GABA (Gamma Aminobutyric Acid)

Overview

Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system. In the WikiBiome context, GABA is notable because gut bacteria produce it — certain Lactobacillus and Bifidobacterium species possess glutamate decarboxylase (GAD) enzymes that convert dietary glutamate to GABA. This microbial GABA production links the gut brain axis to anxiety, depression, PMDD, and schizophrenia.

Microbial GABA Production

  • lactobacillus reuteri, L. brevis, and bifidobacterium species are the primary GABA-producing gut bacteria.
  • Microbial GABA acts locally on enteric neurons (vagal afferents) and may contribute to circulating GABA levels.
  • Dysbiosis-driven loss of GABA-producing commensals is associated with anxiety and depressive phenotypes [1].

Disease Associations

  • PMDD/PMS: GABAergic deficiency implicated in premenstrual mood dysregulation; allopregnanolone (a GABA-A receptor modulator) is central to PMDD pathophysiology [2] [3] [4].
  • Schizophrenia: Altered GABA levels and GABAergic signaling in schizophrenia gut-brain axis [5] [6].
  • MS: Dietary interventions targeting GABA pathways in multiple sclerosis [7].

Cross-References

References (8)

  1. Eskandar K (2025). The Gut-Brain Axis in Depression, Anxiety, and Schizophrenia: A Scoping Review of Mechanisms, Biomarkers, and Therapeutic Implications. Middle East Current Psychiatry. doi:10.1186/s43045-025-00585-z
  2. Khalida Itriyeva (2022). Itriyeva 2022 — PMS and PMDD in Adolescents (Review). Current Problems in Pediatric and Adolescent Health Care. doi:10.1016/j.cppeds.2022.101187
  3. Cheng et al. (2025). Cheng 2025 — Neuroinflammation in PMS and PMDD (Review). Frontiers in Endocrinology. doi:10.3389/fendo.2025.1561848
  4. Adile Nexha, Luisa Caropreso, Taiane de Azevedo Cardoso et al. (2024). Nexha 2024 — Biological Rhythms in PMS/PMDD (Systematic Review). BMC Women's Health. doi:10.1186/s12905-024-03395-3
  5. Ghorbani M, Joseph GBS, Tew MM et al. (2024). Functional Associations of the Gut Microbiome with Dopamine, Serotonin, and BDNF in Schizophrenia: A Pilot Study. Egyptian Journal of Neurology, Psychiatry and Neurosurgery. doi:10.1186/s41983-024-00901-0
  6. Li S, Song J, Ke P et al. (2021). The Gut Microbiome is Associated with Brain Structure and Function in Schizophrenia. Scientific Reports. doi:10.1038/s41598-021-89166-8
  7. Atabilen B, Akdevelioglu Y (2022). Effects of Different Dietary Interventions in Multiple Sclerosis: A Systematic Review of Evidence from 2018 to 2022. Nutritional Neuroscience. doi:10.1080/1028415X.2022.2146843
  8. Yimin Han, Boya Wang, Han Gao et al. (2022). Han et al. 2022 — Vagus Nerve and Underlying Impact on the Gut Microbiota-Brain Axis in Behavior and Neurodegenerative Diseases. Journal of Inflammation Research. doi:10.2147/JIR.S384949

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