Cancer-bone microenvironmental interactions promotes STAT3 signaling

Area of Science:

• Oncology
• Biochemistry
• Cell Biology

Background:

• Prostate cancer (PCa) mortality is often linked to bone metastasis.
• Tumor cell interactions with the bone microenvironment are critical for metastasis.

Purpose of the Study:

• To investigate the role of prostate cancer cell-hydroxyapatite interactions in promoting paracrine signaling.
• To identify molecular pathways involved in PCa bone metastasis.

Main Methods:

• Co-culturing PCa cell lines with hydroxyapatite (HA) of varying densities.
• Analyzing conditioned media for calcium levels and effects on cell signaling, migration, and viability.
• Investigating the role of Snail protein, calcium, and STAT3 signaling in vitro and in vivo.

Main Results:

• PCa cell-bone cocultures showed elevated calcium levels, which were antagonized by EGTA or Snail knockdown.
• Conditioned media increased STAT3 phosphorylation, proliferation, and migration, inhibited by EGTA, WP1066, or Z-FY-CHO.
• In vivo studies demonstrated increased tumorigenicity and migration with higher HA bone density.

Conclusions:

• PCa cell-bone microenvironment interactions activate a calcium-STAT3 signaling pathway.
• This pathway represents a potential therapeutic target for metastatic prostate cancer.