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Related Experiment Videos

Regulation of CD45 expression in human leukemia cells.

R Taetle1, H Ostergaard, M Smedsrud

  • 1Division of Hematology/Oncology, University of California, San Diego.

Leukemia
|April 1, 1991
PubMed
Summary

CD45 antigen expression and activity increase during myeloid cell maturation, controlled by gene transcription. This protein tyrosine phosphatase shows substrate specificity in vivo.

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Area of Science:

  • Hematology
  • Molecular Biology
  • Cell Biology

Background:

  • CD45 antigen, a tyrosine phosphatase, is crucial for hemopoietic cell function.
  • Its expression and role in myeloid differentiation are not fully understood.
  • Mechanisms controlling CD45 gene expression and function require further investigation.

Purpose of the Study:

  • To investigate the regulation of CD45 expression during myeloid differentiation.
  • To determine the functional impact of CD45 on protein tyrosine kinase activity.

Main Methods:

  • Induction of differentiation in HL60 and Namalwa leukemia cell lines.
  • Analysis of CD45 antigen expression and PTPase activity.
  • Radiolabeling, immunoprecipitation, Northern blotting, and nuclear transcription assays.
  • Assessment of CD45 interaction with epidermal growth factor (EGF) receptor.

Main Results:

  • HL60 cell differentiation induced increased CD45 expression and PTPase activity.
  • DMSO treatment of HL60 cells increased CD45 transcripts via gene transcription.
  • CD45 PTPase activity did not affect EGF receptor tyrosine phosphorylation in Namalwa cells.

Conclusions:

  • CD45 expression is upregulated during myeloid maturation at the transcriptional level.
  • CD45 exhibits substrate specificity, not affecting EGF receptor tyrosine kinase activity in intact cells.

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