Component

The reversal potential of anion currents

The reversal potential of anion currents. Species, exposure and limitations are retained in each linked claim.

3 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What acts on it

  1. ATP-stimulated microglia cause a depolarizing shift in the anion reversal potential in spinal lamina I neurons which inverts the polarity of currents activated by GABA as occurs after peripheral nerve injury, applying brain-derived neurotrophic factor mimics the alteration, blocking signalling between BDNF and the receptor TrkB reverses the allodynia and the shift that follows both nerve injury and administration of ATP-stimulated microglia, and preventing BDNF release from microglia by pretreating them with interfering RNA before ATP stimulation also inhibits the effects on the withdrawal threshold.

    Brain-derived neurotrophic factor → The reversal potential of anion currents source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/gaba-research/16355225.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "75e8e0a216ad3cbd68087f650d263b38fe34b73a6b3b253b929b2af26434e001", "start_char": 0, "end_char": 1571, "text_sha256": "75e8e0a216ad3cbd68087f650d263b38fe34b73a6b3b253b929b2af26434e001"}
    experimental_model
    Recordings from lamina I neurons exposed to ATP-stimulated microglia, with BDNF blockade and interfering RNA
    exposure
    ATP-stimulated microglia, applied BDNF, BDNF-TrkB blockade, and interfering RNA against BDNF in microglia
    limitations
    Each link in the chain is cut separately, which is what makes the assignment to BDNF strong. It remains a rodent model of one pain state.
    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
    An immune cell in the spinal cord releases a growth factor that turns the brake into an accelerator.
    primary_references
    [gb-p16355225] BDNF from microglia causes the shift in neuronal anion gradient underlying neuropathic pain. (2005). https://pubmed.ncbi.nlm.nih.gov/16355225/ DOI: 10.1038/nature04223
    tissue_or_cell_type
    Spinal lamina I dorsal horn neuron and microglia
    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 222–233

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recordings from lamina I neurons exposed to ATP-stimulated microglia, with BDNF blockade and interfering RNA · source_derived_draft · unverified_draft

    ### gb-microglia-invert-the-current ATP-stimulated microglia cause a depolarizing shift in the anion reversal potential in spinal lamina I neurons which inverts the polarity of currents activated by GABA as occurs after peripheral nerve injury, applying brain-derived neurotrophic factor mimics the alteration, blocking signalling between BDNF and the receptor TrkB reverses the allodynia and the shift that follows both nerve injury and administration of ATP-stimulated microglia, and preventing BDNF release from microglia by pretreating them with interfering RNA before ATP stimulation also inhibits the effects on the withdrawal threshold. 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: An immune cell in the spinal cord releases a growth factor that turns the brake into an accelerator. organism: Rat tissue_or_cell_type: Spinal lamina I dorsal horn neuron and microglia experimental_model: Recordings from lamina I neurons exposed to ATP-stimulated microglia, with BDNF blockade and interfering RNA limitations: Each link in the chain is cut separately, which is what makes the assignment to BDNF strong. It remains a rodent model of one pain state. exposure: ATP-stimulated microglia, applied BDNF, BDNF-TrkB blockade, and interfering RNA against BDNF in microglia evidence_span: {"source_cache": "artifacts/gaba-research/16355225.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "75e8e0a216ad3cbd68087f650d263b38fe34b73a6b3b253b929b2af26434e001", "start_char": 0, "end_char": 1571, "text_sha256": "75e8e0a216ad3cbd68087f650d263b38fe34b73a6b3b253b929b2af26434e001"} [gb-p16355225] BDNF from microglia causes the shift in neuronal anion gradient underlying neuropathic pain. (2005). https://pubmed.ncbi.nlm.nih.gov/16355225/ DOI: 10.1038/nature04223
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Following peripheral nerve injury there is a trans-synaptic reduction in the expression of the potassium-chloride exporter KCC2 and consequent disruption of anion homeostasis in neurons of lamina I of the superficial dorsal horn, the resulting shift in the transmembrane anion gradient caused normally inhibitory anionic synaptic currents to be excitatory, substantially driving up the net excitability of lamina I neurons, and local blockade or knock-down of the spinal KCC2 exporter in intact rats markedly reduced the nociceptive threshold, confirming that the disruption of anion homeostasis was sufficient to cause neuropathic pain.

    Peripheral nerve injury → The neuronal potassium-chloride co-transporter KCC2 source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/gaba-research/12931188.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "f465ce014f8ada8e6018e23f0009197609a343241b8d0926b34ed186ce345fa4", "start_char": 0, "end_char": 1073, "text_sha256": "f465ce014f8ada8e6018e23f0009197609a343241b8d0926b34ed186ce345fa4"}
    experimental_model
    Recordings from lamina I neurons after peripheral nerve injury, with spinal blockade and knockdown in intact animals
    exposure
    Peripheral nerve injury, and local blockade or knock-down of spinal KCC2 in intact rats
    limitations
    The knockdown in intact animals is what makes this causal rather than correlative: reproducing the gradient change alone reproduced the pain phenotype.
    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
    After nerve injury the inhibitory synapses in the pain pathway start doing the opposite of inhibiting.
    primary_references
    [gb-p12931188] Trans-synaptic shift in anion gradient in spinal lamina I neurons as a mechanism of neuropathic pain. (2003). https://pubmed.ncbi.nlm.nih.gov/12931188/ DOI: 10.1038/nature01868
    tissue_or_cell_type
    Spinal lamina I dorsal horn 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 209–220

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recordings from lamina I neurons after peripheral nerve injury, with spinal blockade and knockdown in intact animals · source_derived_draft · unverified_draft

    ### gb-inhibition-becomes-excitation Following peripheral nerve injury there is a trans-synaptic reduction in the expression of the potassium-chloride exporter KCC2 and consequent disruption of anion homeostasis in neurons of lamina I of the superficial dorsal horn, the resulting shift in the transmembrane anion gradient caused normally inhibitory anionic synaptic currents to be excitatory, substantially driving up the net excitability of lamina I neurons, and local blockade or knock-down of the spinal KCC2 exporter in intact rats markedly reduced the nociceptive threshold, confirming that the disruption of anion homeostasis was sufficient to cause neuropathic pain. 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: After nerve injury the inhibitory synapses in the pain pathway start doing the opposite of inhibiting. organism: Rat tissue_or_cell_type: Spinal lamina I dorsal horn neuron experimental_model: Recordings from lamina I neurons after peripheral nerve injury, with spinal blockade and knockdown in intact animals limitations: The knockdown in intact animals is what makes this causal rather than correlative: reproducing the gradient change alone reproduced the pain phenotype. exposure: Peripheral nerve injury, and local blockade or knock-down of spinal KCC2 in intact rats evidence_span: {"source_cache": "artifacts/gaba-research/12931188.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "f465ce014f8ada8e6018e23f0009197609a343241b8d0926b34ed186ce345fa4", "start_char": 0, "end_char": 1073, "text_sha256": "f465ce014f8ada8e6018e23f0009197609a343241b8d0926b34ed186ce345fa4"} [gb-p12931188] Trans-synaptic shift in anion gradient in spinal lamina I neurons as a mechanism of neuropathic pain. (2003). https://pubmed.ncbi.nlm.nih.gov/12931188/ DOI: 10.1038/nature01868
    Complete structured claim and evidence

  2. 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.

    The neuronal potassium-chloride co-transporter KCC2 → Whether a GABA-A response hyperpolarises or depolarises the cell source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    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"}
    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
    Complete structured claim and evidence

In the sources

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    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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