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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Steer, James H. Leong, Chengloon Zheng, Ming H. Feng, Haotian Liu, Jianzhong Feng, Xu Cheng, Taksum Pavlos, Nathan J. Xu, Jiake Joyce, David A. Kular, Jasreen |
| Description | Author Affiliation: Feng H ( Centre for Orthopaedic Research, School of Surgery, University of Western Australia, Australia.) |
| Abstract | The V-ATPase d2 protein constitutes an important subunit of the V-ATPase proton pump, which regulates bone homeostasis; however, currently little is known about its transcriptional regulation. Here, in an attempt to understand regulation of the V-ATPase d2 promoter, we identified the presence of NFATc1, microphthalmia-associated transcription factor (MITF)- and myocyte enhancer factor 2 (MEF2)-binding sites within the V-ATPase d2 promoter using complementary bioinformatic analyses, chromatin immunoprecipitation, and electromobility shift assay. Intriguingly, activation of the V-ATPase d2 promoter by NFATc1 was enhanced by either MEF2 or MITF overexpression. By comparison, coexpression of MITF and MEF2 did not further enhance V-ATPase d2 promoter activity above that of expression of MITF alone. Consistent with a role in transcriptional regulation, both NFATc1 and MITF proteins translocated from the cytosol to the nucleus during RANKL-induced osteoclastogenesis, whereas MEF2 persisted in the nucleus of both osteoclasts and their mononuclear precursors. Targeted mutation of the putative NFATc1-, MITF-, or MEF2-binding sites in the V-ATPase d2 promoter impaired its transcriptional activation. Additionally retroviral overexpression of MITF or MEF2 in RAW264.7 cells potentiated RANKL-induced osteoclastogenesis and V-ATPase d2 gene expression. Based on these data, we propose that MEF2 and MITF function cooperatively with NFATc1 to transactivate the V-ATPase d2 promoter during RANKL-induced osteoclastogenesis. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 21 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-05-22 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Microphthalmia-Associated Transcription Factor Metabolism Myogenic Regulatory Factors NFATC Transcription Factors Osteoclasts Cytology Promoter Regions, Genetic Genetics Transcriptional Activation Vacuolar Proton-Translocating ATPases Animals Base Pairing Drug Effects Binding Sites COS Cells Cell Differentiation Cell Line Cell Nucleus Cercopithecus Aethiops MEF2 Transcription Factors Mice Molecular Sequence Data Protein Binding Protein Transport RANK Ligand Pharmacology Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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