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Regulatory T cells (Tregs) exert immunosuppressive effects, which are essential to maintain fetal\u2013maternal immunological tolerance and regulate immune balance. In this study, we used the specific cell-surface phenotype of CD4<jats:sup>+<\/jats:sup>CD25<jats:sup>high<\/jats:sup>CD127<jats:sup>low\/\u2212<\/jats:sup> Tregs to investigate the number and suppressive function of Tregs isolated from the peripheral blood of patients with URSA with the aim of expanding our understanding of their role in URSA.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>We isolated a relatively pure population of peripheral CD4<jats:sup>+<\/jats:sup>CD25<jats:sup>high<\/jats:sup>CD127<jats:sup>low\/\u2212<\/jats:sup> Tregs and CD4<jats:sup>+<\/jats:sup>CD25<jats:sup>\u2212<\/jats:sup> responder T cells (Tresps) from the patients with URSA and normal fertile nonpregnant control women via fluorescence-activated cell sorting. We compared the frequency, suppressive capacity, and forkhead box transcription factor P3 (FOXP3) expression of Tregs in the peripheral blood between patients with URSA and normal controls.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>The frequency of CD4<jats:sup>+<\/jats:sup>CD25<jats:sup>high<\/jats:sup>CD127<jats:sup>low\/\u2212<\/jats:sup> Tregs in the peripheral blood was lower in URSA patients than in the controls (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05). The mean fluorescence intensity of FOXP3 and <jats:italic>FOXP3<\/jats:italic> mRNA expression in Tregs was also significantly lower in the URSA patients (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01). Tregs suppressed the activity of autologous Tresps stimulated with anti-CD3\/CD28 beads in a concentration-dependent manner, with the strongest suppression occurring in cocultures with a 1:1 Treg:Tresp ratio in both groups; however, patient-derived Tregs exhibited a poorer capacity to suppress the proliferation of autologous Tresps than the Tregs from normal controls (<jats:italic>P<\/jats:italic>\u00a0&lt;\u20090.01). Moreover, Tregs isolated from URSA patients inhibited the proliferation of Tresps from normal controls less potently than the Tregs from normal controls (<jats:italic>P<\/jats:italic>\u00a0&lt;\u20090.01), and Tresps from URSA patients were less effectively suppressed by autologous Tregs than by those from normal controls (<jats:italic>P<\/jats:italic>\u00a0&lt;\u20090.01). Tresp activity were intact in both groups.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>We observed a lower frequency of peripheral CD4<jats:sup>+<\/jats:sup>CD25<jats:sup>high<\/jats:sup>CD127<jats:sup>low\/\u2212<\/jats:sup> Tregs with lower FOXP3 expression in the peripheral blood of URSA patients. In addition, highly purified Tregs from patients with URSA exhibited impaired suppressive effects. The defect in immune regulation in URSA patients appears to be primarily related to impaired Tregs, and not to increased resistance of Tresps to suppression. Our findings reveal a potential novel therapeutic target for URSA.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12958-020-00619-7","type":"journal-article","created":{"date-parts":[[2020,6,10]],"date-time":"2020-06-10T08:02:44Z","timestamp":1591776164000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Reduced frequency and functional defects of CD4+CD25highCD127low\/\u2212 regulatory T cells in patients with unexplained recurrent spontaneous abortion"],"prefix":"10.1186","volume":"18","author":[{"given":"Li","family":"Luo","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6657-0124","authenticated-orcid":false,"given":"Xun","family":"Zeng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhongying","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shan","family":"Luo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lang","family":"Qin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shangwei","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,6,10]]},"reference":[{"key":"619_CR1","doi-asserted-by":"crossref","unstructured":"Medicine PCotSfR: Definitions of infertility and recurrent pregnancy loss. 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