In Vitro and In Vivo Characterization of the Alkaloid Nuciferine

Area of Science:

• Pharmacology
• Neuroscience
• Phytochemistry

Background:

• Sacred lotus (Nelumbo nucifera) contains numerous phytochemicals with a history of human use.
• Nuciferine, an alkaloid from Nelumbo nucifera and Nymphaea caerulea, was predicted to have a molecular profile similar to antipsychotic compounds.
• This study aimed to characterize nuciferine's pharmacological actions.

Purpose of the Study:

• To investigate the potential psychotropic effects of nuciferine, an alkaloid found in the sacred lotus.
• To characterize nuciferine's molecular and pharmacological profile using in silico, in vitro, and in vivo assays.
• To evaluate nuciferine's potential as an atypical antipsychotic agent.

Main Methods:

• In silico analysis using the similarity ensemble approach and the National Institute of Mental Health's Psychoactive Drug Screening Program.
• In vivo pharmacological assays in rodent models, including head-twitch response, pre-pulse inhibition, hyperlocomotor activity, and drug discrimination.
• Characterization of nuciferine's receptor binding profile and its effects on various behavioral paradigms relevant to antipsychotic drug action.

Main Results:

• Nuciferine demonstrated a receptor binding profile analogous to aripiprazole-like antipsychotics, acting as an antagonist, inverse agonist, partial agonist, agonist, and dopamine transporter inhibitor at various receptors (e.g., 5-HT2A, D2, 5-HT1A).
• In vivo, nuciferine modulated behaviors relevant to antipsychotic efficacy, including blocking head-twitch responses, substituting for clozapine in drug discrimination, and rescuing phencyclidine-induced deficits in prepulse inhibition.
• Nuciferine exhibited antipsychotic-like actions without inducing catalepsy and modulated locomotor activity in response to amphetamine and phencyclidine.

Conclusions:

• Nuciferine possesses an atypical antipsychotic-like molecular profile, sharing similarities with approved antipsychotic drugs.
• The pharmacological actions of nuciferine suggest its potential as a novel therapeutic agent for psychiatric disorders.
• Further research into nuciferine is warranted to explore its full therapeutic potential and mechanisms of action.