Metabolic Reprogramming Triggered by Fluoride in U-87 Glioblastoma Cells: Implications for Tumor Progression?

Area of Science:

• Neuro-oncology
• Toxicology
• Cell Biology

Background:

• Chronic inflammation is characteristic of brain tumors, particularly gliomas.
• The role of fluoride in inducing metabolic disturbances and oxidative stress in aggressive glioma cells is not well understood.

Purpose of the Study:

• To investigate the effects of physiologically elevated fluoride concentrations on oxidative stress and pro-inflammatory responses in U-87 human glioblastoma cells.

Main Methods:

• U-87 glioblastoma cells were exposed to varying concentrations of sodium fluoride (NaF) (0.1-10 µM) for short-term and long-term periods.
• Analysis included assessment of reactive oxygen species (ROS) levels, antioxidant defenses, and key cytokines/chemokines in cells and culture medium.

Main Results:

• Fluoride exposure at physiologically relevant concentrations significantly increased ROS levels in U-87 cells.
• Elevated levels of pro-inflammatory cytokines, including IL-6 and TNF-α, were observed, correlating with fluoride concentration and exposure duration.

Conclusions:

• Fluoride compounds can induce oxidative stress by generating ROS and impairing antioxidant defenses in glioblastoma cells.
• This disruption contributes to the initiation and progression of inflammatory states within the tumor microenvironment.
• Prolonged NaF exposure may trigger adaptive responses in U-87 glioblastoma cells.