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Related Experiment Videos

Plasma cell ontogeny defined by quantitative changes in blimp-1 expression.

Axel Kallies1, Jhagvaral Hasbold, David M Tarlinton

  • 1The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria, 3050, Australia.

The Journal of Experimental Medicine
|October 20, 2004
PubMed
Summary
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The transcriptional regulator B lymphocyte--induced maturation protein 1 (Blimp-1) is crucial for plasma cell development. Increasing Blimp-1 levels mark distinct stages in the differentiation of antibody-secreting cells (ASCs).

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Plasma cells are terminally differentiated B cells essential for antibody production.
  • The transcriptional regulator B lymphocyte--induced maturation protein 1 (Blimp-1) is critical for plasma cell development.

Purpose of the Study:

  • To investigate the role of Blimp-1 expression levels in plasma cell differentiation.
  • To characterize the heterogeneity of antibody-secreting cells (ASCs) in vivo and in vitro.

Main Methods:

  • Generation of heterozygous mice with a green fluorescent protein (GFP) reporter inserted into the Blimp-1 locus.
  • Analysis of GFP expression in ASCs in vivo (following immunization) and in vitro.
  • Assessment of surface phenotype, immunoglobulin secretion rate, and Blimp-1 expression levels in ASCs.

Related Experiment Videos

Main Results:

  • GFP reporter expression confirmed Blimp-1 expression in all antibody-secreting cells (ASCs) in vivo and in vitro.
  • Significant heterogeneity was observed in the surface phenotype, immunoglobulin secretion rate, and Blimp-1 levels of in vitro ASCs.
  • In vivo analysis revealed a developmental pathway for ASCs where increasing Blimp-1 expression correlates with distinct differentiation stages.

Conclusions:

  • Quantitative increases in Blimp-1 expression are essential for the maturation of transient plasmablasts into long-lived bone marrow ASCs.
  • Blimp-1 expression levels serve as a molecular marker for defining developmental stages in plasma cell differentiation.