Excess RNA damages mitochondria in aging cells
Everyone knows RNA is useful for cells. But having too much of it is an unexpected finding. New research shows that an excess of RNA can directly damage the energy-producing structures inside cells.
Mitochondria are the structures in cells that generate energy. They are sensitive to external disruptions. Scientists have now discovered that surplus RNA, including normally essential messenger RNA (mRNA), can directly damage mitochondria. This happens without involvement of the immune system. The study could help explain how viral infections and certain aging-related diseases damage cells.
What is the mechanism?
RNA (ribonucleic acid) is the molecular messenger that translates information from DNA into proteins. Normally, RNA levels inside cells are tightly regulated. When a surplus arises, for example during a viral infection or disrupted cellular regulation, this excess RNA appears to be able to destabilise mitochondria. Energy production then becomes impaired.
What makes this notable: the immune system plays no role in this mechanism. That’s unexpected, because RNA-related damage has typically been linked to immune activation. This suggests a direct, immune-independent route by which RNA can harm cells.
Aging and energy production
Problems with the cell's energy-producing structures are one of the most well-established signs of biological aging. As cells grow older, these structures work less efficiently. The question has always been: what drives that decline? RNA accumulation is a new piece of that puzzle.
For longevity science, this is relevant: if excess RNA damages mitochondria, there may be new targets for therapies that protect energy production in aging cells. Whether this is clinically relevant in humans remains to be investigated. The finding is preliminary and warrants follow-up research.
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