ICMR-NIN Study Links Lead Exposure to Nerve Cell Damage, Especially with Amyloid-Beta
A study by researchers at the ICMR-National Institute of Nutrition (ICMR-NIN) in Hyderabad has found that exposure to lead may damage nerve cells, particularly when it occurs alongside amyloid-beta, a protein associated with changes seen in certain brain diseases. The findings, published in the Journal of Applied Toxicology, suggest that environmental lead exposure could amplify cellular stress and make nerve cells more vulnerable to injury.
Study Details and Methodology
The research team, led by Dr. Suresh Challa, scientist and head of cell biology at ICMR-NIN, tested the effects of lead and two forms of amyloid-beta peptides on human nerve cells in a laboratory setting. Amyloid-beta peptides are protein fragments that have long been associated with Alzheimer’s disease. The researchers examined how these substances affected lysosomes—tiny structures within cells that act as a waste-disposal and recycling system, breaking down damaged proteins and other unwanted cellular material to maintain cellular health.
Key Findings: Combined Exposure Causes Greater Damage
According to the study, exposure to either lead or amyloid-beta individually impaired lysosomal function. However, when nerve cells were exposed to both simultaneously, the damage was significantly greater. The combined exposure reduced cell survival, disturbed the acidic environment required for normal lysosomal function, and damaged lysosomal structure. Additionally, lysosomal membranes became weak and permeable, potentially allowing harmful substances—including enzymes—to escape into the cell and cause further damage.
The researchers noted that these effects also involved changes in proteins and genes that help maintain lysosomal health. The study suggests that lead exposure may worsen lysosomal dysfunction in the presence of amyloid-beta, potentially contributing to the cellular changes seen in neurodegenerative disorders.
Researchers’ Remarks
Dr. Suresh Challa, who led the study, said, “Our findings show that lead exposure can significantly worsen lysosomal dysfunction in the presence of amyloid-beta.” He added that understanding these cellular changes could help explain how environmental exposure affects nerve health.
Dr. Bharati Kulkarni, Director of ICMR-NIN, emphasized the broader implications of the research, stating, “The study highlights the importance of understanding how environmental pollutants interact with the body.” She further noted that such research could help scientists better understand the biological processes involved in brain diseases.
The study provides new insight into how environmental factors, such as lead exposure, might interact with biological factors like amyloid-beta to influence neuronal health, potentially informing future research on prevention and intervention strategies for brain diseases.