ICMR-NIN Hyderabad Study Finds Lead Exposure Aggravates Alzheimer's Damage

Researchers at the National Institute of Nutrition (ICMR-NIN) in Hyderabad have found that exposure to environmental lead, particularly in the presence of amyloid-β peptides, significantly disrupts the natural waste-clearing system of nerve cells and may intensify cellular damage linked to Alzheimer’s disease.

Amyloid-β peptides play a central role in Alzheimer’s disease pathology. According to the study, environmental lead exposure adds to the cellular stress associated with these peptides, leaving nerve cells increasingly vulnerable to damage. The findings provide critical insight into how environmental factors may contribute to cellular changes associated with neurodegenerative disorders like Alzheimer's disease and dementia.

The study, published in the international journal Journal of Applied Toxicology, examined the effects of lead and two forms of amyloid-β peptides on human neuronal cells in a laboratory setting.

The researchers found that while exposure to lead or amyloid-β peptides individually caused some damage to lysosomal function, combined exposure caused substantially greater disruption. In a press release, NIN researchers explained that the combined exposure reduced cell survival, disturbed the acidic environment required for lysosomes to function normally, and damaged their cellular structure.

Dr Suresh Challa, Scientist-G and Head of Cell Biology at ICMR-NIN, who led the research team, said, “Our findings show that lead exposure can significantly worsen lysosomal dysfunction in the presence of amyloid-β. Understanding these cellular changes can help us better understand how environmental exposures may influence neuronal health.”

Dr Bharati Kulkarni, Director of ICMR-NIN, noted, “The study highlights the importance of understanding the interaction between environmental pollutants and biological factors in maintaining brain health.”