ICMR-NIN Hyderabad Study Finds Lead Exposure Damages Nerve Cell Waste Recycling System

Researchers at the ICMR-National Institute of Nutrition (ICMR-NIN) in Hyderabad have discovered that exposure to lead can significantly disrupt the natural waste-clearing and recycling mechanisms of nerve cells. The findings offer fresh insight into how environmental contaminants may drive cellular changes linked to neurodegenerative conditions such as Alzheimer’s disease.

The laboratory study evaluated the impact of lead and amyloid-beta (Aβ) peptides—protein fragments associated with Alzheimer’s disease—on human neuronal cells. Nerve cells depend on lysosomes, which are specialised microscopic structures that serve as a waste-disposal and recycling network. Under normal conditions, lysosomes break down damaged proteins and cellular debris to support cell survival and overall function.

According to the study, exposure to either lead or amyloid-beta peptides alone impaired lysosomal performance. However, combined exposure to both elements triggered substantially higher levels of cellular disruption. The dual exposure reduced overall cell survival rates, altered the acidic internal environment required for normal lysosomal activity, and physically damaged the lysosomal structure.

The researchers observed that lysosomal membranes turned unstable and permeable under these conditions. This leakage could permit destructive enzymes to escape into the wider cell environment, compounding cellular injury. The team noted that environmental lead exposure appears to amplify the cellular stress caused by amyloid-beta, making nerve cells far more vulnerable to sustained damage.

Suresh Challa, Head of Cell Biology at ICMR-NIN, who headed the research team, stated that understanding these cellular changes helps clarify how environmental factors can influence neuronal health over time.

ICMR-NIN Director Bharati Kulkarni noted that the findings underscore the importance of examining interactions between environmental pollutants and biological factors to better understand brain health maintenance.