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Related Experiment Videos

ASPP proteins specifically stimulate the apoptotic function of p53.

Y Samuels-Lev1, D J O'Connor, D Bergamaschi

  • 1Ludwig Institute for Cancer Research, Imperial College School of Medicine, St. Mary's Campus, Norfolk Place, London W2 1PG, United Kingdom.

Molecular Cell
|October 31, 2001
PubMed
Summary

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ASPP proteins enhance the tumor-suppressing activity of p53, specifically promoting apoptosis. Their downregulation in breast cancer suggests ASPP proteins are crucial for p53

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • The tumor suppressor protein p53 plays a critical role in preventing cancer.
  • p53's tumor suppressive functions are mediated through apoptosis induction and cell cycle arrest.
  • The precise mechanisms regulating p53's apoptotic function remain incompletely understood.

Purpose of the Study:

  • To identify novel regulators of p53's apoptotic function.
  • To investigate the role of ASPP proteins in p53-mediated apoptosis.
  • To explore the clinical relevance of ASPP expression in human cancers.

Main Methods:

  • Protein interaction studies to confirm ASPP and p53 binding.
  • In vivo assays to assess p53 transactivation and apoptosis induction.

Related Experiment Videos

  • Analysis of ASPP expression in human breast carcinoma tissues.

    • Main Results:

    • ASPP proteins specifically enhance p53-induced apoptosis, not cell cycle arrest.
    • ASPP proteins augment p53's DNA binding and transactivation of pro-apoptotic gene promoters.
    • ASPP expression is frequently downregulated in wild-type p53-expressing breast carcinomas.

    Conclusions:

    • ASPP proteins are critical co-activators of p53's apoptotic function.
    • ASPP proteins regulate the tumor suppressor activity of p53 in vivo.
    • Downregulation of ASPP may contribute to tumorigenesis by impairing p53-mediated apoptosis.