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Isolation of Precursor B-cell Subsets from Umbilical Cord Blood
14:06

Isolation of Precursor B-cell Subsets from Umbilical Cord Blood

Published on: April 16, 2013

Evidence for progenitors of chronic lymphocytic leukemia B cells that undergo intraclonal differentiation and

M Dono1, S Hashimoto, F Fais

  • 1Department of Medicine, North Shore University Hospital, Manhasset, NY 11030, USA.

Blood
|February 15, 1996
PubMed

Insights

Researchers found that precursor B cells (IgM+) in patients with IgG+ chronic lymphocytic leukemia (CLL) may differentiate and mutate, suggesting a sequential model for CLL evolution.

Area of Science:

  • Immunology
  • Hematology
  • Molecular Biology

Background:

  • Chronic lymphocytic leukemia (CLL) is a B-cell malignancy.
  • The precise evolutionary pathway of CLL, including B-cell differentiation and isotype switching, remains incompletely understood.

Purpose of the Study:

  • To investigate the presence and characteristics of precursor B cells in patients with IgG+ B-cell CLL.
  • To explore the potential for B-cell differentiation, mutation accumulation, and isotype switching in vivo within the context of CLL.

Main Methods:

  • Analysis of peripheral blood mononuclear cells from five IgG+ B-cell CLL patients.
  • Utilized polymerase chain reaction (PCR) with isotype-specific primers (C gamma, C mu, C alpha) to amplify mRNA transcripts.
  • Compared lengths and sequences of complementary DNA (cDNA) from CLL B cells and isotype-switched B cells.

Main Results:

  • Identified dominant IgG+ CLL B cell-length cDNA using C gamma-specific primers.
  • Detected CLL-related mu- and alpha-isotype expressing cDNA in four patients, indicating clonal relatedness.
  • Sequence analysis confirmed common origin and revealed nucleotide point mutations in mu- and alpha-expressing cDNA, suggesting divergence.

Conclusions:

  • IgM+ B cells, precursors to leukemic B cells, are increased in IgG+ B-cell CLL patients.
  • These precursor cells undergo differentiation, accumulate mutations, and isotype switch in vivo.
  • Findings support a sequential-hit model for the evolution of CLL.

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