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• W2089896714 abstract "CCAAT/enhancer-binding protein β (C/EBPβ) is a transcription factor that promotes hypertrophic differentiation by stimulating type X collagen and matrix metalloproteinase 13 during chondrocyte differentiation. However, the effect of C/EBPβ on proliferative chondrocytes is unclear. Here, we investigated whether C/EBPβ represses type II collagen (COL2A1) expression and is involved in the regulation of sex-determining region Y-type high mobility group box 9 (SOX9), a crucial factor for transactivation of Col2a1. Endogenous expression of C/EBPβ in the embryonic growth plate and differentiated ATDC5 cells were opposite to those of COL2A1 and SOX9. Overexpression of C/EBPβ by adenovirus vector in ATDC5 cells caused marked repression of Col2a1. The expression of Sox9 mRNA and nuclear protein was also repressed, resulting in decreased binding of SOX9 to the Col2a1 enhancer as shown by a ChIP assay. Knockdown of C/EBPβ by lentivirus expressing shRNA caused significant stimulation of these genes in ATDC5 cells. Reporter assays demonstrated that C/EBPβ repressed transcriptional activity of Col2a1. Deletion and mutation analysis showed that the C/EBPβ core responsive element was located between +2144 and +2152 bp within the Col2a1 enhancer. EMSA and ChIP assays also revealed that C/EBPβ directly bound to this region. Ex vivo organ cultures of mouse limbs transfected with C/EBPβ showed that the expression of COL2A1 and SOX9 was reduced upon ectopic C/EBPβ expression. Together, these results indicated that C/EBPβ represses the transcriptional activity of Col2a1 both directly and indirectly through modulation of Sox9 expression. This consequently promotes the phenotypic conversion from proliferative to hypertrophic chondrocytes during chondrocyte differentiation. CCAAT/enhancer-binding protein β (C/EBPβ) is a transcription factor that promotes hypertrophic differentiation by stimulating type X collagen and matrix metalloproteinase 13 during chondrocyte differentiation. However, the effect of C/EBPβ on proliferative chondrocytes is unclear. Here, we investigated whether C/EBPβ represses type II collagen (COL2A1) expression and is involved in the regulation of sex-determining region Y-type high mobility group box 9 (SOX9), a crucial factor for transactivation of Col2a1. Endogenous expression of C/EBPβ in the embryonic growth plate and differentiated ATDC5 cells were opposite to those of COL2A1 and SOX9. Overexpression of C/EBPβ by adenovirus vector in ATDC5 cells caused marked repression of Col2a1. The expression of Sox9 mRNA and nuclear protein was also repressed, resulting in decreased binding of SOX9 to the Col2a1 enhancer as shown by a ChIP assay. Knockdown of C/EBPβ by lentivirus expressing shRNA caused significant stimulation of these genes in ATDC5 cells. Reporter assays demonstrated that C/EBPβ repressed transcriptional activity of Col2a1. Deletion and mutation analysis showed that the C/EBPβ core responsive element was located between +2144 and +2152 bp within the Col2a1 enhancer. EMSA and ChIP assays also revealed that C/EBPβ directly bound to this region. Ex vivo organ cultures of mouse limbs transfected with C/EBPβ showed that the expression of COL2A1 and SOX9 was reduced upon ectopic C/EBPβ expression. Together, these results indicated that C/EBPβ represses the transcriptional activity of Col2a1 both directly and indirectly through modulation of Sox9 expression. This consequently promotes the phenotypic conversion from proliferative to hypertrophic chondrocytes during chondrocyte differentiation." @default.
• W2089896714 created "2016-06-24" @default.
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• W2089896714 date "2014-01-01" @default.
• W2089896714 modified "2023-09-27" @default.
• W2089896714 title "CCAAT/Enhancer-binding Protein β Regulates the Repression of Type II Collagen Expression during the Differentiation from Proliferative to Hypertrophic Chondrocytes" @default.
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• W2089896714 doi "https://doi.org/10.1074/jbc.m113.492843" @default.
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• W2089896714 hasPublicationYear "2014" @default.
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