scholarly journals C/EBPβ Mediates Synergistic Upregulation of Gene Expression by Interferon-γ and Tumor Necrosis Factor-α in Bone Marrow-Derived Mesenchymal Stem Cells

Stem Cells ◽  
2009 ◽  
Vol 27 (4) ◽  
pp. 942-948 ◽  
Author(s):  
Guangwu Xu ◽  
Yingyu Zhang ◽  
Liying Zhang ◽  
Arthur I. Roberts ◽  
Yufang Shi
Keyword(s):  
Gene Expression ◽  
Stem Cells ◽  
Bone Marrow ◽  
Mesenchymal Stem Cells ◽  
Tumor Necrosis Factor ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Interferon Γ ◽  
Factor Α ◽  
Necrosis Factor

The let-7f-5p–Nme4 pathway mediates tumor necrosis factor α-induced impairment in osteogenesis of bone marrow-derived mesenchymal stem cells

2021 ◽  
pp. 1-11
Author(s):  
Ying-Jie Zhao ◽  
Zheng-Chao Gao ◽  
Xi-Jing He ◽  
Jing Li
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Mesenchymal Stem Cells ◽  
Tumor Necrosis Factor ◽  
Osteogenic Differentiation ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Tnf Α ◽  
Factor Α ◽  
Necrosis Factor

Although tumor necrosis factor α (TNF-α)-mediated inflammation significantly impacts osteoporosis, the mechanisms underlying the osteogenic differentiation defects of bone marrow-derived mesenchymal stem cells (BM-MSCs) caused by TNF-α remain poorly understood. We found that TNF-α stimulation of murine BM-MSCs significantly upregulated the expression levels of several microRNAs (miRNAs), including let-7f-5p, but this increase was significantly reversed by treatment with the kinase inhibitor BAY 11-7082. To study gain- or loss of function, we transfected cells with an miRNA inhibitor or miRNA mimic. We then demonstrated that let-7f-5p impaired osteogenic differentiation of BM-MSCs in the absence and presence of TNF-α, as evidenced by alkaline phosphatase and alizarin red staining as well as quantitative assays of the mRNA levels of bone formation marker genes in differentiated BM-MSCs. Moreover, let-7f-5p targets the 3′ untranslated region of Nucleoside diphosphate kinase 4 (Nme4) mRNA and negatively regulates Nme4 expression in mouse BM-MSCs. Ectopic expression of Nme4 completely reversed the inhibitory effects of the let-7f-5p mimic on osteogenic differentiation of mouse BM-MSCs. Furthermore, inhibition of let-7f-5p or overexpression of Nme4 in BM-MSCs restored in-vivo bone formation in an ovariectomized animal model. Collectively, our work indicates that let-7f-5p is involved in TNF-α-mediated reduction of BM-MSC osteogenesis via targeting Nme4.

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