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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Miller, D. G. Kabat, D. Kozak, S. L. Kavanaugh, M. P. Miller, A. D. Law, W. Zhang, W. |
| Description | Author Affiliation: Kavanaugh MP ( Vollum Institute for Advanced Biomedical Research, Oregon Health Sciences University, Portland 97201.); |
| Abstract | Cell surface receptors for gibbon ape leukemia virus (Glvr-1) and murine amphotropic retrovirus (Ram-1) are distinct but related proteins having multiple membrane-spanning regions. Distant homology with a putative phosphate permease of Neurospora crassa suggested that these receptors might serve transport functions. By expression in Xenopus laevis oocytes and in mammalian cells, we have identified Glvr-1 and Ram-1 as sodium-dependent phosphate symporters. Two-electrode voltage-clamp analysis indicates net cation influx, suggesting that phosphate is transported with excess sodium ions. Phosphate uptake was reduced by > 50% in mouse fibroblasts expressing amphotropic envelope glycoprotein, which binds to Ram-1, indicating that Ram-1 is a major phosphate transporter in these cells. RNA analysis shows wide but distinct tissue distributions, with Glvr-1 expression being highest in bone marrow and Ram-1 in heart. Overexpression of Ram-1 severely repressed Glvr-1 synthesis in fibroblasts, suggesting that transporter expression may be controlled by net phosphate accumulation. Accordingly, depletion of extracellular phosphate increased Ram-1 and Glvr-1 expression 3- to 5-fold. These results suggest simple methods to modulate retroviral receptor expression, with possible applications to human gene therapy. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 15 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Carrier Proteins Metabolism Leukemia Virus, Gibbon Ape Leukemia Virus, Murine Phosphate Transport Proteins Phosphates Receptors, Virus Symporters 3T3 Cells Animals Biological Transport Cell Line Gene Expression Mice Oocytes Phosphate-Binding Proteins Genetics Recombinant Proteins Sodium Sodium-Phosphate Cotransporter Proteins Sodium-Phosphate Cotransporter Proteins, Type III Xenopus Laevis Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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