GO:0061365 positive regulation of triglyceride lipase activity: Lipid Mobilization Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0061365 describes any process that increases the activity of triglyceride lipase, the enzyme that hydrolyzes triglycerides into free fatty acids and glycerol.
• This regulatory process is central to lipid storage, lipolysis, and lipotoxicity in obesity and metabolic disease.
• Key regulators include ANGPTL3, ANGPTL4, ANGPTL8, LPL, and FGF21, which control triglyceride lipase activity in a tissue-specific manner.
• Dysregulation of triglyceride lipase activity contributes to non-alcoholic fatty liver disease, cardiovascular mortality, and cancer-associated immune dysfunction.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect causal roles of genes in this process.
• EDITGENE provides end-to-end CRISPR cell model and library screening services to study positive regulation of triglyceride lipase activity.
Description
Triglyceride lipase activity is the enzymatic capacity to hydrolyze triglycerides into free fatty acids and glycerol, a reaction fundamental to energy homeostasis. The Gene Ontology term GO:0061365, positive regulation of triglyceride lipase activity, captures all biological processes that increase this enzymatic activity, including transcriptional, post-transcriptional, and post-translational mechanisms. This term is critical for researchers studying lipid metabolism because it sits at the intersection of energy storage, mobilization, and lipotoxicity. Dysregulated triglyceride lipase activity is increasingly recognized as a driver of metabolic disorders such as non-alcoholic fatty liver disease (NAFLD), diabetes, and cardiovascular mortality. In cancer, cancer-associated adipocytes can mediate CD8+ T cell dysfunction via FGF21-driven lipolysis, highlighting the broader immunological relevance of this process. Understanding the positive regulation of triglyceride lipase activity therefore requires integrating molecular, cellular, and physiological data across multiple organ systems.
positive regulation of triglyceride lipase activity At A Glance
| GO ID | GO:0061365 |
|---|---|
| GO term | positive regulation of triglyceride lipase activity |
| Ontology | biological_process |
| Synonym | positive regulation of TAG activity |
| Major function | Increases the activity of triglyceride lipase, promoting triglyceride hydrolysis |
| Related processes | Lipid storage, lipolysis, lipotoxicity, energy homeostasis |
| Key regulators | ANGPTL3, ANGPTL4, ANGPTL8, LPL, FGF21 |
| Disease relevance | Obesity, NAFLD, diabetes, cardiovascular mortality, cancer |
What Is GO:0061365?
GO:0061365 is defined as any process that increases the activity of triglyceride lipase, an enzyme that catalyzes the hydrolysis of triglycerides into free fatty acids and glycerol. This term encompasses molecular events such as enzyme activation, increased expression, or enhanced substrate accessibility that collectively elevate triglyceride lipase activity.
Why Is positive regulation of triglyceride lipase activity Important in Cell Biology?
Positive regulation of triglyceride lipase activity is essential for maintaining energy balance and preventing lipotoxicity, as it controls the release of free fatty acids from triglyceride stores. Its dysregulation is implicated in obesity, non-alcoholic fatty liver disease, diabetes, and cardiovascular mortality, making it a high-priority target for metabolic research. In cancer, this process can influence immune cell function and tumor progression, further underscoring its broad biomedical importance.
• Controls energy mobilization from lipid stores during fasting and exercise.
• Prevents lipotoxicity by regulating free fatty acid release.
• Dysregulation contributes to non-alcoholic fatty liver disease progression.
• Modulates cardiovascular mortality risk through ANGPTL3/4/8 complexes.
• Influences diabetes and glucose homeostasis via ANGPTL3.
• Mediates cancer-associated adipocyte effects on CD8+ T cell dysfunction.
• Is a target for therapeutic intervention in metabolic syndrome.
• Provides mechanistic insights into lipid metabolism in immune cells.
• Serves as a biomarker for lipid disorders and inflammation.
• Enables CRISPR-based functional genomics of lipid regulatory networks.
What Happens During positive regulation of triglyceride lipase activity?
Triglyceride Substrate Mobilization
In simple terms: First, triglycerides stored in lipid droplets are made accessible to the lipase enzyme.
Positive regulation of triglyceride lipase activity begins with the mobilization of triglyceride substrates from lipid droplets, a process often triggered by hormonal signals such as catecholamines or fasting. This step involves the recruitment of lipases to the lipid droplet surface and the remodeling of the droplet membrane to facilitate enzyme access. In obesity, excessive lipid storage can overwhelm this mobilization capacity, leading to lipotoxicity.
Lipase Activation and Complex Assembly
In simple terms: The lipase enzyme is switched on and assembled into an active complex.
Triglyceride lipase activity is positively regulated by the assembly of enzyme complexes, including the well-characterized ANGPTL3/8 and ANGPTL4/8 complexes that modulate lipoprotein lipase (LPL) activity. These complexes can either inhibit or activate LPL depending on the tissue context, thereby fine-tuning triglyceride hydrolysis. FGF21 has also been shown to drive lipolysis in cancer-associated adipocytes, promoting free fatty acid release.
Post-translational Modification and Cofactor Recruitment
In simple terms: Chemical modifications and helper proteins enhance the lipase's activity.
Positive regulation often involves post-translational modifications such as phosphorylation and the recruitment of cofactors like apolipoproteins. For example, ANGPTL3 and ANGPTL4 are regulated by proteolytic processing and complex formation, which directly impact LPL activity. These modifications can rapidly alter lipase activity in response to metabolic demands.
Signal Transduction and Transcriptional Control
In simple terms: Cellular signals turn on genes that make more or more active lipase.
Hormonal and nutrient signals activate transcription factors such as farnesoid X receptor (FXR), which can upregulate genes involved in triglyceride lipase activity. Gypenosides ameliorate high-fat diet-induced non-alcoholic steatohepatitis via FXR activation, demonstrating the therapeutic potential of targeting this regulatory axis. Additionally, loss of STK11 suppresses lipid metabolism and attenuates KRAS-induced immunogenicity in non-small cell lung cancer, linking signaling pathways to lipase regulation.
Integration with Autophagy and Mitochondrial Respiration
In simple terms: The lipase process is connected to cellular recycling and energy production.
Autophagy sustains mitochondrial respiration and determines resistance to BRAF(V600E) inhibition in thyroid carcinoma cells, indicating that triglyceride lipase activity is integrated with autophagic and mitochondrial pathways. This crosstalk ensures that fatty acid release matches cellular energy needs and stress responses.
Key Genes Involved in GO:0061365 positive regulation of triglyceride lipase activity
The following genes and proteins are central to the positive regulation of triglyceride lipase activity, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ANGPTL3 | Inhibits LPL activity; regulates triglyceride levels | Target for hypertriglyceridemia and diabetes |
| ANGPTL4 | Modulates LPL activity via complex formation | Linked to cardiovascular mortality and inflammation |
| ANGPTL8 | Forms complexes with ANGPTL3/4 to regulate LPL | Biomarker for lipid disorders |
| LPL | Hydrolyzes triglycerides in lipoproteins | Central enzyme in triglyceride lipase activity |
| FGF21 | Drives lipolysis in cancer-associated adipocytes | Mediates CD8+ T cell dysfunction in cancer |
| STK11 | Suppresses lipid metabolism; loss attenuates KRAS immunogenicity | Lung cancer lipid metabolism |
| FXR | Transcriptional regulator of lipid metabolism | Target for NASH treatment |
| Kallistatin | Promotes NAFLD progression | Potential biomarker for NAFLD |
| BRAF | V600E mutation affects autophagy and mitochondrial respiration | Thyroid carcinoma resistance |
| ATGL | Catalyzes first step of triglyceride hydrolysis | Key lipase in lipolysis |
| HSL | Hydrolyzes diacylglycerols and monoacylglycerols | Regulated by phosphorylation |
| MGL | Hydrolyzes monoacylglycerols | Final step of lipolysis |
| Perilipin | Protects lipid droplets from lipases | Regulates lipase access |
| CGI-58 | Activates ATGL | Cofactor for lipolysis |
| G0S2 | Inhibits ATGL | Negative regulator of lipolysis |
| FSP27 | Promotes lipid droplet fusion | Regulates lipid storage |
| PPARα | Transcriptional regulator of lipid oxidation | Links lipolysis to gene expression |
How Is positive regulation of triglyceride lipase activity Regulated?
Positive regulation of triglyceride lipase activity is controlled by a network of hormonal, nutritional, and transcriptional signals. ANGPTL3, ANGPTL4, and ANGPTL8 form complexes that modulate LPL activity in a tissue-specific manner, with ANGPTL3/8 and ANGPTL4/8 complexes associated with LPL activity, diabetes, inflammation, and cardiovascular mortality. FGF21 drives lipolysis in cancer-associated adipocytes, linking metabolic stress to immune dysfunction. FXR activation by gypenosides ameliorates NASH, indicating transcriptional control of lipase activity. Loss of STK11 suppresses lipid metabolism and attenuates KRAS-induced immunogenicity, showing that oncogenic signaling can regulate this process. Autophagy sustains mitochondrial respiration and determines resistance to BRAF(V600E) inhibition, further integrating lipase regulation with cellular stress responses.
positive regulation of triglyceride lipase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ANGPTL3 | Hypertriglyceridemia, diabetes | KO and overexpression in hepatocytes |
| ANGPTL4 | Cardiovascular mortality, inflammation | Knock-in of human variants in mice |
| FGF21 | Cancer immune dysfunction | Cancer-associated adipocyte co-culture |
| STK11 | Non-small cell lung cancer | KO in KRAS-mutant lung cancer cells |
| BRAF | Thyroid carcinoma resistance | Point mutation V600E knock-in |
Metabolic Disorders: Obesity, NAFLD, and Diabetes
Dysregulated positive regulation of triglyceride lipase activity contributes to lipid storage, lipolysis, and lipotoxicity in obesity. Elevated Kallistatin promotes the occurrence and progression of non-alcoholic fatty liver disease, highlighting a role for this regulatory process in NAFLD. ANGPTL3 affects triglyceride regulation, glucose homeostasis, and diabetes, making it a therapeutic target. Associations of ANGPTL3/8 and ANGPTL4/8 complexes with LPL activity, diabetes, inflammation, and cardiovascular mortality further underscore the clinical relevance.
Cancer and Immune Dysfunction
Cancer-associated adipocytes mediate CD8+ T cell dysfunction via FGF21-driven lipolysis, linking triglyceride lipase activity to tumor immune evasion. Loss of STK11 suppresses lipid metabolism and attenuates KRAS-induced immunogenicity in non-small cell lung cancer, suggesting that lipase regulation influences immunotherapy responses. Autophagy sustains mitochondrial respiration and determines resistance to BRAF(V600E) inhibition in thyroid carcinoma cells, connecting lipase activity to drug resistance.
Cardiovascular Mortality
Circulating ANGPTL3, C-terminal domain-containing ANGPTL4, and ANGPTL3/8 and ANGPTL4/8 complexes are associated with LPL activity, diabetes, inflammation, and cardiovascular mortality. This positions positive regulation of triglyceride lipase activity as a key axis in cardiovascular risk stratification.
From positive regulation of triglyceride lipase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ANGPTL3 loss increase triglyceride lipase activity? | ANGPTL3 knockout hepatocytes |
| How does ANGPTL4 point mutation affect LPL binding? | Point mutation knock-in in adipocytes |
| Does FGF21 overexpression drive lipolysis in cancer? | FGF21 overexpression in cancer-associated adipocytes |
| Is STK11 loss sufficient to suppress lipid metabolism? | STK11 knockout in lung cancer cells |
| Does BRAF V600E mutation alter autophagy-dependent lipolysis? | BRAF V600E knock-in thyroid carcinoma cells |
| Can FXR activation rescue NASH-related lipase dysfunction? | FXR overexpression in hepatocytes |
How to Study the positive regulation of triglyceride lipase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Gene essentiality for lipase activity | Identify positive regulators |
| RNA-seq | Transcriptional changes | Pathway analysis after FXR activation |
| Proteomics | Protein complexes and modifications | ANGPTL3/8 complex detection |
| Lipase activity assay | Enzymatic hydrolysis of triglycerides | Validate KO/overexpression effects |
| Western blot | Protein expression and phosphorylation | Assess lipase activation |
| Immunofluorescence | Lipid droplet morphology | Visualize lipolysis |
| Metabolomics | Free fatty acid and glycerol levels | Quantify lipolysis flux |
| Autophagy flux assay | Autophagic degradation | Link lipolysis to autophagy |
CRISPR Knockout Screening
Genome-wide CRISPR knockout screens can identify genes that positively regulate triglyceride lipase activity, such as ANGPTL3, ANGPTL4, and STK11. These screens use pooled sgRNA libraries and selection based on lipid accumulation or lipolysis readouts.
Transcriptomics and RNA-seq
RNA-seq can quantify expression changes in lipase genes and regulators following perturbations such as FXR activation or STK11 loss. This method reveals transcriptional networks underlying positive regulation.
Proteomics and Complex Analysis
Proteomic approaches can detect ANGPTL3/8 and ANGPTL4/8 complexes and their association with LPL activity. These methods are essential for understanding post-translational regulation.
Functional Lipase Assays
Enzymatic assays measure triglyceride lipase activity directly in cell lysates or conditioned media, enabling validation of CRISPR perturbations. These assays are typically coupled with free fatty acid or glycerol quantification.
How CRISPR Can Be Used to Study GO:0061365 positive regulation of triglyceride lipase activity
Knockout
CRISPR knockout of genes such as ANGPTL3, ANGPTL4, or STK11 can reveal their causal role in positive regulation of triglyceride lipase activity. For example, STK11 knockout suppresses lipid metabolism and attenuates KRAS-induced immunogenicity.
Point Mutation
Point mutation knock-in models, such as BRAF V600E, can dissect how specific mutations alter autophagy-dependent lipolysis and drug resistance. These models are critical for understanding allele-specific effects.
Knock-in
Knock-in of human ANGPTL4 variants or tagged lipases allows precise tracking of protein localization and complex formation. This approach is useful for studying post-translational regulation.
Overexpression
Overexpression of FGF21 or FXR can drive lipolysis or ameliorate NASH, respectively, providing gain-of-function evidence for positive regulation. These models complement knockout studies.
How EDITGENE Supports positive regulation of triglyceride lipase activity Research
Researchers studying positive regulation of triglyceride lipase activity-related genes often need to determine whether a candidate gene is causally involved in lipid mobilization, lipolysis, or lipotoxicity. EDITGENE provides publication-ready CRISPR cell models and screening services to accelerate this discovery process.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of triglyceride lipase activity research.
Frequently Asked Questions About positive regulation of triglyceride lipase activity
What is GO:0061365 positive regulation of triglyceride lipase activity?
GO:0061365 is a Gene Ontology biological process term defined as any process that increases the activity of triglyceride lipase, the enzyme that hydrolyzes triglycerides into free fatty acids and glycerol.
What genes are involved in positive regulation of triglyceride lipase activity?
Key genes include ANGPTL3, ANGPTL4, ANGPTL8, LPL, FGF21, STK11, FXR, and BRAF, among others.
How does ANGPTL3 regulate triglyceride lipase activity?
ANGPTL3 inhibits lipoprotein lipase (LPL) activity, and its complexes with ANGPTL8 modulate triglyceride hydrolysis in a tissue-specific manner.
What diseases are linked to dysregulated triglyceride lipase activity?
Obesity, non-alcoholic fatty liver disease, diabetes, cardiovascular mortality, and cancer-associated immune dysfunction are linked to dysregulation of this process.
How can CRISPR be used to study positive regulation of triglyceride lipase activity?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of genes such as ANGPTL3, STK11, and BRAF in lipid metabolism.
What is the role of FGF21 in triglyceride lipase activity?
FGF21 drives lipolysis in cancer-associated adipocytes, mediating CD8+ T cell dysfunction.
How does STK11 loss affect lipid metabolism?
Loss of STK11 suppresses lipid metabolism and attenuates KRAS-induced immunogenicity in non-small cell lung cancer.
What experimental models are used to study this GO term?
Knockout, point mutation, knock-in, and overexpression cell models, as well as CRISPR screens and lipase activity assays, are commonly used.
What is the relationship between autophagy and triglyceride lipase activity?
Autophagy sustains mitochondrial respiration and determines resistance to BRAF(V600E) inhibition, linking lipolysis to autophagic pathways.
How does FXR activation affect triglyceride lipase activity?
FXR activation by gypenosides ameliorates high-fat diet-induced non-alcoholic steatohepatitis, indicating transcriptional control of lipid metabolism.
Conclusion
GO:0061365 positive regulation of triglyceride lipase activity is a central biological process that governs lipid mobilization and energy homeostasis. Its dysregulation is implicated in obesity, NAFLD, diabetes, cardiovascular mortality, and cancer immune dysfunction. Advances in CRISPR modeling and functional genomics are enabling precise dissection of the genes and pathways that control this process. EDITGENE offers comprehensive services to support researchers in this rapidly evolving field.
References
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- 3. Dalangood S et al.. 2025. Cancer-associated adipocytes mediate CD8(+)T cell dysfunction via FGF21-driven lipolysis.. Cell Rep 44(11):116526 PMID: 41191487
- 4. Li H et al.. 2022. Gypenosides ameliorate high-fat diet-induced non-alcoholic steatohepatitis via farnesoid X receptor activation.. Front Nutr 9:914079 PMID: 36091227
- 5. Christopoulou E et al.. 2019. Effects of Angiopoietin-Like 3 on Triglyceride Regulation, Glucose Homeostasis, and Diabetes.. Dis Markers 2019:6578327 PMID: 30944669
- 6. Principe DR et al.. 2024. Loss of STK11 Suppresses Lipid Metabolism and Attenuates KRAS-Induced Immunogenicity in Patients with Non-Small Cell Lung Cancer.. Cancer Res Commun 4(8):2282-2294 PMID: 39113608
- 7. Silbernagel G et al.. 2025. Associations of Circulating ANGPTL3, C-Terminal Domain-Containing ANGPTL4, and ANGPTL3/8 and ANGPTL4/8 Complexes with LPL Activity, Diabetes, Inflammation, and Cardiovascular Mortality.. Circulation 151(3):218-234 PMID: 39392008
- 8. Díaz-Gago S et al.. 2024. Autophagy sustains mitochondrial respiration and determines resistance to BRAF(V600E) inhibition in thyroid carcinoma cells.. Autophagy 20(6):1383-1397 PMID: 38436206
