Special AT-Rich Sequence-Binding Protein 1 Supports Survival and Maturation of Naive B Cells Stimulated by B Cell Receptors

Takayuki Ozawa, Kentaro Fujii, Takao Sudo, Yukiko Doi, Ritsuko Nakai, Yasuhiro Shingai, Tomoaki Ueda, Yoshihiro Baba, Naoki Hosen, Takafumi Yokota

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3 Citations (Scopus)


Epigenetic mechanisms underpin the elaborate activities of essential transcription factors in lymphocyte development. Special AT-rich sequence-binding protein 1 (SATB1) is a chromatin remodeler that orchestrates the spatial and temporal actions of transcription factors. Previous studies have revealed the significance of SATB1 in T cell lineage. However, whether and how SATB1 controls B cell lineage development is yet to be clarified. In this study, we show that SATB1 is an important factor during splenic B cell maturation. By analyzing SATB1/Tomato reporter mice, we determined the dynamic fluctuation of SATB1 expression in the B cell lineage. Although SATB1 expression decreased to minimal levels during B cell differentiation in the bone marrow, it resurged markedly in naive B cells in the spleen. The expression was dramatically downregulated upon Ag-induced activation. Splenic naive B cells were subdivided into two categories, namely SATB1high and SATB12/low, according to their SATB1 expression levels. SATB1high naive B cells were less susceptible to death and greater proliferative than were SATB12/low cells during incubation with an anti-IgM Ab. Additionally, SATB1high cells tended to induce the expression of MHC class II, CD86, and CD83. Accordingly, naive B cells from B lineage-specific SATB1 conditional knockout mice were more susceptible to apoptosis than that in the control group upon anti-IgM Ab stimulation in vitro. Furthermore, conditional knockout mice were less capable of producing Ag-specific B cells after immunization. Collectively, our findings suggest that SATB1 expression increases in naive B cells and plays an important role in their survival and maturation.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJournal of Immunology
Issue number8
Publication statusPublished - Apr 15 2022

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology


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