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The Levels of MDM2 Protein Are Decreased by a Proteasome-Mediated Proteolysis Prior to Caspase-3-Dependent pRb and PARP Cleavages

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Author(s)
Jae-We ChoJong-Chun ParkJe-Chul LeeTaeg-Kyu KwonJong-Wook ParkWon-Ki BaekSeong-ll SuhMin-Ho Suh
Keimyung Author(s)
Baek, Won KiSuh, Seong IlSuh, Min HoKwon, Taeg KyuPark, Jong Wook
Department
Dept. of Microbiology (미생물학)
Dept. of Immunology (면역학)
Journal Title
Journal of Korean Medical Science
Issued Date
2001
Volume
16
Issue
2
Keyword
HL-60 CellsUbiquitinApoptosis
Abstract
MDM2 is a substrate of caspase-3 in p53-mediated apoptosis. In addition, MDM2 mediates its own ubiquitination in a RING finger-dependent manner. Thus, we investigated whether MDM2 is degraded through a ubiquitin-dependent proteasome pathway in the absence of p53. When HL-60 cells, p53 null, were treated with etoposide, MDM2 was markedly decreased prior to caspase-3-dependent retinoblastoma tumor suppressor protein (pRb) and poly (ADP- ribose) polymerase (PARP) cleavages. Moreover, down-regulation of MDM2 level was not coupled with its mRNA down-regulation. However, the level of MDM2 was partially restored by proteasome inhibitors such as LLnL and lactacystin, even in the presence of etoposide. Our results suggest that, in the p53 null status, MDM2 protein level is decreased by proteasome-mediated proteolysis prior to caspase-3-dependent PARP and pRb cleavages.
Keimyung Author(s)(Kor)
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박종욱
Publisher
School of Medicine
Citation
Jae-We Cho et al. (2001). The Levels of MDM2 Protein Are Decreased by a Proteasome-Mediated Proteolysis Prior to Caspase-3-Dependent pRb and PARP Cleavages. Journal of Korean Medical Science, 16(2), 135–139. doi: 10.3346/jkms.2001.16.2.135
Type
Article
ISSN
1011-8934
DOI
10.3346/jkms.2001.16.2.135
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/33813
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Immunology (면역학)
1. School of Medicine (의과대학) > Dept. of Microbiology (미생물학)
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