Molecular Weight(MW): 513.61
CX-5461 is an inhibitor of rRNA synthesis, 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.
Cited by 10 Publications
5 Customer Reviews
Pharmacological and siRNA perturbations in HEK293 cells suggest that mTORC1 also modulates cytoplasmic rheology through ribosome crowding in mammals.
Cell, 2018, 174(2):338-349. CX-5461 purchased from Selleck.
Cu(CX-5461) exhibits enhanced circulation lifetime of CX-5461 in vivo. When injected intravenously, over 95% of the injected free CX-5461 has left the plasma compartment within an hour (A). When prepared as Cu-CX5461 inside liposomes, about 10% of the drug was still detected via HPLC at 24 h post-injection. Cu(CX-5461) was cleared over a 48 h period as shown (B) and the copper concentration was reduced similarly (C), suggesting that the Cu(CX-5461) complex dissociated and CX-5461 was lost from the lipid vesicles over time. All data are plotted as mean ± SEM.
J Control Release, 2018, 286:1-9. CX-5461 purchased from Selleck.
The specific Pol I inhibitor CX-5461 causes nucleolar disruption, blocks LTP maintenance and Fsk-induced synthesis of new rRNA. DAPI staining (blue; A, B,C) shows the area of the nucleus. Nomarski images (grey; G, H,I) show the area of the nuclei and nucleoli (arrowheads). Application of Pol I specific inhibitor CX-5461 (200 nM) causes nucleolar disruption as indicated by the distribution of fibrillarin (green); compare A, D to B, E and C, F.
PLoS One 2014 9(8), e104364. CX-5461 purchased from Selleck.
(B) After CX-5461 treatment at different concentrations for 72 hours, whole cell lysates from OS cells were subjected to Western blot analysis using LC3B-II and actin antibodies. (C) The cells were incubated with 2 mM CX-5461 with or without 2.5 mM 3-MA for 72 hours. The percentage of cell death was determined by CellTiter-Glo™ Luminescent Cell Viability Assay. The data represent the mean of three separate experiments performed in triplicate; bars represent SD. *P<0.05; **P<0.01. +, treatment; −, no treatment. Abbreviations: 3-MA, 3-methyladenine; OS, osteosarcoma; SD, standard deviation.
Onco Targets Ther, 2016, 9:5985-5997.. CX-5461 purchased from Selleck.
Purity & Quality Control
Choose Selective DNA/RNA Synthesis Inhibitors
|Description||CX-5461 is an inhibitor of rRNA synthesis, 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 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. 
|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. |
Pol I and Pol II Transcription 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.
|In vitro||DMF||3 mg/mL warmed (5.84 mM)|
|DMSO||0.02 mg/mL (0.03 mM)|
* 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.
Calculate the mass, volume or concentration required for a solution. The Selleck molarity calculator is based on the following equation:
Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)
*When preparing stock solutions, please always use the batch-specific molecular weight of the product found on the via label and MSDS / COA (available on product pages).
Calculate the dilution required to prepare a stock solution. The Selleck dilution calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2 ( Input Output )
* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
Molecular Weight Calculator
Enter the chemical formula of a compound to calculate its molar mass and elemental composition:
Tip: Chemical formula is case sensitive. C10H16N2O2 c10h16n2o2
Instructions to calculate molar mass (molecular weight) of a chemical compound:
To calculate molar mass of a chemical compound, please enter its chemical formula and click 'Calculate'.
Definitions of molecular mass, molecular weight, molar mass and molar weight:
Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02719977||Recruiting||Cancer||Canadian Cancer Trials Group|Senhwa Biosciences Inc.|Stand Up To Cancer||May 16 2016||Phase 1|
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.
Tel: +1-832-582-8158 Ext:3
If you have any other enquiries, please leave a message.
Frequently Asked Questions
I want to make it for further in vivo treatment. I
The solubility of this compound is poor in common vehicles. It can be dissolved in DMF at 3 mg/ml with warming.