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Ubieta, Kenia; Garcia, Mireia; Grötsch, Bettina; Uebe, Steffen; Weber, Georg F; Stein, Merle; Ekici, Arif; Schett, Georg; Mielenz, Dirk; Bozec, Aline
The Journal of experimental medicine, 07/2017, Letnik: 214, Številka: 7Journal Article
The role of AP-1 transcription factors in early B cell development and function is still incompletely characterized. Here we address the role of Fra-2 in B cell differentiation. Deletion of Fra-2 leads to impaired B cell proliferation in the bone marrow. In addition, IL-7-stimulated pro-B cell cultures revealed a reduced differentiation from large pre-B cells to small B cells and immature B cells. Gene profiling and chromatin immunoprecipitation sequencing analyses unraveled a transcriptional reduction of the transcription factors , , , and in Fra-2-deficient B cells. Moreover, expression of and , downstream targets of Irf4 and Foxo1, were also reduced in the absence of Fra-2. Pro-B cell proliferation and small pre-B cell differentiation were fully rescued by expression of and in Fra-2-deficient pro-B cells. Hence, Fra-2 is a key upstream regulator of and expression and influences proliferation and differentiation of B cells at multiple stages.
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in: SICRIS
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