Mechanisms That Determine Plasma Cell Lifespan and the Duration of Humoral Immunity

Immunol Rev. 2010 Jul;236(1):125-38. doi: 10.1111/j.1600-065X.2010.00912.x.

Abstract

Humoral immunity following vaccination or infection is mainly derived from two types of cells: memory B cells and plasma cells. Memory B cells do not actively secrete antibody but instead maintain their immunoglobulin in the membrane-bound form that serves as the antigen-specific B-cell receptor. In contrast, plasma cells are terminally differentiated cells that no longer express surface-bound immunoglobulin but continuously secrete antibody without requiring further antigenic stimulation. Pre-existing serum or mucosal antibody elicited by plasma cells (or other intermediate antibody-secreting cells) represents the first line of defense against reinfection and is critical for protection against many microbial diseases. However, the mechanisms involved with maintaining long-term antibody production are not fully understood. Here, we examine several models of long-term humoral immunity and present a new model, described as the 'Imprinted Lifespan' model of plasma cell longevity. The foundation of this model is that plasma cells are imprinted with a predetermined lifespan based on the magnitude of B-cell signaling that occurs during the induction of an antigen-specific humoral immune response. This represents a testable hypothesis and may explain why some antigen-specific antibody responses fade over time whereas others are maintained essentially for life.

Publication types

  • Review

MeSH terms

  • Animals
  • Antibodies / immunology*
  • Antigens / immunology*
  • Cell Survival / immunology
  • Humans
  • Immunity, Humoral / immunology*
  • Models, Immunological
  • Plasma Cells / immunology*
  • Time Factors
  • Vaccination

Substances

  • Antibodies
  • Antigens