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Although their roles in placental biology are increasingly recognized, the mechanisms that regulate HBC identity and function are not yet fully defined. This study aimed to define the core transcriptomic and epigenomic features of HBCs in term placentas and to examine their capacity for transcriptional responsiveness and phenotypic variation. Using chromatin accessibility profiling and bulk RNA-seq, we found that HBCs exhibit a unique gene expression and chromatin accessibility profile compared with other fetal and adult macrophages. We identified a coordinated transcriptional network involving nuclear receptors (NRs) NR4A1\u20133, the glucocorticoid receptor, and RFX family members (RFX1, RFX2, RFX5) that appears to shape HBC identity, particularly through pathways linked to lipid metabolism and angiogenesis. Although exploratory in nature, in vitro stimulation studies showed that HBCs exhibited increased transcriptional activity in response to combined IL-4 and rosiglitazone treatment, including induction of the lipid transporter CD36. Mass cytometry analysis revealed surface markers indicative of both immature and mature macrophage states. These results together indicate that HBCs are a distinct and diverse population of macrophages with a specialized, adaptable regulatory program in the human placenta.<\/jats:p>","DOI":"10.1172\/jci.insight.195801","type":"journal-article","created":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T17:00:58Z","timestamp":1766509258000},"source":"Crossref","is-referenced-by-count":3,"title":["Distinct transcriptional and epigenomic programs define Hofbauer cells in term placenta"],"prefix":"10.1172","volume":"11","author":[{"given":"Benj\u00e1min R.","family":"Bar\u00e1th","sequence":"first","affiliation":[{"name":"Department of Biochemistry and Molecular Biology, Faculty of Medicine, and"},{"name":"Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, Debrecen, Hungary."},{"name":"Institute for Fundamental Biomedical Research, Johns Hopkins All Children\u2019s Hospital, St. Petersburg, Florida, 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