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Related Experiment Videos

Prothymosin alpha receptors on lymphocytes

O J Cordero1, C Sarandeses, M Nogueira

  • 1Department of Biochemistry and Molecular Biology, University of offtiago de Compostela, Galicia, Spain.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|August 1, 1995
PubMed
Summary

Prothymosin alpha (ProT alpha) binds to specific receptors on T cells, with varying affinity and numbers. Receptor dynamics influence ProT alpha

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Prothymosin alpha (ProT alpha) shows potential for cancer therapeutics and immune system enhancement.
  • Previous studies identified two ProT alpha binding sites on human peripheral blood mononuclear cells (PBMC).

Purpose of the Study:

  • To investigate ProT alpha receptor expression and characteristics on specific lymphocytic populations: PHA-activated lymphoblasts and YT cells.
  • To determine if ProT alpha receptor expression is upregulated on these cells.

Main Methods:

  • Radioligand binding assays using [125I]ProT alpha.
  • Kinetic and steady-state binding analyses on lymphoblasts and YT cells.
  • Characterization of binding sites, including equilibrium dissociation constant (Kd) and receptor number per cell.

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Main Results:

  • Lymphoblasts exhibit two ProT alpha binding sites with high (Kd 44-75 pM) and low (Kd 1.7-2.9 nM) affinities.
  • YT cells display a single binding site with intermediate affinity (Kd 265-435 pM).
  • Binding kinetics differed between lymphoblasts (fast) and YT cells (slower).

Conclusions:

  • A regulated ProT alpha receptor exists on CD3+ T cells.
  • Internalization and degradation of bound [125I]ProT alpha occur rapidly.
  • ProT alpha receptor turnover dynamics influence the availability of ProT alpha for its biological effects.