The metallome, and why a single metal is not enough
According to Amin Gasmi, the toxic metallome includes all the metals likely to be toxic to the body, in two broad categories: metals that are toxic by nature, and essential trace elements that become toxic beyond a certain threshold. Iron, copper, selenium and zinc belong to the second.
This distinction is not merely theoretical. The toxicity of a metal depends on its chemical form, its tissue distribution, the body's capacity to excrete it and its interactions with the other elements of the metallome. Elemental mercury, most often taken in by inhalation, is poorly excreted by the kidneys. Methylmercury leaves the body more easily, but readily accumulates in the nervous system.
Sources of exposure mentioned during the session
- Lead: old paints, dust, occupational exposure, some old utensils.
- Cadmium: smoking, diet, phosphate fertilisers.
- Mercury: fish, as methylmercury; industrial vapours for inorganic mercury.
- Arsenic: environmental and dietary exposure, rice in particular.
Exposure and poisoning are not the same thing
This is the point both speakers were keenest to get across. "You can have two people who live in the same place, who do the same things, who have roughly the same characteristics. One who has major poisoning by three or four toxic metals, and the other who has nothing," sums up Amin Gasmi. In his view, when poisoning is extreme and involves several metals, genetic determinism is most often the cause.
Two examples were developed. The ApoE4 genotype, and even more so E4/E4 homozygosity, is described as the least favourable for mercury accumulation in the brain, as the transporters concerned are involved in mercury clearance from the nervous system. The GSTM1 gene deletion, present according to the speaker in around one person in two in the Caucasian population, influences the capacity to clear mercury. More than forty polymorphisms are thought to contribute to determining the capacity to accumulate and retain toxic metals.
One transporter for two metals
Toxic metals have no dedicated transporters. They borrow those of the trace elements whose chemical properties they partly share. The DMT1 transporter, involved in iron transport, also carries cadmium. A genetic variation that reduces its affinity for iron and increases its affinity for cadmium is enough to shift the balance between the two over the long term.
What tests actually measure
According to Amin Gasmi, blood and urine tests document recent or very recent exposure, and nothing else. Repeating them over several months documents a longer exposure, but still does not give a direct measure of the tissue store. Hair analysis, when carried out properly, does give a direct measure of accumulation in a tissue, over a window corresponding to the lifespan of the hair, that is, two and a half to three years.
Interpretation gains most from being comparative. Measuring lead alone says little; measuring lead together with the trace elements that compete with it, iron first and foremost, makes it possible to estimate whether the level observed is consistent with the patient's micronutrient status. A mismatch points to another factor: heavy exposure, severe dysbiosis, or a genetic variation in a transporter.
Speciation, a frequent blind spot
Urinary arsenic is most often reported as total arsenic. It is the inorganic form that carries most of the toxicity, with the liver biotransforming part of the rest. Without speciation, a high result does not say to what extent the body is properly metabolising what it receives. The same applies to mercury.
What chelation is, and what it is not
Amin Gasmi proposes a strict definition: a chelating agent enters the cell, forms a complex with the metal, and comes back out. Transport into the general circulation, hepatic biotransformation and renal or biliary excretion follow, but are not part of chelation itself. A diuretic herb increases the excretion of what is already circulating; it does not go after what is stored in the tissues.
The practical consequence is direct. "You cannot say that the universal chelator is smart enough, so to speak, to target only the toxic metals and spare the trace elements. In reality, it chelates everything," he warns. In a patient who is already deficient, chelation carried out alone deepens the deficit that encouraged accumulation in the first place, and can therefore make worse the very situation it is aimed at. To him, the reasoning "poisoning, therefore chelation" is as simplistic as "infection, therefore antibiotic".
The gut microbiota, an often overlooked interface
Christian Boyer devoted his part to a two-way relationship. On one side, a balanced microbiota limits the absorption of metals and contributes to their excretion. On the other, exposure to metals changes the composition and metabolic activity of the microbiota.
Four mechanisms
- Bioprecipitation: sulphate-reducing bacteria precipitate cadmium, lead and mercury in an insoluble form, which leaves in the stools.
- Bioassimilation: some bacteria internalise metals, which leave the body with them.
- Biosorption: metals bind to bacterial walls, peptidoglycan, teichoic acids and above all exopolysaccharides, whose negatively charged carboxyl and phosphate groups form complexes. Strains of Lactobacillus fermentum and Lactobacillus plantarum come up regularly in the literature cited.
- Biotransformation: methylation lowers the toxicity of arsenic, but increases it for mercury, since it produces methylmercury.
Digestive secretions matter too. In a Caco-2 cell model, intestinal extracts alone already reduce the permeability of arsenic, cadmium, mercury and lead; adding bacteria reduces it further. Bile salts can form complexes with cadmium, which makes bile quality a parameter in its own right.
The double penalty of dysbiosis
A study cited during the session illustrates the size of the effect. In mice made dysbiotic by antibiotic treatment and then exposed to cadmium and arsenic through contaminated rice, liver and kidney accumulation increased by 30 to 119% compared with animals with a normal microbiota. The effect appears to be linked to degradation of the mucus and impairment of the tight junctions. Conversely, giving probiotics and prebiotics partly restores the gut barrier and reduces tissue accumulation.
Christian Boyer also notes that a high abundance of Collinsella in a microbiota could be a marker pointing towards heavy metal exposure. He stresses the conditional: it is a signal that invites further investigation, not a diagnosis.
The four-step approach
- Reduce exposure first. "It is not about starting to try to chelate someone while they carry on eating four tins of tuna a week," Christian Boyer points out.
- Support the emunctories and check that phases I, II and III of xenobiotic clearance are working. Phase II, with its conjugation reactions, is presented as the most decisive.
- Work on the microbiota and intestinal permeability, in the light of the data above.
- Chelate only after that, distinguishing intestinal agents from systemic agents.
Intestinal chelators and systemic chelators
Zeolite, activated charcoal and soluble fibre act in the intestinal lumen: they capture what arrives via the bile and limit reabsorption, but do not circulate in the body and therefore do not go after metals stored in the tissues. Alpha-lipoic acid, in its reduced form, is described as a chelator with broad systemic action. N-acetylcysteine and glutathione mainly target mercury, via cysteine. Vitamin C, which regenerates glutathione, and melatonin were mentioned with weaker levels of evidence. EDTA and DMSA, for their part, are medicines.
Correcting deficiencies, a lever in its own right
The antagonisms described are numerous: iron and lead, iron and cadmium, calcium and lead, zinc and copper, selenium and mercury, silicon and aluminium. These are not chelations, but competition for transporters or complexation, which lower biological vulnerability. Raising ferritin from 40 to 80, when the patient's context allows it, reduces how easily lead and cadmium accumulate. A study of 132 adults cited during the session reports a fall of more than 13% in blood arsenic after twelve weeks of folic acid, against 2.5% on placebo, methylation being one of the phase II reactions.
The chelation cycle in practice
Amin Gasmi describes a three-stage cycle: a preparation phase of two to four weeks, which acts on exposure and on how the excretory organs are functioning; an intervention phase, in which the chelator is given, two to three months for a gentle agent; then a recovery phase, guided by a micronutrient assessment, which lasts as long as it takes to correct the deficits created. Two to five cycles are generally needed. If there are significant deficiencies at the outset, there is no chelation: deficiencies are corrected first.
What practitioners can take away on Monday
The two speakers' message fits in one sentence: a single metal only tells part of the story. A high urinary result without reading trace element status, without an exposure history and without looking at the gut leads to fragile decisions. The metallome, by contrast, puts the result back into the terrain that produces it.
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