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Event: 264

Key Event Title

A descriptive phrase which defines a discrete biological change that can be measured. More help

Activation, SREBP-1c

Short name

The KE short name should be a reasonable abbreviation of the KE title and is used in labelling this object throughout the AOP-Wiki. More help

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Key Event Description

A description of the biological state being observed or measured, the biological compartment in which it is measured, and its general role in the biology should be provided. More help

An increase on the mRNA of the SREBP-1c is responsible for an increase of the mRNA of lipogenic enzymes like acetyl-CoA carboxylase (ACC) and fatty acid synthase (FAS) (Foretz et al. 1999, Foretz et al. 2000). This finding is demonstrated from the absence of triglyceride accumulation on SREBP-1c (-/-) mice ^[1], ^[2], ^[3], ^[4].

However there is evidence that this effect is not induced in the embryonic state indicating a different role of the SREBP-1c between embryonic and adult life ^[5]. It is also suggested that for lipogenic genes, SREBP-1c acts together with ChREBP ^[6]. In addition, in STZ diabetic mice, adenovirus-mediated over-expression of SREBP-1c in the liver resulted in an increase of lipogenic enzyme expression with an increase of the triglyceride hepatic content and a marked decrease in the hyperglycaemia of diabetic mice mimicking perfectly the effect of an insulin injection ^[7].

Finally there are a number of studies that demonstrated that SREBP-1c is essential for glucokinase (GK) expression and that it is a mediator of insulin action ^[8], ^[9].

How It Is Measured or Detected

In the context of the EMOD/M2AOP prototyping, there are 2 components to the How it is Measured or Detected field, a structured component for adding Assay information and a free text component for unstructured descriptive information.In the free text field, include a description of the type(s) of measurements that can be employed to evaluate the KE and the relative level of scientific confidence in those measurements. These can range from citation of specific validated test guidelines, citation of specific methods published in the peer reviewed literature, or outlines of a general protocol or approach (e.g., a protein may be measured by ELISA). Do not provide detailed protocols. More help

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Observations 2.0

Observed meausures are instances of assay results that support this Key Event More help

ID	Experimental Effect	Biological Object	Biological Process	Method of Measurement	Notes	Evidence Source ID	Citation (first author, year)

Observed Measures 1.0

Observed meausures are instances of assay results that support this Key Event More help

ID	Stressor	Sample (short_name)	Assay	Effect

Key Event Components

The KE, as defined by a set structured ontology terms consisting of a biological process, object, and action with each term originating from one of 14 biological ontologies (Ives, et al., 2017; https://aopwiki.org/info_pages/2/info_linked_pages/7#List). Biological process describes dynamics of the underlying biological system (e.g., receptor signalling).Biological process describes dynamics of the underlying biological system (e.g., receptor signaling). The biological object is the subject of the perturbation (e.g., a specific biological receptor that is activated or inhibited). Action represents the direction of perturbation of this system (generally increased or decreased; e.g., ‘decreased’ in the case of a receptor that is inhibited to indicate a decrease in the signaling by that receptor). Note that when editing Event Components, clicking an existing Event Component from the Suggestions menu will autopopulate these fields, along with their source ID and description. To clear any fields before submitting the event component, use the 'Clear process,' 'Clear object,' or 'Clear action' buttons. If a desired term does not exist, a new term request may be made via Term Requests. Event components may not be edited; to edit an event component, remove the existing event component and create a new one using the terms that you wish to add. Further information on Event Components and Biological Context may be viewed on the attached pdf. More help

Process	Object	Action
SREBP signaling pathway	sterol regulatory element-binding protein 1	increased

Biological Context

Structured terms, selected from a drop-down menu, are used to identify the level of biological organization for each KE. More help

Level of Biological Organization
Molecular

Cell term

The location/biological environment in which the event takes place.The biological context describes the location/biological environment in which the event takes place. For molecular/cellular events this would include the cellular context (if known), organ context, and species/life stage/sex for which the event is relevant. For tissue/organ events cellular context is not applicable. For individual/population events, the organ context is not applicable. Further information on Event Components and Biological Context may be viewed on the attached pdf. More help

Cell term
hepatocyte

Organ term

Key Event Overview

AOPs Including This Key Event

All of the AOPs that are linked to this KE will automatically be listed in this subsection. This table can be particularly useful for derivation of AOP networks including the KE.Clicking on the name of the AOP will bring you to the individual page for that AOP. More help

AOP Name	Role of event in AOP	Point of Contact	Author Status	OECD Status
LXR Activation to Liver Steatosis	KeyEvent	Agnes Aggy (send email)	Not under active development

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 KE.In many cases, individual species identified in these structured fields will be those for which the strongest evidence used in constructing the AOP was available in relation to this KE. More help

Life Stages

An indication of the the relevant life stage(s) for this KE. More help

Sex Applicability

An indication of the the relevant sex for this KE. More help

Evidence Supporting the Domain of Applicability

A description of the scientific basis for the indicated domains of applicability and the WoE calls (if provided). More help

References

List of the literature that was cited for this KE description. More help

↑ Liang et al. 2002
↑ Schultz et al. 2000
↑ Horton et al. 2002
↑ Shimano et al. 1999
↑ Liang et al. 2002
↑ Ishii et al. 2004
↑ Bécard et al. 2001
↑ Ferre 2007
↑ Fleischmann 1999