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53BP2 induces apoptosis through the mitochondrial death pathway
Shinya Kobayashi1, Shinichi Kajino, Naoko Takahashi
1Department of Molecular and Cellular Biology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan.
Summary
p53 Binding Protein 2 (53BP2) interacts with key proteins and induces apoptosis. This protein initiates cell death via the mitochondrial pathway, involving caspase-9 activation and decreased mitochondrial potential.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- p53 Binding Protein 2 (53BP2) is an interacting protein with p53, Bcl-2, and the p65 subunit of nuclear factor kappaB (NF-kappaB).
- The TP53BP2 gene produces two splicing variants, 53BP2S and 53BP2L, also known as apoptosis stimulating protein 2 of p53 (ASPP2).
Purpose of the Study:
- To investigate the role of 53BP2 in apoptosis.
- To elucidate the cellular localization and mechanism of 53BP2-induced apoptosis.
Main Methods:
- Immunofluorescence to determine protein localization.
- Assays for apoptosis, including poly ADP ribose polymerase (PARP) cleavage and annexin V staining.
- Mitochondrial trans-membrane potential (ΔPsim) measurement and caspase-9 activity assays.
Main Results:
- 53BP2 proteins are primarily located in the cytoplasm.
- 53BP2 induces apoptosis, evidenced by PARP cleavage and annexin V staining.
- 53BP2 localizes to mitochondria, leading to decreased ΔPsim and caspase-9 activation.
Conclusions:
- 53BP2 induces apoptosis through the mitochondrial death pathway.
- The findings highlight 53BP2's critical role in regulating programmed cell death.