Differential Redox Regulation of Ca²⁺ Signaling and Viability in Normal and Malignant Prostate Cells

Area of Science:

• Oncology
• Cell Biology
• Biochemistry

Background:

• Prostate cancer is characterized by elevated reactive oxygen species (ROS) and impaired calcium (Ca2+) signaling.
• Novel therapeutic strategies are being developed to target these altered pathways in prostate cancer.

Purpose of the Study:

• To investigate the impact of ROS on intracellular Ca2+ and cell viability in primary human prostate epithelial cells (hPECs) and prostate cancer cell lines (LNCaP, DU145, PC3).
• To explore the role of Orai1/Orai3 heteromeric channels in store-operated Ca2+ entry (SOCE) and its redox sensitivity in prostate cancer.

Main Methods:

• Comparative analysis of intracellular Ca2+ responses to hydrogen peroxide (H2O2) in hPECs and prostate cancer cell lines.
• Assessment of store-operated Ca2+ entry (SOCE) and its sensitivity to H2O2 across different cell types.
• Correlation analysis of the Orai1/Orai3 ratio with SOCE redox sensitivity and cell viability.

Main Results:

• Prostate cancer cells exhibit altered Ca2+ signaling and are more sensitive to ROS-induced inhibition of SOCE compared to hPECs.
• The Orai1/Orai3 ratio is strongly correlated with SOCE redox sensitivity and cell viability.
• Prostate cancer cells show an increased Orai1/Orai3 ratio compared to healthy hPECs.

Conclusions:

• Store-operated Ca2+ channels in prostate cells are heteromeric Orai1/Orai3 channels.
• An elevated Orai1/Orai3 ratio in prostate cancer cells contributes to their altered Ca2+ signaling and increased sensitivity to ROS.
• Targeting Orai1/Orai3 channels represents a potential therapeutic strategy for prostate cancer.