Melanoma Cells Exposed to Clomiphene Citrate Respond With Cell Cycle Arrest and Reduced Invasiveness

Area of Science:

• Oncology
• Pharmacology
• Cell Biology

Background:

• Epidemiological studies suggest a potential link between clomiphene citrate (CC) exposure and increased malignant melanoma risk.
• The underlying mechanisms for this potential association remain largely unknown.

Purpose of the Study:

• To investigate the direct effects of clomiphene citrate (CC) on melanoma cell behavior in vitro.
• To explore the impact of CC on cell viability, cell cycle, migration, and gene expression related to epithelial-mesenchymal transition and oxidative stress.

Main Methods:

• Human melanoma cell line A375 was treated with varying concentrations of CC (2–2000 ng/mL).
• Assessed cell viability, metabolism, cell cycle progression, and cell migration.
• Analyzed gene expression of markers for epithelial-mesenchymal transition (N-cadherin/CDH2) and mitochondrial oxidative stress (SOD2).

Main Results:

• High-dose CC (2000 ng/mL) significantly reduced cell viability by 80% and induced G1-phase cell cycle arrest.
• CC exposure impaired melanoma cell migration.
• Gene expression analysis showed decreased N-cadherin/CDH2 and SOD2, indicating potential antimetastatic and prooxidant effects.

Conclusions:

• Direct in vitro exposure to clomiphene citrate does not appear to promote aggressive melanoma cell behavior.
• CC exhibited antiproliferative and antimigratory effects on melanoma cells at high concentrations.
• Further research is needed to reconcile in vitro findings with epidemiological observations.