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Related Experiment Videos

Wild-type p53 activates SAP expression in lymphoid cells.

N Nagy1, M Takahara, J Nishikawa

  • 1Microbiology and Tumor Biology Center, Karolinska Institute, 171 77 Stockholm, Sweden. Noemi.Nagy@mtc.ki.se

Oncogene
|September 21, 2004
PubMed
Summary

SAP is a key molecule in immune cell signaling and is linked to X-linked lymphoproliferative disease (XLP). This study reveals SAP is a direct target of the p53 tumor suppressor, suggesting a role in controlling cell growth and apoptosis.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • SAP (an adaptor protein) is crucial for signaling in T and NK cells via SLAM receptors.
  • Defects in SAP are linked to X-linked lymphoproliferative disease (XLP), characterized by EBV sensitivity and lymphoma risk.
  • XLP's cellular defects may involve cell cycle and apoptosis control, potentially implicating tumor suppressors like p53.

Purpose of the Study:

  • To investigate the relationship between SAP and p53.
  • To determine if SAP is regulated by wild-type p53.
  • To explore SAP's role in p53-mediated cellular functions.

Main Methods:

  • Utilized temperature-sensitive p53 in Burkitt lymphoma cell lines.
  • Assessed SAP mRNA and protein expression following p53 activation.

Related Experiment Videos

  • Employed p53 inhibitor pifithrin-alpha.
  • Performed Chromatin Immunoprecipitation (ChIP) assays to detect p53 binding to the SAP promoter.

    • Main Results:

    • SAP expression (mRNA and protein) was dependent on wild-type p53.
    • Activation of wild-type p53 induced SAP expression, which was blocked by pifithrin-alpha.
    • Cell lines with mutant p53 failed to express SAP upon p53 activation.
    • ChIP assay confirmed wild-type p53 binding to the SAP promoter region.

    Conclusions:

    • SAP is a direct transcriptional target of p53.
    • SAP likely plays a role in executing p53-dependent cellular functions, potentially related to cell cycle or apoptosis control.
    • These findings link SAP to p53's tumor suppressor activities and offer insights into XLP pathogenesis.