Related Experiment Video
Updated: May 3, 2026
08:14
A High-Throughput Luciferase Assay to Evaluate Proteolysis of the Single-Turnover Protease PCSK9
Published on: August 28, 2018
7.3K
The hypercholesterolemia-risk gene SORT1 facilitates PCSK9 secretion.
Camilla Gustafsen1, Mads Kjolby2, Mette Nyegaard3
1The Lundbeck Foundation Research Center, MIND, Department of Biomedicine, Aarhus University, Vennelyst Boulevard 4, DK-8000 C Aarhus, Denmark.
Cell Metabolism
|February 11, 2014
Summary
Sortilin acts as a receptor for PCSK9, a protein that increases LDL cholesterol. This finding reveals a new mechanism regulating PCSK9 secretion and offers potential therapeutic targets for hypercholesterolemia.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Circulating PCSK9 promotes LDL receptor degradation, elevating LDL cholesterol levels.
- PCSK9 is a key drug target for hypercholesterolemia, with promising clinical trial outcomes.
- The precise intracellular mechanisms governing PCSK9 activity are not fully understood.
Purpose of the Study:
- To identify novel proteins involved in the regulation of PCSK9 secretion.
- To elucidate the role of sortilin in PCSK9 trafficking and activity.
Main Methods:
- Investigated the interaction between sortilin and PCSK9 using cell biology techniques.
- Utilized sortilin-deficient mice and liver-specific sortilin overexpression models.
- Analyzed the correlation between circulating PCSK9 and sortilin levels in a human cohort.
Main Results:
- Identified sortilin as a high-affinity binding partner for PCSK9.
- Demonstrated that sortilin colocalizes with PCSK9 and facilitates its secretion from hepatocytes.
- Sortilin deficiency in mice reduced circulating PCSK9, while overexpression increased it.
- Observed a positive correlation between circulating PCSK9 and sortilin in humans.
Conclusions:
- Sortilin is a critical regulator of PCSK9 secretion and activity.
- Findings suggest sortilin's involvement in human PCSK9 regulation.
- Establishes a novel molecular pathway influencing cholesterol metabolism.
Related Concept Videos
01:29Pharmacogenomics: Identification of New Drug Targets
121
Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
121
01:29Cholesterol: Significance and Regulation
2.1K
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Considering cholesterol and...
2.1K
01:16Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters
189
The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
189
01:20Lipid-Lowering Drugs: Statins and Miscellaneous Agents
1.7K
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...
1.7K
01:33Pleiotropy
31.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
31.2K
01:45Regulation of Nuclear Protein Sorting
2.5K
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...
2.5K