CODE:  331-10013

Molecule Information

Chemical Name
CAS Number
Molecular Weight


30.55mg/mL in DMSO

Physical Appearance

A solid


Desiccate at -20°C


Cell experiment [1]:

Cell lines

Primary human fetal mixed glial/neuronal brain cell, human microglial cell

Preparation method

The solubility of this compound in DMSO is >30.6 mg/mL. General tips for obtaining a higher concentration: Please warm the tube at 37°C for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20°C for several months.

Reacting condition

0.1 nM


In mixed glial/neuronal cell cultures infected with HIV-1, endomorphin-1 potentiated the expression of HIV-1 in a bell-shaped dose-response manner. Endomorphin-1 (0.1 nM) consistently amplified the replication of HIV-1. In microglial cells, endomorphin-1 potentiated the expression of HIV-1, with maximal enhancement of HIV-1 expression at 10-10M.

Animal experiment [2, 3]:

Animal models

Male ICR mice, adult female Sprague-Dawley rats

Dosage form

i.c.v. injection, 5 min, 3.28 nM-16.38 nM, intrathecal injection


Endomorphin-1 inhibited the tail-flick (AD50 = 6.16 nM) and hot-plate responses (AD50 = 1.94 nM) in a dose-dependent manner at 5 min after i.c.v. injection. In rats, intrathecal injection of 1:10 and 1:100 times diluted EM1 antiserum significantly decreased the effect of 2 Hz electroacupuncture analgesia.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.


[1]. Peterson P K, Gekker G, Hu S, et al. Endomorphin-1 potentiates HIV-1 expression in human brain cell cultures: implication of an atypical µ-opoid receptor[J]. Neuropharmacology, 1999, 38(2): 273-278.

[2]. Tseng L F, Narita M, Suganuma C, et al. Differential antinociceptive effects of endomorphin-1 and endomorphin-2 in the mouse[J]. Journal of Pharmacology and Experimental Therapeutics, 2000, 292(2): 576-583.

[3]. Han Z, Jiang Y H, Wan Y, et al. Endomorphin-1 mediates 2 Hz but not 100 Hz electroacupuncture analgesia in the rat[J]. Neuroscience letters, 1999, 274(2): 75-78.