Heavy metals like lead and mercury are often thought of as “solved problems” that we have tirelessly studied for decades. These are hazards we already understand and have learned to potentially control. But the “Neurotoxicity: Metals” Poster Session at the 2026 SOT Annual Meeting and ToxExpo made one thing clear: metal neurotoxicity is far from a closed chapter. Instead, researchers are uncovering new ways that common, real‑world metal exposures may shape brain health across the lifespan.
Across dozens of posters, a few clear themes emerged. First, many studies focused on low‑level and early life exposures, rather than dramatic acute poisonings. Researchers repeatedly showed that even subtle exposures during development can lead to long-lasting changes in the brain that affect memory, mood, and behavior and make organisms more vulnerable to disease much later on in life. The message was consistent across the metals that were most commonly studied in the session, including lead, manganese, cadmium, chromium, and mercury: early exposure can leave a longstanding neurological footprint.
Another major takeaway was that neurotoxicity isn’t just about neurons. Many posters emphasized the role of the brain’s support and immune cells, such as microglia and astrocytes. They discussed how metals can push these cells toward chronic inflammation. This shift toward neuroinflammation and disrupted brain support systems helps explain why metal exposure is increasingly linked to neurodegenerative diseases such as Alzheimer’s and Parkinson’s.
Researchers also highlighted how real life is messy, meaning that people are almost never just exposed to one metal, and responses are rarely the same for everyone. Several posters examined metal mixtures, sex‑specific effects, and gene–environment interactions, showing that biology plays a major role in who is most vulnerable and why. In other words, risk depends not only on exposure, but on who you are.
Finally, this session showcased how rapidly science is evolving. From human stem cell–derived brain models and advanced imaging to microbiome‑based interventions, researchers are using new tools to ask better questions, as well as exploring new ways to reduce harm and not just measure it.
The moral of the story at this Poster Session was clearly that neurotoxic metals remains a public health issue and not just a relic of the past that we should move on from studying. As science becomes more precise and more human relevant, it is revealing how everyday exposures can interact with development, biology, and aging in ways we are only just beginning to understand.
This blog reports on the Poster Session titled “Neurotoxicity: Metals” that was held during the 2026 SOT Annual Meeting and ToxExpo.
This blog was prepared by an SOT Reporter and represents the views of the author. SOT Reporters are SOT members who volunteer to write about sessions and events in which they participate during the SOT Annual Meeting and ToxExpo. SOT does not propose or endorse any position by posting this article. If you are interested in participating in the SOT Reporter program in the future, please email SOT Headquarters.
#SOTReporter