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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Sedmak, J. J. Grossberg, S. E. Kushnaryov, V. M. Macdonald, H. S. |
| Abstract | Radioiodinated mouse interferon-beta (125I-MuIFN-beta) bound with high affinity (Kd = 9.8 X 10(-10) M) to plasma membrane of L929 murine fibroblasts (4-6 X 10(3) receptor sites per cell). The binding was saturable and inhibited by a 100-fold excess of unlabeled MuIFN-beta but not by excess mouse IFN-gamma (MuIFN-gamma). MuIFN-beta bound at 4 degrees C was very rapidly internalized upon warming of the cells to 37 degrees C (t 1/2 = 1.5 min). Indirect immunoferritin labeling indicated that MuIFN-beta was initially located in coated pits and subsequently internalized by receptor-mediated endocytosis. Isolated L929 cell nuclei bound 125I-MuIFN-beta with a 7-fold higher affinity (Kd = 1.4 X 10(-10) M) and higher receptor density (about 10(4) per nucleus) than that for the plasma membrane. Binding to the nuclear membrane was inhibited by a 100-fold excess of unlabeled MuIFN-beta but not by excess MuIFN-gamma. Trypsin treatment of nuclei decreased IFN binding by 80%, suggesting that the putative nuclear receptors are protein. Specific binding of MuIFN-beta to nuclei was also shown by fluorescence and electron microscopy. We propose that the very rapid internalization of MuIFN-beta by receptor-mediated endocytosis is important in the cellular processing of IFN and that its high-affinity binding to the nuclear membrane suggests the nucleus as an intracellular site of IFN action. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 82 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1985-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Membrane Metabolism Interferon Type I Nuclear Envelope Receptors, Immunologic Animals Coated Pits, Cell-Membrane Endocytosis Immunologic Techniques L Cells (Cell Line) Mice Microscopy, Electron Receptors, Interferon Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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