2. GPCR/G Protein Neuronal Signaling
  3. Orexin Receptor (OX Receptor)
  4. EMPA

EMPA is a high-affinity, reversible and selective orexin OX2 receptor antagonist. [3H]EMPA binds to human and rat OX2-HEK293 membranes with KD values of 1.1 and 1.4 nM respectively.

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EMPA Chemical Structure

EMPA Chemical Structure

CAS No. : 680590-49-2

Size Price Stock Quantity
Solid + Solvent (Highly Recommended)
10 mM * 1 mL in DMSO
ready for reconstitution
 USD 137 In-stock
Solution
10 mM * 1 mL in DMSO USD 137 In-stock
Solid
1 mg USD 60 In-stock
5 mg USD 125 In-stock
10 mg USD 187 In-stock
25 mg USD 337 In-stock
50 mg USD 505 In-stock
100 mg USD 757 In-stock
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Based on 6 publication(s) in Google Scholar

EMPA Related Antibodies

Top Publications Citing Use of Products

View All Orexin Receptor (OX Receptor) Isoform Specific Products:

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OX2 Receptor OX1 Receptor

  • Biological Activity

  • Purity & Documentation

  • References

  • Customer Review

Description

EMPA is a high-affinity, reversible and selective orexin OX2 receptor antagonist. [3H]EMPA binds to human and rat OX2-HEK293 membranes with KD values of 1.1 and 1.4 nM respectively[1].

IC50 & Target[1]

OX2 Receptor

 

In Vitro

EMPA competitively antagonizes orexin-A-and orexin-B-evoked accumulation of [3H]inositol phosphates (IP) at hOX2 receptors with pA2 values of 8.6 and 8.8 respectively[1].
EMPA displaces the [3H]EMPA binding from cell membranes containing human and rat OX2 receptors, with Ki values of 1.10±0.24 nM and 1.45±0.13 nM, respectively[1].
EMPA shows an IC50=5.75 μM, Ki=2.63 μM, and IC50=12.8 μM, Ki=5.8 μM in the binding assay at human and mouse V1a receptors, respectively[1].
In CHO(dHFr-) cells stably expressing hOX2 receptors, EMPA inhibits orexin-A-or orexin-B-evoked [Ca2+]i response with IC50s of 8.8±1.7 nM and 7.9±1.7 nM, respectively[1].

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

EMPA Related Antibodies
In Vivo

EMPA (1-300 mg/kg; i.p.) dose-dependently reverses this [Ala11,D-Leu15]orexin-B-induced hyperlocomotion without itself significantly affecting locomotor activity (LMA) in male NMRI mice[1].
EMPA (3-30 mg/kg; i.p.) induces a significant and dose-dependent reduction in the baseline LMA in france and male Wistar rats. EMPA (3-30 mg/kg; i.p.) demonstrates a clear dose-dependent inhibition of spontaneous activity as compared with vehicle-treated animals[1].

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

Animal Model: Male NMRI mice (20-30 g)[1]
Dosage: 1, 3, 10, 30, 100, 300 mg/kg
Administration: Injected i.p. at a volume of 10 mL/kg
Result: Dose-dependently reversed this [Ala11,D-Leu15]orexin-B-induced hyperlocomotion without itself significantly affecting LMA.
Animal Model: France and Male Wistar rats (196-237 g)[1]
Dosage: 3, 10, 30 mg/kg
Administration: Injected i.p. at a volume of 5 mL/kg
Result: Induced a significant and dose-dependent reduction in the baseline LMA.
Demonstrated a clear dose-dependent inhibition of spontaneous activity as compared with vehicle-treated animals.
Molecular Weight

454.54

Formula

C23H26N4O4S
CAS No.
Appearance

Solid

Color

White to light yellow

SMILES

O=C(N(CC)CC1=CC=CN=C1)CN(C2=CC=C(OC)N=C2)S(=O)(C3=CC=CC=C3C)=O
Shipping

Room temperature in continental US; may vary elsewhere.
Storage
Powder -20°C 3 years
In solvent -80°C 6 months
-20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : 50 mg/mL (110.00 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 2.2000 mL 11.0001 mL 22.0003 mL
5 mM 0.4400 mL 2.2000 mL 4.4001 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: ≥ 2.5 mg/mL (5.50 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 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% (20% SBE-β-CD in Saline)

    Solubility: ≥ 2.5 mg/mL (5.50 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.

    Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
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

Purity: 99.48%

SDS (392 KB)

COA (252 KB) LCMS (98 KB)

Handling Instructions (2659 KB)
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 2.2000 mL 11.0001 mL 22.0003 mL 55.0007 mL
5 mM 0.4400 mL 2.2000 mL 4.4001 mL 11.0001 mL
10 mM 0.2200 mL 1.1000 mL 2.2000 mL 5.5001 mL
15 mM 0.1467 mL 0.7333 mL 1.4667 mL 3.6667 mL
20 mM 0.1100 mL 0.5500 mL 1.1000 mL 2.7500 mL
25 mM 0.0880 mL 0.4400 mL 0.8800 mL 2.2000 mL
30 mM 0.0733 mL 0.3667 mL 0.7333 mL 1.8334 mL
40 mM 0.0550 mL 0.2750 mL 0.5500 mL 1.3750 mL
50 mM 0.0440 mL 0.2200 mL 0.4400 mL 1.1000 mL
60 mM 0.0367 mL 0.1833 mL 0.3667 mL 0.9167 mL
80 mM 0.0275 mL 0.1375 mL 0.2750 mL 0.6875 mL
100 mM 0.0220 mL 0.1100 mL 0.2200 mL 0.5500 mL
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EMPA 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.

Keywords:

EMPA680590-49-2Orexin Receptor (OX Receptor)Hypocretin ReceptorHCRT ReceptorInhibitorinhibitorinhibit

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