 = 0.6 μM.	26819001
TC32	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for TC32 cells	29435139
U-2 OS	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for U-2 OS cells	29435139
A673	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
DAOY	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells	29435139
BT-37	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-37 cells	29435139
RD	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for RD cells	29435139
SK-N-SH	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-SH cells	29435139
NB1643	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB1643 cells	29435139
OHS-50	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	29435139
LAN-5	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for LAN-5 cells	29435139
NB-EBc1	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for NB-EBc1 cells	29435139
SK-N-SH	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-SH cells	29435139
Rh41	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
A673	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for A673 cells)	29435139
BT-37	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for BT-37 cells	29435139
MG 63 (6-TG R)	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for MG 63 (6-TG R) cells	29435139
Rh30	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh30 cells	29435139
Rh30	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh30 cells	29435139
OHS-50	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for OHS-50 cells	29435139
Rh41	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh41 cells	29435139
SJ-GBM2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	29435139
SK-N-MC	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
NB-EBc1	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	29435139
LAN-5	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for LAN-5 cells	29435139
Rh18	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh18 cells	29435139
NB1643	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for NB1643 cells	29435139
SK-N-MC	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-MC cells	29435139
TC32	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for TC32 cells	29435139
Rh18	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh18 cells	29435139
Saos-2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Saos-2 cells	29435139
Click to View More Cell Line Experimental Data

Chemical Information, Storage & Stability

Molecular Weight	505.5	Formula	C₂₅H₁₇F₂N₅O₃S	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	1086062-66-9	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	GSK458			Smiles	COC1=C(C=C(C=N1)C2=CC3=C(C=CN=C3C=C2)C4=CN=NC=C4)NS(=O)(=O)C5=C(C=C(C=C5)F)F

Solubility

In vitro
Batch:

DMSO : 101 mg/mL ( (199.8 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
=	×	×

Dilution Calculator Molecular Weight Calculator

In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	2%DMSO 1 40%PEG300 2 2%Tween80 3 56%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	4.000mg/ml (7.91mM)	Taking the 1 mL working solution as an example, add 20 μL of 200 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 20 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 560 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

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

Dosage: mg/kg Average weight of animals: g Dosing volume per animal:μL Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO + % + % Tween 80 + % ddH₂O

%DMSO+ %

Calculation results:

Working concentration: mg/ml;

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.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Mechanism of Action

Targets/IC₅₀/Ki	p110α ^[1] (Cell-free assay) 0.019 nM(Ki) p110δ ^[1] (Cell-free assay) 0.024 nM(Ki) p110γ ^[1] (Cell-free assay) 0.06 nM(Ki) p110β ^[1] (Cell-free assay) 0.13 nM(Ki) mTORC1 ^[1] (Cell-free assay) 0.18 nM(Ki) mTORC2 ^[1] (Cell-free assay) 0.3 nM(Ki)
In vitro	Omipalisib (GSK2126458) potently inhibits the activity of common activating mutants of p110α (E542K, E545K, and H1047R) found in human cancer with K_i of 8 pM, 8 pM and 9 pM, respectively. ^[1] This compound causes a significant reduction in the levels of pAkt-S473 with remarkable potency in T47D and BT474 cells with IC50 of 0.41 nM and 0.18 nM, respectively. Furthermore, it leads to a G1 cell cycle arrest and produces the inhibitory effect on cell proliferation in a large panel of cell lines, including T47D and BT474 breast cancer lines with IC50 of 3 nM and 2.4 nM, respectively. ^[1]
Kinase Assay	HTRF In vitro Profiling Assays for PI3K Inhibition
Kinase Assay	Compounds are serially diluted (3-fold in 100% DMSO) across a 384-well polypropylene mother plate from column 1 to column 12 and column 13 to column 24, to yield 11 concentrations for Omipalisib (GSK2126458). Columns 6 and 18 contain only DMSO. Once titrations are made, 0.05μL is transferred to a 384-well low-volume assay plate. This assay plate contains three pharmacological controls (known PI3K inhibitors) and 3 assay controls: (1) Enzyme without inhibitor; (2) Buffer minus enzyme, and (3) Buffer minus enzyme plus native PIP3. DMSO is stamped into all wells of columns 6 and 18. PIP3 is added at 40 μM in 1X Reaction buffer (1μL of 200 μM PIP3) to alternating rows of column 18 (wells 18 B, D, F, H, J, L, N, P). The no-enzyme control reactions are run in wells 18 A, C, E, G, I, K, M, O (0.1μL of 100% DMSO). The PI3-Kinase profiling assay is optimized using the HTRF kit. The assay kit contains seven reagents: 1) 4X Reaction Buffer; 2) native PIP2 (substrate); 3) Stop A (EDTA); 4) Stop B (Biotin-PIP3); 5) Detection Mix A (Streptavidin-APC); 6) Detection Mix B (Eu-labeled Anti-GST plus GST-tagged PHdomain); 7) Detection Mix C (KF). PI3Kinase Reaction Buffer is prepared by diluting the stock 1:4 with de-ionized water. Freshly prepared DTT is added at a final concentration of 5 mM on the day of use. Enzyme addition and compound pre-incubation are initiated by the addition of 2.5μL of PI3K (at twice its final concentration) in 1X reaction buffer to all wells using a Multidrop Combi. Plates are incubated at room temperature for 15 minutes. Reactions are initiated by addition of 2.5μL of 2X substrate solution (PIP2 and ATP in 1X reaction buffer) using a Multidrop Combi. Plates are incubated at room temperature for one hour. Reactions are quenched by the addition of 2.5μL of stop solution (Stop A and Stop B pre-mixed at a ratio of 5:1, respectively) to all wells using the Multidrop Combi. The quenched reactions are then processed to detect product formation by adding 2.5μL of Detection Solution to all wells using the Mulitdrop Combi (Detection mix C, Detection mix A, and Detection mix B combined together in an 18:1:1 ratio, i.e.: for a 6000 μL total volume, mix 5400 μL Detection mix C, 300μL Detection mix A, and 300 μL Detection mix B. Note: this solution should be prepared 2 hours prior to use). Following a one hour incubation in the dark, the HTRF signal is measured on the Envision plate reader set for 330nm excitation and dual emission detection at 620nm (Eu) and 665nm (APC).
In vivo	In a BT474 human tumor xenograft model, Omipalisib (GSK2126458) treatment results in a dose-dependent reduction in pAkt-S473 levels, and exhibited dose-dependent tumor growth inhibition at a low dose of 300 μg/kg. Besides, it shows low blood clearance and good oral bioavailability in four preclinical species (mouse, rat, dog, and monkey). ^[1]
References	http://pubs.acs.org/doi/abs/10.1021/ml900028r https://pubmed.ncbi.nlm.nih.gov/22389471/

Applications

Methods	Biomarkers	Images	PMID
Western blot	p-AKT / AKT / p-RPS6 / RPS6 / p-4E-BP1 / 4E-BP1		31069214
Growth inhibition assay	IC50		26148118

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT01725139	Completed	Idiopathic Pulmonary Fibrosis	GlaxoSmithKline	March 8 2013	Phase 1
NCT01248858	Terminated	Cancer	GlaxoSmithKline	December 3 2010	Phase 1
NCT00972686	Completed	Solid Tumours	GlaxoSmithKline	August 31 2009	Phase 1

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