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Related Experiment Videos

Molecular characterization of single memory B cells.

M G McHeyzer-Williams1, G J Nossal, P A Lalor

  • 1Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia.

Nature
|April 11, 1991
PubMed
Summary
This summary is machine-generated.

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Development and maintenance of a B220- memory B cell compartment.

Journal of immunology (Baltimore, Md. : 1950)·2001

Researchers developed a new method to isolate and study memory B cells, finding they proliferate but do not further mutate their antibody genes after initial exposure to an antigen.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • B-cell memory is crucial for adaptive immunity, involving somatic hypermutation and selection of high-affinity B cells.
  • The precise origin and differentiation regulation of memory B cells remain poorly understood due to isolation challenges.
  • Current molecular characterization methods are limited, restricting analysis to fused hybridoma clones.

Purpose of the Study:

  • To develop a novel system for isolating and enumerating IgG1+ memory B cells.
  • To molecularly characterize memory B cells in their physiological state.
  • To investigate the in vitro behavior and genetic stability of memory B cells.

Main Methods:

  • Six-parameter flow cytometry for cell isolation and enumeration.

Related Experiment Videos

  • Clonal cultures to assess antibody secretion and B-cell proliferation.
  • Polymerase chain reaction (PCR) for analysis of clonally expressed V genes.

    • Main Results:

    • A new system successfully isolated and enumerated IgG1+ memory B cells.
    • Isolated memory B cells proliferated extensively in vitro when stimulated.
    • Progeny of memory B cells showed somatically mutated heavy chain V genes, confirming memory status.
    • No further somatic hypermutation was observed in the progeny of memory B cells in vitro.

    Conclusions:

    • The developed method enables unambiguous identification and analysis of memory B cells.
    • Memory B cells are capable of significant proliferation post-antigenic exposure.
    • Somatic hypermutation of V genes in memory B cells is largely completed prior to this in vitro analysis.