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Published on: May 17, 2019
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Mapping the BCSC-1 interactome in breast cancer
Yuan Ma1,2, Qingchen Zhang1, Jiyu Ju1
1Key Laboratory of Immune Microenvironment and Inflammatory Disease Research in Universities of Shandong Province, Shandong Second Medical University, Weifang, 261053, Shandong Province, China.
Scientific Reports
|October 21, 2025
Summary
Breast cancer suppressor candidate-1 (BCSC-1) interacts with 341 proteins, influencing cell migration and proteostasis. Its VIT domain is crucial for regulating breast cancer cell movement.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Breast cancer suppressor candidate-1 (BCSC-1), also known as VWA5A, is downregulated in various cancers, including breast cancer.
- The precise functions and mechanisms of BCSC-1 in tumorigenesis remain largely unknown.
- Understanding protein-protein interactions is key to elucidating novel protein functions.
Purpose of the Study:
- To identify the protein-protein interaction network of BCSC-1.
- To investigate the role of BCSC-1 in breast cancer cell migration.
- To determine the domains of BCSC-1 involved in its cellular functions.
Main Methods:
- Stable transfection of breast cancer cells (MCF-7) with BCSC-1.
- Co-immunoprecipitation coupled with mass spectrometry (Co-IP-MS) to identify interacting proteins.
- Bioinformatic analysis, Western blotting, immunofluorescence (IF), and plasmid transfections to validate interactions and study cell migration.
Main Results:
- 341 significant interacting partners of BCSC-1 were identified.
- Interacting proteins are involved in proteostasis (lysosome, proteasome), lipid metabolism (peroxisome), vesicle transport, and actin cytoskeleton regulation.
- BCSC-1 co-localizes with STAT1, STAT3, and CDC42, and is found at the leading edge of migrating cells.
- The VIT domain of BCSC-1 is essential for regulating cell migration.
Conclusions:
- BCSC-1 interacts with a diverse set of proteins, suggesting multifaceted roles in cellular processes.
- BCSC-1 plays a role in regulating breast cancer cell migration, potentially through its VIT domain.
- The identified interactors provide insights into the molecular mechanisms underlying BCSC-1's function in cancer.
