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Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation
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Published on: November 26, 2018

Aberrant O-GlcNAcylation characterizes chronic lymphocytic leukemia.

Y Shi1, J Tomic, F Wen

  • 1Division of Molecular and Cellular Biology, Research Institute, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada.

Leukemia
|July 30, 2010
PubMed
Summary

Chronic lymphocytic leukemia (CLL) cells show elevated O-linked N-Acetylglucosamine (O-GlcNAc) levels, impacting signaling. High O-GlcNAc correlates with disease behavior, suggesting therapeutic potential.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Aberrant cellular signaling is a hallmark of chronic lymphocytic leukemia (CLL).
  • O-linked N-Acetylglucosamine (O-GlcNAc) is a post-translational modification regulated by the hexosamine pathway, influencing intracellular signaling.
  • The role of O-GlcNAcylation in CLL pathogenesis is not well understood.

Purpose of the Study:

  • To investigate O-GlcNAcylated protein levels in primary CLL cells.
  • To determine the relationship between O-GlcNAcylation and CLL cell signaling responses.
  • To explore the correlation between O-GlcNAc levels and clinical behavior in CLL.

Main Methods:

  • Quantification of O-GlcNAcylated proteins in primary CLL cells and normal B cells.
  • Assessment of O-GlcNAc levels following cellular activation (cytokines, TLRs) and hexosamine pathway substrate loading.
  • Analysis of signaling responses to various stimuli (TLR agonists, chemotherapy, BCR crosslinking, mitogens) in relation to O-GlcNAc levels.
  • Correlation of O-GlcNAc levels with indolent and aggressive CLL clinical behavior.

Main Results:

  • CLL cells exhibited significantly higher O-GlcNAcylated protein levels compared to normal B cells, including key proteins like p53, c-myc, and Akt.
  • O-GlcNAcylation levels in CLL cells increased upon activation via cytokines, toll-like receptors (TLRs), or hexosamine pathway substrate loading.
  • Elevated baseline O-GlcNAc levels were associated with impaired signaling responses to multiple stimuli, including TLR agonists, chemotherapeutic agents, B cell receptor crosslinking, and mitogens.
  • Higher O-GlcNAc levels correlated with indolent CLL, while lower levels were associated with aggressive disease behavior.

Conclusions:

  • Intracellular O-GlcNAcylation is elevated in CLL cells and is linked to altered signaling pathways.
  • O-GlcNAc levels in CLL cells correlate with disease aggressiveness and clinical behavior.
  • Targeting O-GlcNAcylation pathways may represent a novel therapeutic strategy for CLL.