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PRL-3 activates NF-κB signaling pathway by interacting with RAP1
Shenyi Lian1, Lin Meng, Caiyun Liu
1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Biochemistry and Molecular Biology, Peking University Cancer Hospital & Institute, Beijing 100142, China.
Biochemical and Biophysical Research Communications
|November 27, 2012
Summary
Phosphatase of regenerating liver (PRL-3) interacts with RAP1, promoting its cytosolic localization and influencing NF-κB signaling. This study reveals PRL-3
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Phosphatase of regenerating liver (PRL-3) is known to promote cancer metastasis.
- The specific role of PRL-3 in tumorigenesis and its molecular mechanisms are not fully understood.
Purpose of the Study:
- To investigate the interaction between PRL-3 and telomere-related protein RAP1.
- To elucidate the role of PRL-3 in regulating RAP1 localization and NF-κB signaling pathway.
Main Methods:
- Co-immunoprecipitation to study PRL-3 and RAP1 interaction.
- Immunohistochemical staining on colon cancer tissue arrays (n=170).
- Microarray analysis to assess gene expression changes.
- Western blot to detect protein phosphorylation, specifically p65 subunit of NF-κB.
Main Results:
- PRL-3 was found to interact with RAP1 and promote its cytosolic localization.
- High PRL-3 levels correlated with cytosolic RAP1 localization in colon cancer tissues (p=0.01).
- PRL-3 regulates diverse gene expression and enhances p65 phosphorylation in a RAP1-dependent manner.
- PRL-3 transcriptionally activates RAP1 expression, a process dependent on p65.
Conclusions:
- PRL-3 interacts with RAP1, influencing its subcellular localization.
- PRL-3 modulates the NF-κB signaling pathway via RAP1.
- PRL-3 acts as a novel regulator of the NF-κB pathway through RAP1, offering potential therapeutic targets.
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