期刊
NATURE IMMUNOLOGY
卷 20, 期 10, 页码 1381-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41590-019-0469-z
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资金
- Intramural Research Program of the Eunice Kennedy Shriver National Institute of Child Health and Human Development [1ZIAHD001803-25]
- Swedish Society for Medical Research
- Canadian Institutes of Health Research [FND-154332]
- National Institutes of Health [1P01AI102853-01]
- Canada Research Chair in Developmental Immunology
- Canada Graduate Scholarship from the Natural Sciences and Engineering Research Council of Canada
Proliferation is tightly regulated during T cell development, and is limited to immature CD4(-)CD8(-) thymocytes. The major proliferative event is initiated at the 'beta-selection' stage following successful rearrangement of Tcr beta, and is triggered by and dependent on concurrent signaling by Notch and the pre-T cell receptor (TCR); however, it is unclear how these signals cooperate to promote cell proliferation. Here, we found that beta-selection-associated proliferation required the combined activity of two Skp-cullin-F-box (SCF) ubiquitin ligase complexes that included as substrate recognition subunits the F-box proteins Fbxl1 or Fbxl12. Both SCF complexes targeted the cyclin-dependent kinase inhibitor Cdkn1b for polyubiquitination and proteasomal degradation. We found that Notch signals induced the transcription of Fbxl1, whereas pre-TCR signals induced the transcription of Fbxl12. Thus, concurrent Notch and pre-TCR signaling induced the expression of two genes, Fbxl1 and Fbxl12, whose products functioned identically but additively to promote degradation of Cdkn1b, cell cycle progression, and proliferation of beta-selected thymocytes.
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