Inhibition on JNK Mimics Silencing of Wnt-11 Mediated Cellular Response in Androgen-Independent Prostate Cancer Cells

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Prostate cancer (PCa) is a leading cause of cancer death in men.
• The c-Jun N-terminal kinase (JNK) pathway regulates critical cellular functions.
• Wnt-11 is upregulated in PCa, but its downstream signalling is not fully understood.

Purpose of the Study:

• To investigate the role of the JNK pathway as a downstream mediator of Wnt-11 signalling in prostate cancer.
• To evaluate the effects of JNK inhibition on PCa cell behaviour and pathophysiology.

Main Methods:

• Utilized prostate cancer cell lines (LNCaP, DU145, PC-3) and normal epithelial cells (PNT1A).
• Administered JNKVIII, a specific JNK kinase inhibitor, to treated cells.
• Assessed changes in mitochondrial membrane potential, cell death, autophagy, and epithelial-mesenchymal transition (EMT).
• Examined metastasis-related biomarkers, cell migration, and invasion following JNK inhibition and Wnt-11 silencing.

Main Results:

• JNK inhibition reduced mitochondrial membrane potential and induced cell death in a cell-dependent manner.
• JNK inhibition increased autophagy and inhibited EMT in androgen-independent PCa cells.
• JNK inhibition and Wnt-11 silencing yielded similar effects in DU145 and PC-3 cells, decreasing metastasis markers, migration, and invasion.

Conclusions:

• JNK signalling is crucial in prostate cancer pathophysiology, potentially mediating Wnt-11-induced signals.
• Both the JNK pathway and Wnt-11 represent potential therapeutic targets for combination therapy in PCa.