Testosterone-TGF-β crosstalk modulates cell migration in human glioblastoma-derived cell lines

Area of Science:

• Neuroscience
• Oncology
• Endocrinology

Background:

• Glioblastoma (GB) is an aggressive brain tumor characterized by significant cellular migration.
• Testosterone (T) and transforming growth factor-β (TGF-β) are known regulators of GB cell migration, but their interaction is not fully understood.

Purpose of the Study:

• To investigate whether testosterone modulates TGF-β signaling pathways to influence cell migration in human glioblastoma-derived cell lines.
• To identify potential androgen response elements (AREs) in the TGF-β gene.

Main Methods:

• In-silico identification of AREs within the TGF-β gene.
• Evaluation of T's effects on TGF-β secretion (ELISA) and SMAD signaling activation (Western blot) in U251 and T98G cells.
• Assessment of cell migration using scratch assays with and without the TGF-β pathway inhibitor SB431542.

Main Results:

• Seven AREs were identified in the TGF-β gene.
• Testosterone significantly increased TGF-β secretion and SMAD activation in U251 cells, but not in T98G cells.
• Inhibition of TGF-β signaling abrogated testosterone-stimulated migration solely in U251 cells.

Conclusions:

• Testosterone activates TGF-β signaling to promote glioblastoma cell migration in a cell-line specific manner (U251 cells).
• This study reveals heterogeneity in glioblastoma cell response to hormonal stimuli, impacting therapeutic strategies.