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These outcomes are associated with altered placental vascularisation, but the underlying mechanisms remain poorly defined. Hofbauer cells (HBCs) are fetal\u2010origin macrophages located in the villous stroma with established roles in immune regulation and vascularisation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Method of Study<\/jats:title>\n                    <jats:p>This study investigated whether HBC abundance and phenotype are associated with fetal growth, fetal sex, and placental vascularisation in term placentae from non\u2010GDM and GDM pregnancies. Pan\u2010macrophage (CD14, CD68), HBC\u2010enriched (FOLR2, VSIG4), M1 (CD86), and M2 (CD163, MRC1) markers were assessed by RT\u2010qPCR and quantitative immunohistochemistry.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In both non\u2010GDM and GDM placentae, all markers, except CD86 were detected, supporting an M2\u2010like HBC phenotype. In GDM placentae, the number of pan\u2010macrophage (CD68), HBC\u2010enriched (FOLR2), and M2\u2010associated (CD163, MRC1) cells were reduced in terminal villi compared with non\u2010GDM controls (\n                      <jats:italic>p<\/jats:italic>\n                      &lt; 0.05;\n                      <jats:italic>n<\/jats:italic>\n                      = 13 non\u2010GDM;\n                      <jats:italic>n<\/jats:italic>\n                      = 12 GDM), indicating reduced HBC abundance without phenotypic switching. Reduced expression of HBC\u2010enriched (FOLR2, VSIG4) and M2\u2010associated (CD163) transcripts supported these findings (\n                      <jats:italic>p<\/jats:italic>\n                      &lt; 0.05;\n                      <jats:italic>n<\/jats:italic>\n                      = 18 non\u2010GDM;\n                      <jats:italic>n<\/jats:italic>\n                      = 19 GDM). No further differences were observed following stratification by fetal growth or sex. HBC\u2010related gene expression correlated positively with the endothelial marker PECAM1\/CD31, in both non\u2010GDM and GDM placentae (\n                      <jats:italic>r<\/jats:italic>\n                      \u2265 0.5,\n                      <jats:italic>p<\/jats:italic>\n                      &lt; 0.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>HBCs abundance is reduced in GDM placentae independently of fetal growth or sex, whilst HBC phenotype is preserved. Reduced HBC abundance may contribute to placental vascular alterations that are characteristic of GDM.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/aji.70216","type":"journal-article","created":{"date-parts":[[2026,2,15]],"date-time":"2026-02-15T17:19:00Z","timestamp":1771175940000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Hofbauer Cells in Pregnancies Complicated by Gestational Diabetes Mellitus and Pathological Fetal Growth"],"prefix":"10.1111","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3492-1882","authenticated-orcid":false,"given":"Georgia","family":"Fakonti","sequence":"first","affiliation":[{"name":"Leeds Institute of Cardiovascular and Metabolic Medicine University of Leeds  Leeds 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