Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0029463 (osteosarcoma)
 16,637 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A 97-kDa protein called valosin-containing protein (VCP) has been implicated in osteosarcoma metastasis and Paget's disease of bone, two conditions that complicate the course and outcome of orthopaedic surgery. High VCP gene expression is associated with high metastatic potential in osteosarcoma cells, while loss-of-function VCP mutations cause inclusion body myopathy associated with Paget's disease of bone and frontotemporal dementia (IBMPFD). VCP protein expression and regulation have not been examined in normal osteoblasts. The purpose of these studies was to characterize VCP protein expression in control and stressed untransformed osteoblasts. Proteins from confluent MC3T3-E1 mouse osteoblast-like cells were separated by 2D IEF/SDS-PAGE. An abundant spot with a M(r) of 94 kDa and a pI of 5.4 was identified as VCP by MALDI/ToF and peptide mass fingerprint analysis. High constitutive VCP protein expression in subconfluent and confluent resting and mildly physiologically stressed MC3T3-E1 cells was confirmed by Western blotting. When assessed by indirect immunofluorescence in fixed cells or Western blotting of subcellular fractions, VCP was more abundant in the cytoplasm than in the nucleus. Induction of mild physiological stress sufficient to stimulate the ubiquitin-proteasome pathway, which is partially dependent on VCP-mediated targeting of polyubiquitinylated substrates, did not affect steady-state VCP levels or distribution. Thus, VCP is a constitutively abundant protein in untransformed osteoblastic cells under all conditions tested. Such high levels of VCP protein expression in untransformed osteoblastic cells argue against a major causative role for it in metastasis, while the occurrence of Paget's disease in patients with missense VCP mutations supports a major role for VCP in normal osteoblast proliferation and regulation.
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PMID:Identification and characterization of valosin-containing protein (VCP/p97) in untransformed osteoblast-like cells. 1588 83

Previous studies demonstrated that increased Homo sapiens valosin-containing protein (VCP) may be involved in osteosarcoma (OS) metastasis. However, the underlying mechanism of VCP over-expression in OS remains unknown. In the present study, we found a significantly negative correlation between miR-129-5p and VCP protein expression in OS tissues with pulmonary metastasis (Spearman's rho, rs = -0.948). Bioinformatical prediction, Luciferase reporter assay, Western blot, and RT-PCR assays performed on OS cells indicated that VCP is a target of miR-129-5p. In addition, three CPG islands in the region of miR-129-5p promoter were detected by bioinformatical prediction, and significantly higher expression of miR-129-5p and lower methylation level of miR-129-2 gene in OS cells treated with 5-Aza-2'-deoxycytidine (a potent DNA demethylating agent) than in those untreated cells were observed. Furthermore, lower migratory and invasive ability was found in cells with elevated miR-129-5p than in those with decreased miR-129-5p. These findings indicated that increased miR-129-5p may be mediated by demethylation and inhibit OS cell migration and invasion by targeting VCP in OS, and targeting miR-129-5p/VCP signaling pathway may serve as a therapeutic strategy for OS management, although further studies will be necessary.
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PMID:Demethylation-mediated miR-129-5p up-regulation inhibits malignant phenotype of osteogenic osteosarcoma by targeting Homo sapiens valosin-containing protein (VCP). 2556 66