Source 1primary paper2016Proceedings of the National Academy of Sciences
Toolkit/optical VTA stimulation
optical VTA stimulation
Also known as: VTA optical stimulation
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Optical VTA stimulation in ChR2+ mice during continuous, steady-state general anesthesia (CSSGA) with isoflurane produced behavioral and EEG evidence of arousal and restored the righting reflex.
Usefulness & Problems
Why this is useful
Optical VTA stimulation is the intervention used to activate the targeted VTA population during anesthesia. In the ChR2+ condition, it was associated with arousal-related EEG and behavioral changes.; activating targeted VTA neurons during anesthesia; testing causal effects of VTA stimulation on arousal
Source:
Optical VTA stimulation is the intervention used to activate the targeted VTA population during anesthesia. In the ChR2+ condition, it was associated with arousal-related EEG and behavioral changes.
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activating targeted VTA neurons during anesthesia
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testing causal effects of VTA stimulation on arousal
Problem solved
It solves the need for temporally precise stimulation during an anesthetized state. This allows direct testing of whether stimulation can trigger reanimation.; provides temporally controlled stimulation of a targeted brain region during anesthesia experiments
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It solves the need for temporally precise stimulation during an anesthetized state. This allows direct testing of whether stimulation can trigger reanimation.
Source:
provides temporally controlled stimulation of a targeted brain region during anesthesia experiments
Problem links
provides temporally controlled stimulation of a targeted brain region during anesthesia experiments
LiteratureIt solves the need for temporally precise stimulation during an anesthetized state. This allows direct testing of whether stimulation can trigger reanimation.
Source:
It solves the need for temporally precise stimulation during an anesthetized state. This allows direct testing of whether stimulation can trigger reanimation.
Published Workflows
Objective: Test whether selective optogenetic activation of VTA dopamine neurons is sufficient to induce arousal and reanimation from an anesthetized unconscious state.
Why it works: The workflow combines cell-type-targeted ChR2 expression in DAT-cre mice with optical VTA stimulation to test causal sufficiency, then uses a no-ChR2 control and D1 receptor antagonist pretreatment to distinguish opsin-dependent and receptor-dependent effects.
selective stimulation of VTA dopamine neuronsdopamine D1 receptor-dependent arousal signalingCre-dependent optogeneticsoptical stimulationbehavioral righting assayEEG monitoringpharmacologic antagonism
Taxonomy & Function
Primary hierarchy
Technique Branch
Method: A concrete measurement method used to characterize an engineered system.
Mechanisms
d1 receptor-dependent signalingdopaminergic arousal signalingneuronal activationoptogenetic depolarization via channelrhodopsin-2Techniques
Functional AssayTarget processes
recombinationInput: Light
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationimplementation constraint: payload burdenimplementation constraint: spectral hardware requirementoperating role: sensor
The abstract supports the need for VTA-targeted expression of ChR2 and optical stimulation during continuous steady-state isoflurane anesthesia. EEG and righting reflex measurements were used to evaluate outcomes.; requires VTA targeting; requires optical hardware and stimulation during steady-state isoflurane anesthesia
By itself, optical stimulation does not guarantee cell-type specificity without the appropriate genetic construct. It also does not identify the receptor mechanism without additional pharmacology.; did not restore righting or produce EEG changes in control mice lacking ChR2; requires prior opsin expression for cell-type-selective effects
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Observations
successMousemechanistic demomouse
behavioral righting and arousal response
Inferred from claim c2 during normalization. D1 receptor antagonist pretreatment inhibits the arousal and righting-restoration effects of optical stimulation of VTA dopamine neurons during isoflurane anesthesia. Derived from claim c2.
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inhibition of arousal responses and righting restoration(6/6 mice)
successMouseapplication demomouse
behavioral and EEG
Inferred from claim c1 during normalization. Selective optogenetic activation of VTA dopamine neurons is sufficient to induce arousal from an anesthetized unconscious state during steady-state isoflurane anesthesia. Derived from claim c1.
Source:
righting restoration(6/6 mice)
Supporting Sources
Ranked Claims
Optical VTA stimulation does not restore righting or produce EEG changes in control DAT-cre mice targeted with a viral vector lacking ChR2 during steady-state isoflurane anesthesia.
absence of righting restoration and EEG changes 5/5 mice
D1 receptor antagonist pretreatment inhibits the arousal and righting-restoration effects of optical stimulation of VTA dopamine neurons during isoflurane anesthesia.
inhibition of arousal responses and righting restoration 6/6 mice
Selective optogenetic activation of VTA dopamine neurons is sufficient to induce arousal from an anesthetized unconscious state during steady-state isoflurane anesthesia.
righting restoration 6/6 mice
Approval Evidence
1 source3 linked approval claimsfirst-pass slug optical-vta-stimulation
Optical VTA stimulation in ChR2+ mice during continuous, steady-state general anesthesia (CSSGA) with isoflurane produced behavioral and EEG evidence of arousal and restored the righting reflex.
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control resultsupports
Optical VTA stimulation does not restore righting or produce EEG changes in control DAT-cre mice targeted with a viral vector lacking ChR2 during steady-state isoflurane anesthesia.
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mechanismsupports
D1 receptor antagonist pretreatment inhibits the arousal and righting-restoration effects of optical stimulation of VTA dopamine neurons during isoflurane anesthesia.
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sufficiencysupports
Selective optogenetic activation of VTA dopamine neurons is sufficient to induce arousal from an anesthetized unconscious state during steady-state isoflurane anesthesia.
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Comparisons
Source-stated alternatives
The abstract contrasts optical stimulation outcomes between ChR2+ and ChR2- groups. The rationale also mentions DA transporter inhibitors as a pharmacologic route to increasing arousal.
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The abstract contrasts optical stimulation outcomes between ChR2+ and ChR2- groups. The rationale also mentions DA transporter inhibitors as a pharmacologic route to increasing arousal.
Source-backed strengths
elicited behavioral and EEG evidence of arousal in ChR2+ mice
Source:
elicited behavioral and EEG evidence of arousal in ChR2+ mice
Compared with calcium imaging
optical VTA stimulation and calcium imaging address a similar problem space because they share recombination.
Shared frame: same top-level item type; shared target processes: recombination; same primary input modality: light
Relative tradeoffs: appears more independently replicated; looks easier to implement in practice.
Compared with open-source microplate reader
optical VTA stimulation and open-source microplate reader address a similar problem space because they share recombination.
Shared frame: same top-level item type; shared target processes: recombination; same primary input modality: light
Compared with two-photon excitation microscopy
optical VTA stimulation and two-photon excitation microscopy address a similar problem space because they share recombination.
Shared frame: same top-level item type; shared target processes: recombination; same primary input modality: light
Ranked Citations
- 1.