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Title Page
Contents
ABSTRACT 9
I. INTRODUCTION 11
II. MATERIALS AND METHODS 13
1. Cell culture and alkaline phosphatase staining 13
2. Transfection of microRNAs 14
3. Cell proliferation and viability assays 14
4. Cell death assay and flow cytometry 15
5. Real time quantitative PCR for miRNA 15
6. RT-PCR 15
7. Western blot analysis 16
8. Plasmid constructs and transfection of plasmid 17
9. Luciferase constructs and reporter assay 17
10. Zebrafish experiments 18
11. Statistical analysis 19
III. RESULTS 20
1. miR-182 is expressed in bone and MC3T3E1 preosteoblasts and its expression increases with osteoblast differentiation 20
2. Effect of miR-182 on the proliferation of C3H10T1/2 mesenchymal stem cells, MC3T3E1 preosteoblasts and primary calvaria cells 22
3. Effect of miR-182 on the death of C3H10T1/2 mesenchymal stem cells, MC3T3E1 preosteoblasts and primary calvaria cells 24
4. Effect of miR-182 on the differentiation of C3H10T1/2 mesenchymal stem cells, MC3T3E1 preosteoblasts 26
5. FoxO1 is a target of miR-182 in C3H10T1/2 mesenchymal stem cells and MC3T3E1 preosteoblasts 28
6. In vivo effect of miR-182 in bone in a zebrafish model 31
IV. DISCUSSION 33
V. CONCLUSION 38
REFERENCES 39
ABSTRACT(IN KOREAN) 43
Figure 1. miR-182 expression in tissues and during osteoblast differentiation. (A) Alkaline phosphatase (ALP) staining of MC3T3E1 preosteoblasts after transfection of five candidate microRNAs (miRNAs) with two published miRNAs.... 21
Figure 2. miR-182 inhibits cell viability. (A-B) Level of proliferation and cell numbers after transfection of miR-182. *p<.05, **p<.01, ***p<.001 compared to miR-Control transfected cells.... 23
Figure 3. miR-182 promotes cell death. (A) LDH assay of C3H10T1/2 mesenchymal stem cells, MC3T3E1 preosteoblasts and primary calvaria cells transfected with miR-Control or miR-182.... 25
Figure 4. miR-182 inhibits osteoblast differentiation. (A) Alkaline phosphatase activity after transfection of cells with miR-182. C3H10T1/2 mesenchymal stem cells or MC3T3E1 preosteoblasts were transfected with miR-Control or miR-182 and... 27
Figure 5. miR-182 targets the FoxO1 3'UTR. (A) Schematic of the miR-182 putative target site in the mouse FoxO1 3' untranslated region (UTR) and alignment of miR-182 with the FoxO1 3'UTR showing complementary pairing.... 30
Figure 6. Effects of miR-182 on skeletogenesis in vivo zebrafish model. (A-D) Morphological phenotype of zebrafish embryos injected with dre-miR-Control (A) or dre-miR-182 (B-D).... 32
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