ICMR-NIN Study: Lead Exposure Worsens Cell Damage Linked to Alzheimer's Protein

Researchers at the Hyderabad-based ICMR-National Institute of Nutrition (ICMR-NIN) have found that exposure to environmental lead, particularly in the presence of amyloid-beta peptides, protein fragments that play a central role in the pathology of Alzheimer's disease, can significantly disrupt the natural waste-clearing system of nerve cells. The study was published in the international journal Journal of Applied Toxicology.

The researchers examined the effects of lead and two forms of amyloid-beta peptides on human neuronal cells in the laboratory. Exposure to lead or amyloid-beta individually caused some damage to lysosomal function, the cell's internal waste-disposal system, NIN researchers said in a statement. Combined exposure, however, caused much greater disruption: it reduced cell survival, disturbed the acidic environment lysosomes need to function normally, and damaged their structure.

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

The findings suggest that environmental lead exposure may add to the cellular stress already associated with amyloid-beta, making nerve cells more vulnerable to damage, and they offer further insight into how environmental factors may contribute to cellular changes associated with neurodegenerative disorders such as Alzheimer's disease and dementia. Dr. Bharati Kulkarni, Director of ICMR-NIN, said the study highlights the importance of understanding the interaction between environmental pollutants and biological factors in maintaining brain health.