A groundbreaking study reveals novel mitochondrial mechanisms linked to anti-aging and longevity, shedding light on the potential for extending healthy lifespan. As global life expectancy rises, the focus has shifted from mere longevity to maintaining good health throughout life. This shift emphasizes the importance of extending 'healthspan,' the period of vitality, independence, and good health, free from age-related issues. Mitochondria, the cell's energy producers, play a pivotal role in this context by generating adenosine triphosphate (ATP), the energy currency of life. Given the strong correlation between declining mitochondrial function and age-related diseases and aging, mitochondria have become a primary research target for extending healthy longevity.
Mitochondrial energy production relies on respiratory chain complexes, which facilitate proton and electron transfers necessary for ATP generation. These complexes can form higher-order assemblies called supercomplexes, believed to enhance respiratory efficiency. However, the causal link between supercomplexes and direct health benefits is not well-established, particularly in animal models.
To bridge this knowledge gap, a research team led by Satoshi Inoue from the Tokyo Metropolitan Institute for Geriatrics and Gerontology in Japan, investigated the role of COX7RP, a mitochondrial protein involved in supercomplex formation. Their study, co-authored by Kazuhiro Ikeda from Saitama Medical University in Japan, was published in the journal Aging Cell on November 18, 2025.
Dr. Inoue explains, 'We previously identified COX7RP as a key factor promoting mitochondrial respiratory supercomplex formation, enhancing energy production and reducing reactive oxygen species (ROS) causing oxidative stress. Based on this, we explored COX7RP and supercomplexes' role in aging and anti-aging processes.'
The team developed COX7RP-transgenic (COX7RP-Tg) mice models, genetically engineered to express higher COX7RP levels throughout their lives. This allowed detailed testing of the protein's impact on longevity, aging, and metabolism.
Surprisingly, COX7RP-Tg mice exhibited a 6.6% extended lifespan compared to wild-type mice. Beyond longevity, these transgenic mice showed improved health, suggesting extended healthspan. Key benefits included enhanced glucose homeostasis through improved insulin sensitivity, healthier lipid profiles with reduced triglycerides and total cholesterol, better muscle endurance, and reduced liver fat accumulation.
At the cellular level, researchers confirmed COX7RP's positive impact on mitochondrial performance. COX7RP-Tg mice tissues showed increased supercomplex formation, leading to higher ATP production. Detailed analysis of white adipose tissue revealed improved aging biomarkers, such as higher coenzyme NAD+ and lower ROS levels, and reduced cellular aging marker β-galactosidase. Single-nucleus RNA sequencing further showed lower expression of genes linked to age-related inflammatory responses, particularly senescence-associated secretory phenotype (SASP) genes.
These findings suggest that enhancing mitochondrial energy efficiency can delay and mitigate aging problems. Dr. Inoue emphasizes, 'Our study elucidated novel mitochondrial mechanisms underlying anti-aging and longevity, offering insights into promoting healthspan and extending lifespan. For instance, supplements and medications enhancing supercomplex assembly and function may contribute to longevity expansion.'
Future studies could establish mitochondrial supercomplexes as therapeutic targets, paving the way for interventions to maintain vitality and address age-related metabolic diseases like diabetes, dyslipidemia, and obesity.
