Brain capillary endothelial cells: molecular mechanisms & dependencies

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.

Human evidence only

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

Where it participates (unsigned role)

GABA transport was studied by cellular uptake of tritiated GABA which was sodium-, chloride- and concentration-dependent with a Michaelis-Menten constant of 679 plus or minus 80 micromol per litre and a maximal uptake rate of 4,790 pmol per milligram protein per 5 minutes, uptake was significantly inhibited by betaine, beta-alanine, nipecotic acid, taurine and quinidine whereas probenecid, L-proline, creatine and glycine had no effect, and confocal immunofluorescent microscopy demonstrated colocalization of GAT2/BGT-1 with P-glycoprotein, a barrier-specific marker, on brain capillaries.
The GABA transporter GAT2 / BGT-1 → Gamma-aminobutyric acid source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/gaba-research/11598501.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "97e62b677991c2535e9cd91c1283edc6415a64f66def965c17e478f7b676f708", "start_char": 0, "end_char": 1589, "text_sha256": "97e62b677991c2535e9cd91c1283edc6415a64f66def965c17e478f7b676f708"}
experimental_model
Reverse transcription PCR, Western blot and confocal immunostaining with uptake kinetics in an immortalised brain capillary endothelial line
exposure
Tritiated GABA uptake by a conditionally immortalised mouse brain capillary endothelial cell line used as an in vitro barrier model
limitations
An in vitro barrier model. It identifies the transporter and its kinetics; it does not establish the direction of net flux across an intact barrier.
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 barrier has a dedicated carrier for this molecule, and its affinity is low enough that it only moves appreciable amounts at high concentrations.
primary_references
[gb-p11598501] GAT2/BGT-1 as a system responsible for the transport of gamma-aminobutyric acid at the mouse blood-brain barrier. (2001). https://pubmed.ncbi.nlm.nih.gov/11598501/ DOI: 10.1097/00004647-200110000-00012
tissue_or_cell_type
Brain capillary endothelium
transport_effect
raises Measured as cellular uptake of tritiated GABA, sodium- and chloride-dependent.
transport_pool
the expressing cell Measured as cellular uptake of tritiated GABA, sodium- and chloride-dependent.
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 326–337
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Reverse transcription PCR, Western blot and confocal immunostaining with uptake kinetics in an immortalised brain capillary endothelial line · source_derived_draft · unverified_draft
### gb-a-transporter-handles-gaba-at-the-barrier GABA transport was studied by cellular uptake of tritiated GABA which was sodium-, chloride- and concentration-dependent with a Michaelis-Menten constant of 679 plus or minus 80 micromol per litre and a maximal uptake rate of 4,790 pmol per milligram protein per 5 minutes, uptake was significantly inhibited by betaine, beta-alanine, nipecotic acid, taurine and quinidine whereas probenecid, L-proline, creatine and glycine had no effect, and confocal immunofluorescent microscopy demonstrated colocalization of GAT2/BGT-1 with P-glycoprotein, a barrier-specific marker, on brain capillaries. 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 barrier has a dedicated carrier for this molecule, and its affinity is low enough that it only moves appreciable amounts at high concentrations. organism: Mouse tissue_or_cell_type: Brain capillary endothelium experimental_model: Reverse transcription PCR, Western blot and confocal immunostaining with uptake kinetics in an immortalised brain capillary endothelial line limitations: An in vitro barrier model. It identifies the transporter and its kinetics; it does not establish the direction of net flux across an intact barrier. exposure: Tritiated GABA uptake by a conditionally immortalised mouse brain capillary endothelial cell line used as an in vitro barrier model evidence_span: {"source_cache": "artifacts/gaba-research/11598501.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "97e62b677991c2535e9cd91c1283edc6415a64f66def965c17e478f7b676f708", "start_char": 0, "end_char": 1589, "text_sha256": "97e62b677991c2535e9cd91c1283edc6415a64f66def965c17e478f7b676f708"} [gb-p11598501] GAT2/BGT-1 as a system responsible for the transport of gamma-aminobutyric acid at the mouse blood-brain barrier. (2001). https://pubmed.ncbi.nlm.nih.gov/11598501/ DOI: 10.1097/00004647-200110000-00012
Complete structured claim and evidence
Gabapentin is a novel anticonvulsant drug with a mechanism of action apparently dissimilar to that of other antiepileptic agents, the detergent-solubilized binding protein from pig cerebral cortex membranes was purified 1022-fold, the purified protein had an apparent subunit molecular weight of 130,000 and was heavily glycosylated, its partial N-terminal amino acid sequence EPFPSAVTIK was identical to that reported for the alpha2delta subunit of the L-type calcium channel, binding to cells transfected with alpha2delta complementary DNA was elevated more than 10-fold over controls, and tritiated gabapentin is the first pharmacological agent described that interacts with an alpha2delta subunit of a voltage-dependent calcium channel.
Gabapentin → The alpha-2-delta subunit of a voltage-dependent calcium channel source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/gaba-research/8621444.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1723620d459b4f48ad397d59284df3f0619894ba82c6d066a42a47a0edb22216", "start_char": 0, "end_char": 1531, "text_sha256": "1723620d459b4f48ad397d59284df3f0619894ba82c6d066a42a47a0edb22216"}
experimental_model
Purification of a radioligand binding protein from pig cerebral cortex with N-terminal sequencing and expression in transfected cells
exposure
Tritiated gabapentin binding, followed through a six-step purification to protein identity
limitations
A binding and purification study. It identifies what the drug binds; it does not test the GABA receptors, so the absence of GABA-receptor binding is not measured here.
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
Pig and rat
plain_language
The anticonvulsant designed as a GABA analogue turned out to bind a calcium channel subunit instead.
primary_references
[gb-p8621444] The novel anticonvulsant drug, gabapentin (Neurontin), binds to the alpha2delta subunit of a calcium channel. (1996). https://pubmed.ncbi.nlm.nih.gov/8621444/ DOI: 10.1074/jbc.271.10.5768
tissue_or_cell_type
Cerebral cortex, heart and skeletal muscle
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 300–311
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purification of a radioligand binding protein from pig cerebral cortex with N-terminal sequencing and expression in transfected cells · source_derived_draft · unverified_draft
### gb-the-drug-named-for-gaba-binds-a-calcium-channel Gabapentin is a novel anticonvulsant drug with a mechanism of action apparently dissimilar to that of other antiepileptic agents, the detergent-solubilized binding protein from pig cerebral cortex membranes was purified 1022-fold, the purified protein had an apparent subunit molecular weight of 130,000 and was heavily glycosylated, its partial N-terminal amino acid sequence EPFPSAVTIK was identical to that reported for the alpha2delta subunit of the L-type calcium channel, binding to cells transfected with alpha2delta complementary DNA was elevated more than 10-fold over controls, and tritiated gabapentin is the first pharmacological agent described that interacts with an alpha2delta subunit of a voltage-dependent calcium channel. 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 anticonvulsant designed as a GABA analogue turned out to bind a calcium channel subunit instead. organism: Pig and rat tissue_or_cell_type: Cerebral cortex, heart and skeletal muscle experimental_model: Purification of a radioligand binding protein from pig cerebral cortex with N-terminal sequencing and expression in transfected cells limitations: A binding and purification study. It identifies what the drug binds; it does not test the GABA receptors, so the absence of GABA-receptor binding is not measured here. exposure: Tritiated gabapentin binding, followed through a six-step purification to protein identity evidence_span: {"source_cache": "artifacts/gaba-research/8621444.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1723620d459b4f48ad397d59284df3f0619894ba82c6d066a42a47a0edb22216", "start_char": 0, "end_char": 1531, "text_sha256": "1723620d459b4f48ad397d59284df3f0619894ba82c6d066a42a47a0edb22216"} [gb-p8621444] The novel anticonvulsant drug, gabapentin (Neurontin), binds to the alpha2delta subunit of a calcium channel. (1996). https://pubmed.ncbi.nlm.nih.gov/8621444/ DOI: 10.1074/jbc.271.10.5768
Complete structured claim and evidence

The events it takes part in

A mechanism often involves more than two components. These are the full events, with every participant and its role.

Situations it appears in

Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

Open hypotheses

Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.

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

Brain capillary endothelial cells