Mood disorders including depression, anxiety disorders, and bipolar disorder affect millions worldwide and remain among the leading causes of disability. Although current therapies primarily target neuronal signaling, growing evidence suggests that astrocytes, the most abundant glial cells in the brain, may play a far more active role in regulating mental health. Astrocytes help maintain synaptic stability, regulate neurotransmitters, support metabolic balance, and preserve blood-brain barrier integrity. When these functions become disrupted, astrocytes can shift toward neurotoxic states that intensify inflammation, neuronal dysfunction, and emotional disturbances.
A research team led by Prof. Jingji Wang, Prof. Guoqi Zhu from Anhui University of Chinese Medicine, and Prof. Shaojie Yang from The Second Affiliated Hospital of Anhui University of Chinese Medicine conducted a comprehensive review on the mechanisms underlying the transition and different subtypes of astrocytes. Their findings were published in the journal Brain Network Disorders.
The review highlights that astrocytes are no longer considered passive support cells but active regulators of neural circuitry and emotional processing. Under inflammatory conditions, activated microglia release signaling molecules including interleukin (IL)-1α, tumor necrosis factor (TNF)-α, and complement protein C1q, which drive astrocytes toward neurotoxic phenotypes associated with neuronal injury and synaptic loss. In contrast, anti-inflammatory mediators such as IL-10 and TGF-β can shift astrocytes toward neuroprotective states that promote tissue repair, neuronal survival, and synaptic recovery.
The investigators emphasized that astrocyte dysfunction may explain why many mood disorders involve overlapping symptoms, including cognitive impairment, emotional instability, chronic stress sensitivity, and neuroinflammation. Altered astrocyte activity can impair blood-brain barrier integrity, ATP release, increase inflammatory signaling, and disturb communication between neurons and glial cells.
“Understanding astrocyte subtype dynamics may fundamentally reshape how we approach mood disorders. Rather than focusing only on neurons, we now recognize that glial cells actively influence inflammation, metabolism, and synaptic function throughout disease progression,” said Prof. Wang.
“Astrocytes may become important therapeutic entry points for future psychiatric medicine. Future studies should aim to elucidate the cellular and molecular pathways governing astrocyte subtype plasticity and their functional impact on neuronal networks,” added Prof. Zhu.
Journal: Brain Network Disorders
DOI: 10.1016/j.bnd.2026.04.003
Article Title: Astrocyte subtype dynamics in mood disorders: Current insights and future directions
Publication Date: 22-May-2026