Gamma-aminobutyric acid treatment reduces estradiol-stimulated breast cancer cell growth and estradiol-induced breast tumorigenesis

Abstract

Gamma-aminobutyric acid (GABA) is a non-protein amino acid and contained in various foods, such as fruits and vegetables. Although various health benefits of GABA have been reported, GABA seems to have unidentified functions. In this study, we first show increase in intracellular GABA level in GABA-treated breast cancer cell lines, MCF-7 and T-47D, in amino acid analyses and immunofluorescence. In our experimental condition, GABA treatment reduced estradiol-stimulated cell growth in these cell lines. In addition, we performed mouse early breast cancer induction model system to investigate GABA function in mammary dysplasia formation. In the results, GABA administration reduced dysplasia formation, suggesting that GABA prevents breast tumorigenesis. This study demonstrates a novel function of GABA to maintain normal breast tissues.