When you bring telomerase RNA levels down by using a mechanism that targets the RNA for destruction, the cells which were running on very high telomerase levels are now running on a lean diet of telomerase.

Elizabeth Blackburn’s quote addresses the role of telomerase RNA in cellular function and its potential implications for aging and disease. Telomerase is an enzyme that plays a crucial role in maintaining the length of telomeres, the protective caps at the ends of chromosomes. When telomerase is active, it helps prevent the shortening of telomeres, which is a key factor in cellular aging. Blackburn’s statement suggests that reducing telomerase RNA levels can influence this process, effectively "slowing down" the activity that helps maintain telomere length.

The phrase "running on a lean diet of telomerase" metaphorically conveys the idea that, by targeting and degrading the telomerase RNA, cells are no longer able to function with the same high levels of telomerase activity. In this scenario, the cells are operating with reduced telomerase, akin to a reduced or more restricted form of metabolic function. This could potentially limit their ability to maintain telomere length and affect their lifespan.

Blackburn’s statement highlights the potential therapeutic implications of controlling telomerase RNA levels. By targeting this RNA for destruction, scientists may be able to control the cellular processes related to aging and disease, such as cancer, where telomerase activity is often abnormally high. This suggests that modulating telomerase levels could be a strategy for influencing the progression of age-related conditions or halting the uncontrolled division of cancer cells.

In essence, the quote reflects the cutting-edge nature of Blackburn’s research into telomeres and telomerase, offering a glimpse into how manipulating these cellular mechanisms could have profound effects on aging and disease treatment. It underscores the delicate balance of biological processes and the potential benefits of controlling them at a molecular level.