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Investigation of SSEA-4 binding protein in breast cancer cells
Ting-Chun Hung1, Chih-Wei Lin, Tsui-Ling Hsu
1Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
Abstract:
SSEA-4, a sialyl-glycolipid, has been commonly used as a pluripotent human embryonic stem cell marker, and its expression is correlated with the metastasis of some malignant tumors. However, there is no in-depth functional study related to the receptor and the role of this glycolipid. Here, we report the identification of an SSEA-4-binding protein in a breast cancer cell line, MCF-7. By using affinity capture and glycan microarray techniques, the intracellular FK-506 binding protein 4 (FKBP4) was identified to bind directly to SSEA-4. The biological significance of SSEA-4/FKBP4 interaction was investigated.
Insights
Researchers identified FKBP4 as a protein that binds to SSEA-4, a marker for pluripotent stem cells and tumor metastasis. This discovery opens new avenues for understanding SSEA-4
Area of Science:
- Glycobiology
- Cancer Biology
- Stem Cell Research
Background:
- Stage-specific embryonic antigen 4 (SSEA-4) is a recognized marker for human embryonic stem cells.
- SSEA-4 expression is linked to metastasis in several types of cancer.
- The specific receptor for SSEA-4 and its functional role remain largely uncharacterized.
Purpose of the Study:
- To identify proteins that bind to SSEA-4.
- To investigate the functional significance of the SSEA-4/protein interaction in cancer cells.
Main Methods:
- Affinity capture techniques were employed to isolate SSEA-4 binding proteins.
- Glycan microarray analysis was utilized for protein-glycan interaction studies.
- Experiments were conducted using the MCF-7 breast cancer cell line.
Main Results:
- The intracellular FK-506 binding protein 4 (FKBP4) was identified as a direct binding partner of SSEA-4.
- The interaction between SSEA-4 and FKBP4 was confirmed through biochemical assays.
Conclusions:
- FKBP4 is identified as a novel SSEA-4 binding protein.
- This finding provides a foundation for exploring the biological roles of the SSEA-4/FKBP4 interaction in cancer progression and potentially other biological contexts.
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