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
Summary
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.
- 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.