期刊
JOURNAL OF IMMUNOLOGY
卷 192, 期 6, 页码 2699-2714出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1301312
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资金
- High-Technology Research and Development Program of China (863) [2012AA092202]
- National Basic Research Program of China (973) [2012CB114404, 2012CB114402]
- National Natural Science Foundation of China [31072234, 31172436, 31272691, 31372554]
- Program for Key Innovative Research Team of Zhejiang Province [2010R50026]
- Scientific Research Fund of Zhejiang Provincial Science and Technology Department [2013C12907-9]
- Scholarship Award for Excellent Doctoral Student
- Ministry of Education
The long-held paradigm that B cells cannot uptake nonspecific particulate Ags for the initiation of primary adaptive immunity has been challenged by the recent discovery that teleost B cells have potent phagocytic and microbicidal abilities. This discovery provides preliminary clues that primitive B cells might act as initiating APCs in priming adaptive immunity. In this study, zebrafish B cells clearly showed a potent Ag-presenting ability to both soluble Ags and bacterial particles to prime naive CD4(+) T cell activation. This finding demonstrates the innate-like nature of teleost B cells in the interface of innate and adaptive immunity, indicating that they might consist of a major population of initiating APCs whose performance is similar to that of dendritic cells. Given the functional similarities between teleost B cells and the mammalian B-1 subset, we hypothesize that B-1 lineage and teleost B cells might originate from a common ancestor with potent phagocytic and initiating APC capacities. In addition, CD80/86 and CD83 costimulatory signals were identified as being essential for B cell-initiated adaptive immunity. This result suggests that the costimulatory mechanism originated as early as the origin of adaptive immunity and is conserved throughout vertebrate evolution. In fish, only a single CD80/86 copy exists, which is similar to mammalian CD86 rather than to CD80. Thus, CD86 might be a more primordial B7 family member that originated from fish. This study provides valuable insights into the evolutionary history of professional APCs, B cell lineages, and the costimulatory mechanism underlying adaptive immunity as a whole.
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