CR6-interacting factor-1 contributes to osteoclastogenesis by inducing receptor activator of nuclear factor κB ligand after radiation

Figure 4 CR6-interacting factor-1 mediates adipogenesis and receptor activator of nuclear factor κB ligand secretion in adipocytes. A: Oil red O staining analysis of mouse bone marrow mesenchymal stem/stromal cells (BM-MSCs) after 21 d of adipogenic differentiation. Crif1 was knocked out in mouse BM-MSCs (BM-MSCs-KO), and knockout cells and controls were irradiated with 9 Gy of Co-60, and then treated with mouse mesenchymal stem cell adipogenic differentiation medium (Ad) to induce adipogenesis; B: The dye from oil red O staining was extracted using isopropanol, and the optical density at 510 nm was measured using Benchmark Plus; C: Western blot analysis of adipogenesis-related markers and transcription factors PPARγ and AP2 in mouse BM-MSCs after 21 d of adipogenic differentiation; D: Real-time quantitative polymerase chain reaction analysis of receptor activator of nuclear factor κB ligand (RANKL) and osteoprotegerin (OPG) mRNA expression in BM-MSCs and BM-MSCs-KO; E: RANKL/OPG ratio based on real-time quantitative polymerase chain reaction results; F: Enzyme linked immunosorbent assay analysis of RANKL protein levels in supernatant Ad; G: Enzyme linked immunosorbent assay analysis of OPG protein levels in supernatant Ad; H: RANKL/OPG ratio in supernatant Ad. ^aP < 0.05 vs control (BM-MSCs), ^bP < 0.01 vs control (BM-MSCs); ^dP < 0.01 between 9 Gy-BM-MSCs and 9 Gy-BM-MSCs-KO, and the bars represent the mean ± SD. BM-MSCs: Bone marrow mesenchymal stem/stromal cells; BM-MSCs-KO: Crif1 knockout mouse BM-MSCs; OPG: Osteoprotegerin; RANKL: Receptor activator of nuclear factor κB ligand.