autumnsphere said:
My basic knowledge is that the brain synthesizes DMT from serotonin (through melatonin), and that dopamine and serotonin peak during a DMT trip. My question is: are there DMT neurons (i.e. where the DMT molecule latches on) and what happens with serotonin and dopamine during a DMT trip - does the DMT cause a spike in them, how and why?
Thanks for your patience!
While there are no "dedicated" "DMT neurons", DMT does bind to some serotonin receptors and some dopamine receptors, but the closest thing to a dedicated receptor may be that some neurons have a "Sigma-1 receptor" which does respond specifically to DMT, and may be partially responsible for the hallucinogenic effects. From Wiki entry on Sigma receptors in general:
"The function of these receptors is poorly understood[4] though an endogenous ligand, dimethyltryptamine, was found to interact with σ1.[5][6] Activation of σ–receptors by an agonist ligand may induce hallucinogenic effects"...
..."A variety of specific physiological functions have been attributed to the σ1 receptor. Chief among these are modulation of Ca2+ release, modulation of cardiac myocyte contractility, and inhibition of voltage gated K+ channels.[13] The reasons for these effects are not well understood, even though σ1 receptors have been linked circumstantially to a wide variety of signal transduction pathways."
These kind of receptors fall into a recently discovered (2001) class of receptors called TAARs, or Trace amine-associated Receptors.
As for a path of biosynthesis for DMT, the only one I know of for sure is via tryptophan. Serotonin is also made from tryptophan, but I have not seen the full pathways for serotonin conversion into DMT (see below).
Usually what happens is that something called AADC catalyzes a "decarboxylation reaction" which turns tryptophan in to Tryptamine. Then an enzyme called INMT catalyzes a methylation
reaction that turns the tryptamine into N-Methyltryptamine. It does it again, adding a second methyl group, and BOOM you have Di-MethylTryptamine produced by the body, in the body.
This INMT enzyme is found in the lungs, cerebral spinal fluid, the eyes, etc. I have experienced powerful visionary states from doing pranayama breathing, so I believe both from a scientific and experiential standpoint that this enzyme in the lungs can be released in larger quantities than normal to produce at least some small amount of DMT. It may be that in conjunction with this the Pineal gland releases beta-carbolines that act as a weak MAO Inhibitor that helps prolong the effect of the DMT. The pineal gland is thought to produce substances like Pinoline that could do this, but this has not been proven conclusively to my knowledge.
There could be a way that Melatonin is decarboxylated directly into DMT, but if there is it is not presently known. That would answer a lot of questions, and would explain the idea of the pineal gland being involved in DMT production, etc., but as of right now even the top organic chemicistry experts on DMT like Steven Barker from The Spirit Molecule movie do know know of any such direct melatonin decarboxylation to DMT pathway.
In terms of less direct pathways, this paper claims that melatonin can be deacetylated to 5-methoxytryptamine which can then be metabolized to things like pinoline, bufotenine, DMT, etc.:
But they did not list the exact pathways, if anyone here knows what they are that would be really helpful. I have seen these pathways also mentioned indirectly in manuals on darkroom retreats by Mantak Chia et. al. but again the exact pathways are not specified.
So that was pretty long and verbose, but hopefully somewhat helpful. I am fascinated by the subject of how and why these chemicals are produced in our bodies!