Version history

{
  "kind": "infographic",
  "prompt": "Astrocyte Ca2+/Gq manipulations during memory acquisition produce bidirectional behavioral effects: Gq-DREADD/OptoGq enhance contextual fear memory (Adamsky 2018), while Gi-DREADD or chronic Ca2+ reduction (hPMCA2w/b) or acute optogenetic Ca2+ elevation AFTER training (eLife 2020) impair memory — the last result shows temporal specificity and an adenosine A1-mediated suppressive pathway. Importantly, constitutive IP3R2 KO produces no Morris-water-maze phenotype, suggesting that spatial (MWM) vs contextual-fear learning have different dependencies on astrocyte Ca2+ sources, or that global genetic knockouts engage compensation absent in acute chemogenetic/optogenetic manipulations.",
  "provider": "other",
  "raw_fields": {
    "papers": [
      {
        "doi": "10.1016/j.cell.2018.05.002",
        "value": "+40% (chemogenetic) and +89% (optogenetic) contextual freezing vs control",
        "method": "astrocyte chemogenetic/optogenetic activation + contextual fear conditioning",
        "metric": "Contextual freezing 24 h after acquisition — CA1 astrocyte Gq activation (chemogenetic + optogenetic within-study replication)",
        "conditions": [
          {
            "n": null,
            "value": "+40% elevation in contextual freezing",
            "ci_or_error": "p<0.015 (t-test)",
            "n_definition": "animals",
            "condition_label": "GFAP::hM3Dq + CNO during acquisition (chemogenetic Gq)",
            "value_source_sentence": "Remarkably, CNO application during training resulted in a 40% elevation in contextual freezing in GFAP::hM3Dq mice tested 24 hr after acquisition, when CNO was no longer present ( Alexander et al., 2009 ) ( Figure 4 E; p < 0.015, t test)."
          },
          {
            "n": null,
            "value": "+89% elevation in contextual freezing",
            "ci_or_error": "p<0.05 (t-test)",
            "n_definition": "animals",
            "condition_label": "GFAP::OptoGq + light during acquisition (optogenetic Gq)",
            "value_source_sentence": "Remarkably, light administration during training resulted in 89% elevation in contextual freezing in GFAP::OptoGq mice tested a day later ( Figure 7 E) (p < 0.05, t test)."
          }
        ],
        "text_access": "fulltext",
        "scope_region": "hippocampus CA1",
        "study_system": "mouse, CA1 astrocyte Gq (hM3Dq/OptoGq), contextual fear conditioning in vivo",
        "taxonomic_level": "fine type",
        "contrast_summary": "Bidirectional independent confirmation: both chemogenetic and optogenetic Gq activation of CA1 astrocytes during acquisition enhance contextual fear memory 24 h later (+40% and +89% freezing vs controls).",
        "scope_population": "astrocyte Gq activation during acquisition",
        "value_source_sentence": "CNO application during training resulted in a 40% elevation in contextual freezing in GFAP::hM3Dq mice tested 24 hr after acquisition; light administration during training resulted in 89% elevation in contextual freezing in GFAP::OptoGq mice tested a day later.",
        "experimental_conditions": "Gq activation (CNO or light) during acquisition; recall 24 h later"
      },
      {
        "n": 12,
        "doi": "10.1038/s41593-020-0679-6",
        "value": "significantly impaired recall at 20 d post-conditioning (t(10)=2.2, p=0.028)",
        "method": "astrocyte chemogenetic inhibition + remote memory test",
        "metric": "Remote contextual memory retrieval (freezing) after Gi-DREADD astrocyte manipulation during acquisition",
        "n_analyzed": "~12 mice (df=10)",
        "ci_or_error": "t(10)=2.2, p=0.028",
        "text_access": "fulltext",
        "n_definition": "animals",
        "scope_region": "hippocampus CA1 (with PFC engram recording)",
        "study_system": "mouse, CA1 GFAP::hM4Di (Gi-DREADD), contextual fear conditioning in vivo",
        "taxonomic_level": "fine type",
        "scope_population": "astrocyte Gi-DREADD during acquisition",
        "value_source_sentence": "Remarkably, when the same mice were tested in the same context 20 days later, those treated with CNO during conditioning showed a dramatic impairment in memory retrieval (t (10) =2.2; p=0.028)( Fig.1I left ).",
        "experimental_conditions": "CNO during acquisition, remote (20 d) retrieval test"
      },
      {
        "doi": "10.7554/elife.57155",
        "value": "impaired contextual freezing in both directions of perturbation",
        "method": "optogenetic astrocyte activation + genetic Ca2+ reduction + contextual fear",
        "metric": "Contextual fear freezing — bidirectional astrocyte Ca2+ manipulations (within-study contrast)",
        "conditions": [
          {
            "n": 36,
            "value": "significantly decreased freezing on day 2",
            "ci_or_error": "p<0.0001 (unpaired two-tailed t-test)",
            "n_definition": "rats (18 ctrl + 18 stim, day 2)",
            "condition_label": "optogenetic astrocyte activation (GFAP-ChR2) 1 h post-training (acute Ca2+ elevation during consolidation)",
            "value_source_sentence": "( E ) Freezing levels of control and photostimulated GFAP-ChR2-EYFP rats during contextual fear tests on day 2 (n = 18 ctrl, n = 18 stim; p < 0.0001, Student's unpaired two-tailed t-test)."
          },
          {
            "n": 20,
            "value": "significantly decreased freezing (contextual)",
            "ci_or_error": "p=0.0044 (unpaired two-tailed t-test)",
            "n_definition": "rats (10 ctrl + 10 hPMCA2w/b)",
            "condition_label": "hPMCA2w/b overexpression (chronic astrocyte Ca2+ extrusion → reduced astrocyte Ca2+)",
            "value_source_sentence": "( J and K ) Freezing levels of control (n = 10) and hPMCA2w/b (n = 10) rats during contextual fear memory (J, p=0.0044, Student's unpaired two-tailed t-test) and cued fear memory tests (K, p=0.6784)."
          }
        ],
        "text_access": "fulltext",
        "scope_region": "hippocampus CA1",
        "study_system": "rat, CA1 astrocyte ChR2 / hPMCA2w/b, contextual fear conditioning",
        "taxonomic_level": "fine type",
        "contrast_summary": "Within the same study, both acute post-training optogenetic astrocyte activation AND chronic astrocyte Ca2+ reduction impair contextual fear memory — consistent with a narrow temporal window for permissive astrocyte Ca2+ signaling during consolidation, with adenosine A1R implicated as the downstream suppressive mediator when Ca2+ is elevated off-window.",
        "scope_population": "CA1 astrocytes during consolidation",
        "value_source_sentence": "Photostimulated GFAP-ChR2-EYFP rats showed reduced freezing on day 2 (n=18/18, p<0.0001); hPMCA2w/b rats showed reduced freezing in contextual fear memory (n=10/10, p=0.0044).",
        "experimental_conditions": "post-training photostim OR chronic Ca2+ extrusion"
      },
      {
        "n": 0,
        "doi": "10.3389/fnbeh.2014.00384",
        "value": "no detectable change from WT",
        "method": "Morris water maze",
        "metric": "Morris water maze performance in astrocyte IP3R2 conditional KO",
        "n_analyzed": "not specified in this sentence",
        "ci_or_error": null,
        "text_access": "fulltext",
        "n_definition": "animals",
        "scope_region": "hippocampus (spatial learning)",
        "study_system": "mouse, constitutive IP3R2 cKO vs WT, behavioral battery",
        "taxonomic_level": "broad category",
        "scope_population": "constitutive IP3R2 ablation",
        "value_source_sentence": "Morris water maze testing, a behavioral correlate of learning and memory, was unaffected by lack of astrocyte IP3R2-mediated Ca(2+)-signaling.",
        "experimental_conditions": "IP3R2 cKO constitutive"
      }
    ],
    "comparison_id": "behavioral-learning-astrocyte-ca-manipulation",
    "comparison_name": "Behavioral learning outcomes across bidirectional astrocyte Ca2+/Gq/Gi manipulations during hippocampal memory encoding",
    "comparison_type": "cross-study conflict",
    "what_it_reveals": "Astrocyte Ca2+/Gq manipulations during memory acquisition produce bidirectional behavioral effects: Gq-DREADD/OptoGq enhance contextual fear memory (Adamsky 2018), while Gi-DREADD or chronic Ca2+ reduction (hPMCA2w/b) or acute optogenetic Ca2+ elevation AFTER training (eLife 2020) impair memory — the last result shows temporal specificity and an adenosine A1-mediated suppressive pathway. Importantly, constitutive IP3R2 KO produces no Morris-water-maze phenotype, suggesting that spatial (MWM) vs contextual-fear learning have different dependencies on astrocyte Ca2+ sources, or that global genetic knockouts engage compensation absent in acute chemogenetic/optogenetic manipulations.",
    "homogeneity_check": {
      "caveats": [
        "Species differ (mouse vs rat) across rows.",
        "Manipulation directionality (gain-of-function Gq vs loss-of-function Gi/hPMCA2) and timing (during vs after acquisition) are not uniform — these are part of the comparison but limit simple bar-chart interpretation.",
        "IP3R2 cKO row uses Morris water maze (spatial) rather than contextual fear conditioning — different behavioral assay with different hippocampal circuit requirements.",
        "Effect sizes from Adamsky (% freezing elevation) vs eLife (p-values only) vs Kol (t-statistic) are not in a common unit — a harmonized standardized-mean-difference would be needed for a true meta-analytic forest."
      ],
      "n_definition_uniform": "true",
      "scope_region_uniform": "true",
      "taxonomic_level_uniform": "false",
      "scope_population_uniform": "false"
    },
    "suggested_plot_type": "grouped bar"
  },
  "section_id": "section_08_evidence_package",
  "source_url": "https://github.com/AllenNeuralDynamics/ComputationalReviewAstrocytes/blob/1a55da0634a3bc04e5688792ed12141ce271d28e/evidence/section_08_evidence_package.json",
  "target_ref": "wiki_page:computationalreviewastrocytes-08",
  "review_repo": "ComputationalReviewAstrocytes",
  "section_ref": "wiki_page:computationalreviewastrocytes-08",
  "source_path": "evidence/section_08_evidence_package.json",
  "source_refs": [
    "paper:paper-79c338afafe0",
    "paper:paper-9c595c660d61",
    "paper:paper-a0c78e76bd52",
    "paper:paper-d31b944234b2"
  ],
  "section_title": "Astrocytes in Synaptic Plasticity",
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