CD5 super(+) B cells are preferentially expanded in rabbit appendix: The role of CD5 in B cell development and selection

Although only a small proportion of mouse and human B cells are CD5 super(+), most adult rabbit B cells express CD5. However, CD5 was not detectable on the majority of B cells in neonatal appendix 1 and 3 days after birth. Cell trafficking studies demonstrated that CD5 super(+) and CD5 super(-) CD62...

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Veröffentlicht in:Developmental & Comparative Immunology 2006-01, Vol.30 (8), p.711-722
Hauptverfasser: Pospisil, Richard, Alexander, Cornelius B, Obiakor, Harold, Sinha, Rajesh K, Mage, Rose G
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creator Pospisil, Richard
Alexander, Cornelius B
Obiakor, Harold
Sinha, Rajesh K
Mage, Rose G
description Although only a small proportion of mouse and human B cells are CD5 super(+), most adult rabbit B cells express CD5. However, CD5 was not detectable on the majority of B cells in neonatal appendix 1 and 3 days after birth. Cell trafficking studies demonstrated that CD5 super(+) and CD5 super(-) CD62L super(+) B cells from bone marrow migrated into appendix. There, CD5 super(+) B cells were preferentially expanded and predominated by 2 weeks of age. In mutant ali/ali rabbits, VHa2 super(+) B cells develop through gene conversion-like alteration of rearranged VH genes upstream of deleted VH1a2. Correlated appearance of individual CD5 super(+) germinal centers and VHa2 super(+) B-cells in mutant appendix suggests that CD5 binding positively selects cells with a2 super(+) framework regions that bind CD5. Following negative and positive selection, cells with diversified rearranged heavy- and light-chain sequences exit appendix, migrate to peripheral tissues and constitute the preimmune repertoire of CD5 super(+) B cells that encounter foreign antigens.
doi_str_mv 10.1016/j.dci.2005.10.001
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title CD5 super(+) B cells are preferentially expanded in rabbit appendix: The role of CD5 in B cell development and selection
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