MMP24 as a Target of YAP is a Potential Prognostic Factor in Cancer Patients

Area of Science:

• Biochemistry
• Cell Biology
• Oncology

Background:

• Tumor progression involves extracellular matrix (ECM) stiffening, impacting cancer cell invasion and proliferation.
• Yes-associated protein (YAP) acts as a mechanotransducer, influencing gene expression in response to mechanical cues.

Purpose of the Study:

• To investigate matrix metalloproteinase (MMP)-24 as a novel target gene of YAP.
• To elucidate the role of ECM stiffness in regulating MMP24 expression via YAP.

Main Methods:

• Culturing MCF-7 breast cancer cells on substrates of varying stiffness.
• Analyzing MMP24 expression levels following YAP knockdown and with constitutively active YAP.
• Performing chromatin immunoprecipitation (ChIP) assays to confirm YAP binding to the MMP24 promoter.

Main Results:

• MMP24 expression was significantly upregulated on stiff substrates compared to soft substrates.
• YAP knockdown reduced MMP24 expression, while active YAP increased MMP24 promoter activity.
• YAP was confirmed to bind directly to the MMP24 promoter.

Conclusions:

• ECM stiffening activates YAP, leading to increased MMP24 expression.
• MMP24 may function as a tumor suppressor by negatively regulating cancer cell aggressiveness in stiff ECM environments.
• Lower MMP24 expression in breast cancer patients is associated with poorer survival rates.