Peroxisomes and mitochondria age together in cells
Tiny cell structures that rarely make headlines turn out to play a key role in aging. When they disappear, the cell’s energy factories deteriorate faster. But the process can be slowed.
Every cell contains hundreds of small, specialised structures. Peroxisomes (organelles that break down fats and neutralise harmful compounds) are among them. They have received little attention in aging research, but that is changing. Researchers had already shown that peroxisomes are massively degraded during early aging through a process called pexophagy. Now, in a new study, they reveal how this connects to broader cellular aging.
Mitochondria stay younger when peroxisomes are preserved
The team worked with the roundworm Caenorhabditis elegans. They inhibited the protein PRX-11, which normally promotes peroxisome fission and degradation. This preserved more peroxisomes in older worms. Strikingly, the mitochondria (the cell’s energy factories) also benefited. Older worms lacking PRX-11 had mitochondria that still looked young, with an elongated, tubular shape rather than the fragmented form typically seen in aging.
According to the researchers, this is not a one-way street. When mitochondria were experimentally disrupted, pexophagy accelerated too. The two organelle types appear to monitor each other’s condition and age in tandem. Several proteins were required for this effect, including FZO-1, UNC-43, and DAF-16. Disabling any one of them abolished the lifespan extension normally produced by PRX-11 inhibition.
What this means for longevity research
This is a promising finding for longevity science, though the work was done in roundworms. The idea that two types of organelles govern each other’s aging opens a new line of thinking. Research has largely focused on mitochondria or on autophagy (the cellular cleanup process that removes damaged components). The notion that peroxisomes play a directing role is relatively new.
Whether inhibiting PRX-11 or similar proteins would work in mammals remains unknown. The study was published in the journal Aging. For now, this stands as a mechanistic clue: peroxisomes and mitochondria are not isolated parts but act as an integrated system that co-determines cellular health and lifespan.
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