GABA-A receptor anion channels

evidence_span

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experimental_model

Subunit expression and phenotype in primary lung macrophages and a macrophage cell line under polarising conditions

exposure

Classical and alternative activating conditions, with GABA-A receptor activation or blockade

limitations

Expression changes and phenotype rather than disease outcome. It shows the receptor tracks polarisation rather than that it drives it.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Mouse

plain_language

The receptor goes up as the cell takes the repair-type phenotype and down as it takes the inflammatory one.

primary_references

[gb-p30017085] Autocrine GABA signaling distinctively regulates phenotypic activation of mouse pulmonary macrophages. (2018). https://pubmed.ncbi.nlm.nih.gov/30017085/ DOI: 10.1016/j.cellimm.2018.07.001

tissue_or_cell_type

Lung macrophage

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 573–584

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Subunit expression and phenotype in primary lung macrophages and a macrophage cell line under polarising conditions · source_derived_draft · unverified_draft

### gb-the-receptor-tracks-polarisation GABA-A receptor subunits were expressed by primary lung macrophages of mice and the mouse macrophage cell line RAW264.7, the expression levels of these subunits decreased or increased concurrently with classical M1 or alternative M2 activation respectively, moreover activation or blockade of the receptors distinctively influenced the phenotypic characteristics of the macrophages, and these results suggested that microenvironments leading to macrophage phenotypic polarization concurrently modulate autocrine GABA signaling and its role in macrophage activation. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: The receptor goes up as the cell takes the repair-type phenotype and down as it takes the inflammatory one. organism: Mouse tissue_or_cell_type: Lung macrophage experimental_model: Subunit expression and phenotype in primary lung macrophages and a macrophage cell line under polarising conditions limitations: Expression changes and phenotype rather than disease outcome. It shows the receptor tracks polarisation rather than that it drives it. exposure: Classical and alternative activating conditions, with GABA-A receptor activation or blockade evidence_span: {"source_cache": "artifacts/gaba-research/30017085.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c2d49008808726bf766218eb51ab5ec08e9790897619e750b8caacc1afad63b", "start_char": 0, "end_char": 1120, "text_sha256": "8c2d49008808726bf766218eb51ab5ec08e9790897619e750b8caacc1afad63b"} [gb-p30017085] Autocrine GABA signaling distinctively regulates phenotypic activation of mouse pulmonary macrophages. (2018). https://pubmed.ncbi.nlm.nih.gov/30017085/ DOI: 10.1016/j.cellimm.2018.07.001

evidence_span

{"source_cache": "artifacts/gaba-research/22927941.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "0457001832d2a3595899415221b7797f5288a787c1d52fd6afa1acf24f032402", "start_char": 0, "end_char": 1589, "text_sha256": "0457001832d2a3595899415221b7797f5288a787c1d52fd6afa1acf24f032402"}

experimental_model

Subunit isoform survey with immunoblotting, immunocytochemistry and whole-cell recording across three species

exposure

GABA-activated transient and tonic currents, with picrotoxin, SR95531 and bicuculline

limitations

The species comparison is the point. Subunit repertoires differ enough that a drug result in one species does not carry to another.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Human, mouse and rat

plain_language

The subunit that makes a receptor respond to benzodiazepines was found on mouse T cells and not on human ones.

primary_references

[gb-p22927941] Different subtypes of GABA-A receptors are expressed in human, mouse and rat T lymphocytes. (2012). https://pubmed.ncbi.nlm.nih.gov/22927941/ DOI: 10.1371/journal.pone.0042959

tissue_or_cell_type

CD4 and CD8 T lymphocytes

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 521–532

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Subunit isoform survey with immunoblotting, immunocytochemistry and whole-cell recording across three species · source_derived_draft · unverified_draft

### gb-the-subunits-differ-by-species There were 5, 8 and 13 different GABA-A subunit isoforms identified in human, mouse and rat CD4-positive and CD8-positive T cells respectively, importantly the gamma2 subunit that imposes benzodiazepine sensitivity on the GABA-A receptors was only detected in the mouse T cells, immunoblots and immunocytochemistry showed abundant GABA-A channel proteins in T cells from all three species, GABA-activated whole-cell transient and tonic currents were recorded and were inhibited by picrotoxin, SR95531 and bicuculline, and it is important to bear in mind the interspecies difference when selecting the appropriate animal models and when selecting drugs aimed at modulating human T cell function. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: The subunit that makes a receptor respond to benzodiazepines was found on mouse T cells and not on human ones. organism: Human, mouse and rat tissue_or_cell_type: CD4 and CD8 T lymphocytes experimental_model: Subunit isoform survey with immunoblotting, immunocytochemistry and whole-cell recording across three species limitations: The species comparison is the point. Subunit repertoires differ enough that a drug result in one species does not carry to another. exposure: GABA-activated transient and tonic currents, with picrotoxin, SR95531 and bicuculline evidence_span: {"source_cache": "artifacts/gaba-research/22927941.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "0457001832d2a3595899415221b7797f5288a787c1d52fd6afa1acf24f032402", "start_char": 0, "end_char": 1589, "text_sha256": "0457001832d2a3595899415221b7797f5288a787c1d52fd6afa1acf24f032402"} [gb-p22927941] Different subtypes of GABA-A receptors are expressed in human, mouse and rat T lymphocytes. (2012). https://pubmed.ncbi.nlm.nih.gov/22927941/ DOI: 10.1371/journal.pone.0042959

evidence_span

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experimental_model

Two multicentre double-blind randomised placebo-controlled trials of a 60-hour intravenous infusion

exposure

Brexanolone, an intravenous formulation of the endogenous neurosteroid allopregnanolone, in severe and moderate postpartum depression

limitations

Two randomised trials with a depression rating scale as the endpoint over 60 hours of infusion, in a hospital setting.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Human

plain_language

An infusion of the body own calming steroid lifted depression scores within sixty hours.

primary_references

[gb-p30177236] Brexanolone injection in post-partum depression: two multicentre, double-blind, randomised, placebo-controlled, phase 3 trials. (2018). https://pubmed.ncbi.nlm.nih.gov/30177236/ DOI: 10.1016/s0140-6736(18)31551-4

tissue_or_cell_type

Central nervous system

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 313–324

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Two multicentre double-blind randomised placebo-controlled trials of a 60-hour intravenous infusion · source_derived_draft · unverified_draft

### gb-a-neurosteroid-works-in-postpartum-depression In two multicentre double-blind randomised placebo-controlled phase 3 trials of brexanolone injection in women with post-partum depression, the least-squares mean reduction in Hamilton Rating Scale for Depression total score at 60 hours was significantly greater with brexanolone than with placebo, the treatment was generally well tolerated and the most common adverse events included headache, dizziness and somnolence, with sedation-related events leading to dose interruption or reduction in a small number of patients. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: An infusion of the body own calming steroid lifted depression scores within sixty hours. organism: Human tissue_or_cell_type: Central nervous system experimental_model: Two multicentre double-blind randomised placebo-controlled trials of a 60-hour intravenous infusion limitations: Two randomised trials with a depression rating scale as the endpoint over 60 hours of infusion, in a hospital setting. exposure: Brexanolone, an intravenous formulation of the endogenous neurosteroid allopregnanolone, in severe and moderate postpartum depression evidence_span: {"source_cache": "artifacts/gaba-research/30177236.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e1fe6320cb8a13ea913662a0f648ef919eecbeeb47c742242c58ed4a342b2ceb", "start_char": 0, "end_char": 4369, "text_sha256": "e1fe6320cb8a13ea913662a0f648ef919eecbeeb47c742242c58ed4a342b2ceb"} [gb-p30177236] Brexanolone injection in post-partum depression: two multicentre, double-blind, randomised, placebo-controlled, phase 3 trials. (2018). https://pubmed.ncbi.nlm.nih.gov/30177236/ DOI: 10.1016/s0140-6736(18)31551-4

evidence_span

{"source_cache": "artifacts/gaba-research/30305619.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4d53b15743f61b910fb1db4781905673c81a070c12245068a369548544e3bc6e", "start_char": 0, "end_char": 1146, "text_sha256": "4d53b15743f61b910fb1db4781905673c81a070c12245068a369548544e3bc6e"}

experimental_model

Autophagy and phagosome assays in macrophages with receptor and protein dependency, and infection burden in two whole animals

exposure

GABA and GABAergic drugs during intracellular mycobacterial infection, with GABAergic inhibition in vivo

limitations

The dependency on the receptor and on a specific autophagy protein is tested, and the outcome is measured in two species. The direction is the opposite of the autoimmunity records.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Mouse and zebrafish

plain_language

Here the same molecule helps rather than suppresses: it drives the cell to digest the bacteria inside it, and blocking it lets the infection grow.

primary_references

[gb-p30305619] GABAergic signaling linked to autophagy enhances host protection against intracellular bacterial infections. (2018). https://pubmed.ncbi.nlm.nih.gov/30305619/ DOI: 10.1038/s41467-018-06487-5

tissue_or_cell_type

Macrophage

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 586–597

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Autophagy and phagosome assays in macrophages with receptor and protein dependency, and infection burden in two whole animals · source_derived_draft · unverified_draft

### gb-gaba-helps-the-host-kill-bacteria Intracellular bacterial infection decreases GABA levels in vitro in macrophages and in vivo in sera, treatment of macrophages with GABA or GABAergic drugs promotes autophagy activation, enhances phagosomal maturation and antimicrobial responses against mycobacterial infection, in macrophages the GABAergic defense is mediated via macrophage type A GABA receptor, intracellular calcium release and the GABA type A receptor-associated protein-like 1, and GABAergic inhibition increases bacterial loads in mice and zebrafish in vivo suggesting that the GABAergic defense plays an essential function in metazoan host defenses. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: Here the same molecule helps rather than suppresses: it drives the cell to digest the bacteria inside it, and blocking it lets the infection grow. organism: Mouse and zebrafish tissue_or_cell_type: Macrophage experimental_model: Autophagy and phagosome assays in macrophages with receptor and protein dependency, and infection burden in two whole animals limitations: The dependency on the receptor and on a specific autophagy protein is tested, and the outcome is measured in two species. The direction is the opposite of the autoimmunity records. exposure: GABA and GABAergic drugs during intracellular mycobacterial infection, with GABAergic inhibition in vivo evidence_span: {"source_cache": "artifacts/gaba-research/30305619.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4d53b15743f61b910fb1db4781905673c81a070c12245068a369548544e3bc6e", "start_char": 0, "end_char": 1146, "text_sha256": "4d53b15743f61b910fb1db4781905673c81a070c12245068a369548544e3bc6e"} [gb-p30305619] GABAergic signaling linked to autophagy enhances host protection against intracellular bacterial infections. (2018). https://pubmed.ncbi.nlm.nih.gov/30305619/ DOI: 10.1038/s41467-018-06487-5

evidence_span

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experimental_model

Demonstration of GABA synthesis and catabolism machinery in immune cells with electrophysiology and an autoimmune disease model

exposure

Increasing GABAergic activity in established experimental autoimmune encephalomyelitis

limitations

The disease effect is on ongoing paralysis rather than prevention. The assignment to antigen-presenting cells rests on direct effects measured on those cells.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Mouse

plain_language

The immune system has the whole apparatus to make and break down this transmitter, and uses it on itself.

primary_references

[gb-p20133656] Inhibitory role for GABA in autoimmune inflammation. (2010). https://pubmed.ncbi.nlm.nih.gov/20133656/ DOI: 10.1073/pnas.0915139107

tissue_or_cell_type

Antigen-presenting cell and central nervous system

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 547–558

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Demonstration of GABA synthesis and catabolism machinery in immune cells with electrophysiology and an autoimmune disease model · source_derived_draft · unverified_draft

### gb-immune-cells-make-their-own-gaba Immune cells synthesize GABA and have the machinery for GABA catabolism, antigen-presenting cells express functional GABA receptors and respond electrophysiologically to GABA, thus the immune system harbors all of the necessary constituents for GABA signaling and GABA itself may function as a paracrine or autocrine factor, increasing GABAergic activity ameliorates ongoing paralysis in experimental autoimmune encephalomyelitis via inhibition of inflammation, and GABAergic agents act directly on antigen-presenting cells decreasing MAPK signals and diminishing subsequent adaptive inflammatory responses to myelin proteins. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: The immune system has the whole apparatus to make and break down this transmitter, and uses it on itself. organism: Mouse tissue_or_cell_type: Antigen-presenting cell and central nervous system experimental_model: Demonstration of GABA synthesis and catabolism machinery in immune cells with electrophysiology and an autoimmune disease model limitations: The disease effect is on ongoing paralysis rather than prevention. The assignment to antigen-presenting cells rests on direct effects measured on those cells. exposure: Increasing GABAergic activity in established experimental autoimmune encephalomyelitis evidence_span: {"source_cache": "artifacts/gaba-research/20133656.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "15fc62882eb9a9c1f5daad1bd2845bc99c94f1cf076620badc55b6be390e35fd", "start_char": 0, "end_char": 896, "text_sha256": "15fc62882eb9a9c1f5daad1bd2845bc99c94f1cf076620badc55b6be390e35fd"} [gb-p20133656] Inhibitory role for GABA in autoimmune inflammation. (2010). https://pubmed.ncbi.nlm.nih.gov/20133656/ DOI: 10.1073/pnas.0915139107

evidence_span

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experimental_model

Knock-in mice carrying a point mutation that removes benzodiazepine sensitivity from one subunit

exposure

A histidine-to-arginine point mutation at position 101 of the alpha-1 subunit, with diazepam

limitations

A single-residue knock-in that separates drug actions by subunit. GABA regulation of the mutated receptor is preserved, which is what makes the dissociation clean.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Mouse

plain_language

Change one amino acid and the same drug stops sedating the animal while still calming it, because different effects run through different subunits.

primary_references

[gb-p10548105] Benzodiazepine actions mediated by specific gamma-aminobutyric acid(A) receptor subtypes. (1999). https://pubmed.ncbi.nlm.nih.gov/10548105/ DOI: 10.1038/44579

tissue_or_cell_type

Cortex, thalamus and limbic system

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 235–246

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Knock-in mice carrying a point mutation that removes benzodiazepine sensitivity from one subunit · source_derived_draft · unverified_draft

### gb-one-subunit-carries-the-sedation By introducing a histidine-to-arginine point mutation at position 101 of the murine alpha1-subunit gene, alpha1-type GABA-A receptors which are mainly expressed in cortical areas and thalamus are rendered insensitive to allosteric modulation by benzodiazepine-site ligands whilst regulation by the physiological neurotransmitter GABA is preserved, alpha1(H101R) mice failed to show the sedative, amnesic and partly the anticonvulsant action of diazepam, in contrast the anxiolytic-like, myorelaxant, motor-impairing and ethanol-potentiating effects were fully retained and are attributed to the nonmutated receptors found in the limbic system, in monoaminergic neurons and in motoneurons. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: Change one amino acid and the same drug stops sedating the animal while still calming it, because different effects run through different subunits. organism: Mouse tissue_or_cell_type: Cortex, thalamus and limbic system experimental_model: Knock-in mice carrying a point mutation that removes benzodiazepine sensitivity from one subunit limitations: A single-residue knock-in that separates drug actions by subunit. GABA regulation of the mutated receptor is preserved, which is what makes the dissociation clean. exposure: A histidine-to-arginine point mutation at position 101 of the alpha-1 subunit, with diazepam evidence_span: {"source_cache": "artifacts/gaba-research/10548105.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "73f8793d4606905cc7330c56b3345629a48e652c824f1dfecc9c4670c3c9b74b", "start_char": 0, "end_char": 1270, "text_sha256": "73f8793d4606905cc7330c56b3345629a48e652c824f1dfecc9c4670c3c9b74b"} [gb-p10548105] Benzodiazepine actions mediated by specific gamma-aminobutyric acid(A) receptor subtypes. (1999). https://pubmed.ncbi.nlm.nih.gov/10548105/ DOI: 10.1038/44579

evidence_span

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experimental_model

Voltage clamp electrophysiology of a sensitising channel mutant with a loss of righting reflex assay and comparative molecular field analysis

exposure

A series of etomidate analogs spanning a 91-fold range of receptor potency

limitations

Recombinant receptors carrying a mutation that enhances anaesthetic sensitivity, paired with an animal endpoint. The correlation is across analogs rather than within one drug.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Rat and recombinant receptor

plain_language

How well these anaesthetics work tracks their exact shape at a binding site and not at all how greasy they are.

primary_references

[gb-p26691905] γ-Aminobutyric Acid Type A Receptor Modulation by Etomidate Analogs. (2016). https://pubmed.ncbi.nlm.nih.gov/26691905/ DOI: 10.1097/aln.0000000000000992

tissue_or_cell_type

Recombinant alpha1beta3gamma2 receptors and whole animals

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 248–259

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Voltage clamp electrophysiology of a sensitising channel mutant with a loss of righting reflex assay and comparative molecular field analysis · source_derived_draft · unverified_draft

### gb-potency-is-structural-not-greasy The GABA-A receptor and hypnotic potencies of etomidate and the etomidate analogs ranged by 91-fold and 53-fold respectively, these potency measurements were significantly correlated with r = 0.72, but neither measurement correlated with drug hydrophobicity with r = 0.019 and 0.005 respectively, statistically significant and predictive comparative molecular field analysis models were generated, and a pharmacophore model was built revealing both the structural elements associated with high potency and the interactions that these elements make with the etomidate-binding site. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: How well these anaesthetics work tracks their exact shape at a binding site and not at all how greasy they are. organism: Rat and recombinant receptor tissue_or_cell_type: Recombinant alpha1beta3gamma2 receptors and whole animals experimental_model: Voltage clamp electrophysiology of a sensitising channel mutant with a loss of righting reflex assay and comparative molecular field analysis limitations: Recombinant receptors carrying a mutation that enhances anaesthetic sensitivity, paired with an animal endpoint. The correlation is across analogs rather than within one drug. exposure: A series of etomidate analogs spanning a 91-fold range of receptor potency evidence_span: {"source_cache": "artifacts/gaba-research/26691905.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1143ce4efd922ff301b6a1ca54f0a84b8ffe08bf53946b8fcee1f3ad17a8b7eb", "start_char": 0, "end_char": 1844, "text_sha256": "1143ce4efd922ff301b6a1ca54f0a84b8ffe08bf53946b8fcee1f3ad17a8b7eb"} [gb-p26691905] γ-Aminobutyric Acid Type A Receptor Modulation by Etomidate Analogs. (2016). https://pubmed.ncbi.nlm.nih.gov/26691905/ DOI: 10.1097/aln.0000000000000992

evidence_span

{"source_cache": "artifacts/gaba-research/2550826.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9062539804213a1ccf427b75c8f6d262b151e22464cd6b7c84640f222f7dea94", "start_char": 0, "end_char": 1225, "text_sha256": "9062539804213a1ccf427b75c8f6d262b151e22464cd6b7c84640f222f7dea94"}

experimental_model

Electrophysiology of pancreatic alpha 2 cells with glucose and GABA

exposure

GABA co-secreted with insulin from beta cells, acting on GABA-A receptor chloride channels in alpha 2 cells

limitations

An early electrophysiological model. It proposes that GABA mediates part of the effect of glucose rather than demonstrating the whole of it.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Guinea pig and rat

plain_language

The cells that release insulin release GABA with it, and that is part of how a meal switches off the opposing hormone.

primary_references

[gb-p2550826] Glucose-inhibition of glucagon secretion involves activation of GABAA-receptor chloride channels. (1989). https://pubmed.ncbi.nlm.nih.gov/2550826/ DOI: 10.1038/341233a0

tissue_or_cell_type

Pancreatic islet

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 404–415

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Electrophysiology of pancreatic alpha 2 cells with glucose and GABA · source_derived_draft · unverified_draft

### gb-the-islet-signals-with-gaba The inhibitory neurotransmitter GABA is present in the endocrine part of the pancreas at concentrations comparable to those encountered in the central nervous system and co-localizes with insulin in pancreatic beta cells, and we describe a mechanism whereby GABA co-secreted with insulin from beta cells may mediate part of the inhibitory action of glucose on glucagon secretion by activating GABA-A receptor chloride channels in alpha 2 cells, providing a model for feedback regulation of glucagon release which may be of significance for understanding the hypersecretion of glucagon frequently associated with diabetes. Condition category: normal nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: The cells that release insulin release GABA with it, and that is part of how a meal switches off the opposing hormone. organism: Guinea pig and rat tissue_or_cell_type: Pancreatic islet experimental_model: Electrophysiology of pancreatic alpha 2 cells with glucose and GABA limitations: An early electrophysiological model. It proposes that GABA mediates part of the effect of glucose rather than demonstrating the whole of it. exposure: GABA co-secreted with insulin from beta cells, acting on GABA-A receptor chloride channels in alpha 2 cells evidence_span: {"source_cache": "artifacts/gaba-research/2550826.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9062539804213a1ccf427b75c8f6d262b151e22464cd6b7c84640f222f7dea94", "start_char": 0, "end_char": 1225, "text_sha256": "9062539804213a1ccf427b75c8f6d262b151e22464cd6b7c84640f222f7dea94"} [gb-p2550826] Glucose-inhibition of glucagon secretion involves activation of GABAA-receptor chloride channels. (1989). https://pubmed.ncbi.nlm.nih.gov/2550826/ DOI: 10.1038/341233a0

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_span

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experimental_model

Developmental comparison of GABA-A responses with antisense inhibition of the transporter

exposure

Antisense oligonucleotide inhibition of KCC2 expression in functionally mature neurons

limitations

Rat hippocampal neurons. It establishes which transporter sets the gradient; it does not address other cell types.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Rat

plain_language

The same receptor flips from exciting to inhibiting as the cell learns to pump chloride out, and knocking the pump down flips it back.

primary_references

[gb-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697

tissue_or_cell_type

Hippocampal pyramidal neuron

trigger_kind

machinery_impairment Imported condition classification; unverified.

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 196–207

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Developmental comparison of GABA-A responses with antisense inhibition of the transporter · source_derived_draft · unverified_draft

### gb-the-transporter-sets-the-sign GABA is the main inhibitory transmitter in the adult brain and exerts its fast hyperpolarizing effect through activation of anion-permeant GABA-A receptors, however during early neuronal development GABA-A-receptor-mediated responses are often depolarizing, in pyramidal neurons of the rat hippocampus the ontogenetic change in GABA-A-mediated responses from depolarizing to hyperpolarizing is coupled to a developmental induction of the expression of the neuronal chloride-extruding potassium-chloride co-transporter KCC2, and antisense oligonucleotide inhibition of KCC2 expression produces a marked positive shift in the reversal potential of GABA-A responses in functionally mature hippocampal pyramidal neurons. Condition category: machinery_impairment nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: The same receptor flips from exciting to inhibiting as the cell learns to pump chloride out, and knocking the pump down flips it back. organism: Rat tissue_or_cell_type: Hippocampal pyramidal neuron experimental_model: Developmental comparison of GABA-A responses with antisense inhibition of the transporter limitations: Rat hippocampal neurons. It establishes which transporter sets the gradient; it does not address other cell types. exposure: Antisense oligonucleotide inhibition of KCC2 expression in functionally mature neurons evidence_span: {"source_cache": "artifacts/gaba-research/9930699.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6", "start_char": 0, "end_char": 1181, "text_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6"} [gb-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697

evidence_span

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experimental_model

Developmental expression and antisense suppression

exposure

KCC2 expression during maturation; antisense inhibition

limitations

Neuronal gradient mechanism; dietary chloride restriction is not the intervention.

nutrient_topic

Chloride research collection; topical membership is not evidence of a direct dietary effect. · Chloride

organism

Rat

plain_language

Potassium-coupled chloride removal helps mature neurons respond to GABA with inhibition.

primary_references

[chloride-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697

tissue_or_cell_type

Hippocampal pyramidal neurons

Chloride: transport, acid-base balance, nutrient interactions and loss states (2026-09-17) · lines 393–404

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Developmental expression and antisense suppression · source_derived_draft · unverified_draft

### chloride-kcc2-cl-extrusion Developmental KCC2 expression accompanied the shift toward hyperpolarizing GABA-A responses. Condition category: normal nutrient_topic: Chloride research collection; topical membership is not evidence of a direct dietary effect. plain_language: Potassium-coupled chloride removal helps mature neurons respond to GABA with inhibition. organism: Rat tissue_or_cell_type: Hippocampal pyramidal neurons experimental_model: Developmental expression and antisense suppression limitations: Neuronal gradient mechanism; dietary chloride restriction is not the intervention. exposure: KCC2 expression during maturation; antisense inhibition evidence_span: {"source_cache": "artifacts/chloride-research/9930699.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6", "start_char": 0, "end_char": 1181, "text_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6"} [chloride-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_span

{"source_cache": "artifacts/chloride-research/9930699.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6", "start_char": 0, "end_char": 1181, "text_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6"}

experimental_model

Developmental expression and antisense suppression

exposure

KCC2 expression during maturation; antisense inhibition

limitations

Neuronal gradient mechanism; dietary chloride restriction is not the intervention.

nutrient_topic

Chloride research collection; topical membership is not evidence of a direct dietary effect. · Chloride

organism

Rat

plain_language

GABA’s electrical effect depends on the chloride gradient maintained by the cell.

primary_references

[chloride-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697

tissue_or_cell_type

Hippocampal pyramidal neurons

trigger_kind

machinery_impairment Imported condition classification; unverified.

Chloride: transport, acid-base balance, nutrient interactions and loss states (2026-09-17) · lines 406–417

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Developmental expression and antisense suppression · source_derived_draft · unverified_draft

### chloride-kcc2-gaba-loss Suppressing KCC2 shifted the GABA-A reversal potential in a positive direction in mature neurons. Condition category: machinery_impairment nutrient_topic: Chloride research collection; topical membership is not evidence of a direct dietary effect. plain_language: GABA’s electrical effect depends on the chloride gradient maintained by the cell. organism: Rat tissue_or_cell_type: Hippocampal pyramidal neurons experimental_model: Developmental expression and antisense suppression limitations: Neuronal gradient mechanism; dietary chloride restriction is not the intervention. exposure: KCC2 expression during maturation; antisense inhibition evidence_span: {"source_cache": "artifacts/chloride-research/9930699.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6", "start_char": 0, "end_char": 1181, "text_sha256": "2ef63b1f73a7a33ae3fc709c3ace45a585604d86f9fe1bce8c83405d21cdcaa6"} [chloride-p9930699] The K+/Cl- co-transporter KCC2 renders GABA hyperpolarizing during neuronal maturation. (1999). https://pubmed.ncbi.nlm.nih.gov/9930699/ DOI: 10.1038/16697