Home Cell Cycle Chk inhibitor Prexasertib HCl (LY2606368) For research use only.

Prexasertib HCl (LY2606368)

Prexasertib(LY2606368) is an ATP-competitive CHK1 inhibitor with a Ki value of 0.9 nmol/L. For CHK2 and RSK, its IC50 values are 8 nM and 9 nM respectively in cell-free assay.

Prexasertib HCl (LY2606368) Chemical Structure

Prexasertib HCl (LY2606368) Chemical Structure

CAS No. 1234015-54-3

Purity & Quality Control

Products often used together with Prexasertib HCl (LY2606368)

Samotolisib (LY3023414)

LY2606368 and LY3023414 combination results in tumor regression in OV-90 and Cov504 tumors and significantly enhanced efficacy when compared to singe agent.

Dempsey J, et al. Cancer Res (2019) 79 (13_Supplement): 1761.

Prexasertib HCl (LY2606368) Related Products

Signaling Pathway

Chk Signaling Pathways

Chk Signaling Pathway

Cell Data

Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
HeLa cells Function assay 33 or 100 nmol/L 7 hours by 7 hours, a subpopulation of cells stained strongly for DSB by both TUNEL and pH2AX 26141948
U-2 OS cells Function assay 4 nmol/L 24 h a large shift in cell-cycle populations from G1 and G2–M to S-phase with an accompanied induction of H2AX phosphorylation. 26141948
CCRF-CEM parental cells Function assay 10 nM 4 h induced SLFN11 binding to chromatin and increased the chromatin binding of CDC45 29395061
SLFN11-del cells Function assay 10 nM 4 h induced SLFN11 binding to chromatin and increased the chromatin binding of CDC45 29395061
K562-WT Function assay 100 nM 2 h SLFN11, CDC45 and PCNA were enriched on nascent DNA 29395061
K562-E669Q Function assay 100 nM 2 h SLFN11, CDC45 and PCNA were enriched on nascent DNA 29395061
CCRF-CEM parental cells Function assay 100 nM 2 h SLFN11, CDC45 and PCNA were enriched on nascent DNA 29395061
HCT-116 cells Function assay 10 days inhibited both FANCD2 ubiquitination and increased Rad51 levels, significantly increased sensitivity of HCT-116 cells to F10 30439567
U937 cells Function assay 3 nM enhanced the cytotoxicity of CPX-351 at low nanomolar concentrations 30837643
KB-3-1 Function assay P-glycoprotein substrates identified in KB-3-1 adenocarcinoma cell line, qHTS therapeutic library screen 31515284
KB-8-5-11 Function assay P-glycoprotein substrates identified in KB-8-5-11 adenocarcinoma cell line, qHTS therapeutic library screen, Potency = 1.2995 μM. 31515284
Click to View More Cell Line Experimental Data

Biological Activity

Description Prexasertib(LY2606368) is an ATP-competitive CHK1 inhibitor with a Ki value of 0.9 nmol/L. For CHK2 and RSK, its IC50 values are 8 nM and 9 nM respectively in cell-free assay.
Targets
Chk1 [1]
(Cell-free assay)		 Chk2 [1]
(Cell-free assay)		 RSK [1]
(Cell-free assay)
0.9 nM(Ki) 8 nM 9 nM
In vitro
In vitro

In nonclinical studies, LY2606368 induced DNA damage as measured by replication catastrophe and increases in pH2A.X, a marker of double-stranded DNA breaks[1]. Treatment of cells with LY2606368 results in the rapid appearance of TUNEL and pH2AX-positive double-stranded DNA breaks in the S-phase cell population. In a functional assay, LY2606368 potently abrogated the G2–M checkpoint activated by doxorubicin in p53-deficient HeLa cells with an EC50 of 9 nmol/L. LY2606368 was broadly antiproliferative with IC50 values typically <50 nmol/L in the most sensitive cell lines with a minority of cell lines showing considerable resistance with IC50's >1,000 nmol/L. LY2606368 requires CDC25A and CDK2 to cause DNA damage[2].
Cell Research Cell lines HeLa cells
Concentrations 33 or 100 nmol/L
Incubation Time 12 h
Method

HeLa cells were plated onto T25 flasks and allowed to recover for 24 hours. LY2606368 was then added to give final concentrations of 33 or 100 nmol/L. In some experiments, 20μmol/L Z-VAD-FMK was included during the drug treatment. Cells were treated for 12 hours, and during the last 2 hours, Colchisol was added to 1 μg/mL. Fixation of nuclei for metaphase spreads was done following the method of Bayani and Squire. Chromosome spreads were done. A 12-μL volume of cell suspension in 3:1 methanol/acetic acid fixative was dropped from a height of 3 cm onto dry glass slides or coverslips. The slides were then heated for 45 seconds on a 43°C metal block, before being removed to allow drying to complete at room temperature. Coverslips were mounted on slides with Vectashield Hard Set mounting medium with DAPI. Slides were examined with a Leica DMR fluorescence microscope and images were captured using a SPOT RT3 Slider camera.
Experimental Result Images Methods Biomarkers Images PMID
Western blot CHK1 / p-CHK1(Ser345) / γH2AX / Cleaved caspase3 pS6 (S235/236) / pS6 (S240/244) 28401005
Immunofluorescence SLFN11 / CDC45 / EdU 29395061
Growth inhibition assay Cell viability IC50 28401005
In Vivo
In vivo

LY2606368 inhibited tumor growth in cancer xenografts as monotherapy and in combination with other agents[1]. In an orthotopic SKOV3 ovarian cancer model, LY2606368 was shown to inhibit the growth of primary tumors and significantly reduce the incidence of metastases and ascites accumulation. LY2606368 also demonstrated efficacy in an SW1990 orthotopic pancreatic cancer model resulting in a 92% inhibition of primary tumor growth and the elimination of metastases to the lymphnode, spleen, and intestine[3].
Animal Research Animal Models Female CD-1 nu-/nu- mice
Dosages 15 mg/kg
Administration s.c.
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT04095221 Active not recruiting
Desmoplastic Small Round Cell Tumor|Rhabdomyosarcoma
Memorial Sloan Kettering Cancer Center
 September 17 2019 Phase 1|Phase 2
NCT03495323 Completed
Cancer
Dana-Farber Cancer Institute|Eli Lilly and Company
 May 16 2018 Phase 1
NCT03414047 Completed
Ovarian Cancer
Eli Lilly and Company
 April 10 2018 Phase 2
NCT03057145 Completed
Solid Tumor
Geoffrey Shapiro MD PhD|Eli Lilly and Company|AstraZeneca|Dana-Farber Cancer Institute
 March 10 2017 Phase 1

Chemical Information & Solubility

Molecular Weight 438.31 Formula

C18H19N7O2.2HCl
CAS No. 1234015-54-3 SDF Download Prexasertib HCl (LY2606368) SDF
Smiles COC1=C(C(=CC=C1)OCCCN)C2=CC(=NN2)NC3=NC=C(N=C3)C#N.Cl.Cl
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 17 mg/mL ( (38.78 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble


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In vivo
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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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Frequently Asked Questions

Question 1:
Would you please suggest a suitable vehicle to dissolve Prexasertib HCl (LY2606368) for in vivo use?

Answer:
You can dissolve S7178 in a vehicle: 5% DMSO+40%PEG 300+5%Tween80+ddH2O for in vivo use in mice (i.p.). This stock concentration reahces 10mg/ml, and can be prepared for work solution as 0.5mg/ml, stable for no longer than 30min.

Question 2:
What is the solubility of LY2606368 in 20% Captisol?

Answer:
S7178 in 20% Captisol is a suspension, which is fine for oral gavage. You can dissolve it in this vehicle to the concentration you need as long as the suspension is homogeneous.

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