Scientists Unlock New Insights into Healthy Ageing Through Stem Cell Research
A new study from the Agharkar Research Institute (ARI), Pune, offers fresh insight into how tissues age and lose their regenerative ability. The findings suggest that ageing may begin not within the stem cells themselves, but in the surrounding “neighbourhood” of support cells that nurture and maintain them. This discovery opens up new possibilities for understanding and promoting healthy ageing.
Support Cells: The Hidden Key to Regeneration
Researchers from ARI, an autonomous institute under the Department of Science and Technology (DST), investigated the ovaries of the fruit fly Drosophila melanogaster to study how reproductive stem cells sustain their function over time. Their study, published as a cover article in Stem Cell Reports, reveals that while germline stem cells can survive with minimal autophagy—the cell’s self-cleansing and recycling process—their neighbouring support cells, known as cap cells, are critically dependent on it for long-term maintenance.
When autophagy-related genes such as Atg1, Atg5 and Atg9 were selectively switched off in these cap cells, the cells began to accumulate damage and lose their structural integrity. Over time, they failed to send vital maintenance signals to nearby stem cells. As a result, even though the germline stem cells remained robust, they eventually disappeared from the tissue once their supportive microenvironment deteriorated.
Ageing Begins in the Neighbourhood
The research shows that ageing in this system starts with the decline of the support cells rather than the stem cells. These niche cells form a nurturing community that constantly provides biochemical cues, including Bone Morphogenetic Protein (BMP) signals, which preserve stem cell identity and drive egg production. As autophagy falters in these cells during midlife, BMP signalling weakens, causing a loss of stem cell function and linking microenvironmental decline directly to tissue ageing.
This discovery challenges the conventional belief that ageing is mainly driven by damage within individual cells. Instead, it suggests a “community” model of ageing, where the fate of stem cells depends heavily on the health of their surrounding ecosystem. The study highlights that different cell types within the same tissue possess varying resilience levels, underscoring the importance of holistic strategies when designing interventions to slow ageing.
Implications for Healthy Ageing and Regenerative Medicine
The research, led by Kiran Suhas Nilangekar and Dr Bhupendra V. Shravage of ARI’s Developmental Biology Group, positions the institute at the forefront of ageing research. The team’s findings suggest that supportive cells may act as early weak links in tissues, triggering functional decline even when stem cells remain intact.
Using Drosophila as a genetically tractable model, the researchers demonstrated how strengthening or protecting these supportive niche cells could extend stem cell function and tissue health. Because the mechanisms studied—autophagy and niche signalling—are conserved across species, the findings are expected to inform future research on mammalian tissues such as the intestine, skin, and muscle.
Going forward, the ARI team plans to examine how different cell types within tissues balance resilience and vulnerability, and whether targeted modulation of autophagy in niche cells could slow age-related degeneration. Such approaches could eventually pave the way for new strategies to preserve fertility, delay tissue decline, and promote healthier ageing in humans.
with inputs from Reuters
