Cross-linking of surface Ig receptors on murine B lymphocytes stimulates the expression of nuclear tetradecanoyl phorbol acetate-response element-binding proteins
| Autor: | T C Chiles, J L Liu, T L Rothstein |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | The Journal of Immunology. 146:1730-1735 |
| ISSN: | 1550-6606 0022-1767 |
| DOI: | 10.4049/jimmunol.146.6.1730 |
| Popis: | Cross-linking of sIg on primary B lymphocytes leads to increased nuclear DNA-binding activity specific for the tetradecanoyl phorbol acetate-response element (TRE), as judged by gel mobility shift assays. Stimulation of B cells to enter S phase of the cell cycle by treatment with the combination of phorbol ester plus calcium ionophore also stimulated nuclear TRE-binding activity within 2 h, with maximal expression at 4 h; however, phorbol ester and calcium ionophore were not as effective in stimulating binding activity when examined separately. Stimulated nuclear expression of TRE-binding activity appears to require protein synthesis. Fos- and Jun/AP-1-related proteins participate directly in the identified nucleoprotein complex, as shown by the ability of c-fos- and c-jun-specific antisera to either alter or completely abolish electrophoretic migration of the complex in native gels. Further, UV photo-cross-linking studies identified two major TRE-binding protein species, whose sizes correspond to TRE-binding proteins derived from HeLa cell nuclear extracts. The results suggest that in primary B cells nuclear TRE-binding activity represents a "downstream" signaling event that occurs subsequent to changes in protein kinase C activity and intracellular Ca2+ but that can be triggered "physiologically" through sIg. |
| Databáze: | OpenAIRE |
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