ArticleFrontiers in immunology2026
Mucosal microbiota and intraepithelial lymphocyte remodeling link maternal immune activation to neuroimmune outcomes in female and male offspring.
Article in Frontiers in immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Maternal immune activation (MIA) is associated with increased risk for neurodevelopmental disorders, including schizophrenia and autism spectrum disorder, yet its long-term impact on intestinal immune-microbial programming remains incompletely understood. Here, we investigated whether lipopolysaccharide (LPS)-induced MIA drives persistent alterations in the offspring mucosal immune environment, with a focus on intraepithelial lymphocytes, mucosa-associated microbiota, systemic cytokines, and prefrontal cortical immune-related readouts. Methods: MIA was induced in wild-type BALB/cByJ mice via intraperitoneal LPS injection at gestational day 12.5. Male and female offspring were assessed at 10 weeks of age for gut, systemic, and prefrontal cortex (PFC) immune alterations. Results: MIA offspring displayed a regionally restricted intestinal immune signature, with more pronounced alterations in the ileum than in the colon. Ileal changes included increased inflammatory cytokine signaling and remodeling of IEL populations, particularly TCRγδ CD8αα cells, together with changes in TCRαβ IEL subsets. Analysis of the mucosa-associated microbiome revealed parallel changes in ileal microbial community structure, including alterations in segmented filamentous bacteria and Conclusions: Collectively, these findings identify the mucosa-associated microbiota-IEL interface as a previously underexplored component of MIA-induced immune remodeling. Our study provides an integrated framework in which persistent ileal immune and microbial alterations co-occur with systemic inflammation and cortical neuroimmune changes in MIA offspring, supporting future mechanistic studies of gut-brain immune communication in neurodevelopmental disorders.
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