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Contracting <jats:italic>T.\u00a0gondii<\/jats:italic> at the primary infection of the mother can result in neonatal microcephaly, chorioretinitis, hydrocephalus, or mortality. Our previous study indicated that pregnant mice infected with <jats:italic>T.\u00a0gondii<\/jats:italic> displayed a decrease in both the number and the suppressive ability of regulatory T cells, accompanied by the reduced Forkhead box P3 (Foxp3). Numerous studies have proved that microRNAs (miRNAs) are implicated in <jats:italic>T.\u00a0gondii<\/jats:italic> infection, but there is meager evidence on the relationship between alterations of miRNAs and downregulation of Foxp3 induced by <jats:italic>T.\u00a0gondii<\/jats:italic>.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Quantitative reverse transcription polymerase chain reaction was utilized to detect the transcriptions of miRNAs and Foxp3. Protein blotting and immunofluorescence were used to detect the expressions of Foxp3 and related transcription factors. The structure of mouse placenta was observed by hematoxylin and eosin (HE) staining.<\/jats:p>\n                <jats:p>To examine the activity of miR-7b promoter and whether miR-7b-5p targets Sp1 to suppress Foxp3 expression, we constructed recombinant plasmids containing the full-length\/truncated\/mutant miR-7b promoter sequence or wildtype\/mutant of Sp1 3' untranslated region (3' UTR) to detect the fluorescence activity in EL4 cells.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>In <jats:italic>T.\u00a0gondii<\/jats:italic>-infected mice, miR-7b transcription was significantly elevated, while Foxp3 expression was decreased in the placenta. In\u00a0vitro, miR-7b mimics downregulated Foxp3 expression, whereas its inhibitors significantly upregulated Foxp3 expression. miR-7b promoter activity was elevated upon the stimulation of <jats:italic>T.\u00a0gondii<\/jats:italic> antigens, which was mitigated by co-transfection of mutant miR-7b promoter lacking peroxisome proliferator-activated receptor \u03b3 (PPAR\u03b3) target sites. Additionally, miR-7b mimics diminished Sp1 expression, while miR-7b inhibitors elevated its expression. miR-7b mimics deceased the fluorescence activity of Sp1 3' untranslated region (3' UTR), but it failed to impact the fluorescence activity upon the co-transfection of mutant Sp1 3' UTR lacking miR-7b target site.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p><jats:italic>T.\u00a0gondii<\/jats:italic> infection and antigens promote miR-7b transcription but inhibit Foxp3 protein and gene levels. <jats:italic>T.\u00a0gondii<\/jats:italic> antigens promote miR-7b promoter activity by a PPAR\u03b3-dependent mechanism. miR-7b directly binds to Sp1 3' UTR to repress Sp1 expression. Understanding the regulatory functions by which <jats:italic>T.\u00a0gondii<\/jats:italic>-induced miR-7b suppresses Foxp3 expression can provide new perspectives for the possible therapeutic avenue of <jats:italic>T.\u00a0gondii<\/jats:italic>-induced adverse pregnancy outcomes.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Graphical Abstract<\/jats:title>\n                \n              <\/jats:sec>","DOI":"10.1186\/s13071-024-06262-0","type":"journal-article","created":{"date-parts":[[2024,4,17]],"date-time":"2024-04-17T14:06:16Z","timestamp":1713362776000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Inhibition of Foxp3 expression in the placenta of mice infected intraperitoneally by toxoplasma gondii tachyzoites: insights into the PPAR\u03b3\/miR-7b-5p\/Sp1 signaling pathway"],"prefix":"10.1186","volume":"17","author":[{"given":"Yue","family":"Zhong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng","family":"Qin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maoyuan","family":"Ding","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chong","family":"Qiu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunzhao","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinling","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,4,17]]},"reference":[{"key":"6262_CR1","doi-asserted-by":"publisher","DOI":"10.3389\/fimmu.2022.866937","volume":"13","author":"P Muralidhara","year":"2022","unstructured":"Muralidhara P, Sood V, Vinayak Ashok V, Bansal K. 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