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Related Experiment Videos

Transcripts encoding mouse CD44 (Pgp-1, Ly-24) antigen: strain variation and induction by mitogen.

H Haegel1, R Ceredig

  • 1Laboratoire de Génétique, Moléculaire des Eucaryotes, Institut de Chimie Biologique, Strasbourg, France.

European Journal of Immunology
|June 1, 1991
PubMed
Summary
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The study shows that CD44 (cluster of differentiation 44) transcript levels increase after T cell activation, preceding surface expression changes. This finding offers insights into T cell memory identification and regulation.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • CD44 is a cell surface molecule expressed on T cells, implicated as a hyaluronic acid receptor.
  • Increased CD44 surface expression post-activation is a marker for memory T cells.
  • Previous studies have yielded conflicting results regarding CD44 transcript polyadenylation.

Purpose of the Study:

  • To quantify mouse CD44 transcripts in thymocytes and T cell lines.
  • To investigate the regulation of CD44 transcript levels following T cell activation.
  • To compare CD44 transcript levels with surface expression and Thy-1 transcript levels.

Main Methods:

  • Northern blot analysis was used to quantify CD44 and Thy-1 transcripts.
  • T cell activation was induced using phorbol 12-myristate 13-acetate (PMA).

Related Experiment Videos

  • Analysis was performed on thymocytes and a T hybridoma cell line.

    • Main Results:

    • CD44 transcripts are polyadenylated, with three major mRNA species detected (4.5, 3.5, and 1.6 kb).
    • PMA stimulation leads to a de novo protein synthesis-dependent increase in CD44 transcripts, preceding surface expression.
    • PMA stimulation decreased Thy-1 transcript levels, unlike CD44.
    • Mouse strain variations in CD44 surface expression correlated with differences in CD44 transcript levels.

    Conclusions:

    • CD44 transcript levels are regulated post-activation and precede changes in surface expression.
    • The findings provide a molecular basis for understanding CD44's role in T cell activation and memory.
    • Variations in CD44 transcript levels contribute to differences in cell surface expression across mouse strains.