Cellular Energy Shifts Linked to Depression-Related Fatigue, New Research Reveals

Researchers have identified potential biomarkers for major depression at its earliest stages, offering hope for improved diagnosis and treatment. A collaborative study between the University of Queensland (UQ) and the University of Minnesota has revealed unique patterns in cellular energy metabolism in young people experiencing major depressive disorder (MDD).

Uncovering the Energy Connection

The study, published in Translational Psychiatry, focused on adenosine triphosphate (ATP), often referred to as the “energy currency” of cells. Researchers analyzed ATP levels in both brain cells and blood samples from 18 individuals aged 18-25 diagnosed with MDD, comparing them to a control group without depression.

Associate Professor Susannah Tye from UQ’s Queensland Brain Institute (QBI) explained that this is the first time such patterns have been observed in both the brain and bloodstream of young people with MDD. “This suggests that depression symptoms may be rooted in fundamental changes in the way brain and blood cells use energy,” she said.

Unexpected Cellular Behavior

The research team discovered an unexpected phenomenon: cells from individuals with depression exhibited increased energy molecule production while at rest. Still, these same cells demonstrated a reduced capacity to ramp up energy production when faced with stress.

QBI researcher Dr. Roger Varela elaborated, “This suggests cells may be overworking early in the illness, which could lead to longer-term problems. It was surprising, because you might expect energy production in cells would be lower for people with depression. It suggests that in the early stages of depression, the mitochondria in the brain and body have a reduced capacity to cope with higher energy demand, which may contribute to low mood, reduced motivation, and slower cognitive function.”

Implications for Diagnosis and Treatment

Fatigue is a prevalent and often treatment-resistant symptom of MDD, and finding effective interventions has been challenging. Researchers hope these findings will pave the way for earlier intervention and more targeted treatments.

“There has been limited progress in developing new treatments because of a lack of research, and we hope this crucial breakthrough could potentially lead to early intervention and more targeted treatments,” Dr. Tye noted.

Dr. Varela added that the research could also help reduce the stigma surrounding depression and promote a more nuanced understanding of the condition. “This shows multiple changes occur in the body, including in the brain and the blood, and that depression impacts energy at a cellular level. It also proves not all depression is the same; every patient has different biology, and each patient is impacted differently.”

Study Details

The University of Minnesota team collected blood samples and brain scans from the participants. The QBI team then analyzed these samples. The brain imaging method used to measure ATP production was developed by Professors Xiao Hong Zhu and Wei Chen at the University of Minnesota. The study was led by Dr. Katie Cullen of the University of Minnesota.