Site-specific O-GlcNAcylation of progesterone receptor (PR) supports PR attenuation of interferon stimulated genes (ISGs) and tumor growth in breast cancer
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View abstract on PubMed
Summary
This summary is machine-generated.Progesterone receptor (PR) O-GlcNAcylation is crucial for hormone-driven breast cancer growth. This modification regulates PR
Area Of Science
- Molecular Biology
- Cancer Research
- Endocrinology
Background
- Hormone receptor-positive (HR+) breast cancer, driven by estrogen receptor (ER) and/or progesterone receptor (PR), is the most common type.
- PR plays a key role in tumor growth, independent of or in conjunction with ER.
- Posttranslational modifications, including O-linked β-N-acetylglucosamine (O-GlcNAc), regulate protein function, but PR-specific O-GlcNAcylation sites and functions remain uncharacterized.
Purpose Of The Study
- To identify and characterize specific O-GlcNAcylation sites on the progesterone receptor (PR).
- To investigate the functional impact of PR O-GlcNAcylation on PR activity and breast cancer progression.
- To elucidate the role of PR O-GlcNAcylation in regulating interferon signaling in HR+ breast cancer.
Main Methods
- Utilized established PR-expressing breast cancer cell lines.
- Mapped O-GlcNAcylation sites on PR.
- Performed RNA-sequencing following PR O-GlcNAc site mutagenesis to assess functional consequences.
Main Results
- Several O-GlcNAcylation sites on PR were identified.
- Site-specific O-GlcNAcylation of PR is essential for the ligand-independent suppression of interferon signaling.
- O-GlcNAcylation of PR was found to enhance PR-driven tumor growth in vivo.
Conclusions
- Site-specific O-GlcNAcylation is a critical regulatory mechanism for PR function in breast cancer.
- PR O-GlcNAcylation influences interferon signaling pathways, impacting tumor growth.
- Understanding PR O-GlcNAcylation offers potential new therapeutic strategies for HR+ breast cancer.
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