Frontiers in Immunology (Oct 2018)

Induced B Cell Development in Adult Mice

  • Anne-Margarete Brennecke,
  • Sandra Düber,
  • Bishnudeo Roy,
  • Irene Thomsen,
  • Annette I. Garbe,
  • Annette I. Garbe,
  • Frank Klawonn,
  • Oliver Pabst,
  • Oliver Pabst,
  • Karsten Kretschmer,
  • Karsten Kretschmer,
  • Siegfried Weiss,
  • Siegfried Weiss

DOI
https://doi.org/10.3389/fimmu.2018.02483
Journal volume & issue
Vol. 9

Abstract

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We employed the B-Indu-Rag1 model in which the coding exon of recombination-activating gene 1 (Rag1) is inactivated by inversion. It is flanked by inverted loxP sites. Accordingly, B cell development is stopped at the pro/pre B-I cell precursor stage. A B cell-specific Cre recombinase fused to a mutated estrogen receptor allows the induction of RAG1 function and B cell development by application of Tamoxifen. Since Rag1 function is recovered in a non-self-renewing precursor cell, only single waves of development can be induced. Using this system, we could determine that B cells minimally require 5 days to undergo development from pro/preB-I cells to the large and 6 days to the small preB-II cell stage. First immature transitional (T) 1 and T2 B cells could be detected in the bone marrow at day 6 and day 7, respectively, while their appearance in the spleen took one additional day. We also tested a contribution of adult bone marrow to the pool of B-1 cells. Sublethally irradiated syngeneic WT mice were adoptively transferred with bone marrow of B-Indu-Rag1 mice and B cell development was induced after 6 weeks. A significant portion of donor derived B-1 cells could be detected in such adult mice. Finally, early VH gene usage was tested after induction of B cell development. During the earliest time points the VH genes proximal to D/J were found to be predominantly rearranged. At later time points, the large family of the most distal VH prevailed.

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