{"database":"GEO","file_versions":[{"headers":{"Content-Type":["application/json"]},"body":{"files":{"Other":["ftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE333nnn/GSE333893/"]},"type":"primary"},"statusCode":"OK","statusCodeValue":200}],"scores":null,"additional":{"omics_type":["Transcriptomics"],"species":["Mus musculus"],"gds_type":["Expression profiling by high throughput sequencing"],"full_dataset_link":["https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE333893"],"repository":["GEO"],"entry_type":["GSE"],"additional_accession":[]},"is_claimable":false,"name":"Gut microbiota primes stroke severity via the AHR in intestinal dendritic cells","description":"The gut microbiota modulates systemic immunity and neurological diseases, yet the underlying mechanisms remain unclear. Here, we identify the enrichment of indole-producing Escherichia coli being associated with worse outcomes in mice and patients with ischemic stroke. Microbial indole triggers an aryl hydrocarbon receptor (AHR)-dependent response in dendritic cells (DCs). DC-specific AHR deletion improves stroke outcomes and preserves intestinal conventional type 1 DCs. AHR deletion also promotes immunoregulatory and migratory transcriptional signatures and enhances CCR7-dependent migration in vitro. Pharmacological AHR inhibition favors gut-derived DC accumulation in the meninges, accompanied by increased regulatory T cells (Tregs) and reduced neuroinflammation, while Treg depletion abolishes the neuroprotection conferred by AHR inhibition. Detrimental effects of indole-producing Escherichia coli, indole administration, and microbiota transplantation from patients with stroke are attenuated in DC-specific AHR-deficient mice. These findings define a microbiota-AHR axis that programs intestinal immune responses before brain injury and highlight microbial tryptophan metabolism as a tractable therapeutic target.","dates":{"publication":"2026/09/29"},"accession":"GSE333893","cross_references":{"GSM":["GSM9776632","GSM9776631","GSM9776630","GSM9776629","GSM9776628","GSM9776633"],"GPL":["30172"],"GSE":["333893"],"taxon":["Mus musculus"]}}