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Updated: May 9, 2026
Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
Published on: August 16, 2018
Distinctive GABA A receptor subunit expression modulates cell specific EMT and functional responses in glioblastoma
Maryam Khodaei1, Narges Hosseinmardi2,3, Majid Sirati-Sabet1
1Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Abstract:
Given the emerging understanding of neurotransmitter involvement in cancer biology, GABA receptors have garnered attention for their diverse and sometimes controversial roles across cancer types. Hence, this study aimed to investigate the expression patterns of GABA-A receptors in glioblastoma, breast, and ovarian cancer cells and their impact on cellular responses via an agonist‒antagonist approach. Cell proliferation and cytotoxicity were assessed using MTT and AO/PI assays, respectively. GABA treatment significantly influenced proliferation, stimulating it in ovarian A2780CP cells overexpressing GABRG3 and inhibiting it in U87 glioblastoma cells, which showed increased expression of GABRR3. Furthermore, GABA reduced CD133+ and CD44+ stem-like populations in A2780CP cells and decreased the CD44+ fraction in MDA-MB231 cells, correlating with specific GABA-A receptor subunit expression. Migration assays revealed that GABA significantly reduced the motility of MDA-MB231 and MCF-7 cells, possibly through modulation of GABRR2 expression. EMT-related transcription factors and markers were evaluated using qPCR, flow cytometry, and Western blot analysis. Protein-level changes in EMT markers confirmed the transcriptional data, with GABA modulating E-cadherin and Vimentin expression in a cell-specific manner. These findings underscore the critical role of GABA-A receptor subtypes in promoting or suppressing cancer progression through context-dependent regulation of proliferation, stemness, migration, and EMT.
Insights
Gamma-aminobutyric acid (GABA) receptors influence cancer progression. This study shows GABA impacts glioblastoma, breast, and ovarian cancer cell proliferation, stemness, and migration by modulating specific GABA-A receptor subunits.
Area of Science:
- Neuroscience
- Oncology
- Molecular Biology
Background:
- Neurotransmitters, including GABA, play emerging roles in cancer biology.
- GABA receptors exhibit diverse and context-dependent functions across various cancer types.
- Understanding GABA receptor subtypes in cancer is crucial for therapeutic targeting.
Purpose of the Study:
- Investigate GABA-A receptor expression patterns in glioblastoma, breast, and ovarian cancer cells.
- Determine the impact of GABA on cancer cell proliferation, stemness, migration, and epithelial-mesenchymal transition (EMT).
- Explore the correlation between GABA receptor subunit expression and cellular responses.
Main Methods:
- Cell proliferation and cytotoxicity assays (MTT, AO/PI).
- Flow cytometry to assess stem-like populations (CD133+, CD44+).
- Migration assays, qPCR, and Western blot analysis for EMT markers.
Main Results:
- GABA differentially affected proliferation, stimulating ovarian cancer cells and inhibiting glioblastoma cells.
- GABA reduced stem-like cell populations in ovarian and breast cancer cells.
- GABA inhibited migration in breast cancer cells and modulated EMT markers (E-cadherin, Vimentin) in a cell-specific manner.
Conclusions:
- GABA-A receptor subtypes critically regulate cancer progression.
- GABA's effects on proliferation, stemness, migration, and EMT are context-dependent.
- Findings highlight GABA receptors as potential targets in glioblastoma, breast, and ovarian cancers.
