A recent study found DMT in microdialysate obtained from a rat’s pineal gland, providing evidence of endogenous DMT in the mammalian brain.
The study called “LC/MS/MS analysis of the endogenous dimethyltryptamine (DMT) hallucinogens, their precursors, and major metabolites in rat pineal gland microdialysate” was completed in Dr. Steven Barker’s laboratory at Louisiana State University, using methods that funding from the Cottonwood Research Foundation helped develop.
“The pineal gland has been an object of great interest regarding consciousness for thousands of years, and a pineal source of DMT would help support a role for this enigmatic gland in unusual states of consciousness. Research at the University of Wisconsin has recently demonstrated the presence of the DMT-synthesizing enzyme as well as activity of the gene responsible for the enzyme in pineal (and retina). Our new data now establish that the enzyme actively produces DMT in the pineal” was communicated.
In humans, a gene encoding INMT is determined to be located on chromosome 7. Northern blot analyses reveal INMT messenger RNA (mRNA) to be highly expressed in rabbit lung, and in human thyroid, adrenal gland, and lung. Intermediate levels of expression are found in human heart, skeletal muscle, trachea, stomach, small intestine, pancreas, testis, prostate, placenta, lymph node, and spinal cord. Low to very low levels of expression are noted in rabbit brain, and human thymus, liver, spleen, kidney, colon, ovary, and bone marrow. INMT mRNA expression is absent in human peripheral blood leukocytes, whole brain, and in tissue from 7 specific brain regions (thalamus, subthalamic nucleus, caudate nucleus, hippocampus, amygdala, substantia nigra, and corpus callosum). Immunohistochemistry showed INMT to be present in large amounts in glandular epithelial cells of small and large intestines, and to be absent in neurons.
Previous surveys, made in research articles, point that few of the analytical methods previously used to measure levels of endogenously formed DMT had enough sensitivity and selectivity to produce reliable results. Gas chromatography, preferably coupled to mass spectrometry (GC-MS), is considered a minimum requirement. A study published in 2005 implements the most sensitive and selective method ever used to measure endogenous DMT: liquid chromatography-tandem mass spectrometry with electrospray ionization (LC-ESI-MS/MS) allows to reach limits of detection (LODs) 12 to 200 fold lower (that is, better) than those attained by the best methods employed in the 1970s. The data summarized in the table below are from studies conforming to the abovementioned requirements (abbreviations used: CSF = cerebrospinal fluid; LOD = limit of detection; n = number of samples; ng/L and ng/kg = nanograms (10−9 g) per litre, and nanograms per kilogram, respectively):
The first claimed detection of mammalian endogenous DMT was published in June 1965: German researchers F. Franzen and H. Gross report to have evidenced and quantified DMT, along with its structural analog bufotenin (5-OH-DMT), in human blood and urine. In an article published four months later, the method used in their study is strongly criticized, and credibility of their results challenged.
