GO:0010886 positive regulation of cholesterol storage: Lipid Droplet Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0010886 describes any process that increases the rate or extent of cholesterol storage, the accumulation and maintenance of cholest-5-en-3 beta-ol in cells or tissues.
• Cholesterol storage is dynamically regulated by dietary fatty acids, especially trans fatty acids, which can alter both cholesterol synthesis and esterification.
• ACAT1-positive late endosomes and lipid droplets are central organelles for cholesterol sequestration in macrophages and other cell types.
• Tumor cells frequently reprogram cholesterol uptake and storage to support proliferation and immune evasion, making this process a cancer-relevant target.
• Key genes include ACAT1, SOAT1, SLC27A3, PINK1, BACE2, and STAT2, which modulate cholesterol esterification, mitophagy, and lipid transporter shedding.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of positive regulation of cholesterol storage in disease contexts.
Description
Cholesterol is an essential sterol in vertebrates, serving as a structural component of membranes and a precursor for bile acids and steroid hormones. Cells maintain cholesterol homeostasis through a balance of synthesis, uptake, efflux, and storage. GO:0010886, positive regulation of cholesterol storage, refers to any process that increases the rate or extent of cholesterol accumulation and maintenance in cells or tissues. This biological process is critical for understanding how cells handle excess cholesterol and how dysregulation contributes to disease. The regulation of cholesterol synthesis and storage in fat cells was recognized decades ago as a key metabolic control point. Dietary fatty acids, particularly trans fatty acids, can modulate plasma LDL cholesterol concentrations and cellular cholesterol storage, linking nutrition to this process. In macrophages, ACAT1-positive late endosomes play a central role in cholesterol metabolism and are implicated in Niemann-Pick disease type C, a lysosomal storage disorder. More recently, cancer studies have shown that cholesterol uptake and storage support tumor proliferation and immune modulation, with genes such as SLC27A3, PINK1, and BACE2 participating in these pathways. Understanding positive regulation of cholesterol storage therefore spans metabolic biology, neurodegeneration, and oncology.
positive regulation of cholesterol storage At A Glance
| GO ID | GO:0010886 |
|---|---|
| GO term | positive regulation of cholesterol storage |
| Ontology | biological_process |
| Synonym | positive regulation of cholesterol sequestration |
| Major function | Increases the rate or extent of cholesterol accumulation and maintenance in cells or tissues |
| Related process | Cholesterol storage (GO:0010885) |
| Key organelles | Lipid droplets, late endosomes, lysosomes |
| Key enzymes | ACAT1/SOAT1, SLC27A3, PINK1, BACE2 |
| Disease relevance | Niemann-Pick disease type C, cancer, metabolic disorders |
What Is GO:0010886?
Positive regulation of cholesterol storage (GO:0010886) is defined as any process that increases the rate or extent of cholesterol storage. Cholesterol storage itself is the accumulation and maintenance of cholesterol, cholest-5-en-3 beta-ol, the principal sterol of vertebrates and the precursor of many steroids, including bile acids and steroid hormones. This process typically involves the esterification of cholesterol by enzymes such as ACAT1/SOAT1 and the packaging of cholesteryl esters into lipid droplets or late endosomal compartments. Positive regulation can occur through increased cholesterol uptake, enhanced esterification, or reduced cholesterol efflux, and is influenced by dietary factors such as trans fatty acids.
Why Is positive regulation of cholesterol storage Important in Cell Biology?
Positive regulation of cholesterol storage is important because excessive cholesterol accumulation is a hallmark of several human diseases, including atherosclerosis, Niemann-Pick disease type C, and cancer. In macrophages, ACAT1-positive late endosomes regulate cholesterol esterification and storage, and their dysfunction leads to cholesterol sequestration in lysosomes. In cancer, cholesterol uptake and storage support rapid proliferation and modulate immune features, with pan-cancer analyses linking cholesterol metabolism to KRAS pathway activity. Additionally, trans fatty acids and dietary fatty acids can influence cholesterol storage and plasma LDL levels, highlighting the impact of nutrition on this process. Understanding the molecular players that positively regulate cholesterol storage may reveal therapeutic targets for metabolic and neoplastic diseases.
• Cholesterol storage is essential for membrane synthesis and steroid hormone production in vertebrates.
• Dysregulated cholesterol storage contributes to Niemann-Pick disease type C and other lysosomal storage disorders.
• Trans fatty acids increase LDL cholesterol and alter cholesterol storage, linking diet to cardiovascular risk.
• Cancer cells reprogram cholesterol uptake and storage to support proliferation and immune evasion.
• ACAT1/SOAT1-mediated esterification is a key node in positive regulation of cholesterol storage.
• Mitophagy-related proteins such as PINK1 and SLC27A3 remodel lipid metabolism in clear cell renal cell carcinoma.
• BACE2 tunes lipid uptake through lipid transporter shedding, affecting cancer cell proliferation.
• Pan-cancer analysis reveals cholesterol uptake as a modulator of tumor immune features and KRAS signaling.
• FGF21 neuroendocrine actions may influence lipid metabolism, including cholesterol storage.
• CRISPR-based models enable causal testing of genes that positively regulate cholesterol storage.
What Happens During positive regulation of cholesterol storage?
Cholesterol Uptake and Transport
In simple terms: Cells take in cholesterol from outside and move it to storage sites.
Positive regulation of cholesterol storage often begins with increased uptake of cholesterol from lipoproteins or the extracellular environment. BACE2 has been shown to tune lipid uptake through shedding of lipid transporters, supporting cancer cell proliferation. In clear cell renal cell carcinoma, STAT2/SLC27A3/PINK1-mediated mitophagy remodels lipid metabolism, which can influence cholesterol handling. Pan-cancer analyses further indicate that cholesterol uptake modulates tumor immune features and KRAS pathway activity.
Cholesterol Esterification
In simple terms: Enzymes convert free cholesterol into a storable ester form.
Esterification of cholesterol by ACAT1 (also known as SOAT1) is a central step in cholesterol storage. ACAT1-positive late endosomes in macrophages are key sites for cholesterol esterification and storage, and their role in Niemann-Pick disease type C has been documented. This enzymatic conversion reduces free cholesterol toxicity and facilitates packaging into lipid droplets.
Lipid Droplet Formation and Maintenance
In simple terms: Stored cholesterol is kept in fat droplets inside the cell.
Cholesteryl esters are packaged into lipid droplets, which serve as intracellular storage depots. The regulation of cholesterol synthesis and storage in fat cells was described decades ago, highlighting the dynamic nature of this process. Positive regulation increases the number or size of these storage compartments, maintaining cholesterol in an esterified, inert form.
Inhibition of Cholesterol Efflux
In simple terms: Cells reduce the removal of cholesterol to keep more inside.
Positive regulation of cholesterol storage can also occur by decreasing cholesterol efflux. Although direct evidence for efflux inhibition in the context of GO:0010886 is limited in the provided citations, the balance between uptake, esterification, and efflux determines net storage. Dietary trans fatty acids have been shown to alter plasma LDL cholesterol concentrations, indirectly affecting cellular cholesterol pools.
Mitophagy and Lipid Metabolism Crosstalk
In simple terms: Recycling of mitochondria can change how cells store fat.
Mitophagy, the selective degradation of mitochondria, is linked to lipid metabolism remodeling. In clear cell renal cell carcinoma, STAT2/SLC27A3/PINK1-mediated mitophagy contributes to pazopanib resistance by remodeling lipid metabolism, which may include changes in cholesterol storage. This crosstalk highlights how positive regulation of cholesterol storage can be influenced by mitochondrial quality control pathways.
Key Genes Involved in GO:0010886 positive regulation of cholesterol storage
The following genes and proteins have been experimentally linked to positive regulation of cholesterol storage or related lipid metabolic processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ACAT1 (SOAT1) | Cholesterol esterification in late endosomes | Niemann-Pick disease type C, macrophage cholesterol storage |
| SLC27A3 | Fatty acid transport and lipid metabolism | Mitophagy remodeling in clear cell renal cell carcinoma |
| PINK1 | Mitophagy regulation | Lipid metabolism remodeling and drug resistance |
| STAT2 | Transcription factor in interferon signaling | Regulates SLC27A3/PINK1 axis in cancer |
| BACE2 | Protease that sheds lipid transporters | Tunes lipid uptake in cancer cells |
| FGF21 | Neuroendocrine hormone | Potential regulator of lipid metabolism in primates |
| KRAS | Oncogenic GTPase | Cholesterol uptake modulates KRAS pathway in pan-cancer analysis |
| LDLR | Low-density lipoprotein receptor | Mediates cholesterol uptake from plasma |
| ABCA1 | Cholesterol efflux transporter | Opposes cholesterol storage by promoting efflux |
| ABCG1 | Cholesterol efflux transporter | Contributes to reverse cholesterol transport |
| NPC1 | Lysosomal cholesterol transporter | Defective in Niemann-Pick disease type C |
| NPC2 | Lysosomal cholesterol binding protein | Defective in Niemann-Pick disease type C |
| SREBP2 | Master transcription factor for cholesterol synthesis | Regulates cholesterol homeostasis |
| HMGCR | Rate-limiting enzyme in cholesterol synthesis | Target of statins, affects cholesterol pools |
| CYP7A1 | Cholesterol 7-alpha-hydroxylase | Converts cholesterol to bile acids |
| STAR | Steroidogenic acute regulatory protein | Transports cholesterol to mitochondria for steroidogenesis |
| LRP1 | LDL receptor-related protein 1 | Participates in lipoprotein uptake |
How Is positive regulation of cholesterol storage Regulated?
Positive regulation of cholesterol storage is controlled at multiple levels. Transcriptional regulation by SREBP2 increases expression of cholesterol synthesis and uptake genes, indirectly promoting storage when cholesterol is abundant. Post-translational regulation of ACAT1/SOAT1 activity determines the rate of esterification and lipid droplet formation. Dietary trans fatty acids can alter cholesterol synthesis and storage in fat cells, as well as plasma LDL concentrations, linking nutritional status to this process. In cancer, mitophagy-related proteins such as PINK1 and SLC27A3 remodel lipid metabolism, potentially affecting cholesterol storage and drug resistance. Additionally, BACE2-mediated shedding of lipid transporters tunes lipid uptake, which can influence cholesterol storage in cancer cells. FGF21 may also exert neuroendocrine actions that affect lipid metabolism, though its direct role in cholesterol storage requires further study.
positive regulation of cholesterol storage and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ACAT1 (SOAT1) | Niemann-Pick disease type C, atherosclerosis | ACAT1 knockout macrophages, knock-in of patient mutations |
| SLC27A3 | Clear cell renal cell carcinoma, pazopanib resistance | SLC27A3 knockout or overexpression in ccRCC cell lines |
| PINK1 | Mitophagy-related lipid remodeling, cancer drug resistance | PINK1 knockout and rescue in cancer cells |
| BACE2 | Cancer cell proliferation, lipid uptake | BACE2 knockout or overexpression in cancer models |
| KRAS | Pan-cancer cholesterol metabolism and immune modulation | KRAS mutant knock-in cell lines with cholesterol uptake modulation |
Niemann-Pick Disease Type C
Niemann-Pick disease type C is a lysosomal storage disorder characterized by defective cholesterol trafficking. ACAT1-positive late endosomes play a role in cholesterol metabolism, and their dysfunction contributes to cholesterol sequestration in macrophages and other cells. Positive regulation of cholesterol storage may be maladaptive in this context, exacerbating lysosomal cholesterol accumulation.
Cancer
Many cancers reprogram cholesterol metabolism to support proliferation and survival. Pan-cancer analysis reveals that cholesterol uptake modulates tumor immune features and KRAS pathway activity. BACE2 tunes lipid uptake through lipid transporter shedding, supporting cancer cell proliferation. In clear cell renal cell carcinoma, STAT2/SLC27A3/PINK1-mediated mitophagy remodels lipid metabolism and contributes to pazopanib resistance. These findings suggest that positive regulation of cholesterol storage is co-opted by tumors.
Metabolic and Cardiovascular Disorders
Dietary fatty acids, especially trans fatty acids, regulate plasma LDL cholesterol concentrations and cholesterol storage in fat cells. Excessive cholesterol storage in macrophages is a hallmark of atherosclerosis, and ACAT1 activity influences foam cell formation. Thus, positive regulation of cholesterol storage is directly relevant to cardiovascular risk.
From positive regulation of cholesterol storage-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ACAT1 reduce cholesterol storage? | ACAT1 knockout cell line (e.g., macrophages) |
| Does a point mutation in SLC27A3 affect mitophagy and lipid metabolism? | SLC27A3 point-mutation knock-in in ccRCC cells |
| Does PINK1 overexpression increase cholesterol storage? | PINK1 overexpression in cancer cell lines |
| Does BACE2 shedding regulate lipid uptake? | BACE2 tagged knock-in for shedding assays |
| Does KRAS mutation alter cholesterol uptake? | KRAS mutant knock-in in immortalized cells |
| Can CRISPR library screening identify new regulators of cholesterol storage? | Genome-wide CRISPR knockout library in lipid-storage reporter cells |
How to Study the positive regulation of cholesterol storage Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Filipin staining | Free cholesterol accumulation | Screening for cholesterol storage phenotypes |
| Lipidomics (LC-MS) | Cholesterol and cholesteryl ester species | Quantifying storage in knockout cells |
| CRISPR knockout library | Gene essentiality for cholesterol storage | Genome-wide screens |
| RNA-seq | Transcriptional changes in lipid genes | Pathway analysis after perturbation |
| Proteomics | Protein abundance and modifications | Identifying regulators of cholesterol storage |
| Immunofluorescence | Subcellular localization of ACAT1, NPC1 | Validating late endosome involvement |
| Mitophagy assays | Mitochondrial degradation | Linking PINK1 to lipid metabolism |
| Lipoprotein uptake assays | Cholesterol influx | Measuring BACE2-mediated shedding effects |
CRISPR Knockout Screening
Genome-wide CRISPR knockout screens can identify genes that positively regulate cholesterol storage. Cells are infected with a lentiviral sgRNA library, selected, and then stained with cholesterol-binding dyes such as filipin to sort populations with altered storage. Hits can be validated individually, as demonstrated in studies of lipid metabolism and drug resistance.
Lipidomics and Cholesterol Quantification
Mass spectrometry-based lipidomics and enzymatic cholesterol assays quantify free and esterified cholesterol. These methods measure the extent of cholesterol storage and can be combined with stable isotope labeling to trace cholesterol flux. ACAT1 activity can be assessed by measuring cholesteryl ester formation.
Imaging of Lipid Droplets and Late Endosomes
Fluorescence microscopy with filipin or BODIPY-cholesterol visualizes cholesterol storage compartments. Immunostaining for ACAT1 or late endosome markers (e.g., LAMP1) reveals colocalization. Live-cell imaging can track lipid droplet dynamics in response to genetic perturbations.
Transcriptomics and Proteomics
RNA-seq and proteomics identify expression changes in cholesterol metabolism genes upon perturbation. Pathway analysis can reveal whether positive regulation of cholesterol storage is affected. For example, STAT2/SLC27A3/PINK1-mediated mitophagy remodeling was uncovered using such approaches.
How CRISPR Can Be Used to Study GO:0010886 positive regulation of cholesterol storage
Knockout
CRISPR knockout of genes such as ACAT1, SLC27A3, or PINK1 can abolish their function and test whether they are required for positive regulation of cholesterol storage. For example, ACAT1 knockout macrophages show reduced cholesteryl ester formation and altered cholesterol trafficking. SLC27A3 or PINK1 knockout in cancer cells can reverse mitophagy-mediated lipid remodeling.
Point Mutation
Point mutations can mimic disease-associated variants or disrupt catalytic residues. For instance, introducing a point mutation in SLC27A3 or PINK1 can dissect domain-specific functions in lipid metabolism. Such models are valuable for understanding how subtle genetic changes affect cholesterol storage.
Knock-in
Knock-in of tagged versions of ACAT1 or BACE2 allows tracking of protein localization and shedding. Tagged knock-in of BACE2 can reveal how it sheds lipid transporters to tune lipid uptake. Knock-in of patient mutations in NPC1 or NPC2 can model Niemann-Pick disease type C.
Overexpression
Overexpression of genes such as BACE2 or PINK1 can drive increased cholesterol storage or lipid uptake. BACE2 overexpression enhances lipid transporter shedding and supports cancer cell proliferation. PINK1 overexpression may amplify mitophagy and remodel lipid metabolism. These models help establish sufficiency.
How EDITGENE Supports positive regulation of cholesterol storage Research
Researchers studying positive regulation of cholesterol storage-related genes often need to determine whether a candidate gene is causally involved in cholesterol accumulation, esterification, or lipid droplet dynamics. EDITGENE provides comprehensive CRISPR-based services to generate knockout, point-mutation, knock-in, and overexpression cell models, as well as library screening and bioinformatics support, enabling rigorous functional dissection of GO:0010886.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of cholesterol storage research.
Frequently Asked Questions About positive regulation of cholesterol storage
What is GO:0010886 positive regulation of cholesterol storage?
GO:0010886 is a Gene Ontology biological process term defined as any process that increases the rate or extent of cholesterol storage, the accumulation and maintenance of cholesterol in cells or tissues.
What genes are involved in positive regulation of cholesterol storage?
Key genes include ACAT1 (SOAT1), SLC27A3, PINK1, STAT2, BACE2, and KRAS, which regulate cholesterol esterification, mitophagy, lipid uptake, and tumor metabolism.
How is cholesterol storage regulated in cells?
Cholesterol storage is regulated by a balance of uptake, esterification by ACAT1, lipid droplet formation, and efflux. Dietary trans fatty acids and mitophagy-related proteins can also modulate this process.
What diseases are associated with abnormal cholesterol storage?
Niemann-Pick disease type C, atherosclerosis, and various cancers are associated with dysregulated cholesterol storage.
What is the role of ACAT1 in cholesterol storage?
ACAT1 (SOAT1) esterifies cholesterol in late endosomes, promoting storage as cholesteryl esters and contributing to Niemann-Pick disease type C pathology.
How can CRISPR be used to study cholesterol storage?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of genes like SLC27A3, PINK1, and BACE2 in cholesterol storage pathways.
What methods measure cholesterol storage?
Filipin staining, lipidomics, immunofluorescence, and lipoprotein uptake assays are commonly used to quantify cholesterol storage and its regulation.
Is positive regulation of cholesterol storage important in cancer?
Yes, many cancers reprogram cholesterol uptake and storage to support proliferation and immune evasion, with KRAS pathway involvement.
What is the difference between cholesterol storage and cholesterol synthesis?
Cholesterol synthesis is the production of new cholesterol, while cholesterol storage is the accumulation and maintenance of cholesterol, often as cholesteryl esters in lipid droplets.
Can diet affect positive regulation of cholesterol storage?
Dietary fatty acids, especially trans fatty acids, can alter cholesterol synthesis, storage in fat cells, and plasma LDL cholesterol concentrations.
Conclusion
Positive regulation of cholesterol storage (GO:0010886) is a fundamental biological process that controls the accumulation and maintenance of cholesterol in cells. It is orchestrated by a network of genes including ACAT1, SLC27A3, PINK1, BACE2, and KRAS, and is dysregulated in Niemann-Pick disease type C, cancer, and cardiovascular disorders. Understanding the molecular mechanisms of this process offers opportunities for therapeutic intervention. EDITGENE provides comprehensive CRISPR services to generate knockout, point-mutation, knock-in, and overexpression models, as well as library screening and bioinformatics support, empowering researchers to dissect the causal roles of genes in cholesterol storage and related diseases.
References
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- 4. Dietschy JM. 1998. Dietary fatty acids and the regulation of plasma low density lipoprotein cholesterol concentrations.. J Nutr 128(2 Suppl):444S-448S PMID: 9478045
- 5. Sakashita N et al.. 2014. Role of ACAT1-positive late endosomes in macrophages: cholesterol metabolism and therapeutic applications for Niemann-Pick disease type C.. J Med Invest 61(3-4):270-7 PMID: 25264044
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- 8. Machado AL et al.. 2026. Pan-cancer analysis of cholesterol metabolism reveals the uptake as a modulator of tumor immune features and of the KRAS pathway.. Cell Oncol (Dordr) 49(1):45 PMID: 41677991
