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

Cell Rep. 2023 Apr 25;42(4):112378. doi: 10.1016/j.celrep.2023.112378. Epub 2023 Apr 14.

Abstract

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.

Keywords: AKT; ALPS; B cells; CD148; CP: Developmental biology; CP: Immunology; FoxO1; NOTCH2; marginal zone B cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • B-Lymphocytes*
  • Humans
  • Lymphoid Tissue
  • Mice
  • Proto-Oncogene Proteins c-akt*
  • Signal Transduction
  • Spleen

Substances

  • Proto-Oncogene Proteins c-akt