PPAR-γ - Peroxisome proliferator-ac4vated receptor gamma

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3 PPAR-γ - Peroxisome proliferator-ac4vated receptor gamma

4 PPAR-γ - Peroxisome proliferator-ac4vated receptor gamma

5 C/EBPalpha - CCAAT/enhancer-binding protein alpha C/EBPα contains: - a func)onally related leucine zipper dimeriza)on domain (LZ) at its C-terminus and an adjacent highly conserved basic region (BR) that mediates sequence-specific DNA binding. - a transac)va)on domains (TADs) and a regulatory domain (RD) located in their N-terminal regions.

6 Cell differentiation

7 WNT pathway

8 Chroma4n structure and gene expression

9

10

11 Murine Adherent Fibroblast

12 in vitro osteogenesis model by exposing C3H10T1/2 cells to bone morphogene4c protein 2 (BMP2)

13 PPAR-γ mrna expression profile during C3H10T1/2 osteogenesis by real-4me PCR and western bloong

14 Adenovirus vector expressing sirna against PPAR-γ to down-regulate PPARc expression also used G3335, a specific antagonist of PPAR-γ, to block its ac4vity PPAR-γ contributed to C/EBPa expression during C3H10T1/2 osteogenesis at least in part

15 up-regula4on of PPAR-γ and C/EBPa expression These data suggest that PPAR-γ ac4vates C/EBPa expression in C3H10T1/2 cells

16 CLONING - TRANSFECTION - LUCIFERASE ASSAY Figura 21: Mappa circolare del veuore pgl3-basic. La regione del promotore -1785/-20 del 5 del gene SLC25A1 è stato inserito, mediante diges<one con le endonucleasi di restrizione BglII e HindIII, nella regione a monte del gene reporter per la luciferasi.

17 CLONING - TRANSFECTION - LUCIFERASE ASSAY

18 CLONING - TRANSFECTION - LUCIFERASE ASSAY

19 Binding of PPAR-γ to the 1286 bp/1065 bp promoter region to ac4vate C/EBPa expression a transient reporter assay was performed in C3H10T1/2 cells treated with BMP2, rosiglitazone and/or G3335 for 72 h

20 ChIP experiments

21 Binding of PPAR-γ to the 1286 bp/1065 bp promoter region to ac4vate C/EBPa expression ChIP experiments performed in C3H10T1/2 cells treated with BMP2, using PPARg an4body These data confirm binding of PPAR-γ to the 1286 bp/1065 bp region of the C/EBPa promoter.

22 Plasmid In vitro methyla4on: SAM treatment

23 DNA methyla4on and PPAR-γ -associated repression of HDAC1 in the 1286 bp/ 1065 bp region of the C/EBPa promoter In a previous report [2], DNA hypermethyla)on in the 1286 bp/1065 bp region of the C/ EBPa promoter was observed at the terminal stage (21 days) of osteogenesis of C3H10T1/2 cells The results showed that DNA methyla4on counters PPAR-γ binding to the 1286 bp/1065 bp region

24 DNA methyla4on and PPAR-γ -associated repression of HDAC1 in the 1286 bp/ 1065 bp region of the C/EBPa promoter In addi)on to DNA hypermethyla)on, hypoacetyla)on of histones 3 and 4 in the 1286 bp/1065 bp region of the C/EBPa promoter was also observed at the terminal stage of osteogenesis [2]. The acetyla4on level of histones 3 and 4 was reduced and HDAC1 binding was significantly enhanced in the 1286 bp/1065 bp region at the terminal stage of osteogenesis compared with the early stage

25 Ac4va4on of C/EBPa expression by PPAR-γ during adipogenesis of C3H10T1/2 cells C3H10T1/2 cells were induced to undergo adipogenesis by insulin, fetal bovine serum, methylisobutylxant hine and dexamethasone (IFMD protocol)

26 Luciferase reporter vector in which expression of luciferase was driven by the 1286 bp/1065 bp region of the C/EBPa promoter. A^er in vitro methyla)on, the vectors were transfected into C3H10T1/2 cells, and ChIP was performed in IFMD and control cultures

27 PPAR-γ and HDAC1 binding and the DNA methyla4on and histone acetyla4on status in the 1286 bp/1065 bp region of the C/EBPa promoter during in vitro osteogenesis of mouse BMSC (Bone marrow from BALB/c mice)

28 PPAR-γ and HDAC1 binding and the DNA methyla4on and histone acetyla4on status in the 1286 bp/1065 bp region of the C/EBPa promoter during in vitro osteogenesis of mouse BMSC (Bone marrow from BALB/c mice)

29 Balance between osteogenesis and adipogenesis of BMSC by modula4on of DNA methyla4on and histone acetyla4on The adipogenesis poten4al, which decreased at the terminal stage of osteogenesis, was recovered by 5ʹ-aza and TSA treatment

30 Model for C/EBPa expression regulated by PPAR-γ at the early and terminal stages of osteogenesis

31 The results of that study were interes4ng: DNA hypermethyla4on and hypoacetyla4on of histones 3 and 4 in the 1286 bp/1065 bp region of the C/EBPa promoter downregulated C/EBPa transcrip4on at the terminal stage of osteogenesis, and hypoacetyla4on of histones 3 and 4 depended on DNA hypermethyla4on through unknown molecular mechanisms. Ques4ons remain open regarding the balance between osteogenesis and adipogenesis regulated by C/EBPa that require elucida4on in more stringent, mechanis4c terms.

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