Cell Reports (Apr 2023)

AKT activity orchestrates marginal zone B cell development in mice and humans

  • Eva-Maria Cox,
  • Mohamed El-Behi,
  • Stefanie Ries,
  • Johannes F. Vogt,
  • Vivien Kohlhaas,
  • Thomas Michna,
  • Benoît Manfroi,
  • Mona Al-Maarri,
  • Florian Wanke,
  • Boaz Tirosh,
  • Corinne Pondarre,
  • Harry Lezeau,
  • Nir Yogev,
  • Romy Mittenzwei,
  • Marc Descatoire,
  • Sandra Weller,
  • Jean-Claude Weill,
  • Claude-Agnès Reynaud,
  • Pierre Boudinot,
  • Luc Jouneau,
  • Stefan Tenzer,
  • Ute Distler,
  • Anne Rensing-Ehl,
  • Christoph König,
  • Julian Staniek,
  • Marta Rizzi,
  • Aude Magérus,
  • Frederic Rieux-Laucat,
  • F. Thomas Wunderlich,
  • Nadine Hövelmeyer,
  • Simon Fillatreau

Journal volume & issue
Vol. 42, no. 4
p. 112378

Abstract

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Summary: The signals controlling marginal zone (MZ) and follicular (FO) B cell development remain incompletely understood. Here, we show that AKT orchestrates MZ B cell formation in mice and humans. Genetic models that increase AKT signaling in B cells or abolish its impact on FoxO transcription factors highlight the AKT-FoxO axis as an on-off switch for MZ B cell formation in mice. In humans, splenic immunoglobulin (Ig) D+CD27+ B cells, proposed as an MZ B cell equivalent, display higher AKT signaling than naive IgD+CD27− and memory IgD−CD27+ B cells and develop in an AKT-dependent manner from their precursors in vitro, underlining the conservation of this developmental pathway. Consistently, CD148 is identified as a receptor indicative of the level of AKT signaling in B cells, expressed at a higher level in MZ B cells than FO B cells in mice as well as humans.

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