Key Event Title
|Level of Biological Organization|
Key Event Components
|fatty acid biosynthetic process||fatty acid||increased|
Key Event Overview
AOPs Including This Key Event
|AOP Name||Role of event in AOP|
|LXR Activation to Liver Steatosis||KeyEvent|
Key Event Description
A number of pathways and a great number of enzymes like GK, L-PK, ACC, FAS and SCD-1 are involved in the de novo FA synthesis . As it is already discussed above these enzymes are induced by LXR agonists (FAS, SCD1), the SREBP-1c (GK, ACC, FAS) and the ChREBP (L-PK, ACC, FAS) leading to enhancement of the de novo FA synthesis.
Figure 1. Metabolic pathway for de novo FA synthesis and TG formation 
As proposed from Diraison et al 1997 the de novo FA synthesis contributes maximum 5% to the synthesis of FA and TG under normal conditions. Conditions associated with high rates of lipogenesis, such as low fat - high carbohydrate (LF/HC) diet, hyperglycemia, and hyperinsulinemia are associated with a shift in cellular metabolism from lipid oxidation to TG esterification, thereby increasing the availability of TGs derived from VLDL synthesis and secretion.
How It Is Measured or Detected
Domain of Applicability
- Postic & Girard 2008