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However, the interplay among the gut microbiome, bile acid metabolism, and ICP-associated placental inflammation remains unexplored. We aimed to investigate the role of the gut microbiota in regulating bile acid metabolism and placental inflammation, and to identify potential probiotic-based therapies for ICP in C57BL\/6 mice. Immunohistochemical analysis of human placentas revealed significantly higher inflammation and decreased TGR5 expression in ICP compared with controls. In vivo and in vitro assays confirmed the anti-inflammatory effects of TGR5 activation. Using 16S rRNA sequencing and metabolomics, ICP mice exhibited a distinct gut microbiota composition and reduced abundance of bile salt hydrolase (BSH)-producing bacteria (e.g.,\n                    <jats:italic>Lactobacillus<\/jats:italic>\n                    ), accompanied by a significant decrease in the proportion of secondary bile acids. Transplanting fecal microbiota from ICP donors into healthy mice reproduced the disease phenotype of ICP, confirming the pathogenic role of gut microbiota dysbiosis. Supplementation with BSH-enriched\n                    <jats:italic>Lactobacillus paragasseri<\/jats:italic>\n                    LPG-9 remodeled the bile acid profile, thereby activating placental TGR5 to inhibit TLR4-NF-\u03baB signaling and promoting hepatic bile acid excretion via BSEP.\n                  <\/jats:p>","DOI":"10.1038\/s42003-026-09869-4","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T17:00:22Z","timestamp":1774544422000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Lactobacillus paragasseri LPG-9 reduces placental inflammation in intrahepatic cholestasis of pregnancy by regulating TGR5 in mice"],"prefix":"10.1038","volume":"9","author":[{"given":"Wanwen","family":"Huang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiechang","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiamin","family":"Shan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Shen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pingping","family":"Du","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaxin","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaotong","family":"Guo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenhui","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2098-7514","authenticated-orcid":false,"given":"Weisen","family":"Zeng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3494-8348","authenticated-orcid":false,"given":"Qiongxi","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0725-1596","authenticated-orcid":false,"given":"Hongying","family":"Fan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,26]]},"reference":[{"key":"9869_CR1","doi-asserted-by":"publisher","first-page":"717","DOI":"10.1111\/1471-0528.12174","volume":"120","author":"E Wikstrom Shemer","year":"2013","unstructured":"Wikstrom Shemer, E., Marschall, H. 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