Researchers from the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bengaluru, have made a significant scientific breakthrough by identifying a crucial component involved in autophagy, the body’s natural process of cleaning damaged cellular material.
This discovery holds major promise for developing new therapies for neurodegenerative diseases such as Alzheimer’s and Parkinson’s, as well as for cancer treatment.
Autophagy, often described as a cell’s ‘self-cleaning’ or ‘self-eating’ process, helps remove damaged proteins, organelles, and waste material.
This process is essential for maintaining cellular health, especially in long-lived cells like neurons.
When autophagy fails, waste accumulates, leading to cellular dysfunction and disease.
Disruption of the autophagy pathway has been linked to several disorders, including Alzheimer’s, Huntington’s disease, and Parkinson’s.
In cancer, autophagy plays a complex dual role—while it can suppress tumour formation in early stages, some cancer cells later exploit it to survive and multiply.
Role of the Exocyst Complex
The JNCASR team, led by Professor Ravi Manjithaya, discovered that the exocyst complex—a group of proteins previously known for transporting molecules to the cell surface—also plays a vital role in autophagy.
The exocyst complex consists of eight proteins. The researchers found that seven of these proteins are essential for forming autophagosomes, the specialised structures that act like ‘trash bags’ to collect and dispose of cellular waste.
When this complex is absent or dysfunctional, the autophagosome formation process breaks down, leading to defective cellular cleanup systems.
To uncover this mechanism, the scientists used yeast cells as a model system.
Despite their simplicity, yeast cells share many biological processes with higher organisms, making them ideal for studying fundamental cellular functions.
Through this research, the team demonstrated how the exocyst complex contributes directly to autophagosome formation, revealing a previously unknown connection between secretion pathways and autophagy.
The findings are particularly important because defects in autophagy strongly contribute to neurodegenerative diseases and cancer.
In healthy cells, autophagy maintains genome stability and cellular balance by removing damaged mitochondria and protein aggregates.
However, cancer cells can hijack this process to support their own growth and survival.
Understanding how autophagy is regulated at the molecular level is crucial for designing effective therapies.
By targeting the exocyst complex, scientists may be able to restore normal autophagy or selectively disrupt it in cancer cells.
The study, published in the Proceedings of the National Academy of Sciences, opens new avenues for modulating autophagy to restore cellular balance.
This discovery marks an important step forward in biomedical research and highlights India’s growing contribution to cutting-edge scientific innovation.
With further research, these insights could lead to more effective treatments for some of the most challenging diseases affecting humanity today.
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