Spiradoline  (Synonyms: U-62066)

Spiradoline (U-62066), an arylacetamide, is a selective kappa opioid receptor (KOR) agonist with a K_i of 8.6 nM in guinea pig. The K_i values of Spiradoline for μ and δ receptors are 252 nM and 9400 nM, respectively. Spiradoline has potent diuretic, analgesic, antiarrythmic, antitussive, neuroprotective properties and easily penetrates the blood-brain barrier^[1][2].

Ki: 8.6 nM (κ-opioid receptor in guinea pig), 252 nM (μ-receptor) and 9400 nM (δ-receptor)^[2]

Using the patch-clamp method in isolated rat cardiac myocytes, indicated that Spiradoline (15 to 500 μM) produces its antiarrythmic effect via blockade of sodium channels (and at the higher doses also of potassium currents) in myocardial tissue. Thus, Spiradoline reduces the peak sodium current, increased the decay rate of the transient outward potassium current, and reduced the sustained plateau potassium amplitude^[2].

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

Spiradoline (U-62066; 0.1-0.4 mg/kg; subcutaneous injection; once; Sprague-Dawley rats) treatment dose-dependently reduces social behaviors in non-stressed adults, producing social avoidance at the highest dose tested, while younger animals displays reduced sensitivity to this socially suppressing effect of Spiradoline. In stressed animals, the socially suppressing effects of the Spiradoline are blunted at all ages, with juveniles and adolescents exhibiting increased social preference in response to certain doses of U-62066^[1].

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

425.39

U-62066

C₂₂H₃₀Cl₂N₂O₂

87151-85-7

Room temperature in continental US; may vary elsewhere.

Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. Elena I Varlinskaya, et al. Stress alters social behavior and sensitivity to pharmacological activation of kappa opioid receptors in an age-specific manner in Sprague Dawley rats. Neurobiol Stress. 2018 Sep 11;9:124-132.  [Content Brief]

  [2]. M-L G Wadenberg. A review of the properties of spiradoline: a potent and selective kappa-opioid receptor agonist. CNS Drug Rev. Summer 2003;9(2):187-98.  [Content Brief]