MedCommOct 20, 2026

Astrocytes and Their Role in Brain Inflammation in Nervous System Diseases

Gut-Brain Axis Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Oct 21, 2026

Abstract

Astrocytes play a key role in neuroinflammation across multiple neurological disorders.

Reactive astrocytes exhibit changes in shape, gene expression, metabolism, and functions influenced by the disease context.
They exist on a continuum rather than a strict classification, adapting to the specific pathology and stage of the disorder.
Astrocytes contribute to neuroinflammation in conditions like Alzheimer's, Parkinson's, and multiple sclerosis through various mechanisms.
Key processes include the release of signaling molecules, disruption of ion balance, and regulation of the blood-brain barrier.
Astrocytes interact with other brain cells, such as microglia and neurons, which affects their role in neuroinflammatory responses.
Current and future therapies targeting astrocytes may involve metabolic adjustments and innovative delivery methods.

Simplified

Astrocytes have emerged as central regulators of neuroinflammation, extending far beyond their traditional roles as structural and metabolic support cells. In neurological disorders, astrocytes undergo reactive remodeling that encompasses morphological, transcriptional, metabolic, and functional changes. Rather than fitting into a fixed A1/A2 dichotomy, reactive astrocytes exist along a disease-, region-, and stage-dependent continuum shaped by local pathology and intercellular crosstalk. This review summarizes how astrocytes contribute to neuroinflammatory processes in Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, Huntington's disease, central nervous system injury, infection, multiple sclerosis, epilepsy, and autism spectrum disorder. We highlight convergent mechanisms, including cytokine and chemokine release, complement activation, glutamate and ion homeostasis disruption, oxidative stress, metabolic reprogramming, and blood-brain barrier regulation, while emphasizing disease-specific astrocytic programs. We further discuss astrocyte interactions with microglia, neurons, oligodendrocytes, endothelial cells, and peripheral immune cells, as well as key regulatory pathways, epigenetic remodeling, and lipid-dependent metabolic signaling. Finally, we evaluate current and emerging astrocyte-targeted therapeutic strategies, including metabolic modulation, receptor targeting, gene editing, nanodelivery, and gut-brain axis interventions. Defining functionally validated astrocyte states and developing biomarker-guided, stage-adaptive therapies may enable more precise intervention in neuroinflammatory and neurodegenerative diseases.

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Astrocytes and Their Role in Brain Inflammation in Nervous System Diseases

Abstract

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