STARD4 promotes breast cancer cell malignancy.

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Breast cancer (BRCA) is a prevalent malignancy in women globally.
• Lipid metabolism plays a role in cancer progression.
• Steroidogenic acute regulatory protein-related lipid transfer 4 (STARD4) is a key cholesterol transporter, but its function in BRCA is largely unknown.

Purpose of the Study:

• To investigate the expression and molecular functions of STARD4 in breast cancer.
• To determine the association between STARD4 expression and patient survival.
• To elucidate the role of STARD4 in BRCA cell proliferation, apoptosis, and metastasis.

Main Methods:

• Immunohistochemical staining and analysis of public datasets to assess STARD4 expression in BRCA.
• In vitro and in vivo loss-of-function assays (including cell cytometry, proliferation assays, flow cytometry, wound healing, and Transwell assays) to evaluate STARD4's impact on BRCA cells.
• Microarray analysis and bioinformatics to identify genes regulated by STARD4.

Main Results:

• High STARD4 expression was observed in BRCA samples and linked to shorter distant metastasis-free survival.
• STARD4 knockdown suppressed BRCA cell proliferation, cell cycle progression, and migration, while increasing apoptosis.
• STARD4 was identified as an oncogene promoting BRCA progression and metastasis, regulating key genes involved in cancer phenotypes.

Conclusions:

• STARD4 acts as an oncogene in breast cancer, promoting tumor progression and metastasis.
• STARD4 expression levels are a potential prognostic biomarker for BRCA patients.
• Targeting STARD4 may offer a therapeutic strategy for breast cancer treatment.