The role of gamma-aminobutyric acid in female depression

Abstract

Depression is a common psychiatric disorder and a leading cause of disability worldwide. Multiple and diverse factors are involved in its cause although biologic factors are prominent. The present study reviews the evidence about the role that gamma-aminobutyric acid plays in the complex pathogenesis of depression, particularly in women. The implication of gamma-aminobutyric acid (GABA) is based mainly from animal models whereas clinical studies in depressed patients show alterations of GABA levels in plasma and cerebrospinal fluid. Neuroimaging studies using spectroscopy indicate also decreased GABA levels in different brain areas which in turn may normalize after antidepressant therapy, and these findings translate into clinical response. It has been observed that depression has a higher prevalence among women which suggests a link between depression and hormonal changes. Similarly, gonadal hormones have a regulatory effect on the hypothalamic–pituitary–adrenal axis through GABA receptors making women more vulnerable to suffer stress and depression. Therefore, the implication of GABA in the neurobiology of depression should be explored in order to search for new therapeutic strategies.