Neuroinflammatory and Synaptic Roles of Glial Cells in Autism Spectrum Disorder

Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by impaired social communication and repetitive behavior. Early indicators are that glial cells-astrocytes, microglia, and oligodendrocytes-are at the center of the etiology and pathogenesis of ASD. A systematic review of literature studies examining glial cell pathology in ASD was conducted. Peer-reviewed literature on astrocyte function, microglial phenotypes, oligodendrocyte-mediated connectivity, and molecular pathways of neurotransmission and neuroinflammation was searched in databases. Astrocytes, playing a crucial role in synaptogenesis and neurotransmitter modulation, exhibit disrupted calcium signaling and increased IL-6 expression in ASD, potentially leading to neuroinflammation and synaptic injury. Microglia, maintaining synaptic homeostasis, become pro-inflammatory (M1) in ASD, which produces cytokines that destroy neurons. Disrupted oligodendrocyte function is linked to aberrant myelination and disrupted neural connectivity. Molecular mechanisms underlie dysregulated activation of toll-like receptors, cytokine signaling, oxidative stress, and dysregulation of glutamate/GABA metabolism. Environmental toxins like chlorpyrifos aggravate excitatory signaling and glial dysfunction. Most of the features of ASD are caused by these glial disorders. Interventions to correct glial dysfunction-e.g., anti-inflammatory medication (e.g., minocycline, ibudilast), gene therapy, and stem cell therapy-are investigated for their potential to restore glia to normal and diminish ASD symptoms. Understanding glial-neuronal communication mechanisms and their role in neuroinflammation offers a hopeful future for accurate, target-specific treatment. Advances in the elucidation of these processes will foretell an enormous increase in therapeutic efficacy and quality of life for individuals with ASD.