Depression: How Helpful Brain Cells May Backfire
- Major depressive disorder (MDD), a leading cause of disability, affects more than 280 million people globally.The condition significantly impacts mood and diminishes interest in previously enjoyable activities.
- Gaurav Singhal at the University of Wisconsin examined the role of astrocytes, a specialized type of glial cell, in neuroinflammation and MDD.
- the researchers found that astrocytes are essential for maintaining the structural integrity of synaptic junctions.
Discover how helpful brain cells are connected to major depression. Recent research unveils the double-edged sword of astrocytes, key players in brain inflammation, possibly worsening the symptoms of major depressive disorder. These cells, normally supporting synaptic health, can shift their role, amplifying inflammation through a complex interplay with microglia, releasing inflammatory cytokines.News Directory 3 reports on Dr. Gaurav Singhal’s work,which reviewed 226 papers,shedding light on the molecular mechanisms behind astrocyte dysfunction. Understanding this pivotal role of astrocytes offers exciting prospects for targeted therapies. Further studies promise tailored interventions for depression and other psychiatric conditions. Discover what’s next …
Astrocytes’ Role in Brain Inflammation Linked to Major Depression
Updated June 24, 2025
Major depressive disorder (MDD), a leading cause of disability, affects more than 280 million people globally.The condition significantly impacts mood and diminishes interest in previously enjoyable activities. Beyond cognitive issues,MDD also affects social and occupational functioning. Research suggests that immune factors,especially brain glial cells,play a key role in driving neuroinflammation,contributing to MDD’s development.
A team led by Dr. Gaurav Singhal at the University of Wisconsin examined the role of astrocytes, a specialized type of glial cell, in neuroinflammation and MDD. Their review, slated for publication in Neuroprotection, analyzed 226 research papers to understand how these cells contribute to the disorder.
the researchers found that astrocytes are essential for maintaining the structural integrity of synaptic junctions. They release neurotrophic factors,such as brain-derived neurotrophic factor and fibroblast growth factor-2,which promote neurite growth and synapse formation. Astrocytes also facilitate dialog between neurons by regulating the ionic habitat. Changes in astrocyte function correlate with poor synaptic connectivity, exacerbating depressive symptoms.
The study revealed a mechanism where activated microglia release pro-inflammatory cytokines, including tumor necrosis factor-α and interleukin-1. These signals prompt astrocytes to secrete additional inflammatory chemicals, amplifying neuroinflammation in MDD.
Dr. Singhal explained the role of molecular crosstalk: “increased intracellular calcium levels within astrocytes can induce the release of adenosine triphosphate (ATP), which, in turn, triggers a delayed calcium response in microglial cells. Following multiple cycles of astrocyte-released ATP-based activation, microglial cells eventually undergo apoptosis or programed cell death.”
Animal studies further showed that astrocytic lactate dehydrogenase A, crucial for lactate production, maintains neuronal excitability.Histone lactylation, where lactate molecules modify DNA, alters gene expression, contributing to astrocyte-driven neuroinflammation. This highlights how astrocytes can shift from a neuroprotective role to promoting inflammation by increasing the expression and secretion of inflammatory cytokines in major depression.
What’s next
Further research into the specific molecular mechanisms of astrocyte dysfunction could pave the way for targeted therapies to treat depression and other psychiatric disorders by modulating neuroinflammation.