Catalog No.S2437 Synonyms: L-tetrahydropalmatine, L-THP

For research use only.

Rotundine (L-tetrahydropalmatine, L-THP) is a selective dopamine D1 receptor antagonist with IC50 of 166 nM.

Rotundine Chemical Structure

CAS No. 483-14-7

Selleck's Rotundine has been cited by 1 Publication

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Biological Activity

Description Rotundine (L-tetrahydropalmatine, L-THP) is a selective dopamine D1 receptor antagonist with IC50 of 166 nM.
D1 receptor [1] 5-HT1A [1] D2 receptor [1] D3 receptor [1]
166 nM 347 nM 1.47 μM 3.25 μM
In vitro

Rotundine displays a higher affinity to dopamine D1 than D2 receptor with Ki of 124 nM and 388 nM, respectively, while the IC50 values are 166 nM (D1) and 1.47 μM (D2), respectively. Rotundine exhibits a weak inhibitory activity against dopamine D3 with IC50 of 3.25 μM. Rotundine also potently inhibits 5-HT1A with IC50 of 374 nM and Ki of 340 nM. In addition to the antagonism of postsynaptic dopamine receptors, inhibition of presynaptic autoreceptors by Rotundine leads to increased dopamine release, which is probably attributed to lower affinity of Rotundine for D2 receptors. Along with dopamine receptors, Rotundine can interact with a number of other receptor types, including α-1 adrenergic receptors, at which it functions as an antagonist, and γ-aminobutyric acid receptors, at which it facilitates γ-aminobutyric acid binding through positive allosteric effects. [1]

In vivo Rotundine treatment does not affect the locomotor activity at the doses of 6.25 mg/kg, 12.5 mg/kg, or 18.75 mg/kg, but significantly antagonizes the hyperactivity induced by oxycodone (5 mg/kg). [2] Oral administration of Rotundine (10-25 mg/kg) significantly increases hot-plate latency of mice, indicating that Rotundine exerts remarkable analgesic activity, which is associated with β-endorphin neurons in the arcute nucleus and supraspinal D2 receptor. [3] Administration of Rotundine (1-10 mg/kg) dose-dependently increases, while 20 mg/kg decreases the rate of cocaine self-administration under fixed-ratio (FR) reinforcement, due to a postsynaptic, rather than presynaptic, DA receptor blockade mechanism. In contrast to the effects on cocaine's actions, only the 10 mg/kg dose of Rotundine but not 1 mg/kg or 3 mg/kg produces inhibitory effect on sucrose self-administration and locomotion. [4] LD50: Mice 1160mg/kg (i.g.) [5]

Protocol (from reference)

Animal Research:[3]
  • Animal Models: Female ICR mice subjected to hot plate latency assay
  • Dosages: 25 mg/kg
  • Administration: Oral administration

Solubility (25°C)

In vitro

Chemical Information

Molecular Weight 355.43


CAS No. 483-14-7
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles COC1=C(C2=C(CC3C4=CC(=C(C=C4CCN3C2)OC)OC)C=C1)OC

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