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SeSA-HCPT

Cat No.:V144805 Purity: ≥98%
SeSA-HCPT is an orally effective dual-target inhibitor that integrates the inhibitory effects of topoisomerase I and histone deacetylase (HDAC).
SeSA-HCPT
SeSA-HCPT Chemical Structure Product category: RAD51
This product is for research use only, not for human use. We do not sell to patients.
Size Price
500mg
1g
Other Sizes
Official Supplier of:
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Product Description
SeSA-HCPT is an orally effective dual-target inhibitor that integrates the inhibitory effects of topoisomerase I and histone deacetylase (HDAC). SeSA-HCPT induces strong DNA damage, apoptosis, and S-phase arrest in prostate cancer cells. SeSA-HCPT inhibits cancer cell proliferation and migration. SeSA-HCPT inhibits homologous recombination by suppressing the KIF4A-RAD51 signaling pathway. SeSA-HCPT significantly inhibits tumor growth in castration-resistant prostate cancer (CRPC) with extremely low systemic toxicity.
Biological Activity I Assay Protocols (From Reference)
ln Vitro
SeSA-HCPT (48 hours) exhibited excellent selective cytotoxicity against AR-positive (LNCaP) and AR-negative (PC3, DU145) human prostate cancer cells, with IC50 values of 0.182, 0.198 and 0.175 μM, respectively, and extremely low cytotoxicity against normal human keratinocytes HaCaT (IC50 = 5.17 μM) [1]. SeSA-HCPT (200 nM; 24-48 hours) significantly induced apoptosis in PC3, DU145 and LNCaP human prostate cancer cells [1]. SeSA-HCPT (0.175-5.17 μM; 24 hours) induced S-phase cell cycle arrest in PC3, DU145 and LNCaP human prostate cancer cells, had no effect on normal human keratinocytes HaCaT, and upregulated the expression of cyclin E in PC3 and DU145 cells [1]. SeSA-HCPT (3-10 μM) inhibits topoisomerase I (TopoI)-mediated DNA relaxation and has a higher affinity for the TopoI-DNA complex than HCPT, thereby enhancing its ability to block the catalytic function of TopoI [1]. SeSA-HCPT (1.25-5 nM) inhibits histone deacetylase (HDAC) activity in PC3 and DU145 human prostate cancer cells [1]. SeSA-HCPT (1.25-5 nM) can induce dose-dependent DNA damage in PC3 and DU145 human prostate cancer cells, manifested as an increase in γ-H2AX levels [1]. SeSA-HCPT (5 nM; 24-48 h) significantly inhibits the proliferation and migration of PC3 and DU145 human prostate cancer cells [1]. SeSA-HCPT (0-50 nM; 24 hours) impaired homologous recombination-mediated DNA repair in PC3 and DU145 human prostate cancer cells by downregulating KIF4A and reducing Rad51 recruitment to DNA damage sites, while inducing DNA damage responses and causing a dose-dependent decrease in KIF4A levels from 0 nM to 50 nM [1].
ln Vivo
SeSA-HCPT (20 mg/kg; ig; single dose) can effectively inhibit the growth of castration-resistant prostate cancer xenografts, reduce tumor cell proliferation, induce DNA damage, and has minimal systemic toxicity [1].
Cell Assay
Apoptosis analysis [1]
Cell Types: PC3, DU145, LNCaP cells
Tested Concentrations: 200 nM (Annexin V/PI staining); 200 nM (Western blot)
Incubation Duration: 48 hours (Annexin V/PI staining); 24 hours (Western blot)
Experimental Results: A significantly increased level of apoptosis was induced. The levels of cleaved caspase-3 and p21 were increased in all three cell lines.
Cell cycle analysis [1]
Cell Types: PC3, DU145, LNCaP, HaCaT cells
Tested Concentrations: 0.175, 0.182, 0.198, 5.17 μM
Incubation Duration: 24 hours
Experimental Results: Significantly induced S-phase arrest in PC3, DU145, and LNCaP cells. Upregulated the expression of cyclin E in PC3 and DU145 cells, while the levels of cyclin A2 or cyclin B did not change significantly. Did not alter the cell cycle distribution of HaCaT cells.
Western Blot Analysis [1]
Cell Types: PC3, DU145 cells
Tested Concentrations: 1, 5, 10, 30, 50 nM
Incubation Duration: 24 hours
Experimental Results: γ-H2AX and phosphorylated ATM (pS1981-ATM) levels increased at 5 nM. KIF4A levels decreased from 1 to 50 nM.
Animal Protocol
Animal/Disease Models:BALB/c nude mice (male, 5 weeks old, PC3 cell subcutaneous xenograft) [1]
Doses: 20 mg/kg
Route of Administration: Immunoglobulin; single dose
Experimental Results: Significantly reduced tumor weight and growth. Significantly reduced Ki67-positive cells. Significantly increased γ-H2AX-positive cells. No significant difference in body weight compared to the control group. No significant changes in liver (ALT, AST, ALP) or kidney (BUN, creatinine) indicators.
References

[1]. SeSA-HCPT: A dual-targeting agent that induces DNA damage and inhibits repair for castration-resistant prostate cancer therapy. iScience. 2026;29(2):114824. Published 2026 Jan 29.

These protocols are for reference only. InvivoChem does not independently validate these methods.
Physicochemical Properties
Molecular Formula
C76H76N6O18SE2
Molecular Weight
1519.37
Appearance
Typically exists as solids at room temperature
SMILES
O=C(NC1=CC(COC(CCC(OC2=C(C=C(CN3C4=CC5=C(COC(C5(CC)O)=O)C3=O)C4=N6)C6=CC=C2)=O)=O)=CC=C1)CCCCCC[Se][Se]CCCCCCC(NC7=CC(COC(CCC(OC8=C9C=C%10CN%11C(C%12=C(C=C%11C%10=NC9=CC=C8)C(O)(C(OC%12)=O)CC)=O)=O)=O)=CC=C7)=O
HS Tariff Code
2934.99.9001
Storage

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Shipping Condition
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
Solubility Data
Solubility (In Vitro)
May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples
Solubility (In Vivo)
Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples.

Injection Formulations
(e.g. IP/IV/IM/SC)
Injection Formulation 1: DMSO : Tween 80: Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution 50 μL Tween 80 850 μL Saline)
*Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution.
Injection Formulation 2: DMSO : PEG300Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO 400 μLPEG300 50 μL Tween 80 450 μL Saline)
Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO 900 μL Corn oil)
Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals).
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Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO 900 μL (20% SBE-β-CD in saline)]
*Preparation of 20% SBE-β-CD in Saline (4°C,1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.
Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin 500 μL Saline)
Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO 100 μLPEG300 200 μL castor oil 650 μL Saline)
Injection Formulation 7: Ethanol : Cremophor : Saline = 10: 10 : 80 (i.e. 100 μL Ethanol 100 μL Cremophor 800 μL Saline)
Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline
Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH 900 μL Corn oil)
Injection Formulation 10: EtOH : PEG300Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH 400 μLPEG300 50 μL Tween 80 450 μL Saline)


Oral Formulations
Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium)
Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose
Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals).
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Oral Formulation 3: Dissolved in PEG400
Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose
Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose
Oral Formulation 6: Mixing with food powders


Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.

 (Please use freshly prepared in vivo formulations for optimal results.)
Preparing Stock Solutions 1 mg 5 mg 10 mg
1 mM 0.6582 mL 3.2908 mL 6.5817 mL
5 mM 0.1316 mL 0.6582 mL 1.3163 mL
10 mM 0.0658 mL 0.3291 mL 0.6582 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.

Calculator

Molarity Calculator allows you to calculate the mass, volume, and/or concentration required for a solution, as detailed below:

  • Calculate the Mass of a compound required to prepare a solution of known volume and concentration
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An example of molarity calculation using the molarity calculator is shown below:
What is the mass of compound required to make a 10 mM stock solution in 5 ml of DMSO given that the molecular weight of the compound is 350.26 g/mol?
  • Enter 350.26 in the Molecular Weight (MW) box
  • Enter 10 in the Concentration box and choose the correct unit (mM)
  • Enter 5 in the Volume box and choose the correct unit (mL)
  • Click the “Calculate” button
  • The answer of 17.513 mg appears in the Mass box. In a similar way, you may calculate the volume and concentration.

Dilution Calculator allows you to calculate how to dilute a stock solution of known concentrations. For example, you may Enter C1, C2 & V2 to calculate V1, as detailed below:

What volume of a given 10 mM stock solution is required to make 25 ml of a 25 μM solution?
Using the equation C1V1 = C2V2, where C1=10 mM, C2=25 μM, V2=25 ml and V1 is the unknown:
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  • Enter 25 into the Concentration (End) box and select the correct unit (mM)
  • Enter 25 into the Volume (End) box and choose the correct unit (mL)
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  • The answer of 62.5 μL (0.1 ml) appears in the Volume (Start) box
g/mol

Molecular Weight Calculator allows you to calculate the molar mass and elemental composition of a compound, as detailed below:

Note: Chemical formula is case sensitive: C12H18N3O4  c12h18n3o4
Instructions to calculate molar mass (molecular weight) of a chemical compound:
  • To calculate molar mass of a chemical compound, please enter the chemical/molecular formula and click the “Calculate’ button.
Definitions of molecular mass, molecular weight, molar mass and molar weight:
  • Molecular mass (or 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.
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Reconstitution Calculator allows you to calculate the volume of solvent required to reconstitute your vial.

  • Enter the mass of the reagent and the desired reconstitution concentration as well as the correct units
  • Click the “Calculate” button
  • The answer appears in the Volume (to add to vial) box
In vivo Formulation Calculator (Clear solution)
Step 1: Enter information below (Recommended: An additional animal to make allowance for loss during the experiment)
Step 2: Enter in vivo formulation (This is only a calculator, not the exact formulation for a specific product. Please contact us first if there is no in vivo formulation in the solubility section.)
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Calculation results

Working concentration mg/mL;

Method for preparing DMSO stock solution mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.

Method for preparing in vivo formulation:Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O,mix and clarify.

(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
             (2) Be sure to add the solvent(s) in order.

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