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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
PubMed
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.

Keywords:
BCSC-1Co-IP-MSPathway analysisProtein-protein interactionVWA5A

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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.