Source 1review1996Progress in Neurobiology
Toolkit/optic nerve stimulation-evoked SCN field potential assay
optic nerve stimulation-evoked SCN field potential assay
Also known as: electrical stimulation of the optic nerves, SCN field potentials evoked by stimulation of the optic nerve
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
In hypothalamic slice preparations in vitro, electrical stimulation of the optic nerves induces release of glutamate and aspartate, and glutamate antagonists block field potentials in the SCN evoked by stimulation of the optic nerve.
Usefulness & Problems
Why this is useful
This assay stimulates optic nerve inputs in hypothalamic slices and measures evoked SCN field potentials. The review states that these responses are blocked by glutamate antagonists.; probing synaptic transmission from optic nerve input to the SCN in vitro; testing pharmacologic sensitivity of evoked SCN responses to glutamate antagonists
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This assay stimulates optic nerve inputs in hypothalamic slices and measures evoked SCN field potentials. The review states that these responses are blocked by glutamate antagonists.
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probing synaptic transmission from optic nerve input to the SCN in vitro
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testing pharmacologic sensitivity of evoked SCN responses to glutamate antagonists
Problem solved
It functionally tests whether optic input to the SCN is mediated by excitatory amino acid transmission.; provides a functional electrophysiology-style readout linking optic nerve input to glutamatergic SCN responses
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It functionally tests whether optic input to the SCN is mediated by excitatory amino acid transmission.
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provides a functional electrophysiology-style readout linking optic nerve input to glutamatergic SCN responses
Problem links
provides a functional electrophysiology-style readout linking optic nerve input to glutamatergic SCN responses
LiteratureIt functionally tests whether optic input to the SCN is mediated by excitatory amino acid transmission.
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It functionally tests whether optic input to the SCN is mediated by excitatory amino acid transmission.
Taxonomy & Function
Primary hierarchy
Technique Branch
Method: A concrete measurement method used to characterize an engineered system.
Mechanisms
electrical activation of optic nerve afferentsglutamatergic neurotransmissionpharmacological blockade by glutamate antagonistssynaptic release of glutamate and aspartateTechniques
Functional AssayTarget processes
No target processes tagged yet.
Input: Electrical
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: sensor
It requires in vitro hypothalamic slice preparations, electrical stimulation hardware, electrophysiology recording, and glutamatergic antagonists. The abstract also links the preparation to measurement of glutamate and aspartate release.; requires hypothalamic slice preparations containing the relevant pathway; requires electrical stimulation and field potential recording capability; requires pharmacologic antagonists for perturbation testing
It does not by itself establish long-term behavioral entrainment outcomes or fully resolve which glutamate receptor subunits are responsible.; the abstract does not specify stimulation parameters, recording configuration, or whether responses isolate specific receptor classes
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
The review states that application of glutamate to in vitro preparations phase shifts persistent circadian electrical rhythms in a way that mimics light-induced phase shifting in vivo.
The review states that glutamate antagonists can block light-induced phase shifting of circadian rhythms and block light-induced c-fos induction in SCN cells, while NMDA induces c-fos expression.
The review states that electrical stimulation of the optic nerves in hypothalamic slices induces glutamate and aspartate release and evokes SCN field potentials that are blocked by glutamate antagonists.
Approval Evidence
1 source1 linked approval claimfirst-pass slug optic-nerve-stimulation-evoked-scn-field-potential-assay
In hypothalamic slice preparations in vitro, electrical stimulation of the optic nerves induces release of glutamate and aspartate, and glutamate antagonists block field potentials in the SCN evoked by stimulation of the optic nerve.
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synaptic physiologysupports
The review states that electrical stimulation of the optic nerves in hypothalamic slices induces glutamate and aspartate release and evokes SCN field potentials that are blocked by glutamate antagonists.
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Comparisons
Source-stated alternatives
The review contrasts this with behavioral phase-shift experiments, c-fos induction assays, and direct glutamate application to slices that phase shift ongoing rhythms.
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The review contrasts this with behavioral phase-shift experiments, c-fos induction assays, and direct glutamate application to slices that phase shift ongoing rhythms.
Source-backed strengths
connects pathway stimulation to measurable SCN field potentials; supports antagonist-sensitive functional interrogation in slice preparations
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connects pathway stimulation to measurable SCN field potentials
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supports antagonist-sensitive functional interrogation in slice preparations
Compared with assays
The review contrasts this with behavioral phase-shift experiments, c-fos induction assays, and direct glutamate application to slices that phase shift ongoing rhythms.
Shared frame: source-stated alternative in extracted literature
Strengths here: connects pathway stimulation to measurable SCN field potentials; supports antagonist-sensitive functional interrogation in slice preparations.
Relative tradeoffs: the abstract does not specify stimulation parameters, recording configuration, or whether responses isolate specific receptor classes.
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The review contrasts this with behavioral phase-shift experiments, c-fos induction assays, and direct glutamate application to slices that phase shift ongoing rhythms.
Ranked Citations
- 1.