Version history

{
  "kind": "infographic",
  "prompt": "Astrocyte Ca2+ activity is strongly modulated by arousal/state across preparations and regions: sleep deprivation nearly doubles mean astrocyte ΔF/F (Ingiosi 2020), wake transitions are preceded by astrocyte Ca2+ in 60–72% of cases (Bojarskaite 2020), locomotion-induced responses peak ~5 s in cerebellum vs ~8 s in V1 with NE-dependence (Ethanol abolishes paper), and acute NE application in NAc slices produces a ~14-fold jump in event frequency (Mederos 2024/Cells). Together these establish NE as the dominant state signal that shapes astrocyte Ca2+ across wake/sleep and across brain regions, but with region- and compartment-specific gain.",
  "provider": "other",
  "raw_fields": {
    "papers": [
      {
        "n": 31,
        "doi": "10.1038/s41467-020-19475-5",
        "value": "8.5 ± 0.2 s (V1) vs 5.3 ± 0.1 s (Bergmann glia)",
        "method": "two-photon in vivo Ca2+ imaging",
        "metric": "time to peak of locomotion-induced astrocyte Ca2+ response",
        "n_analyzed": "V1: 31 events from 15 mice; BG: 30 events from 14 mice",
        "ci_or_error": "± SEM",
        "text_access": "fulltext",
        "n_definition": "locomotion events",
        "scope_region": "V1 + cerebellum",
        "study_system": "mouse; in vivo two-photon; primary visual cortex + cerebellar Bergmann glia",
        "taxonomic_level": "subtype",
        "scope_population": "cortical astrocytes + Bergmann glia",
        "value_source_sentence": "V1 astrocyte activation reached the peak more slowly than in BG (time to peak V1 , 8.5 ± 0.2 s, n = 31 (15 mice), time to peak BG , 5.3 ± 0.1 s, n = 30 (14 mice), t (59) = 15.784, p t -test) indicating that local signaling constraints differ 7 .",
        "experimental_conditions": "voluntary locomotion; GCaMP3/6f in astrocytes; Adra1a-floxed for α1A conditional KO"
      },
      {
        "n": 0,
        "doi": "10.1038/s41467-020-17062-2",
        "value": "60% (NREM→wake); 72% (IS→wake)",
        "method": "two-photon + polysomnography",
        "metric": "fraction of sleep-wake transitions preceded by astrocyte Ca2+ increase",
        "n_analyzed": "sleep-wake transitions pooled across mice",
        "ci_or_error": "percentage of transitions",
        "text_access": "fulltext",
        "n_definition": "behavioral state transitions",
        "scope_region": "somatosensory cortex",
        "study_system": "mouse; in vivo two-photon; somatosensory cortex; Lck-GCaMP6f",
        "taxonomic_level": "subcellular",
        "scope_population": "Lck-targeted membrane-adjacent astrocyte domain",
        "value_source_sentence": "We observed a prominent increase in astrocytic Ca 2+ signal frequency 1–2 s before the shift in ECoG, EMG, and mouse movement in 60% of NREM sleep to wakefulness and 72% of IS sleep to wakefulness transitions (Fig.",
        "experimental_conditions": "natural sleep-wake cycle with ECoG/EMG"
      },
      {
        "n": 0,
        "doi": "10.1016/j.cub.2020.08.052",
        "value": "187.55% ± 20.56% of baseline",
        "method": "two-photon in vivo Ca2+ imaging",
        "metric": "cortical astrocyte Ca2+ amplitude after sleep deprivation (ZT6)",
        "n_analyzed": "mice (n not extracted in this sentence)",
        "ci_or_error": "± 20.56% SEM",
        "text_access": "fulltext",
        "n_definition": "animals",
        "scope_region": "cortex",
        "study_system": "mouse; in vivo two-photon; cortex; GCaMP6f in astrocytes",
        "taxonomic_level": "broad class",
        "scope_population": "cortical astrocytes",
        "value_source_sentence": "We found that, averaged across all states, mean ΔF/F increased immediately after SD at ZT6 (when sleep need is maximally discharging [ 21 , 22 ]) and then declined in parallel with changes in NREM SWA at ZT12 (ZT6, 187.55% ± 20.56% versus baseline; ZT12, 106.0",
        "experimental_conditions": "sleep deprivation paradigm; continuous Ca2+ imaging"
      },
      {
        "n": 0,
        "doi": "10.3390/cells14010024",
        "value": "1320 ± 123 events/min (NE) vs 93 ± 12 (basal); ~14-fold",
        "method": "acute-slice 2P Ca2+ imaging + AQuA event detection",
        "metric": "increase in NAc astrocyte Ca2+ event frequency on NE application",
        "n_analyzed": "astropile events pooled across slices",
        "ci_or_error": "± SEM",
        "text_access": "fulltext",
        "n_definition": "Ca2+ events per minute at astropile (aggregated process territory)",
        "scope_region": "nucleus accumbens / ventral striatum",
        "study_system": "mouse; acute brain slice; ventral hippocampus/NAc; GCaMP6f",
        "taxonomic_level": "broad class",
        "scope_population": "astrocytes (Aldh1l1 or SR101 positive)",
        "value_source_sentence": "Figure 2 e,f show that, compared to the frequency observed at basal conditions, the number of Ca 2+ events at astropile increased robustly during the first minute of the astrocyte response to NE (astropile Ca 2+ events/min: NE, 1320 ± 123 vs. basal, 93 ± 12; p 2+ events/min ( Figure 2 f).",
        "experimental_conditions": "NE application (high concentration); acute slice AQuA-detected events"
      }
    ],
    "comparison_id": "arousal-state-astrocyte-ca-modulation",
    "comparison_name": "State-dependent modulation of astrocyte Ca2+ activity across arousal/sleep/wake contexts",
    "comparison_type": "cross-study convergent evidence on state-modulation magnitude",
    "what_it_reveals": "Astrocyte Ca2+ activity is strongly modulated by arousal/state across preparations and regions: sleep deprivation nearly doubles mean astrocyte ΔF/F (Ingiosi 2020), wake transitions are preceded by astrocyte Ca2+ in 60–72% of cases (Bojarskaite 2020), locomotion-induced responses peak ~5 s in cerebellum vs ~8 s in V1 with NE-dependence (Ethanol abolishes paper), and acute NE application in NAc slices produces a ~14-fold jump in event frequency (Mederos 2024/Cells). Together these establish NE as the dominant state signal that shapes astrocyte Ca2+ across wake/sleep and across brain regions, but with region- and compartment-specific gain.",
    "homogeneity_check": {
      "caveats": [
        "Mixed preparations: acute slice (Mederos 2024 Cells) vs. in vivo two-photon (all others). Acute slice NE responses operate at supraphysiological concentrations without endogenous LC firing dynamics.",
        "Metrics are heterogeneous: time-to-peak (Ethanol paper), fraction of transitions (Bojarskaite), ΔF/F amplitude (Ingiosi), event frequency (Mederos 2024). These quantify different aspects of a modulation and should be interpreted as complementary, not directly comparable.",
        "Indicator differs: GCaMP3 vs GCaMP6f vs Lck-GCaMP6f — membrane-tethered Lck detects distinct events (faster, process-localized) that cytosolic indicators underreport.",
        "Behavioral context differs: locomotion (Ethanol paper), sleep-wake (Bojarskaite, Ingiosi), and pharmacological NE bath (Mederos 2024). Endogenous LC firing during behavior likely produces lower effective NE concentration than bath application.",
        "n-definitions: Ethanol paper uses \"events from N mice\"; Bojarskaite uses fraction of transitions; Mederos uses events-per-minute per slice; Ingiosi uses animals. Not directly comparable as effect sizes."
      ],
      "n_definition_uniform": "false",
      "scope_region_uniform": "false",
      "taxonomic_level_uniform": "false",
      "scope_population_uniform": "false"
    },
    "suggested_plot_type": "grouped bar chart with percentage-of-baseline normalization and region stratification"
  },
  "section_id": "section_09_evidence_package",
  "source_url": "https://github.com/AllenNeuralDynamics/ComputationalReviewAstrocytes/blob/1a55da0634a3bc04e5688792ed12141ce271d28e/evidence/section_09_evidence_package.json",
  "target_ref": "wiki_page:computationalreviewastrocytes-09",
  "review_repo": "ComputationalReviewAstrocytes",
  "section_ref": "wiki_page:computationalreviewastrocytes-09",
  "source_path": "evidence/section_09_evidence_package.json",
  "source_refs": [
    "paper:paper-7f6000297c9c",
    "paper:paper-9a1be146dacd",
    "paper:paper-c96835af4a7d",
    "paper:paper-cce7cf166da0"
  ],
  "section_title": "In Vivo Astrocyte Dynamics During Behavior",
  "source_policy": {
    "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"
  },
  "generation_status": "complete",
  "review_bundle_ref": "analysis_bundle:ab-029ee9411fe2",
  "origin_url": "https://github.com/AllenNeuralDynamics/ComputationalReviewAstrocytes/blob/1a55da0634a3bc04e5688792ed12141ce271d28e/evidence/section_09_evidence_package.json",
  "commit_sha": "1a55da0634a3bc04e5688792ed12141ce271d28e",
  "created_by": "persona-jerome-lecoq-gbo-neuroscience",
  "repository_url": "https://github.com/AllenNeuralDynamics/ComputationalReviewAstrocytes"
}