Targeting SCD in SCD-amplified prostate cancer inhibits growth in bone by modulating cellular stress, mTOR, and DNA...

Area of Science:

• Oncology
• Molecular Biology
• Cancer Metabolism

Background:

• The bone microenvironment, rich in adipocytes, supports prostate cancer (PCa) metastasis.
• Mechanisms by which adipocytes promote PCa progression in bone are not fully elucidated.

Purpose of the Study:

• To investigate the role of Stearoyl-Coenzyme A Desaturase (SCD) in PCa bone metastasis.
• To determine if SCD modulates cellular stress and lipid metabolism in PCa cells within the bone microenvironment.

Main Methods:

• Analysis of SCD expression in PCa cell lines and xenograft models.
• Assessment of cellular stress markers (ER stress, DNA damage) and signaling pathways (mTOR).
• Pharmacological inhibition of SCD in vivo and in vitro studies involving co-culture with adipocytes.

Main Results:

• SCD-amplified PCa cells exhibit sensitivity to SCD loss, showing reduced spheroid size, diminished mTOR signaling, and increased ER stress.
• Adipocytes enhance SCD expression in PCa cells, and SCD loss in co-culture conditions increases DNA damage and repair pathway activation.
• Pharmacological SCD inhibition in mice reduced tumor size and increased ER stress and DNA damage in bone tumors.

Conclusions:

• SCD plays a tumor-promoting role in PCa bone metastasis by modulating cellular stress and lipid peroxidation.
• Targeting SCD, potentially in combination with DNA repair pathway modulators, may offer a therapeutic strategy for SCD-amplified PCa bone tumors.