Regional distribution of astrocyte glutamate transporters GLT-1 and GLAST

Astrocyte glutamate transporter composition is region-specific: GLT-1 dominates in cortex, hippocampus and striatum, while GLAST dominates in cerebellar Bergmann glia. This functional regional asymmetry predicts different glutamate clearance kinetics and supports the concept that cerebellar Bergmann glia are a distinct functional astrocyte class.

{
  "papers": [
    {
      "n": 0,
      "doi": "10.1523/jneurosci.15-03-01835.1995",
      "value": "highest in hippocampus, lateral septum, cerebral cortex, and striatum | preferentially expressed in the molecular layer of the cerebellum",
      "method": "immunoblot + immunocytochemistry (light+EM) | immunoblot + immunocytochemistry",
      "metric": "regional abundance of GLT-1 (EAAT2) across brain regions | regional abundance of GLAST (EAAT1) across brain regions",
      "text_access": "abstract_only",
      "n_definition": "immunoblot and immunocytochemistry of rat brain regions | immunoblot/ICC; regional relative signal",
      "scope_region": "whole rat brain, multiple regions | rat cerebellum (molecular layer)",
      "study_system": "adult rat brain | adult rat brain, cerebellum focused",
      "taxonomic_level": "region | region/subtype",
      "scope_population": "astrocytes (both transporters restricted to astrocytes) | Bergmann glia (cerebellar astrocytes)",
      "value_source_sentence": "GLT-1 is expressed at the highest concentrations in the hippocampus, lateral septum, cerebral cortex, and striatum, while GLAST is preferentially expressed in the molecular layer of the cerebellum.",
      "experimental_conditions": "polyclonal antibodies vs GLT-1 (73 kDa) and GLAST (66 kDa) | polyclonal antibodies vs GLAST"
    },
    {
      "n": 0,
      "doi": "10.1016/0896-6273(94)90038-8",
      "value": "most abundant in Bergmann glia in cerebellar molecular layer; also present in cortex, hippocampus, and deep cerebellar nuclei",
      "method": "immunohistochemistry",
      "metric": "GLAST cellular and regional localization",
      "n_analyzed": null,
      "ci_or_error": null,
      "text_access": "abstract_only",
      "n_definition": "tissue sections stained with GLAST antibody",
      "scope_region": "cerebellum, cortex, hippocampus, DCN",
      "study_system": "rat brain immunohistochemistry",
      "taxonomic_level": "region",
      "scope_population": "astrocytes and Bergmann glia",
      "value_source_sentence": "GLAST is most abundant in Bergmann glia in the cerebellar molecular layer brain, but is also present in the cortex, hippocampus, and deep cerebellar nuclei.",
      "experimental_conditions": "GLAST immunoperoxidase staining"
    }
  ],
  "comparison_id": "glutamate-transporter-regional-distribution",
  "comparison_name": "Regional distribution of astrocyte glutamate transporters GLT-1 and GLAST",
  "comparison_type": "convergent evidence",
  "what_it_reveals": "Astrocyte glutamate transporter composition is region-specific: GLT-1 dominates in cortex, hippocampus and striatum, while GLAST dominates in cerebellar Bergmann glia. This functional regional asymmetry predicts different glutamate clearance kinetics and supports the concept that cerebellar Bergmann glia are a distinct functional astrocyte class.",
  "homogeneity_check": {
    "caveats": [
      "All source sentences are from abstracts — no per-region quantitative density values extracted; only qualitative ordinal comparisons are safe to plot.",
      "Both primary papers are from the same lab-lineage (Storck/Rothstein/Danbolt era), which limits independence."
    ],
    "n_definition_uniform": "false",
    "scope_region_uniform": "false",
    "taxonomic_level_uniform": "true",
    "scope_population_uniform": "true"
  },
  "suggested_plot_type": "heatmap (regions × transporter)"
}

[
  "paper:paper-02c3451f16e4",
  "paper:paper-cb637c18583c"
]

{
  "mode": "public_source_pointer_with_short_context",
  "notes": [
    "Local review repositories are read-only inputs.",
    "SciDEX stores paper metadata, structured evidence, file pointers, and short citation contexts; it does not copy full review prose."
  ],
  "source_commit_sha": "1a55da0634a3bc04e5688792ed12141ce271d28e",
  "source_repository_url": "https://github.com/AllenNeuralDynamics/ComputationalReviewAstrocytes"
}