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Related Experiment Videos

T cell expressed PKCtheta demonstrates cell-type selective function.

B Bauer1, N Krumböck, N Ghaffari-Tabrizi

  • 1Department of Medical Biology and Human Genetics, University of Innsbruck, Innsbruck, Austria.

European Journal of Immunology
|February 13, 2001
PubMed
Summary
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Protein kinase C theta (PKCtheta) is essential for T lymphocyte activation and interleukin-2 (IL-2) expression. This PKC isoform shows cell-type specific function and expression, particularly in lymphoid organs.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T lymphocyte activation, crucial for immune responses, involves complex signaling pathways.
  • Interleukin-2 (IL-2) expression is a key event in T cell activation, but the specific protein kinase C (PKC) isoforms involved remain unclear.

Purpose of the Study:

  • To systematically identify the specific protein kinase C (PKC) isoforms responsible for T lymphocyte activation and interleukin-2 (IL-2) expression.
  • To investigate the cell-type specificity and functional role of PKC isoforms in T cell signaling.

Main Methods:

  • Screening of seven major T cell expressed PKC isoforms (PKCalpha, delta, epsilon, zeta, nu, theta, and iota).
  • Utilizing a conditionally activated PKCtheta-estrogen-receptor fusion mutant to study de novo synthesis-independent transactivation of JNK2.

Related Experiment Videos

  • Employing mRNA in situ hybridization on mouse whole body sections to determine PKCtheta expression patterns.
  • Conducting ectopic expression studies in COS-1 and NIH3T3 cells to assess isoenzyme-selective function.

    • Main Results:

    • PKCtheta was identified as essential for IL-2 expression in Jurkat T cells, acting via the NF-AT and NF-kappaB enhancer.
    • A PKCtheta-estrogen-receptor fusion mutant demonstrated de novo synthesis-independent transactivation of JNK2.
    • PKCtheta exhibited high expression in lymphoid organs, skeletal muscle, and the nervous system.
    • PKCtheta's isoenzyme-selective function was not observed in non-T cell lines, indicating cell-type specificity.

    Conclusions:

    • PKCtheta is the primary target for phorbol ester-mediated activation in T cell signaling.
    • Both the gene expression and function of PKCtheta are strictly regulated by the cell type.
    • These findings elucidate a critical pathway in T cell activation and highlight the cell-specific roles of PKC isoforms.