Sex And Age Shape Mitochondrial Function In A Long-Lived Seabird
Our bodies, and those of all living creatures, rely on tiny powerhouses within our cells called mitochondria. These essential components generate over 90% of the energy our cells use, and their decline is often linked to the aging process. While many studies have explored mitochondrial function in humans and lab animals, less is known about how these vital structures change with age and sex in wild populations.
To shed light on this, researchers studied a long-lived seabird, the common tern, examining 161 breeding individuals ranging from 2 to 24 years old. They investigated how mitochondrial respiratory function—essentially, how well mitochondria produce energy—varied among these birds.
The findings revealed that as birds aged, their mitochondria showed a reduced maximum capacity for energy production. However, interestingly, the efficiency with which their mitochondria produced ATP (adenosine triphosphate), the main energy currency of cells, actually increased with age. This suggests that increased mitochondrial efficiency might be a sign of individual quality and could even be linked to survival in older birds.
While the general patterns of age-related changes were similar between males and females, a notable difference emerged: females consistently exhibited higher mitochondrial respiration. This could be attributed to the significant energy demands associated with egg-laying. The study also found that individual differences in mitochondrial efficiency and spare respiratory capacity were consistent over time, indicating stable individual traits.
Overall, this research provides valuable insights into the physiological mechanisms underlying aging and individual performance in wild animals, highlighting the complex interplay of age and sex in shaping mitochondrial function.
Source: link to paper