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Related Experiment Videos

Decrease in IGF-I binding sites on human promyelocytic leukemia cell line (HL-60) with differentiation.

I Sukegawa1, N Hizuka, K Takano

  • 1Department of Medicine, Tokyo Women's Medical College, Japan.

Endocrinologia Japonica
|June 1, 1987
PubMed
Summary

Human promyelocytic leukemia cells (HL-60) express specific insulin-like growth factor I (IGF-I) receptors. Differentiation into macrophage-like cells significantly reduces the number of these IGF-I receptors.

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Area of Science:

  • Cell Biology
  • Endocrinology
  • Molecular Biology

Background:

  • The human promyelocytic leukemia cell line (HL-60) serves as a model for studying cellular differentiation and receptor expression.
  • Insulin-like growth factor I (IGF-I) plays crucial roles in cell growth, differentiation, and survival.
  • Understanding IGF-I receptor dynamics is vital for comprehending cellular responses to growth factors.

Purpose of the Study:

  • To identify and characterize specific insulin-like growth factor I (IGF-I) receptors on HL-60 cells.
  • To investigate the modulation of IGF-I receptor expression during HL-60 cell differentiation.
  • To determine the impact of differentiation on IGF-I receptor binding affinity and number.

Main Methods:

  • Radioligand binding assays using [125I]IGF-I to assess receptor binding and specificity.

Related Experiment Videos

  • Competitive binding studies with unlabeled IGF-I, multiplication stimulating activity (MSA), and porcine insulin.
  • Affinity labeling techniques to confirm the presence of IGF type I receptors.
  • Cell differentiation induced by 12-o-tetra-decanoyl-phorbol-13-acetate (TPA) and 1,25-dihydroxy-vitamin D3 (1,25(OH)2D3).
  • Scatchard analysis to quantify receptor number and affinity.

    • Main Results:

    • Specific binding of [125I]IGF-I to HL-60 cells was observed, with displacement by unlabeled IGF-I in a dose-dependent manner.
    • IGF-I receptors exhibited higher affinity for IGF-I compared to MSA and porcine insulin.
    • Affinity labeling confirmed the presence of IGF type I receptors on HL-60 cells.
    • Differentiation of HL-60 cells into macrophage-like cells led to a significant decrease in [125I]IGF-I binding.
    • Scatchard analysis revealed that this decrease was primarily due to a reduction in the number of IGF-I receptors.

    Conclusions:

    • HL-60 cells possess specific IGF-I receptors that can be characterized by binding assays and affinity labeling.
    • Cellular differentiation of HL-60 cells into macrophage-like cells is associated with a significant downregulation of IGF-I receptors.
    • The number of IGF-I receptors, rather than their affinity, is the primary factor affected during HL-60 cell differentiation.