Glaucine

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Glaucine (also known as 1,2,9,10-tetramethoxyaporphine, bromcholitin, glauvent, tusidil, and tussiglaucin) is an aporphine alkaloid found in several different plant species in the family Papaveraceae, such as Glaucium flavum,[1] Glaucium oxylobum, and Corydalis yanhusuo,[2][3] and in other plants such as Croton lechleri in the family Euphorbiaceae.[4]

It has bronchodilator, neuroleptic[5] and antiinflammatory effects, acting as a PDE4 inhibitor and calcium channel blocker,[6] and is used medically as an antitussive in some countries.[7] TLRs plays role in its anti inflammatory effects.[8] Glaucine may produce side effects such as sedation, fatigue, and a hallucinogenic effect characterised by colourful visual images,[9][10] and has been detected as a novel psychoactive drug.[11] In a 2019 publication,[12] the isomer (R)-glaucine is reported to be a positive allosteric modulator of the 5-HT2A receptor, which is also associated with the hallucinogenic effects of substances such as psilocybin and mescaline.

Chemistry

Stereoisomerism

It was believed that only the (S)-form of glaucine occurs in nature until (R)-glaucine was found in fire poppy (Papaver californicum).[13]

Glaucine
(2 stereoisomers)
(S)-Glaucine
(S)-configuration 		(R)-Glaucine
(R)-configuration

Mechanism of action

Glaucine binds to the benzothiazepine site on L-type Ca2+-channels, thereby blocking calcium ion channels in smooth muscle like the human bronchus. Glaucine has no effect on intracellular calcium stores, but rather, does not allow the entry of Ca2+ after intracellular stores have been depleted.[6] Ca2+ influx is a vital component in the process of muscular contraction, and the blocking of this influx therefore reduces the ability of the muscle to contract.[14] In this way, glaucine can prevent smooth muscle from contracting, allowing it to relax.

Glaucine has also been demonstrated to be a dopamine receptor antagonist, favoring D1 and D1-like receptors.[11][15] It is also a non-competitive selective inhibitor of PDE4 in human bronchial tissue and granulocytes. PDE4 is an isoenzyme that hydrolyzes cyclic AMP to regulate human bronchial tone (along with PDE3). Yet as a PDE4 inhibitor, glaucine possesses very low potency.[6]

Glaucine has also recently[12] been found to have an effect on the neuronal 5-HT2A receptors, which are responsible for the hallucinogenic effects of classical psychedelics. It also inhibits MAO enzymes.[16] Its enantiomers effect are same for adrenergic receptor yet different for 5-HT receptor. Both (R)-glaucine and (S)-glaucine antagonize α1 receptor, but (S)-glaucine is partial agonist of 5-HT2 subtypes whereas (R)-glaucine is a positive allosteric modulator of 5-HT2.[17]

Uses

Medical

It is currently used as an antitussive agent in Iceland, as well as Romania, Bulgaria, Russia and other eastern European countries.[6][11] Bulgarian pharmaceutical company Sopharma sells glaucine in tablet form, where a single dose contains 40 mg and the half-life is indicated to be 6–8 hours. When ingested orally has been shown to increase airway conductance in humans, and has been investigated as a treatment for asthma.[6]

Glaucine has been reported to reduce blood pressure, heart rate and possess anticonvulsant and antinoiciceptive effect in animals.[18][19]

Recreational

Reports of recreational use of glaucine have recently been published, and effects include dissociative-type symptoms; feeling detached and 'in another world', as well as nausea, vomiting and dilated pupils. These reports mirror those about the effects of clinical use, which state dissociative-type symptoms as well as lethargy, fatigue, hallucinations.[10][11] Investigation of side effects in a clinical setting also reports that the hallucinatory effects manifest as bright and colorful visualizations. They also report that patients perceive their environments clearly yet feel detached from it; "the patient sees and understands everything and is oriented well enough, but cannot take a clear and adequate action".[10]

One particular report of recreational use gone awry described the form of distribution as tablets being marketed as a 1-benzylpiperazine (BZP)-free "herbal high" which the patient referred to as "head candy".[11]

See also

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References

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  12. ↑ a b Heng, HL, Chee, CF, Thy, CK, et al. In vitro functional evaluation of isolaureline, dicentrine and glaucine enantiomers at 5‐HT2 and α1 receptors. Chem Biol Drug Des. 2019; 93: 132– 138. https://doi.org/10.1111/cbdd.13390
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Nestler E, Hyman S & Malenka R. Molecular Neuropharmacology: A Foundation for Clinical Neuroscience (2nd ed.). China: McGraw-Hill Companies.
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