GO:0140148 gel phase of basement membrane: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140148 (gel phase of basement membrane) is a cellular component defined as the gel formed of proteoglycans that fills the basement membrane extracellular matrix space.
• The basement membrane gel phase provides structural support and regulates cell behavior, including tumor cell dormancy and cytotoxic resistance.
• Basement membrane components, including proteoglycans and glycoproteins, are targets of autoantibodies in tubulointerstitial nephritis.
• The basement membrane gel phase influences cardiac electrical properties, highlighting its role beyond structural support.
• Pathogens such as Paracoccidioides brasiliensis and Trypanosoma brucei interact with basement membrane components, using them for differentiation or degradation.
• Studying GO:0140148 requires models that mimic the gel phase, such as basement membrane extracts for organotypic cultures and differentiation assays.
Description
The gel phase of basement membrane (GO:0140148) is a cellular component defined as the gel formed of proteoglycans that fills the basement membrane extracellular matrix (ECM) space. This gel phase is a critical part of the basement membrane, a specialized ECM structure that underlies epithelial and endothelial cells and surrounds muscle, fat, and Schwann cells. The gel phase provides a hydrated, viscoelastic environment that supports tissue architecture and modulates cellular processes. Researchers study this component to understand how the ECM influences cell behavior in development, homeostasis, and disease. The basement membrane gel phase is not merely a passive scaffold; it actively participates in signaling, barrier function, and mechanical support. Its composition and properties are implicated in a range of physiological and pathological contexts, from tumor dormancy to autoimmune nephritis. Understanding the gel phase of the basement membrane is therefore essential for ECM biology, cancer research, and regenerative medicine.
gel phase of basement membrane At A Glance
| GO ID | GO:0140148 |
|---|---|
| GO term | gel phase of basement membrane |
| Ontology | cellular_component |
| Synonym | None |
| Definition | Gel formed of proteoglycans filling the basement membrane ECM space. |
| Major function | Provides a hydrated, proteoglycan-rich matrix that fills the basement membrane ECM space, supporting structural integrity and modulating cell behavior. |
| Related components | Proteoglycans (e.g., perlecan, agrin), glycoproteins, and associated basement membrane proteins. |
| Associated processes | Tumor cell dormancy, cytotoxic resistance, cardiac electrical regulation, and pathogen differentiation. |
| Research relevance | Target for understanding ECM remodeling, autoimmune diseases, cancer, and infectious disease interactions. |
What Is GO:0140148?
According to the Gene Ontology, GO:0140148 (gel phase of basement membrane) is the gel formed of proteoglycans that fills the basement membrane ECM space. In other words, it is the hydrated, proteoglycan-rich material that occupies the interstitial space within the basement membrane, distinct from the insoluble network of collagen and laminin. This gel phase provides a medium for diffusion of nutrients and signaling molecules and contributes to the mechanical properties of the basement membrane.
Why Is gel phase of basement membrane Important in Cell Biology?
The gel phase of the basement membrane is important because it forms the functional microenvironment that regulates cell adhesion, migration, proliferation, and differentiation. Disruption of this gel phase is associated with tumor progression, where it can influence dormancy and resistance to cytotoxic therapies. In autoimmune diseases such as tubulointerstitial nephritis, components of the basement membrane gel phase are targeted by autoantibodies, leading to tissue damage. Additionally, the gel phase affects cardiac electrical properties, indicating its role in excitable tissues. Pathogens like Paracoccidioides brasiliensis and Trypanosoma brucei interact with basement membrane components, using them for invasion or differentiation. Thus, understanding GO:0140148 is crucial for developing therapeutic strategies in oncology, nephrology, cardiology, and infectious diseases.
• Regulates tumor cell dormancy and resistance to cytotoxic drugs.
• Serves as a target for autoantibodies in tubulointerstitial nephritis.
• Modulates cardiac electrical properties and tissue function.
• Provides a substrate for pathogen differentiation, as shown for Trypanosoma brucei.
• Is degraded by proteolytic enzymes from pathogens like Paracoccidioides brasiliensis.
• Supports organotypic arrangement of embryonic lung cells in culture.
• Contributes to the mechanical and barrier properties of basement membranes.
• Plays a role in tissue development and homeostasis.
• Represents a potential therapeutic target for ECM-related diseases.
• Requires specialized models to study its composition and function.
What Happens During gel phase of basement membrane?
Assembly of the gel phase
In simple terms: The gel phase forms when proteoglycans and other molecules assemble into a hydrated matrix within the basement membrane.
The gel phase of the basement membrane is assembled through the secretion and self-assembly of proteoglycans, such as perlecan and agrin, along with other basement membrane components. These molecules form a hydrated gel that fills the ECM space, providing a medium for diffusion and a scaffold for cell attachment. The assembly is influenced by interactions with collagen IV and laminin networks, which provide structural integrity.
Interaction with cells
In simple terms: Cells interact with the gel phase through receptors, which affects their behavior.
Cells bind to components of the gel phase via integrins and other receptors, leading to intracellular signaling that regulates proliferation, differentiation, and survival. For example, tumor cells in contact with the basement membrane gel phase can enter dormancy and become resistant to cytotoxic agents. This interaction is critical for tissue homeostasis and disease progression.
Remodeling and degradation
In simple terms: The gel phase can be broken down or remodeled by enzymes, which is important in both normal and disease processes.
Proteolytic enzymes, such as those secreted by pathogens or cancer cells, can degrade the gel phase. Paracoccidioides brasiliensis produces proteolytic activity that degrades basement membrane components. This remodeling can facilitate invasion, metastasis, or pathogen dissemination. In autoimmune diseases, immune complexes may also damage the gel phase.
Role in differentiation
In simple terms: The gel phase can provide signals that promote cell differentiation.
Basement membrane proteins, including those in the gel phase, serve as substrates that promote differentiation. For instance, Trypanosoma brucei differentiation is enhanced when cultured on basement membrane proteins. Similarly, embryonic lung cells organize into organotypic structures on basement membrane extracts, involving laminin. These examples highlight the gel phase as a bioactive substrate.
Key Genes Involved in GO:0140148 gel phase of basement membrane
The following genes and proteins are key components or interactors of the gel phase of the basement membrane, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSPG2 (Perlecan) | Major proteoglycan of basement membranes; forms gel phase | Studied for its role in ECM assembly and cell signaling. |
| AGRN (Agrin) | Proteoglycan involved in basement membrane organization | Implicated in neuromuscular junction and ECM structure. |
| COL4A1 | Collagen IV alpha chain; provides structural framework | Mutations cause basement membrane defects; interacts with gel phase. |
| LAMA1 | Laminin subunit; cell adhesion and matrix assembly | Involved in organotypic arrangement of lung cells. |
| LAMB1 | Laminin subunit; basement membrane component | Studied in development and disease. |
| LAMC1 | Laminin subunit; basement membrane component | Essential for basement membrane integrity. |
| NID1 (Nidogen-1) | Links collagen IV and laminin networks | Important for basement membrane assembly. |
| NID2 (Nidogen-2) | Basement membrane glycoprotein | Contributes to ECM stability. |
| FN1 (Fibronectin) | ECM glycoprotein; interacts with gel phase | Involved in cell adhesion and migration. |
| DAG1 (Dystroglycan) | Receptor for laminin and agrin | Mediates cell-matrix interactions. |
| ITGB1 (Integrin beta-1) | Cell surface receptor for ECM | Signals from gel phase components. |
| MMP2 | Matrix metalloproteinase; degrades ECM | Remodels basement membrane gel phase. |
| MMP9 | Matrix metalloproteinase; degrades ECM | Involved in ECM turnover. |
| TGFB1 | Cytokine regulating ECM production | Modulates basement membrane synthesis. |
| FGF2 | Growth factor binding to proteoglycans | Signals via gel phase components. |
| VEGFA | Angiogenic factor; interacts with ECM | Regulated by basement membrane. |
| PLAU (uPA) | Plasminogen activator; ECM remodeling | Activates proteolysis of gel phase. |
| PLAT (tPA) | Plasminogen activator; ECM remodeling | Involved in matrix degradation. |
How Is gel phase of basement membrane Regulated?
The gel phase of the basement membrane is regulated at multiple levels. Its synthesis and assembly are controlled by growth factors such as TGFB1 and FGF2, which modulate the expression of proteoglycans and other ECM components. Proteolytic enzymes, including matrix metalloproteinases (MMPs) and plasminogen activators, regulate its degradation and remodeling. Additionally, interactions with cell surface receptors like integrins and dystroglycan can influence the organization and turnover of the gel phase. In disease states, autoimmune antibodies can target specific components, leading to disruption.
gel phase of basement membrane and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSPG2 | Cancer dormancy and cytotoxic resistance | Knockout of HSPG2 in tumor cell lines to study dormancy |
| COL4A1 | Autoimmune nephritis | Point mutations in COL4A1 to mimic antigenic epitopes |
| DAG1 | Cardiac electrical dysfunction | Overexpression of DAG1 in cardiomyocytes to assess electrical properties |
| MMP2 | Pathogen-mediated ECM degradation | Knockout of MMP2 in host cells to test pathogen invasion |
| LAMA1 | Developmental lung defects | Knock-in of tagged LAMA1 to track basement membrane assembly |
Cancer and tumor dormancy
The basement membrane gel phase plays a critical role in tumor cell dormancy and resistance to cytotoxic therapies. Tumor cells in contact with the gel phase can enter a dormant state and become less sensitive to chemotherapy, contributing to disease recurrence. Understanding these interactions may lead to new strategies for targeting dormant tumor cells.
Autoimmune tubulointerstitial nephritis
In tubulointerstitial nephritis, autoantibodies target components of the tubular basement membrane, including a 58-kDa antigen. This autoimmune response leads to inflammation and kidney damage. The gel phase components are likely involved in the antigenic targets, highlighting the importance of basement membrane integrity in renal health.
Cardiac electrical regulation
The basement membrane gel phase influences cardiac electrical properties. Studies show that basement membrane components can modulate the electrical behavior of cardiac cells, affecting conduction and arrhythmogenesis. This suggests that ECM remodeling in the heart may contribute to electrical dysfunction.
Infectious diseases
Pathogens such as Paracoccidioides brasiliensis and Trypanosoma brucei interact with the basement membrane gel phase. Paracoccidioides brasiliensis secretes proteolytic enzymes that degrade basement membrane components, while Trypanosoma brucei uses basement membrane proteins as a substrate for differentiation. These interactions are important for pathogen invasion and survival.
From gel phase of basement membrane-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate gel phase assembly? | Knockout of gene X in epithelial cells followed by ECM analysis |
| Does a specific mutation in a basement membrane gene alter gel phase properties? | Point mutation knock-in in cell lines |
| Can a tagged protein be used to visualize gel phase dynamics? | Knock-in of fluorescent tag (e.g., GFP) into a proteoglycan gene |
| Does overexpression of a proteoglycan enhance gel phase formation? | Overexpression of HSPG2 or AGRN in cultured cells |
| What is the role of a candidate gene in tumor dormancy? | Knockout or overexpression in tumor cells followed by dormancy assays |
| How does a pathogen interact with the gel phase? | In vitro degradation assays using basement membrane extracts |
How to Study the gel phase of basement membrane Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Mass spectrometry | Protein composition of gel phase | Identifying proteoglycans in basement membrane extracts |
| Immunofluorescence | Localization of gel phase components | Visualizing basement membrane in tissues |
| Electron microscopy | Ultrastructure of gel phase | Examining ECM architecture |
| Cell adhesion assay | Cell binding to gel phase | Testing integrin-mediated adhesion |
| Differentiation assay | Pathogen or cell differentiation on gel phase | Studying Trypanosoma brucei differentiation |
| Degradation assay | Proteolytic activity against gel phase | Screening for ECM-degrading enzymes |
| Organotypic culture | Tissue-like organization on gel phase | Lung cell arrangement on basement membrane extract |
| Autoantibody detection | Immune response to gel phase components | Diagnosing tubulointerstitial nephritis |
Proteomics and mass spectrometry
Proteomic approaches can identify and quantify the protein components of the gel phase. Mass spectrometry-based methods allow characterization of proteoglycans and associated proteins in basement membrane extracts.
Imaging and microscopy
Immunofluorescence and electron microscopy can visualize the gel phase and its components in tissues and cultured cells. These methods help assess the distribution and integrity of the gel phase.
Functional assays
Cell adhesion, migration, and differentiation assays on basement membrane extracts can test the functional role of the gel phase. For example, organotypic cultures of lung cells on basement membrane extract reveal the importance of laminin.
Degradation assays
Proteolytic degradation of the gel phase can be measured using agarose overlays containing fluorescent substrates, as shown for Paracoccidioides brasiliensis. Such assays help identify enzymes that remodel the gel phase.
How CRISPR Can Be Used to Study GO:0140148 gel phase of basement membrane
Knockout
CRISPR knockout of genes encoding gel phase components (e.g., HSPG2, AGRN) can reveal their roles in basement membrane assembly and function. Knockout cell lines can be used to study tumor dormancy or ECM remodeling.
Point Mutation
Introducing point mutations into basement membrane genes can model human diseases or test specific amino acid functions. For example, mutations in COL4A1 associated with nephritis can be recapitulated to study autoantibody binding.
Knock-in
Knock-in of tags (e.g., GFP) into endogenous loci allows real-time visualization of gel phase components. This approach can track the dynamics of proteoglycans in living cells.
Overexpression
Overexpression of gel phase components can enhance matrix deposition and study gain-of-function effects. For instance, overexpressing HSPG2 may increase gel phase formation and alter cell behavior.
How EDITGENE Supports gel phase of basement membrane Research
Researchers studying gel phase of basement membrane-related genes often need to determine whether a candidate gene is causally involved in basement membrane assembly, remodeling, or disease. EDITGENE provides a comprehensive suite of CRISPR services to enable such investigations, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for gel phase of basement membrane research.
Frequently Asked Questions About gel phase of basement membrane
What is the gel phase of basement membrane?
The gel phase of basement membrane (GO:0140148) is the gel formed of proteoglycans that fills the basement membrane ECM space, providing a hydrated matrix that supports cell function.
What genes are involved in the gel phase of basement membrane?
Key genes include HSPG2 (perlecan), AGRN (agrin), COL4A1, laminin subunits (LAMA1, LAMB1, LAMC1), and nidogens (NID1, NID2), among others.
How is the gel phase of basement membrane studied?
It is studied using proteomics, imaging, functional assays, and CRISPR models to understand its composition and roles in health and disease.
What diseases are associated with the gel phase of basement membrane?
It is implicated in cancer dormancy, autoimmune tubulointerstitial nephritis, cardiac electrical dysfunction, and infectious diseases.
What is the role of proteoglycans in the gel phase?
Proteoglycans such as perlecan and agrin form the hydrated gel that fills the basement membrane space, providing structural and signaling functions.
How does the gel phase affect tumor cells?
The gel phase can induce tumor cell dormancy and confer resistance to cytotoxic therapies.
Can CRISPR be used to study the gel phase of basement membrane?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to dissect gene functions in the gel phase.
What is the difference between the gel phase and the basement membrane?
The basement membrane is the entire ECM structure, while the gel phase specifically refers to the proteoglycan-rich gel filling its interstitial space.
Which pathogens interact with the gel phase of basement membrane?
Paracoccidioides brasiliensis degrades it with proteolytic enzymes, and Trypanosoma brucei uses it as a substrate for differentiation.
How can I model the gel phase of basement membrane in vitro?
Basement membrane extracts, such as Matrigel, are commonly used to mimic the gel phase for cell culture and differentiation assays.
Conclusion
The gel phase of basement membrane (GO:0140148) is a vital component of the extracellular matrix that influences cell behavior in development, homeostasis, and disease. Its proteoglycan-rich gel provides structural support and modulates signaling, with roles in tumor dormancy, autoimmunity, cardiac function, and pathogen interactions. Understanding its biology requires interdisciplinary approaches, including CRISPR-based models and biochemical assays. EDITGENE offers comprehensive services to facilitate research on this important ECM component.
References
- 1. Pogány G et al.. 2001. Role of the basement membrane in tumor cell dormancy and cytotoxic resistance.. Oncology 60(3):274-81 PMID: 11340380
- 2. Butkowski RJ et al.. 1990. Characterization of a tubular basement membrane component reactive with autoantibodies associated with tubulointerstitial nephritis.. J Biol Chem 265(34):21091-8 PMID: 2250013
- 3. Yang H et al.. 2014. Role of the basement membrane in regulation of cardiac electrical properties.. Ann Biomed Eng 42(6):1148-57 PMID: 24577875
- 5. Clayman MD et al.. 1986. Isolation of the target antigen of human anti-tubular basement membrane antibody-associated interstitial nephritis.. J Clin Invest 77(4):1143-7 PMID: 3514674
- 6. Puccia R et al.. 1999. Detection of the basement membrane-degrading proteolytic activity of Paracoccidioides brasiliensis after SDS-PAGE using agarose overlays containing Abz-MKALTLQ-EDDnp.. Braz J Med Biol Res 32(5):645-9 PMID: 10412577
- 7. Schuger L et al.. 1990. Organotypic arrangement of mouse embryonic lung cells on a basement membrane extract: involvement of laminin.. Development 110(4):1091-9 PMID: 2100256
- 8. Rojas F et al.. 2021. Basement membrane proteins as a substrate for efficient Trypanosoma brucei differentiation in vitro.. PLoS Negl Trop Dis 15(4):e0009284 PMID: 33909626
