MK-8776(SCH 900776)

Modify Date: 2024-01-02 00:05:01

MK-8776(SCH 900776) structure	Common Name	MK-8776(SCH 900776)
	CAS Number	891494-63-6	Molecular Weight	376.254
	Density	1.8±0.1 g/cm3	Boiling Point	N/A
	Molecular Formula	C₁₅H₁₈BrN₇	Melting Point	N/A
	MSDS	N/A	Flash Point	N/A

Use of MK-8776(SCH 900776)

SCH900776 is a potent, selective and oral inhibitor of checkpoint kinase1 (Chk1) with an IC50 of 3 nM. It shows 50- and 500-fold selectivity over CDK2 andChk2, respectively.

Name	sch 900776
Synonym	More Synonyms

Description	SCH900776 is a potent, selective and oral inhibitor of checkpoint kinase1 (Chk1) with an IC50 of 3 nM. It shows 50- and 500-fold selectivity over CDK2 andChk2, respectively.
Related Catalog	Signaling Pathways >> Cell Cycle/DNA Damage >> Checkpoint Kinase (Chk) Research Areas >> Cancer
Target	Chk1:3 nM (IC50) Chk2:1500 nM (IC50) CDK2:160 nM (IC50)
In Vitro	SCH900776 (300 nM) shows potent inhibitory activities against phosphorylation at ser296-Chk1. SCH900776 (1 μM) causes a 30-fold decrease in the IC50 for hydroxyurea in MDA-MB-231 cells[1]. The Kd value of SCH 900776 for the CHK1 kinase domain is 2 nM. SCH 900776 exhibits an approximate EC50 of 60 nM in cells exposure to hydroxyurea. SCH 900776 induces dose-dependent suppression of CHK1 pS296 and concomitant accumulation of phospho-RPA signal in U2OS cells[2].
In Vivo	SCH 900776 induces the γ-H2AX biomarker at 4 mg/kg (i.p.), and enhances tumor pharmacodynamic and regression responses in A2780 xenograft model. SCH 900776 (16 and 32 mg/kg, i.p.) induces incremental improvements in tumor response. Escalation of SCH 900776 dose to 20 and 50 mg/kg in combination with gemcitabine results in improvements in TTP 10× in the A2780 xenograft systems[2].
Kinase Assay	The Kinase Profiler service is used to generate general selectivity data for SCH 900776 against a broad range of serine/threonine and tyrosine kinases. Assays are typically run at two concentrations of SCH 900776 (0.5 and 5 μM), at a fixed (10 μM) concentration of ATP.
Cell Assay	For cell growth assays, cells are seeded at low density (500-1000 cells) in 96-well plates and then incubated with drug for 24 h (8 wells per concentration). Following treatment, cells are washed and grown in fresh media for 5-7 days at 37°C. Prior to attaining confluence, cells are washed, lysed, and stained with Hoechst 33258. Fluorescence is read on a microplate spectrofluorometer. Results are expressed as mean and standard error for the concentration of drug that inhibited growth by 50%.
Animal Admin	For tumor implantation, specific cell lines are grown in vitro, washed once with PBS and resuspended in 50% Matrigel in PBS to a final concentration of 4×107 to 5×107 cells per mL. Nude mice are injected with 0.1 mL of this suspension subcutaneously in the flank region. Tumor length (L), width (W), and height (H) are measured by a caliper twice a week on each mouse and then used to calculate tumor volume using the formula: (L×W×H)/2. Animals (N=10) are randomized to treatment groups and treated intraperitoneally with either SCH 900776 (formulated in 20% hydroxypropyl β-cyclodextrin) or individual chemotherapeutic agents, formulated as recommended. Tumor volumes and body weights are measured during and after the treatment periods. Data are recorded as means±SEM before being normalized to starting volume. Time to progression to 10x starting volume (TTP 10x) is monitored in some experiments. For pharmacodynamic marker analyses in mice, tumors and adjacent skin are collected at necropsy, fixed overnight in 10% formalin, and washed/stored in 70% ethanol. For skin punch biopsies, an area of approximately 4 square inches is shaved. Rats are anesthetized using inhaled isofluorane and dogs are locally anesthetized using subcutaneous administration of lidocaine. Samples are collected using a 4 mm biopsy punch. Skin punches are fixed in 10% formalin overnight before washing/storage in 70% ethanol.
References	[1]. Montano R, et al. Preclinical development of the novel Chk1 inhibitor SCH900776 in combination with DNA-damaging agents and antimetabolites. Mol Cancer Ther. 2012 Feb;11(2):427-38. [2]. Guzi TJ, et al. Targeting the replication checkpoint using SCH 900776, a potent and functionally selective CHK1 inhibitor identified via high content screening. Mol Cancer Ther. 2011 Apr;10(4):591-602.

Density	1.8±0.1 g/cm3
Molecular Formula	C₁₅H₁₈BrN₇
Molecular Weight	376.254
Exact Mass	375.080688
PSA	86.06000
LogP	0.76
Index of Refraction	1.819
Storage condition	-20℃

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MK-8776(SCH 900776)

CAS#:891494-63-6

Literature: SCHERING CORPORATION; CHRISTENSEN, Melodie, D.; KIM, Jungchul Patent: WO2011/119457 A1, 2011 ; Location in patent: Page/Page column 3 ;

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MK-8776(SCH 900776)

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