Regulation and functions of Blimp-1 in T and B lymphocytes

Annu Rev Immunol. 2008;26:133-69. doi: 10.1146/annurev.immunol.26.021607.090241.

Abstract

B lymphocyte-induced maturation protein-1 (Blimp-1), discovered 16 years ago as a transcriptional repressor of the IFNbeta promoter, plays fundamentally important roles in many cell lineages and in early development. This review focuses on Blimp-1 in lymphocytes. In the B cell lineage, Blimp-1 is required for development of immunoglobulin-secreting cells and for maintenance of long-lived plasma cells (LLPCs). Direct targets of Blimp-1 and the transcriptional cascades Blimp-1 initiates to trigger plasmacytic differentiation are described. Blimp-1 also affects the homeostasis and function of CD4(+), CD8(+), and regulatory CD4(+) T cells, and Blimp-1 levels are highest in antigen-experienced T cells. Blimp-1 attenuates T cell proliferation and survival and modulates differentiation. Roles for Blimp-1 in Th1/Th2 specification, regulatory T cell function, and CD8 differentiation and function are under investigation. Signals that induce Blimp-1 in B cells include Toll-like receptor ligands and cytokines; in T cells, T cell receptors and cytokines induce Blimp-1. In spite of some commonalities, different targets and regulators of Blimp-1 in B and T cells suggest intriguing evolutionary divergence of this regulatory machinery.

Publication types

  • Research Support, N.I.H., Extramural
  • Review

MeSH terms

  • Animals
  • B-Lymphocytes / cytology
  • B-Lymphocytes / physiology*
  • Cell Differentiation
  • Humans
  • Mice
  • Models, Biological
  • Positive Regulatory Domain I-Binding Factor 1
  • Repressor Proteins / physiology*
  • T-Lymphocytes / cytology
  • T-Lymphocytes / physiology*
  • Transcription Factors / physiology*

Substances

  • Prdm1 protein, mouse
  • Repressor Proteins
  • Transcription Factors
  • PRDM1 protein, human
  • Positive Regulatory Domain I-Binding Factor 1