GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE315nnn/GSE315063/primaryOK200GenomicsMus musculusGenome binding/occupancy profiling by high throughput sequencinghttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE315063GEOGSEfalseSmad4-p65 interactions drive BMP-mediated protection against inflammatory cell death [ATAC-Seq]Inflammation-induced osteoblast death undermines bone homeostasis and can aggravate bone-destructive diseases, yet how pro-survival BMP signaling intersects with inflammatory TNF–NF-κB signaling remains poorly defined. Here we show that BMP4 protects mouse osteoblasts from TNF-α–triggered apoptosis and cytotoxic death and that this cytoprotection requires both Smad4 and NF-κB p65. Integrative epigenomic profiling (ChIP-seq/ATAC-seq/RNA-seq) reveals extensive Smad4–p65 co-occupancy and identifies Samd9l as a prominent TNF-α–inducible gene that is selectively repressed by BMP4. Two Smad4/p65-bound distal elements physically contact the Samd9l promoter, exhibit TNF-responsive enhancer activity, and are required for Samd9l induction, as demonstrated by 4C-seq and CRISPR/dCas9-based chromatin closing/opening. Functionally, Samd9l depletion attenuates TNF-α–driven caspase activation and cytotoxicity in osteoblasts and enhances BMP2-driven ectopic bone formation in vivo. Cross-species mapping suggests that the two mouse regulatory elements converge into a single promoter-proximal composite element at the human SAMD9L locus, supporting a conserved inflammatory control node. Together, these findings define a BMP4–Smad4 mechanism that reshapes NF-κB enhancer outputs to limit osteoblast death and nominate the SAMD9L regulatory circuit as a therapeutic entry point for inflammatory bone loss.2026/02/18GSE315063GSM9420702GSM9420701GSM9420700GSM9420699GSM9420698GSM9420707GSM9420706GSM9420705GSM9420704GSM942070324247315063Mus musculus