Taselisib (GDC 0032)

Catalog No.S7103 Synonyms: RG7604

Taselisib (GDC 0032) Chemical Structure

Molecular Weight(MW): 460.53

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

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Biological Activity

Description Taselisib (GDC 0032) is a potent, next-generation β isoform-sparing PI3K inhibitor targeting PI3Kα/δ/γ with Ki of 0.29 nM/0.12 nM/0.97nM, >10 fold selective over PI3Kβ.
Features A beta isoform-sparing PI3K inhibitor.
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)
0.12 nM(Ki) 0.29 nM(Ki) 0.97 nM(Ki) 9.1 nM(Ki) 292 nM
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]
Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human MOLM16 cells NGnSbHFRem:uaX\ldoF1cW:wIHHzd4F6 MVm3NkBp MmL4RY51cXC{b3zp[oVz[XSrdnWgZYN1cX[rdImgZYdicW6|dDDoeY1idiCPT1zNNVYh[2WubIOgZYZ1\XJiN{KgbJJ{KGK7IFPlcIwhXGm2ZYKtRox2\SCjc4PhfS=> M4XxbFIzPzJ5NkSw

... Click to View More Cell Line Experimental Data
In vivo GDC-0032 pharmacokinetics is approximately dose proportional and time independent with a mean t1/2 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]

Protocol

Kinase Assay:[1]
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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 Research:[1]
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  • Animal Models: MCF7-neo/Her2 xenograft model
  • Formulation: 0.5% methylcellulose with 0.2% Tween-80
  • Dosages: 1.4, 2.8, 5.8, 11.25, or 22.5 mg/kg
  • Administration: oral
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 70 mg/mL warmed (151.99 mM)
Water Insoluble
Ethanol Insoluble warmed

* 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.

Chemical Information

Molecular Weight 460.53
Formula

C24H28N8O2
CAS No. 1282512-48-4
Storage powder
in solvent
Synonyms RG7604

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT02390427 Recruiting Metastatic Breast Cancer|Recurrent Breast Cancer Dana-Farber Cancer Institute|Genentech Inc. April 2015 Phase 1
NCT02285179 Recruiting Breast Cancer The Netherlands Cancer Institute|Genentech Inc.|EurocanPlatform|Rather November 2014 Phase 1|Phase 2
NCT01980953 Completed Healthy Volunteer Genentech Inc. November 2013 Phase 1
NCT01967966 Completed Healthy Volunteer Genentech Inc. November 2013 Phase 1
NCT01814709 Completed Healthy Volunteer Genentech Inc. April 2013 Phase 1
NCT01862081 Completed Breast Cancer Non-small Lung Cancer Genentech Inc. July 16 2013 Phase 1

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PI3K Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID