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A novel intracellular antigen in HL-60 cells that changes in molecular weight after granulocytic and monocytic

Y Katsura1, S Shimomura, O Takatani

  • 13rd Department of Internal Medicine, National Defense Medical College, Tokyo, Japan.

Leukemia Research
|September 1, 1995
PubMed

Insights

Researchers identified a novel antigen crucial for cell differentiation. This 100,000 M(r) antigen (p100) shifts to a 95,000 M(r) form (p95) during granulocytic or monocytic differentiation in HL-60 cells.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Cell differentiation is a fundamental biological process.
  • Understanding molecular markers of differentiation is key.
  • HL-60 cells are a promyelocytic leukemia cell line widely used in differentiation studies.

Purpose of the Study:

  • To identify and partially characterize a novel antigen involved in cellular differentiation.
  • To investigate the molecular changes of this antigen during HL-60 cell differentiation.

Main Methods:

  • Production of a monoclonal antibody (D29A8) against HL-60 cell nuclei.
  • Immunization of BALB/c mice with HL-60 cell nuclei.
  • Western blot analysis to detect antigen molecular weight.
  • Induction of HL-60 cell differentiation along granulocytic and monocytic pathways.

Main Results:

  • A novel antigen with a molecular weight of 100,000 (p100) was identified using monoclonal antibody D29A8.
  • The antibody primarily detected p100 in the nucleolus of undifferentiated HL-60 cells.
  • Upon differentiation into granulocytic or monocytic lineages, the antibody detected a 95,000 molecular weight form (p95) predominantly in the cytoplasm.

Conclusions:

  • The identified antigen exists in at least two subtypes (p100 and p95) associated with different cellular differentiation stages.
  • These antigen subtypes appear to play a significant role in the process of cellular differentiation.
  • Further research into this antigen could elucidate mechanisms of cell fate determination.

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