Related Experiment Video
Updated: Dec 4, 2025
11:27
Analysis of SCAP N-glycosylation and Trafficking in Human Cells
Published on: November 8, 2016
9.2K
Dipyridamole Inhibits Lipogenic Gene Expression by Retaining SCAP-SREBP in the Endoplasmic Reticulum.
Ryan M Esquejo1, Manuel Roqueta-Rivera1, Wei Shao2
1Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL 32827, USA.
Cell Chemical Biology
|October 23, 2020
Summary
Dipyridamole blocks the movement of sterol regulatory element-binding proteins (SREBPs) from the ER to the Golgi. This action, independent of its PDE inhibition, impacts lipid metabolism and SREBP gene expression.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Sterol regulatory element-binding proteins (SREBPs) control lipid metabolism and the mevalonate pathway.
- SREBPs are retained in the endoplasmic reticulum (ER) via a complex with SCAP and INSIG.
- Dysregulation of SREBPs is linked to metabolic disorders, making them therapeutic targets.
Purpose of the Study:
- To elucidate the mechanism by which dipyridamole affects SREBP nuclear accumulation.
- To investigate the effect of dipyridamole on the ER-to-Golgi transport of the SCAP-SREBP complex.
- To determine if dipyridamole's impact on SREBP is related to its phosphodiesterase (PDE) inhibitory activity.
Main Methods:
- Cellular assays to track SCAP-SREBP complex localization.
- Analysis of SREBP nuclear translocation.
- Biochemical assays to assess PDE activity.
Main Results:
- Dipyridamole selectively inhibits the ER-to-Golgi transport of the SCAP-SREBP complex.
- This inhibition occurs independently of dipyridamole's phosphodiesterase (PDE) inhibitory activity.
- Dipyridamole treatment leads to reduced nuclear accumulation of SREBP.
Conclusions:
- Dipyridamole's mechanism for limiting SREBP nuclear accumulation involves blocking ER-to-Golgi transport.
- This finding offers new insights into targeting lipid metabolism disorders.
- The study identifies a novel, non-PDE-related mechanism for dipyridamole's action on SREBP regulation.
Related Concept Videos
01:45Regulation of Nuclear Protein Sorting
3.0K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
3.0K
01:58Cell Specific Gene Expression
15.3K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
15.3K
01:20Lipid-Lowering Drugs: Statins and Miscellaneous Agents
1.2K
Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
1.2K
01:25Lipid Catabolism
598
Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
598