New research highlights the potential role of mitochondrial supercomplexes in maintaining cellular energy and supporting healthy aging.

Researchers are taking a closer look at tiny structures inside cells called mitochondrial supercomplexes, which may play an important role in how cells produce energy and how the body ages.

Mitochondria are often described as the “powerhouses” of cells because they produce adenosine triphosphate (ATP), the main chemical energy source that powers many cellular activities. As people and animals age, however, mitochondrial function can decline, contributing to one of the major biological hallmarks of aging: mitochondrial dysfunction.

How mitochondria produce energy

Mitochondria generate ATP through a process known as oxidative phosphorylation (OXPHOS). This process involves five major protein complexes, known as Complexes I through V.

Complexes I through IV make up the electron transport chain. They transfer electrons through a series of reactions and create a proton gradient across the inner mitochondrial membrane. Complex V then uses this gradient to produce ATP.

Studies have found that the amount and activity of several of these mitochondrial complexes can decrease with age. For example, Complex I tends to show reduced levels and activity, while Complexes III and IV may also decline.

Evidence from animal studies further suggests that problems with the OXPHOS system can have significant effects on health and lifespan. Animals with defects in these energy-producing systems often have shorter lifespans than healthy animals.

The importance of mitochondrial supercomplexes

Mitochondrial complexes do not always work independently. Instead, they can come together to form larger structures known as supercomplexes.

These supercomplexes appear to help mitochondria produce energy more efficiently while limiting the production of reactive oxygen species (ROS). Excessive ROS can damage cells and contribute to aging and disease.

Researchers have found evidence that the formation and stability of mitochondrial supercomplexes may decline with age. This raises the possibility that changes in these structures could contribute to the gradual loss of mitochondrial function associated with aging.

Two factors have emerged as important regulators of supercomplex formation: COX7RP, also known as SCAF1, a protein involved in organizing mitochondrial complexes, and cardiolipin, a specialized lipid found in the mitochondrial membrane.

A possible link to healthy aging

Recent research has strengthened interest in the connection between mitochondrial supercomplexes and longevity. In animal studies, increasing the formation of these structures has been shown to slow some aspects of aging in mice.

While these findings are still part of an emerging area of research, they suggest that improving the way mitochondrial complexes work together could potentially help maintain cellular energy production and reduce harmful oxidative stress.

A recent review examines what scientists currently know about the formation, function, and stability of mitochondrial supercomplexes, as well as their possible role in aging and longevity.

Researchers are increasingly interested in whether targeting these structures could become a future strategy for promoting healthier aging and longer healthspan. However, more research is needed to determine whether findings from laboratory and animal studies can eventually be translated into effective approaches for humans.