期刊
INTERNATIONAL JOURNAL OF HEMATOLOGY
卷 111, 期 5, 页码 622-627出版社
SPRINGER JAPAN KK
DOI: 10.1007/s12185-019-02787-8
关键词
B-1a cells; Fetal derived; HSC-independent
类别
资金
- NIAID [R01AI121197]
It has been over 35 years since the discovery of a special subtype of B cells in mice. These IgM(+) B cells are named B-1 cells, whereas conventional B cells are referred to as B-2 cells. B-1 cells express Ly-1 (CD5) and CD11b antigen, which are usually expressed in T cells and myeloid cells, respectively, reside mainly in the peritoneal and pleural cavities, and secrete natural IgM antibodies in a T cell-independent manner. B-1 cells are further categorized into CD5(+) B-1a cells and CD5(-) B-1b cells. B-1 cells may develop through positive selection and secrete natural antibodies, including low-affinity-binding autoantibodies. Transplantation assays have revealed that the fetal liver, not the bone marrow (BM), is a major site for the production of B-1a cells, leading to the concept of a fetal origin for B-1a cells. This review introduces how the origin of B-1a cells has been explored, and describes the current state of knowledge gained through various approaches.
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