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 create emotional disturbances. Though existing literature suggest this transition of astrocytes, the mechanism behind their transition remains underexplored.
Addressing this challenge, a research team led by Prof. Jingji Wang, Prof. Guoqi Zhu from Anhui University of Chinese Medicine, and Prof. Shaojie Yang from The Second Affiliation Hospital of Anhui University of Chinese Medicine, China conducted a comprehensive review on the mechanisms underlying transition and different subtypes of astrocytes. The investigators reviewed emerging evidence on astrocyte subtype dynamics and their involvement in depression, anxiety disorders, and bipolar disorder. Their analysis explored inflammatory signaling, metabolic alterations, epigenetic regulation, ion channel dysfunction, and astrocyte–microglia interactions that collectively influence disease progression. Their findings published in the journal Brain Network Disorders on May, 22, 2026.
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, describing the subtypes of astrocytes. The researchers also describe how disrupted glutamate transport, abnormal calcium signaling, impaired potassium buffering, and excessive oxidative stress contribute to mood disorder pathology.
The investigators further 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. These changes may eventually disrupt synaptic plasticity and neural network stability in brain regions linked to emotional regulation, including the hippocampus, amygdala, and lateral habenula.
“ Understanding astrocyte subtype dynamics may fundamentally reshape how we approach mood disorders,” explains Prof. Wang. “ Rather than focusing only on neurons, we now recognize that glial cells actively influence inflammation, metabolism, and synaptic function throughout disease progression.”
The review also identifies several promising therapeutic directions. Experimental evidence suggests that targeting astrocytic glutamate transporters, inflammatory signaling pathways, calcium homeostasis, and epigenetic regulators could reduce neurotoxicity while restoring neuroprotective functions. Such strategies may eventually complement existing antidepressants and anxiety therapies.
According to Prof. Zhu, “ 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. This will accelerate the clinical translation process for the development of therapies. ”
Overall, the review demonstrates that astrocyte subtype dynamics are deeply integrated into the biological mechanisms underlying mood disorders. By clarifying how inflammatory signaling, metabolic imbalance, ion channels, and neuron–glia communication interact during disease progression, the study provides a broader framework for understanding psychiatric disorders beyond neuron-centered models. The researchers believe that advancing astrocyte-focused investigations may ultimately support the development of safer, more targeted, and biologically informed therapies for depression, anxiety, bipolar disorder, and related neuropsychiatric conditions.
Reference
Titles of original paper: Astrocyte subtype dynamics in mood disorders: Current insights and future directions
Journal: Brain Network Disorders
DOI: https://doi.org/10.1016/j.bnd.2026.04.003
Brain Network Disorders
Literature review
Not applicable
Astrocyte subtype dynamics in mood disorders: Current insights and future directions
22-May-2026
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.