1. GPCR/G Protein
  2. Protease Activated Receptor (PAR)
  3. Atopaxar

Atopaxar  (Synonyms: E5555; ER-172594-00)

Cat. No.: HY-18200 Purity: 98.05%
COA Handling Instructions

Atopaxar (E5555) is a potent, orally active, selective and reversible thrombin receptor protease-activated receptor-1 (PAR-1) antagonist. Atopaxar, an antiplatelet agent, interferes with platelet signaling. Atopaxar can be used for the research of atherothrombotic disease.

For research use only. We do not sell to patients.

Atopaxar Chemical Structure

Atopaxar Chemical Structure

CAS No. : 751475-53-3

Size Price Stock Quantity
Solid + Solvent
10 mM * 1 mL in DMSO
ready for reconstitution
USD 197 In-stock
Solution
10 mM * 1 mL in DMSO USD 197 In-stock
Solid
1 mg USD 85 In-stock
5 mg USD 170 In-stock
10 mg USD 310 In-stock
25 mg USD 560 In-stock
50 mg USD 1080 In-stock
100 mg USD 1800 In-stock
200 mg   Get quote  
500 mg   Get quote  

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This product is a controlled substance and not for sale in your territory.

Customer Review

Based on 1 publication(s) in Google Scholar

Other Forms of Atopaxar:

Top Publications Citing Use of Products
  • Biological Activity

  • Purity & Documentation

  • References

  • Customer Review

Description

Atopaxar (E5555) is a potent, orally active, selective and reversible thrombin receptor protease-activated receptor-1 (PAR-1) antagonist. Atopaxar, an antiplatelet agent, interferes with platelet signaling. Atopaxar can be used for the research of atherothrombotic disease[1][2].

IC50 & Target

PAR-1[1]

In Vitro

Atopaxar (0.0001-10 μM; 1h) inhibits haTRAP (high-affinity thrombin receptor activating peptide) binding to PAR-1 on human platelet membranes in a concentration-dependent manner, with an IC50 of 0.019 μM[2].
Atopaxar inhibits human platelet aggregation induced by thrombin or TRAP in a concentration-dependent manner[2].
Atopaxar does not inhibit PRP (platelet-rich plasma) aggregation induced by ADP, U46619, collagen, and PAR-4ap, up to a concentration of 20 μM[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

Atopaxar (30-100 mg/kg; p.o.) causes a dose-dependent prolongation of the time to occlusion of the femoral artery in photochemically-induced thrombosis (PIT) guinea pigs model[2].
Atopaxar does not prolong bleeding time in guinea pigs at the highest tested dosage of 1000 mg/kg[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Model: Guinea pigs, PIT model[2]
Dosage: Oral administration
Administration: 10 mg/kg, 30 mg/kg, 100 mg/kg
Result: Prolonged the time to occlusion by 1.8-fold and 2.4-fold at 30 mg/kg and 100 mg/kg, respectively, compared with controls.
Clinical Trial
Molecular Weight

527.63

Formula

C29H38FN3O5

CAS No.
Appearance

Solid

Color

White to off-white

SMILES

COC1=C(N2CCOCC2)C=C(C(CN(CC3=C4C(F)=C(OCC)C(OCC)=C3)C4=N)=O)C=C1C(C)(C)C

Shipping

Room temperature in continental US; may vary elsewhere.

Storage
Powder -20°C 3 years
4°C 2 years
In solvent -80°C 6 months
-20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : 50 mg/mL (94.76 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 1.8953 mL 9.4763 mL 18.9527 mL
5 mM 0.3791 mL 1.8953 mL 3.7905 mL
View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

  • Molarity Calculator

  • Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass
=
Concentration
×
Volume
×
Molecular Weight *

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start)

C1

×
Volume (start)

V1

=
Concentration (final)

C2

×
Volume (final)

V2

In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

  • Protocol 1

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 2.08 mg/mL (3.94 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

    Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
  • Protocol 2

    Add each solvent one by one:  10% DMSO    90% Corn Oil

    Solubility: ≥ 2.08 mg/mL (3.94 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown). If the continuous dosing period exceeds half a month, please choose this protocol carefully.

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 900 μL Corn oil, and mix evenly.

In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

g

Dosing volume
(per animal)

μL

Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
%
DMSO +
+
%
Tween-80 +
%
Saline
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Calculation results:
Working solution concentration: mg/mL
Method for preparing stock solution: mg drug dissolved in μL  DMSO (Stock solution concentration: mg/mL).
The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only. If necessary, please contact MedChemExpress (MCE).
Method for preparing in vivo working solution for animal experiments: Take μL DMSO stock solution, add μL . μL , mix evenly, next add μL Tween 80, mix evenly, then add μL Saline.
 If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
Purity & Documentation
References

Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
DMSO 1 mM 1.8953 mL 9.4763 mL 18.9527 mL 47.3817 mL
5 mM 0.3791 mL 1.8953 mL 3.7905 mL 9.4763 mL
10 mM 0.1895 mL 0.9476 mL 1.8953 mL 4.7382 mL
15 mM 0.1264 mL 0.6318 mL 1.2635 mL 3.1588 mL
20 mM 0.0948 mL 0.4738 mL 0.9476 mL 2.3691 mL
25 mM 0.0758 mL 0.3791 mL 0.7581 mL 1.8953 mL
30 mM 0.0632 mL 0.3159 mL 0.6318 mL 1.5794 mL
40 mM 0.0474 mL 0.2369 mL 0.4738 mL 1.1845 mL
50 mM 0.0379 mL 0.1895 mL 0.3791 mL 0.9476 mL
60 mM 0.0316 mL 0.1579 mL 0.3159 mL 0.7897 mL
80 mM 0.0237 mL 0.1185 mL 0.2369 mL 0.5923 mL
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Atopaxar Related Classifications

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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