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Relationship: 2410

Title

A descriptive phrase which clearly defines the two KEs being considered and the sequential relationship between them (i.e., which is upstream, and which is downstream). More help

Increased Cholinergic Signaling leads to Neuronal network function, Decreased

Upstream event
The causing Key Event (KE) in a Key Event Relationship (KER). More help
Increased Cholinergic Signaling
Downstream event
The responding Key Event (KE) in a Key Event Relationship (KER). More help
Neuronal network function, Decreased

Key Event Relationship Overview

The utility of AOPs for regulatory application is defined, to a large extent, by the confidence and precision with which they facilitate extrapolation of data measured at low levels of biological organisation to predicted outcomes at higher levels of organisation and the extent to which they can link biological effect measurements to their specific causes.Within the AOP framework, the predictive relationships that facilitate extrapolation are represented by the KERs. Consequently, the overall WoE for an AOP is a reflection in part, of the level of confidence in the underlying series of KERs it encompasses. Therefore, describing the KERs in an AOP involves assembling and organising the types of information and evidence that defines the scientific basis for inferring the probable change in, or state of, a downstream KE from the known or measured state of an upstream KE. More help

AOPs Referencing Relationship

AOP Name Adjacency Weight of Evidence Quantitative Understanding Point of Contact Author Status OECD Status
Organo-Phosphate Chemicals induced inhibition of AChE leading to impaired cognitive function adjacent Moderate Moderate Brendan Ferreri-Hanberry (send email) Under development: Not open for comment. Do not cite

Taxonomic Applicability

Latin or common names of a species or broader taxonomic grouping (e.g., class, order, family) that help to define the biological applicability domain of the KER.In general, this will be dictated by the more restrictive of the two KEs being linked together by the KER.  More help
Term Scientific Term Evidence Link
human Homo sapiens High NCBI
rat Rattus norvegicus High NCBI
mouse Mus musculus Moderate NCBI
Drosophila melanogaster Drosophila melanogaster Moderate NCBI
zebra fish Danio rerio Moderate NCBI

Sex Applicability

An indication of the the relevant sex for this KER. More help
Sex Evidence
Mixed High

Life Stage Applicability

An indication of the the relevant life stage(s) for this KER.  More help
Term Evidence
During brain development High

Key Event Relationship Description

Provides a concise overview of the information given below as well as addressing details that aren’t inherent in the description of the KEs themselves. More help

Cholinergic signaling refers to the activation of receptors bound with acetylcholine. Receptors for acetylcholine is either acetylcholine or cholinergic receptors, which further classify into muscarinic and nicotinic (aopwiki.org/events/39). Nicotinic cholinergic signaling is began early in development and spreads throughout the central nervous system via acetylcholine (ACh) and activating a range of ligand-gated ion channels (John D et al., 2015). Nicotinic cholinergic signaling clearly plays important roles in both during development in shaping the neural networks that form and in the adult where it modulates network function in numerous ongoing ways (John D et al., 2015). Recent study by Wang Y et al, (2021) showed that cholinergic signaling controls excitation and inhibition balance of neuronal network in brain. In thalamus neuronal networks are the target of extensive cholinergic projections from the basal forebrain. Upon activation, these cholinergic signals play important role in regulation of neuronal excitability and firing patterns of neuronal networks (Beierlein M et al., 2014).

Evidence Collection Strategy

Include a description of the approach for identification and assembly of the evidence base for the KER. For evidence identification, include, for example, a description of the sources and dates of information consulted including expert knowledge, databases searched and associated search terms/strings.  Include also a description of study screening criteria and methodology, study quality assessment considerations, the data extraction strategy and links to any repositories/databases of relevant references.Tabular summaries and links to relevant supporting documentation are encouraged, wherever possible. More help

Evidence Map 2.0

ID Experimental Design Species Upstream Observation Downstream Observation Citation (first author, year) Notes

Evidence Map

Addresses the scientific evidence supporting KERs in an AOP setting the stage for overall assessment of the AOP. More help
Title First Author
Biological Plausibility
Dose Concordance
Temporal Concordance
Incidence Concordance
Biological Plausibility
Dose Concordance Evidence
Temporal Concordance Evidence
Incidence Concordance Evidence
Uncertainties and Inconsistencies
Addresses inconsistencies or uncertainties in the relationship including the identification of experimental details that may explain apparent deviations from the expected patterns of concordance. More help

The exact mechanism by which increase in cholinergic signaling lead to decrease in neuronal network function has not been fully elucidated.

Known modulating factors

This table captures specific information on the MF, its properties, how it affects the KER and respective references.1.) What is the modulating factor? Name the factor for which solid evidence exists that it influences this KER. Examples: age, sex, genotype, diet 2.) Details of this modulating factor. Specify which features of this MF are relevant for this KER. Examples: a specific age range or a specific biological age (defined by...); a specific gene mutation or variant, a specific nutrient (deficit or surplus); a sex-specific homone; a certain threshold value (e.g. serum levels of a chemical above...) 3.) Description of how this modulating factor affects this KER. Describe the provable modification of the KER (also quantitatively, if known). Examples: increase or decrease of the magnitude of effect (by a factor of...); change of the time-course of the effect (onset delay by...); alteration of the probability of the effect; increase or decrease of the sensitivity of the downstream effect (by a factor of...) 4.) Provision of supporting scientific evidence for an effect of this MF on this KER. Give a list of references.  More help

Domain of Applicability

A free-text section of the KER description that the developers can use to explain their rationale for the taxonomic, life stage, or sex applicability structured terms. More help

The main proof of evidence comes from in vivo studies in rodents. However, Rima, M et al., (2020) carried out a thorough spatiotemporal analysis of the cholinergic system in embryonic and larval zebrafish., cholinergic neurons in vertebrates found in the brain and spinal cord including the basal forebrain, brainstem and the habenula (Ahmed NY et al., 2019; Rima M et al., 2020). In rat spinal cord cholinergic propriospinal innervation analysis was done by Sherriff FE and Henderson Z. A (1994). Study by Eadaim et al. (2020) illustrated that in vivo reduction of cholinergic signaling induced synaptic homeostasis in Drosophila neurons