Taselisib (GDC 0032)

Catalog No.S7103 Batch:S710301

Technical Data

Formula	C₂₄H₂₈N₈O₂
Molecular Weight	460.53	CAS No.	1282512-48-4
Solubility (25°C)*	In vitro	DMSO	70 mg/mL (151.99 mM)
		Ethanol	7 mg/mL (15.19 mM)
		Water	Insoluble
* <1 mg/ml means slightly soluble or insoluble. * Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations. * Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description

Taselisib (GDC 0032, RG7604) is a potent, next-generation β isoform-sparing PI3K inhibitor targeting PI3Kα/δ/γ with K_i of 0.29 nM/0.12 nM/0.97nM, >10 fold selective over PI3Kβ.

Targets

PI3Kδ ^[1] (Cell-free assay)	PI3Kα ^[1] (Cell-free assay)	PI3Kγ ^[1] (Cell-free assay)	PI3Kβ ^[1] (Cell-free assay)	C2β ^[1] (Cell-free assay)	View More
0.12 nM(Ki)	0.29 nM(Ki)	0.97 nM(Ki)	9.1 nM(Ki)	292 nM	View More

In vitro

GDC-0032 is an orally bioavailable, potent, and selective inhibitor of Class I PI3Kα, δ, and γ isoforms, with 30 fold less inhibition of the PI3K β isoform relative to the PI3Kα isoform. Preclinical data show that GDC-0032 has increased activity against PI3Kα isoform (PIK3CA) mutant and HER2-amplified cancer cell lines. GDC-0032 inhibits MCF7-neo/HER2 cells proliferation with IC50 of 2.5 nM. ^[1]

In vivo

GDC-0032 pharmacokinetics is approximately dose proportional and time independent with a mean t_1/2 of 40 hours. The combination of GDC-0032 enhances activity of fulvestrant resulting in tumor regressions and tumor growth delay (91% tumor growth inhibition (TGI)). In addition, the combination of GDC-0032 with tamoxifen enhances the efficacy of tamoxifen in vivo (102%TGI for GDC-0032). ^[1]

Features

A beta isoform-sparing PI3K inhibitor.

Protocol (from reference)

Kinase Assay:^{^[1]}	Characterization of Biochemical and Cellular Activity in Vitro Enzymatic activity of the class I PI3K isoforms is measured using a fluorescence polarization assay that monitors formation of the product 3,4,5-inositoltriphosphate molecule as it competes with fluorescently labeled PIP3 for binding to the GRP-1 pleckstrin homology domain protein. An increase in phosphatidyl inositide-3-phosphate product results in a decrease in fluorescence polarization signal as the labeled fluorophore is displaced from the GRP-1 protein binding site. Class I PI3K isoforms are expressed and purified as heterodimeric recombinant proteins. Tetramethylrhodamine-labeled PIP3 (TAMRA-PIP3), di-C8-PIP2, and PIP3 detection reagents are purchased from Echelon Biosciences. PI3Kα is assayed under initial rate conditions in the presence of 10 mM Tris (pH 7.5), 25 μM ATP, 9.75 μM PIP2, 5% glycerol, 4 mM MgCl₂, 50 mM NaCl, 0.05% (v/v) Chaps, 1 mM dithiothreitol, and 2% (v/v) DMSO at 60 ng/mL. After assay for 30 min at 25 °C, reactions are terminated with a final concentration of 9 mM EDTA, 4.5 nM TAMRA-PIP3, and 4.2 μg/mL GRP-1 detector protein before reading fluorescence polarization on an Envision plate reader. IC50 values are calculated from the fit of the dose-response curves to a 4-parameter equation. Each reported value is an average of three experiments, and all have a standard deviation less than one geometric mean.
Animal Study:^{^[1]}	Animal Models MCF7-neo/Her2 xenograft model Dosages 1.4, 2.8, 5.8, 11.25, or 22.5 mg/kg Administration oral

Kinase Assay:^{^[1]}

Characterization of Biochemical and Cellular Activity in Vitro
Enzymatic activity of the class I PI3K isoforms is measured using a fluorescence polarization assay that monitors formation of the product 3,4,5-inositoltriphosphate molecule as it competes with fluorescently labeled PIP3 for binding to the GRP-1 pleckstrin homology domain protein. An increase in phosphatidyl inositide-3-phosphate product results in a decrease in fluorescence polarization signal as the labeled fluorophore is displaced from the GRP-1 protein binding site. Class I PI3K isoforms are expressed and purified as heterodimeric recombinant proteins. Tetramethylrhodamine-labeled PIP3 (TAMRA-PIP3), di-C8-PIP2, and PIP3 detection reagents are purchased from Echelon Biosciences. PI3Kα is assayed under initial rate conditions in the presence of 10 mM Tris (pH 7.5), 25 μM ATP, 9.75 μM PIP2, 5% glycerol, 4 mM MgCl₂, 50 mM NaCl, 0.05% (v/v) Chaps, 1 mM dithiothreitol, and 2% (v/v) DMSO at 60 ng/mL. After assay for 30 min at 25 °C, reactions are terminated with a final concentration of 9 mM EDTA, 4.5 nM TAMRA-PIP3, and 4.2 μg/mL GRP-1 detector protein before reading fluorescence polarization on an Envision plate reader. IC50 values are calculated from the fit of the dose-response curves to a 4-parameter equation. Each reported value is an average of three experiments, and all have a standard deviation less than one geometric mean.

Animal Study:^{^[1]}

Animal Models
MCF7-neo/Her2 xenograft model
Dosages
1.4, 2.8, 5.8, 11.25, or 22.5 mg/kg
Administration
oral

References

[1] Ndubaku CO, et al. J Med Chem, 2013, 56(11), 4597-4610.

Selleck's Taselisib (GDC 0032) has been cited by 33 publications

AKT1 phosphorylation of cytoplasmic ME2 induces a metabolic switch to glycolysis for tumorigenesis [ Nat Commun, 2024, 15(1):686]	PubMed: 38263319
Azeliragon inhibits PAK1 and enhances the therapeutic efficacy of AKT inhibitors in pancreatic cancer [ Eur J Pharmacol, 2023, 948:175703]	PubMed: 37028543
Selective Inhibition of PI3K Isoforms in Brain Tumors Suppresses Tumor Growth by Increasing Radiosensitivity [ Yonsei Med J, 2023, 64(2):139-147]	PubMed: 36719022
PI3K drives the de novo synthesis of coenzyme A from vitamin B5 [ Nature, 2022, 608(7921):192-198]	PubMed: 35896750
MEK inhibition overcomes chemoimmunotherapy resistance by inducing CXCL10 in cancer cells [ Cancer Cell, 2022, S1535-6108(21)00662-0]	PubMed: 35051357
The Oncogenic PI3K-Induced Transcriptomic Landscape Reveals Key Functions in Splicing and Gene Expression Regulation [ Cancer Res, 2022, 82(12):2269-2280]	PubMed: 35442400
Leveraging patient derived models of FGFR2 fusion positive intrahepatic cholangiocarcinoma to identify synergistic therapies [ NPJ Precis Oncol, 2022, 6(1):75]	PubMed: 36274097
Dual inhibition of the MEK/ERK and PI3K/AKT pathways prevents pulmonary GVHD suppressing perivenulitis and bronchiolitis [ Blood Adv, 2022, bloodadvances.2021006678]	PubMed: 35468620
PTRF/Cavin-1 as a Novel RNA-Binding Protein Expedites the NF-κB/PD-L1 Axis by Stabilizing lncRNA NEAT1, Contributing to Tumorigenesis and Immune Evasion in Glioblastoma [ Mol Oncol, 2022, 16(5):1091-1118]	PubMed: 34748271
Dual Inhibition of Myc Transcription and PI3K Activity Effectively Targets Colorectal Cancer Stem Cells [ Cancers (Basel), 2022, 14(3)673]	PubMed: 35158939

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