Researchers at Texas A&M College of Veterinary Medicine and Biomedical Sciences have identified a previously unknown mechanism by which viruses can harm cells. Their study, published in Proceedings of the National Academy of Sciences, demonstrates that when RNA accumulates excessively within cells during poxvirus infections, it can impair mitochondria—the cellular structures responsible for energy generation. The findings reveal an unexpected relationship between RNA buildup and the cell’s ability to maintain adequate energy supplies.
Cells normally produce and degrade RNA as part of routine cellular maintenance, a process that helps regulate protein production and manage immune responses. However, when viral replication causes RNA production to exceed the cell’s capacity to break it down, the excess material can interfere with mitochondrial function. While scientists previously understood that double-stranded RNA could trigger harmful immune responses, the research surprisingly showed that ordinary messenger RNA can also damage mitochondria when present in excessive quantities. This presents a paradox for viruses, since they depend on infected cells to supply energy and manufacture proteins, yet generating large amounts of viral RNA can damage the cellular machinery required for viral replication.
The study’s most significant finding emerged from experiments examining the exact mechanism of mitochondrial damage. Researchers initially hypothesized that RNA buildup harmed mitochondria indirectly by activating immune system defenses. However, when they isolated mitochondria and added RNA directly, damage still occurred without immune activation. These results indicate that excess RNA itself directly interferes with mitochondrial function rather than causing damage through the body’s immune response. The researchers propose that the negatively charged RNA may accumulate near mitochondria and disrupt the electrical balance necessary for efficient energy production, though the precise mechanism remains under investigation.
Beyond viral infections, the findings raise broader questions about whether RNA accumulation contributes to other health conditions. Abnormal RNA buildup has been documented in certain cancers, neurodegenerative diseases, and age-related disorders. Since mitochondrial health is essential for overall cellular function, disruptions to energy production could potentially contribute to cellular dysfunction in various disease states. The researchers suggest excess RNA may represent a previously unrecognized source of mitochondrial stress in these contexts, though additional research is needed to determine the scope and clinical significance of this mechanism.
The discovery may also inform development of RNA-based medical treatments, including mRNA vaccines, by providing insights into how cells manage RNA levels and maintain proper function.
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