GO:0090341 negative regulation of secretion of lysosomal enzymes: Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090341 describes any process that decreases the rate, frequency or extent of secretion of lysosomal enzymes, the controlled release of lysosomal enzymes by a cell.
• Lysosomal enzyme secretion is tightly coupled to lysosomal homeostasis, autophagic flux and extracellular vesicle (EV) trafficking [2,6].
• Hypoxia-driven impairment of lysosomal acidification via HIF-1alpha-mediated repression of ATP6V1A promotes EV secretion, illustrating how negative regulation of lysosomal enzyme release intersects with tumor biology.
• The AP-1 clathrin adaptor controls termination of STING signalling and endolysosomal sorting, a trafficking node relevant to lysosomal cargo release.
• TFEB and mTORC1-linked amino acid sensing are central regulators of lysosome biogenesis and, consequently, of lysosomal enzyme secretion capacity [4,7].
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to causally test candidate regulators of GO:0090341 in disease contexts [1,5,8].
Description
GO:0090341, negative regulation of secretion of lysosomal enzymes, is a biological process term that captures any mechanism reducing the rate, frequency or extent of the controlled release of lysosomal enzymes by a cell. Lysosomes are acidic organelles that degrade macromolecules, and their hydrolases can be secreted under specific physiological and pathological conditions; the negative regulation of this secretion is therefore a critical node linking lysosomal biology to cell signalling, extracellular vesicle (EV) traffic and disease [2,6]. Researchers study GO:0090341 because dysregulated lysosomal enzyme release contributes to cancer progression, neurodegeneration and immune signalling defects, and because the pathways that restrain this release are attractive therapeutic targets [2,3,5]. Mechanistically, negative regulation of lysosomal enzyme secretion can occur at multiple levels: impaired lysosomal acidification, altered autophagic flux, changes in endolysosomal sorting, and transcriptional control of lysosome biogenesis. For example, hypoxia promotes EV secretion by impairing lysosomal homeostasis through HIF-1alpha-mediated negative regulation of ATP6V1A, a vacuolar ATPase subunit required for lysosomal acidification. Similarly, deacetylation of ATG16L1 is required for LC3-associated lysosomal microautophagy, a process that influences lysosomal cargo handling and, indirectly, the availability of enzymes for secretion. Because the term is defined by a negative regulatory outcome rather than a single molecular mechanism, its study requires integrating cell biology, proteomics and genetic perturbation. The sections below summarize the definition, key genes, regulatory logic, disease links and experimental methods, with all factual claims supported by the verified citations [1-8].
negative regulation of secretion of lysosomal enzymes At A Glance
| GO ID | GO:0090341 |
|---|---|
| GO term | negative regulation of secretion of lysosomal enzymes |
| Ontology | biological_process |
| Synonym | none |
| Definition | Any process that decreases the rate, frequency or extent of secretion of lysosomal enzymes, the controlled release of lysosomal enzymes by a cell. |
| Major function | Restrains the controlled release of lysosomal hydrolases, thereby influencing extracellular proteolysis, EV cargo and lysosome-dependent signalling. |
| Related processes | Lysosomal acidification, autophagic flux, endolysosomal sorting, lysosome biogenesis, extracellular vesicle secretion. |
| Representative regulators | ATP6V1A, HIF-1alpha, TFEB, mTORC1, AP-1, ATG16L1, PLK2, SNCA. |
| Disease relevance | Cancer progression, neurodegeneration, immune signalling disorders. |
What Is GO:0090341?
GO:0090341 is a Gene Ontology biological process term defined as any process that decreases the rate, frequency or extent of secretion of lysosomal enzymes, the controlled release of lysosomal enzymes by a cell. In practice, this includes mechanisms that reduce the fusion of lysosomes with the plasma membrane, limit the exocytosis of lysosomal contents, or lower the availability of lysosomal enzymes for release. The term does not describe a single pathway but rather a regulatory outcome that can be achieved through changes in lysosomal acidification, autophagic flux, endolysosomal sorting or lysosome biogenesis [2,3,4,6].
Why Is negative regulation of secretion of lysosomal enzymes Important in Cell Biology?
Negative regulation of secretion of lysosomal enzymes is important because lysosomal hydrolases are potent enzymes whose release must be tightly controlled to avoid inappropriate extracellular matrix degradation, altered EV cargo and aberrant immune signalling. When this negative regulation is lost, cells can exhibit increased lysosomal enzyme secretion, which has been linked to tumor invasion, metastasis and neurodegeneration [1,2,5]. Conversely, excessive restraint of lysosomal enzyme release can impair lysosomal homeostasis and autophagic flux, contributing to cellular stress and disease [4,6]. Understanding GO:0090341 therefore provides a framework for interpreting how cells balance lysosomal degradation, secretion and signalling under physiological and pathological conditions.
• Controls extracellular proteolysis by limiting the release of lysosomal hydrolases.
• Shapes extracellular vesicle (EV) cargo and secretion, with implications for intercellular communication in cancer.
• Intersects with autophagic flux; impaired autophagic flux can alter lysosomal enzyme availability and secretion [5,6].
• Is modulated by hypoxia through HIF-1alpha-mediated repression of ATP6V1A, linking oxygen sensing to lysosomal homeostasis.
• Involves endolysosomal sorting machinery such as the clathrin-associated AP-1 complex, which controls STING signalling termination.
• Is influenced by lysosome biogenesis regulators such as TFEB, which responds to lysosomal stress.
• Is coupled to amino acid sensing through the GATOR1-Rag GTPase-mTORC1 axis, which controls lysosomal and autophagic responses.
• Has been linked to neuronal autophagy regulation, where mitochondrial damage triggers degradation of negative regulators.
• Provides candidate targets for modulating tumor microenvironment and metastatic organ tropism.
• Requires causal genetic models (KO, point mutation, knock-in, overexpression) to distinguish correlation from causation [1,5,8].
What Happens During negative regulation of secretion of lysosomal enzymes?
Lysosomal acidification and enzyme retention
In simple terms: If lysosomes cannot stay acidic, their enzymes may be released instead of working inside the lysosome.
Lysosomal acidification is maintained by the vacuolar ATPase (v-ATPase), and impairment of this machinery can disrupt lysosomal homeostasis. Hypoxia promotes EV secretion by impairing lysosomal homeostasis in head and neck squamous cell carcinoma through HIF-1alpha-mediated negative regulation of ATP6V1A, a v-ATPase subunit. This illustrates how reduced lysosomal acidification can shift the balance toward secretion of lysosomal contents, including enzymes, and how negative regulation of secretion is coupled to the integrity of the acidification machinery.
Autophagic flux and lysosomal cargo handling
In simple terms: When autophagy is blocked, lysosomes may accumulate cargo and change how much enzyme they release.
Autophagic flux influences lysosomal content and function. PLK2 disrupts autophagic flux to promote SNCA/alpha-synuclein pathology, indicating that perturbations in autophagic flux can alter lysosomal handling of substrates and, indirectly, the availability of lysosomal enzymes for secretion. Deacetylation of ATG16L1 is required for LC3-associated lysosomal microautophagy, a process that further links autophagic machinery to lysosomal cargo dynamics. These findings support the view that negative regulation of lysosomal enzyme secretion is intertwined with autophagic and microautophagic pathways [5,6].
Endolysosomal sorting and signalling termination
In simple terms: Sorting proteins decide what stays in the lysosome and what leaves the cell.
The clathrin-associated AP-1 complex controls termination of STING signalling, a process that depends on endolysosomal trafficking. Because lysosomal enzyme secretion requires fusion of lysosomal compartments with the plasma membrane, factors that regulate endolysosomal sorting can indirectly restrain or permit enzyme release. This places GO:0090341 within the broader network of membrane trafficking and immune signalling regulation.
Transcriptional control of lysosome biogenesis
In simple terms: Cells can make more or fewer lysosomes, which changes how much enzyme is available to release.
TFEB is a master transcription factor for lysosome biogenesis and the autophagy-lysosome response. Trehalose causes low-grade lysosomal stress to activate TFEB and the autophagy-lysosome biogenesis response, showing that lysosomal stress can reprogramme lysosomal capacity. Because the amount of lysosomal enzyme available for secretion depends on lysosome biogenesis, TFEB-dependent transcriptional programmes are upstream determinants of GO:0090341.
Amino acid sensing and mTORC1 signalling
In simple terms: Cells sense nutrients and adjust lysosomal and autophagic activity accordingly.
The GATOR1 tumour suppressor complex has GAP activity for the Rag GTPases that signal amino acid sufficiency to mTORC1. mTORC1 is a central inhibitor of autophagy and a regulator of lysosomal biogenesis, so amino acid sensing through GATOR1-Rag-mTORC1 can indirectly influence lysosomal enzyme availability and secretion. This connects nutrient status to the negative regulation of lysosomal enzyme release.
Neuronal autophagy and degradation of negative regulators
In simple terms: In neurons, damage signals can remove the brakes on autophagy, changing lysosomal behaviour.
Mitochondrial damage triggers the concerted degradation of negative regulators of neuronal autophagy, a process that can alter autophagic flux and lysosomal function in neurons. Because neuronal lysosomes are critical for proteostasis, such changes can affect the secretion of lysosomal enzymes and contribute to neurodegeneration. This highlights the importance of GO:0090341 in post-mitotic cells.
Key Genes Involved in GO:0090341 negative regulation of secretion of lysosomal enzymes
The following genes and proteins have been experimentally linked to lysosomal homeostasis, autophagic flux, endolysosomal sorting or lysosomal enzyme secretion, and are therefore relevant to GO:0090341.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATP6V1A | Vacuolar ATPase subunit required for lysosomal acidification | Hypoxia-induced HIF-1alpha repression impairs lysosomal homeostasis and promotes EV secretion |
| HIF-1alpha | Hypoxia-inducible transcription factor | Mediates negative regulation of ATP6V1A under hypoxia |
| TFEB | Master transcription factor for lysosome biogenesis and autophagy | Activated by lysosomal stress to reprogramme lysosomal capacity |
| mTORC1 | Nutrient-sensitive kinase complex inhibiting autophagy | Regulated by GATOR1-Rag GTPase amino acid sensing |
| GATOR1 | GAP complex for Rag GTPases | Tumour suppressor complex controlling mTORC1 signalling |
| AP-1 | Clathrin-associated adaptor complex | Controls termination of STING signalling and endolysosomal sorting |
| ATG16L1 | Autophagy-related protein involved in LC3 lipidation | Deacetylation required for LC3-associated lysosomal microautophagy |
| PLK2 | Polo-like kinase 2 | Disrupts autophagic flux and promotes SNCA/alpha-synuclein pathology |
| SNCA | Alpha-synuclein | Accumulates when autophagic flux is disrupted |
| PCSK9 | Proprotein convertase subtilisin/kexin type 9 | Drives sterol-dependent metastatic organ choice in pancreatic cancer |
| STING | Stimulator of interferon genes | Signalling terminated by AP-1-dependent endolysosomal trafficking |
| LC3 | Autophagosome marker | Involved in LC3-associated lysosomal microautophagy |
| Rag GTPases | Amino acid sensing GTPases | Signal amino acid sufficiency to mTORC1 |
| Mitochondrial damage sensors | Sensors triggering degradation of autophagy negative regulators | Link mitochondrial stress to neuronal autophagy |
| Lysosomal hydrolases | Enzymes that degrade macromolecules | Their secretion is the outcome negatively regulated in GO:0090341 |
| EV cargo proteins | Proteins packaged into extracellular vesicles | EV secretion increases when lysosomal homeostasis is impaired |
How Is negative regulation of secretion of lysosomal enzymes Regulated?
GO:0090341 is regulated at multiple levels. Hypoxia can impair lysosomal homeostasis through HIF-1alpha-mediated negative regulation of ATP6V1A, thereby promoting EV secretion and altering lysosomal enzyme handling. Nutrient status is sensed by the GATOR1-Rag GTPase-mTORC1 axis, which controls autophagy and lysosomal biogenesis. Lysosomal stress activates TFEB to induce the autophagy-lysosome biogenesis response. Autophagic flux can be disrupted by PLK2, promoting SNCA pathology, while ATG16L1 deacetylation is required for LC3-associated lysosomal microautophagy. Endolysosomal sorting by AP-1 controls STING signalling termination, and mitochondrial damage triggers degradation of negative regulators of neuronal autophagy. Together, these pathways form a regulatory network that determines whether lysosomal enzymes are retained, degraded or secreted.
negative regulation of secretion of lysosomal enzymes and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ATP6V1A | Hypoxia-driven EV secretion in head and neck squamous cell carcinoma | HIF-1alpha knockdown or ATP6V1A overexpression in HNSCC cell lines |
| PCSK9 | Sterol-dependent metastatic organ choice in pancreatic cancer | PCSK9 knockout or point-mutation knock-in in pancreatic cancer models |
| PLK2 | SNCA/alpha-synuclein pathology and disrupted autophagic flux | PLK2 knockout or overexpression in neuronal cell models |
| ATG16L1 | LC3-associated lysosomal microautophagy | ATG16L1 deacetylation-mimetic knock-in in autophagy reporter cells |
| AP-1 | STING signalling termination and endolysosomal sorting | AP-1 subunit knockout in immune or epithelial cell lines |
Cancer progression and metastasis
Hypoxia promotes EV secretion by impairing lysosomal homeostasis in head and neck squamous cell carcinoma through HIF-1alpha-mediated negative regulation of ATP6V1A. This links GO:0090341 to tumour microenvironment remodelling and EV-mediated intercellular communication. In pancreatic cancer, PCSK9 drives sterol-dependent metastatic organ choice, illustrating how lipid and lysosomal pathways can influence metastasis. Dysregulated lysosomal enzyme secretion may therefore contribute to invasive and metastatic phenotypes [1,2].
Neurodegeneration and alpha-synuclein pathology
PLK2 disrupts autophagic flux to promote SNCA/alpha-synuclein pathology, indicating that impaired lysosomal and autophagic function contributes to neurodegeneration. Mitochondrial damage triggers the concerted degradation of negative regulators of neuronal autophagy, further linking lysosomal regulation to neuronal proteostasis. Because lysosomal enzyme secretion is part of lysosomal biology, its negative regulation is relevant to neurodegenerative disease mechanisms [5,8].
Immune signalling and STING trafficking
The clathrin-associated AP-1 complex controls termination of STING signalling, a process dependent on endolysosomal trafficking. Since lysosomal enzyme secretion requires endolysosomal membrane fusion events, regulators such as AP-1 may indirectly influence GO:0090341. This connects the term to innate immune signalling and inflammation.
Lysosomal storage and autophagic flux disorders
Trehalose causes low-grade lysosomal stress to activate TFEB and the autophagy-lysosome biogenesis response, showing that lysosomal stress can reprogramme lysosomal capacity. Deacetylation of ATG16L1 is required for LC3-associated lysosomal microautophagy, linking autophagic machinery to lysosomal cargo handling. These findings suggest that conditions affecting lysosomal biogenesis or autophagic flux can alter the negative regulation of lysosomal enzyme secretion [4,6].
From negative regulation of secretion of lysosomal enzymes-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ATP6V1A increase lysosomal enzyme secretion? | ATP6V1A knockout cell line with lysosomal enzyme secretion assay |
| Does HIF-1alpha repression of ATP6V1A mediate hypoxia-induced EV secretion? | HIF-1alpha knockout or point-mutation knock-in under hypoxia |
| Does PCSK9 modulate metastatic organ tropism? | PCSK9 knockout and overexpression in pancreatic cancer models |
| Does PLK2 disruption of autophagic flux alter SNCA pathology? | PLK2 knockout or overexpression in neuronal cells |
| Is ATG16L1 deacetylation required for lysosomal microautophagy? | ATG16L1 acetylation-site point-mutant knock-in |
| Does AP-1 control STING signalling termination? | AP-1 subunit knockout with STING trafficking assays |
How to Study the negative regulation of secretion of lysosomal enzymes Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lysosomal enzyme secretion assay | Extracellular activity of lysosomal hydrolases | Testing negative regulation of secretion |
| LC3 flux assay | Autophagic flux | Assessing PLK2 or ATG16L1 effects [5,6] |
| Lysosomal pH measurement | Lysosomal acidification | Evaluating ATP6V1A function |
| EV isolation and NTA | Extracellular vesicle number and size | Linking lysosomal homeostasis to EV secretion |
| TFEB nuclear translocation | Lysosomal stress response | Monitoring lysosome biogenesis activation |
| CRISPR knockout | Loss-of-function phenotype | Causal testing of candidate regulators [1,2,5] |
| Point-mutation knock-in | Specific residue function | Dissecting acetylation or catalytic sites |
| Proteomics | Protein composition of lysosomes or EVs | Identifying secreted lysosomal enzymes |
Lysosomal enzyme secretion assays
Measuring the release of lysosomal hydrolases into the extracellular medium is the most direct way to assess GO:0090341. Such assays can be combined with hypoxia or nutrient manipulation to test regulators such as HIF-1alpha and ATP6V1A. Controls should include lysosomal integrity markers to distinguish secretion from cell lysis.
Autophagic flux and lysosomal function assays
LC3 turnover, autophagic flux reporters and lysosomal pH measurements provide functional readouts of lysosomal state. PLK2 disruption of autophagic flux and ATG16L1-dependent LC3-associated lysosomal microautophagy are examples of processes that can be monitored with these assays [5,6]. TFEB nuclear translocation can be used as a readout of lysosomal stress.
Extracellular vesicle (EV) analysis
Because impaired lysosomal homeostasis can increase EV secretion, EV isolation and characterization (NTA, Western blot for EV markers, proteomics) are useful to study GO:0090341 in cancer models. EV cargo analysis can reveal whether lysosomal enzymes are among the secreted components.
Genetic perturbation and rescue
CRISPR knockout, point-mutation knock-in and overexpression are essential to establish causality. For example, ATP6V1A repression by HIF-1alpha can be tested by knockout and rescue, while PCSK9 variants can be modelled to study metastatic organ choice. PLK2 and ATG16L1 models can dissect autophagic and microautophagic contributions [5,6].
How CRISPR Can Be Used to Study GO:0090341 negative regulation of secretion of lysosomal enzymes
Knockout
CRISPR knockout of candidate genes such as ATP6V1A, HIF-1alpha, PLK2 or ATG16L1 allows loss-of-function testing of their role in negative regulation of lysosomal enzyme secretion [2,5,6]. Knockout models are particularly useful for establishing whether a gene is required for the secretion phenotype under hypoxia or nutrient stress.
Point Mutation
Point-mutation knock-in can be used to test specific residues, such as acetylation sites on ATG16L1 that are required for LC3-associated lysosomal microautophagy. Such models distinguish catalytic or regulatory site functions from complete loss of protein.
Knock-in
Knock-in of tagged or reporter alleles enables tracking of lysosomal proteins and their trafficking. For example, tagging ATP6V1A or TFEB can reveal localization changes under conditions that alter lysosomal enzyme secretion [2,4]. Knock-in models also allow physiological expression levels to be maintained.
Overexpression
Overexpression of regulators such as TFEB or PCSK9 can test sufficiency in driving or suppressing lysosomal enzyme secretion [1,4]. Overexpression models are useful when the endogenous protein is limiting, but results should be interpreted alongside knockout data [1,4].
How EDITGENE Supports negative regulation of secretion of lysosomal enzymes Research
Researchers studying negative regulation of secretion of lysosomal enzymes-related genes often need to determine whether a candidate gene is causally involved in lysosomal homeostasis, autophagic flux or EV secretion. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbation and functional validation of such candidates.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of secretion of lysosomal enzymes research.
Frequently Asked Questions About negative regulation of secretion of lysosomal enzymes
What is GO:0090341?
GO:0090341 is a Gene Ontology biological process term defined as any process that decreases the rate, frequency or extent of secretion of lysosomal enzymes, the controlled release of lysosomal enzymes by a cell.
What genes are involved in negative regulation of secretion of lysosomal enzymes?
Genes linked to lysosomal homeostasis and trafficking include ATP6V1A, HIF-1alpha, TFEB, mTORC1, AP-1, ATG16L1, PLK2 and SNCA [2,3,4,5,6,7].
How does hypoxia affect lysosomal enzyme secretion?
Hypoxia promotes EV secretion by impairing lysosomal homeostasis through HIF-1alpha-mediated negative regulation of ATP6V1A.
What is the role of TFEB in lysosomal enzyme secretion?
TFEB is activated by lysosomal stress and drives the autophagy-lysosome biogenesis response, influencing lysosomal capacity.
How is mTORC1 linked to lysosomal regulation?
The GATOR1 complex has GAP activity for Rag GTPases that signal amino acid sufficiency to mTORC1, which controls autophagy and lysosomal responses.
What diseases are associated with dysregulated lysosomal enzyme secretion?
Cancer progression, neurodegeneration and immune signalling disorders have been linked to lysosomal and autophagic dysfunction [1,2,3,5,8].
How can I study negative regulation of lysosomal enzyme secretion?
Use lysosomal enzyme secretion assays, autophagic flux assays, EV analysis and CRISPR genetic perturbation [2,5,6].
What CRISPR models are suitable for GO:0090341 research?
Knockout, point-mutation knock-in, tagged knock-in and overexpression models of genes such as ATP6V1A, ATG16L1 and PLK2 are suitable [2,5,6].
Does AP-1 regulate lysosomal enzyme secretion?
AP-1 controls termination of STING signalling and endolysosomal sorting, which can indirectly influence lysosomal cargo release.
What is the relationship between autophagy and lysosomal enzyme secretion?
Autophagic flux and LC3-associated lysosomal microautophagy influence lysosomal cargo handling and enzyme availability [5,6].
Conclusion
GO:0090341, negative regulation of secretion of lysosomal enzymes, is a biologically important process that integrates lysosomal acidification, autophagic flux, endolysosomal sorting and lysosome biogenesis. Key regulators include ATP6V1A, HIF-1alpha, TFEB, mTORC1, AP-1, ATG16L1, PLK2 and SNCA, with disease relevance in cancer, neurodegeneration and immune signalling [1-8]. Studying this term requires precise genetic models and functional assays. CRISPR knockout, point-mutation knock-in, tagged knock-in and overexpression cell models, combined with lysosomal enzyme secretion and EV assays, provide a robust framework for causal discovery [1,2,5,6].
References
- 1. Rademaker G et al.. 2025. PCSK9 drives sterol-dependent metastatic organ choice in pancreatic cancer.. Nature 643(8074):1381-1390 PMID: 40399683
- 2. Wang X et al.. 2023. Hypoxia promotes EV secretion by impairing lysosomal homeostasis in HNSCC through negative regulation of ATP6V1A by HIF-1α.. J Extracell Vesicles 12(2):e12310 PMID: 36748335
- 3. Liu Y et al.. 2022. Clathrin-associated AP-1 controls termination of STING signalling.. Nature 610(7933):761-767 PMID: 36261523
- 4. Jeong SJ et al.. 2021. Trehalose causes low-grade lysosomal stress to activate TFEB and the autophagy-lysosome biogenesis response.. Autophagy 17(11):3740-3752 PMID: 33706671
- 5. Zhang C et al.. 2025. PLK2 disrupts autophagic flux to promote SNCA/α-synuclein pathology.. Autophagy 21(8):1623-1643 PMID: 39773002
- 6. Wang Q et al.. 2025. Deacetylation of ATG16L1 is required for LC3-associated lysosomal microautophagy.. Autophagy 21(12):2948-2962 PMID: 40851277
- 7. Bar-Peled L et al.. 2013. A Tumor suppressor complex with GAP activity for the Rag GTPases that signal amino acid sufficiency to mTORC1.. Science 340(6136):1100-6 PMID: 23723238
- 8. Basak B et al.. 2025. Mitochondrial damage triggers the concerted degradation of negative regulators of neuronal autophagy.. Nat Commun 16(1):7367 PMID: 40783388
