Endogenous DMT, lungs
DMT synthesis gene credibility check
Can we get a credible source for this?
"we do know that the gene involved in DMT synthesis is present in many organs, particularly lung." Rick Strassman, M.D. Quoted here: DMT and the Pineal: Fact or Fiction? Jon Hanna. 2010-06-03, 2017-12-14. https://erowid.org/chemicals/dmt/dmt_article2.shtml
Yes — Strassman's claim is well-supported by peer-reviewed literature. The key gene/enzyme is INMT (indolethylamine-N-methyltransferase), which catalyzes DMT synthesis. Here are credible sources:
Strongest sources:
- Thompson et al. (1999) — the original molecular biology paper cloning human INMT and mapping its tissue distribution via Northern blot. INMT is widely expressed in the body, primarily in peripheral tissues such as the lungs, thyroid, and adrenal gland. [ 1 ] This is the foundational citation for Strassman's claim.
- Barker et al. (2018) in Scientific Reports (Nature): High levels of INMT mRNA expression were found in rat kidney, lung, heart, and adrenal, consistent with earlier Northern blot analysis of human tissues. [ 2 ] Available at: https://www.nature.com/articles/s41598-019-45812-w
- Frecska et al. / NIH/PMC review: Endogenous DMT has been confirmed in several tissues in humans, rats, and rabbits, including lung and brain. [ 3 ] (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC5924808/)
One nuance worth noting: More recent research has complicated the picture. A 2023 study found that brain and lung tissues from both wild-type and INMT-knockout rats show equal levels of tryptamine-dependent activity, but that the enzymatic products are neither NMT nor DMT [ 4 ] — suggesting INMT's exact role in DMT biosynthesis is still being worked out.
So the core claim — that the INMT gene is expressed prominently in the lung — is solid and peer-reviewed. The broader implication that the lung is a major source of endogenous DMT remains an active area of research.
[ 1 ] https://pmc.ncbi.nlm.nih.gov/articles/PMC5048497/
[ 2 ] https://www.nature.com/articles/s41598-019-45812-w
[ 3 ] https://pmc.ncbi.nlm.nih.gov/articles/PMC5924808/
[ 4 ] https://pubmed.ncbi.nlm.nih.gov/36609666/
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