Environmental lead exposure linked to greater neuronal damage: ICMR-NIN

Researchers at the ICMR-National Institute of Nutrition (ICMR-NIN), Hyderabad, have found that exposure to lead can significantly disrupt the natural waste-clearing and recycling system of nerve cells, providing fresh insight into how environmental factors may contribute to cellular changes associated with neurodegenerative disorders such as Alzheimer’s disease.

The study examined the effects of lead and amyloid-beta (Aβ) peptides, protein fragments associated with Alzheimer’s disease, on human neuronal cells in the laboratory. Nerve cells rely on lysosomes, tiny structures within cells that act as a waste-disposal and recycling system. They break down damaged proteins and other unwanted cellular material, helping maintain cellular health and function.

The researchers found that exposure to either lead or amyloid-beta peptides individually impaired lysosomal function. However, combined exposure caused significantly greater disruption as it reduced cell survival, disturbed the acidic environment required for normal lysosomal function and damaged lysosomal structure.