CX-5461 dihydrochloride

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本产品不向个人销售，仅用作科学研究，不用于任何人体实验及非科研性质的动物实验。

规格:

≥98%

包装与价格：

包装	价格(元)
5mg	电议
10mg	电议
25mg	电议
50mg	电议
100mg	电议
250mg	电议
500mg	电议

产品介绍

CX-5461 dihydrochloride is a novel, potent, selective and orally bioavailable inhibitor of rRNA synthesis, it selectively inhibits Pol I-driven transcription of rRNA with IC50 of 142 nM in HCT-116, A375, and MIA PaCa-2 cells, has no effect on Pol II, and possesses 250- to 300-fold selectivity for inhibition of rRNA transcription versus DNA replication and protein translation. CX-5461 was revealed to inhibit Pol I transcription via promoting the stabilization of p53. In addition, CX-5461 has been demonstrated to induce autophagy and senescence but not apoptosis in MIA Paca-2 and A375 cell lines. Inhibition of Pol I by CX-5461 can selectively induce p53-mediated apoptosis of tumour cells in vivo. Currently, CX-5461 is in clinical trial for patients with advanced haematological malignancies (Peter Mac, Melbourne). CX-5461 also induces p53-independent cell cycle checkpoints mediated by ATM/ATR signaling in the absence of DNA damage. Further, the combination of drugs targeting ATM/ATR signaling and CX-5461 leads to enhanced therapeutic benefit in treating p53-null tumours in vivo, which are normally refractory to each drug alone. Mechanistically, CX-5461 induces an unusual chromatin structure in which transcriptionally competent relaxed rDNA repeats are devoid of transcribing Pol I leading to activation of ATM signaling within the nucleoli. Thus, the acute inhibition of Pol transcription initiation by CX-5461 induces a novel nucleolar stress response that can be targeted to improve therapeutic efficacy.

理化性质和储存条件

Molecular Weight (MW)	586.54
Formula	C27H29Cl2N7O2S
CAS No.	N/A
Storage	-20℃ for 3 years in powder form
Storage	-80℃ for 2 years in solvent
Solubility (In vitro)	DMSO: N/A
	Water: >20 mg/mL
	Ethanol: N/A
Other info	IUPAC/Chemical Name: 2-(4-methyl-1,4-diazepan-1-yl)-N-((5-methylpyrazin-2-yl)methyl)-5-oxo-5H-benzo[4,5]thiazolo[3,2-a][1,8]naphthyridine-6-carboxamide dihydrochloride SMILES Code: CC1=NC=C(CNC(C2=C3N(C4=NC(N5CCN(CCC5)C)=CC=C4C2=O)C6=C(S3)C=CC=C6)=O)N=C1.[2 HCl]
Synonyms	CX5461 dihydrochloride; CX 5461 2HCl; CX-5461 diHCl

实验参考方法

In Vitro	In vitro activity: CX-5461 is found to selectively inhibit rRNA synthesis (Pol I IC50=142 nM; Pol II IC50> 25 μM; selectivity ~200-fold) in the HCT-116 cells. Selective inhibition of rRNA synthesis by CX-5461 is confirmed in two other human solid tumor cell lines; melanoma A375 (Pol I IC50 = 113 nM; Pol II IC50> 25 μM) and pancreatic carcinoma MIA PaCa-2 (Pol I IC50=54 nM; Pol II IC50 ~25 mM). CX-5461 possesses 250- to 300-fold selectivity for inhibition of rRNA transcription versus DNA replication and protein translation. CX-5461 exhibits broad antiproliferative potency in a panel of cancer cell lines in human cancer cell lines, but has minimal effect on viability of nontransformed human cells. The median EC50 across all tested cell lines is 147 nM, yet all normal cell lines have EC50 values of approximately 5, 000 nM. Evaluation of the antiproliferative dose response for HCT-116, A375, and MIA PaCa-2 cell lines yield EC50 values of 167, 58, and 74 nM. CX-5461 induces autophagy and senescence in solid tumor cancer cells, rather than apoptosis, through a p53-independent process. Kinase Assay: Two short-lived RNA transcripts (half-lives ~20-30 minutes), one produced by Pol I and another by Pol II, are quantitated by qRT-PCR as a measure of CX-5461-related effects on transcription. The 45S pre-rRNA served as the Pol I transcript and the mRNA for the protooncogene c-myc served as the comparator Pol II transcript. Both Pol I and Pol II transcription are known to be affected by general cellular stress. To minimize the potential effects of such stress, cells are exposed to test agents for only a short period of time (2 hours). This is sufficient time for these transcripts to be reduced by greater than 90% if CX-5461 affects their synthesis. Cell Assay: Cells are plated on 96-well plates and treated the next day with dose response of CX-5461 for 96 hours. Cell viability is determined using Alamar Blue and CyQUANT assays.
In Vivo	CX-5461 is orally bioavailable and demonstrates in vivo antitumor activity against human solid tumors in murine xenograft models. CX-5461 demonstrates significant MIA PaCa-2 TGI with TGI equal to 69% on day 31, comparable to that of gemcitabine (63% TGI). Gemcitabine is a positive control which is administered intraperitoneally once every 3 days at 120 mg/kg. Likewise, CX- 5461 demonstrates significant A375 TGI with TGI equal to 79% on day 32.
Animal model	Paca-2 and A375 cancer cells are subcutaneously inoculated in the right flank of 5- to 6- week-old female athymic mice
Formulation & Dosage	Dissolved in 50 mM NaH2PO4 (pH 4.5); 50 mg/kg; Oral gavage
References	Cancer Res. 2011 Feb 15;71(4):1418-30.