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Chemical Structure| 1138549-36-6 Chemical Structure| 1138549-36-6

Structure of CX-5461
CAS No.: 1138549-36-6

Chemical Structure| 1138549-36-6

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CX-5461 is a potent oral rRNA synthesis inhibitor that inhibits RNA polymerase I-driven transcription of rRNA with IC50 values of 142, 113, and 54 nM in HCT-116, A375, and MIA PaCa-2 cells, respectively.

Synonyms: Pidnarulex

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Product Details of CX-5461

CAS No. :1138549-36-6
Formula : C27H27N7O2S
M.W : 513.61
SMILES Code : O=C(C1=C(SC2=CC=CC=C23)N3C4=C(C=CC(N5CCN(C)CCC5)=N4)C1=O)NCC6=NC=C(C)N=C6
Synonyms :
Pidnarulex
MDL No. :MFCD21609261
InChI Key :XGPBJCHFROADCK-UHFFFAOYSA-N
Pubchem ID :25257557

Safety of CX-5461

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Isoform Comparison

Biological Activity

In Vitro:

Cell Line
Concentration Treated Time Description References
HCT116 BRCA2 knockout cells 10^-8 M 48 h CX-5461 significantly induced more chromosomal abnormalities in BRCA2 knockout HCT116 cells PMC5321743
U2OS cells 10^-7 M 24 h CX-5461 robustly induced γ-H2AX and 53BP1 DNA damage foci in U2OS cells PMC5321743
OVCAR3 12 nM 48 h To evaluate the growth inhibitory effect of CX-5461 on OVCAR3 cells, results showed that CX-5461 inhibited 50% of cell proliferation at 12 nM concentration. PMC7251123
OVCAR8 10 nM and 100 nM To evaluate the growth inhibitory effect of CX-5461 on HR-deficient OVCAR8 cells, results showed increased sensitivity to CX-5461 at 10 nM and 100 nM concentrations. PMC7251123
human pulmonary arterial smooth muscle cells 2 μM 24 h CX-5461 induced cell cycle arrest at G1/S phase, reducing the number of cells in S phase, indicating its anti-proliferative effect. PMC9328314
CHP-134 0.04 µM 3 days Determine the selective activity of CX-5461 in neuroblastoma cells PMC8578635
IMR-5 0.05 µM 48 h Assess the apoptosis-inducing effect of CX-5461 in neuroblastoma cells PMC8578635
HeLa cells 2 µM 2 h To investigate the effect of CX-5461 on nucleolar H2BS14p in undamaged cells, results showed that phosphorylation of H2B was undetectable in the presence of the inhibitor. PMC6068430
LS174t cells 500 nM 24 h Significantly reduced rDNA transcription, decreased 45S pre-RNA expression PMC9348601
HCT116 cells 500 nM 72 h Significantly reduced cell viability, IC50 value of 0.05 µM PMC9348601
DLD1 cells 500 nM 72 h Significantly reduced cell viability, IC50 value of 0.49 µM PMC9348601
HT29 cells 500 nM 72 h Significantly reduced cell viability, IC50 value of 0.43 µM PMC9348601
SW480 cells 500 nM 72 h Significantly reduced cell viability, IC50 value of 0.55 µM PMC9348601
OVCAR3 12 nM 48 h To evaluate the growth inhibitory effect of CX-5461 on OVCAR3 cells, results showed that CX-5461 at 12 nM concentration inhibited 50% of cell proliferation. PMC7251123
OVCAR4 80 nM 48 h To evaluate the synergistic effect of CX-5461 with HR gene siRNAs, results showed that CX-5461 and HR gene siRNAs exhibited strong synergistic inhibition in OVCAR4 cells. PMC7251123
OVCAR8 10 nM and 100 nM To evaluate the growth inhibitory effect of CX-5461 on HR-deficient OVCAR8 cells, results showed that HR-deficient cells exhibited increased sensitivity to CX-5461 at 10 nM and 100 nM concentrations. PMC7251123
BCPAP cells 100 nM 24 or 48 h CX-5461 treatment significantly up-regulated the expression levels of PAX8, DIO1, THRA, THRB, FOXE1, and TSHR in BCPAP cells. PMC10468137
K1 cells 100 nM 24 or 48 h CX-5461 treatment significantly up-regulated the expression levels of PAX8, DIO1, THRA, THRB, FOXE1, and TSHR in K1 cells. PMC10468137
SW1736 cells 100 nM 24 or 48 h CX-5461 treatment significantly up-regulated the expression levels of PAX8, DIO1, THRA, THRB, FOXE1, and TSHR in SW1736 cells. PMC10468137

In Vivo:

Species
Animal Model
Administration Dosage Frequency Description References
mice BRCA2 knockout tumour model oral 50 mg/kg once every three days for 10–20 days CX-5461 substantially and significantly inhibited the growth rate of tumours formed from BRCA2 knockout HCT116 cells and greatly extended the survival time of the mice PMC5321743
Mice HGSOC-PDX model Oral gavage (CX-5461) and intraperitoneal injection (olaparib) 40 mg/kg CX-5461 twice a week for 3 weeks; olaparib once daily for 3 weeks To evaluate the therapeutic efficacy of CX-5461 in combination with PARPi in the HGSOC-PDX model, results showed that the combination of CX-5461 and olaparib significantly prolonged survival and resulted in significant tumor volume reduction. PMC7251123
Sprague-Dawley rats monocrotaline (MCT) or Sugen/hypoxia (Su/H) induced pulmonary arterial hypertension model oral 12.5 mg/kg or 25 mg/kg every 72 hours for 28 or 56 days CX-5461 prevented the development of pulmonary arterial remodelling, perivascular inflammation, pulmonary hypertension, and improved survival. Moreover, CX-5461 partly reversed established pulmonary hypertension. PMC9328314
mice orthotopic patient-derived xenograft neuroblastoma mouse models IP injection 5 mg/kg once daily for 5 days Evaluate the anti-tumor activity of CX-5461 in vivo PMC8578635
Mice CRC xenograft model Oral 50 mg/kg Once daily until tumor volume reached 600 mm³ Significantly inhibited tumor growth, reduced Ki67-positive cells, increased necrotic area PMC9348601
Mice HGSOC-PDX model Oral gavage and intraperitoneal injection 40 mg/kg CX-5461 twice a week, olaparib once daily, for 3 weeks To evaluate the combined therapeutic effect of CX-5461 and PARPi in the HGSOC-PDX model, results showed that the combination of CX-5461 and olaparib significantly prolonged survival and resulted in significant tumor volume reduction. PMC7251123
Mice BCPAP, OCM1, and 611BTPC subcutaneous tumor models Oral 50 mg/kg Twice a week, until tumors reached 600 mm³ CX-5461 effectively inhibited tumor growth in BCPAP, OCM1, and 611BTPC subcutaneous tumor models and showed no or mild loss in the mice tested. PMC10468137

Clinical Trial:

NCT Number Conditions Phases Recruitment Completion Date Locations
NCT04890613 Advanced Solid Tumor PHASE1 RECRUITING 2025-06-25 University of California, Los ... More >>Angeles, Santa Monica, California, 90404, United States|H. Lee Moffitt Cancer Center and Research Institute Hospital, Tampa, Florida, 33612-9497, United States|Dana Farber Cancer Institute, Boston, Massachusetts, 02215, United States|Memorial Sloan-Kettering Cancer Center, New York, New York, 10065, United States|Ohio State University-James Cancer Hospital and Solove Research Institute, Columbus, Ohio, 43202, United States|UPMC Hillman Cancer Center, Pittsburgh, Pennsylvania, 15232, United States|Princess Margaret Cancer Centre, Toronto, Ontario, M5G 1X6, Canada|Centre hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, H2X 0C2, Canada Less <<

Protocol

Bio Calculators
Preparing Stock Solutions 1mg 5mg 10mg

1 mM

5 mM

10 mM

1.95mL

0.39mL

0.19mL

9.74mL

1.95mL

0.97mL

19.47mL

3.89mL

1.95mL

Dissolving Methods
The prepared working fluid is recommended to be prepared now and used up as soon as possible in a short period of time. The percentage shown in front of the following solvent refers to the volume ratio of the solvent in the final solution; If precipitation or precipitation occurs in the preparation process, it can be assisted by heating and/or ultrasound.
Protocol 1

References

 

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