GO:0060243 negative regulation of cell growth involved in contact inhibition: Cellular Process, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060243 describes the biological process in which increased cell density triggers negative regulation of cell growth, a phenomenon known as contact inhibition [2,5].
• Contact inhibition is essential for normal tissue architecture and its loss is a hallmark of cancer, including gliomas and breast carcinomas [3,5].
• Key molecular players include cell adhesion molecules like E-cadherin, signaling mediators such as Hes1, p38 MAPK, PKCδ, and CCN3, and transcriptional regulators like YAP [2,3,5,6,7,8].
• Disruption of contact inhibition pathways leads to uncontrolled proliferation and tumorigenesis, making these genes attractive therapeutic targets [3,5,8].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable precise dissection of genes involved in contact inhibition [2,5,8].
• Studying GO:0060243 requires a combination of cell density assays, molecular imaging, and omics technologies to uncover regulatory mechanisms [6,7].
Description
Contact inhibition is a fundamental homeostatic mechanism that prevents normal cells from overproliferating when they become crowded. The Gene Ontology term GO:0060243, negative regulation of cell growth involved in contact inhibition, captures the biological process by which increased cell density leads to a slowdown or arrest of cell growth [2,5]. This process is critical for maintaining tissue architecture and preventing tumor formation, and its dysregulation is a common feature of many cancers [3,5]. Understanding the molecular players and regulatory circuits of contact inhibition is therefore of broad interest to cell biologists and cancer researchers. Key studies have identified roles for cell adhesion molecules, signaling kinases, and transcription factors in mediating this response [2,5,6,7,8]. For example, dominant-negative E-cadherin reverses contact inhibition in breast carcinoma cells, highlighting the importance of adhesion in this process. Similarly, Hes1 is required for contact inhibition in 3T3-L1 preadipocytes, linking Notch signaling to density-dependent growth control. These findings underscore the complexity and clinical relevance of GO:0060243. This article provides a comprehensive overview of the definition, mechanisms, key genes, disease associations, and research methodologies for studying negative regulation of cell growth involved in contact inhibition.
negative regulation of cell growth involved in contact inhibition At A Glance
| GO ID | GO:0060243 |
|---|---|
| GO term | negative regulation of cell growth involved in contact inhibition |
| Ontology | biological_process |
| Synonym | None |
| Major function | Negative regulation of cell growth in response to increased cell density |
| Related processes | Cell adhesion, signal transduction, cell cycle arrest |
| Key regulators | E-cadherin, Hes1, p38 MAPK, PKCδ, CCN3, YAP |
| Disease relevance | Cancer (glioma, breast carcinoma, lung adenocarcinoma) |
What Is GO:0060243?
GO:0060243 is defined as the negative regulation of cell growth in response to increased cell density. In other words, as cells become more crowded, they receive signals to stop growing, a phenomenon known as contact inhibition. This process is distinct from other forms of growth arrest and is specifically triggered by cell-cell contacts. It involves the integration of adhesion signals, cytoskeletal changes, and intracellular signaling cascades that ultimately inhibit proliferation [2,5,6,7,8].
Why Is negative regulation of cell growth involved in contact inhibition Important in Cell Biology?
Contact inhibition is a cornerstone of tissue homeostasis and a critical barrier against tumorigenesis. Loss of contact inhibition allows cells to proliferate beyond normal limits, contributing to cancer development and progression [3,5,8]. Studying GO:0060243 helps researchers understand how normal cells sense density and how this process is subverted in diseases. Moreover, genes involved in this process, such as E-cadherin and YAP, are frequently altered in human cancers, making them potential therapeutic targets [5,8]. Thus, elucidating the mechanisms of contact inhibition has direct implications for cancer biology and regenerative medicine.
• Maintains tissue architecture by preventing overgrowth [2,5].
• Its loss is a hallmark of cancer, including gliomas and carcinomas [3,5].
• Involved in development and organ size control.
• Provides insights into cell-cell communication and adhesion.
• Key genes are potential biomarkers and drug targets [3,8].
• Helps understand wound healing and regeneration.
• Relevant to aging and degenerative diseases.
• Enables study of mechanotransduction and density sensing.
• Informs tissue engineering and regenerative medicine strategies.
• Offers a model for studying tumor suppressor pathways [3,5].
What Happens During negative regulation of cell growth involved in contact inhibition?
Cell Density Sensing and Adhesion
In simple terms: Cells sense when they are crowded through touch and adhesion molecules.
As cells proliferate and become densely packed, cell-cell contacts increase. Adhesion molecules such as E-cadherin mediate physical connections between neighboring cells, initiating signals that lead to growth inhibition. Dominant-negative E-cadherin disrupts this adhesion and reverses contact inhibition in breast carcinoma cells, demonstrating the essential role of E-cadherin in density sensing.
Intracellular Signaling Cascades
In simple terms: Adhesion triggers a chain of signals inside the cell that stop growth.
Upon cell-cell contact, various signaling pathways are activated. For instance, p38 MAPK activity is attenuated upon contact inhibition in fibroblasts, suggesting its involvement in the process. Protein kinase Cδ (PKCδ) is also implicated in contact-dependent inhibition of growth in human and murine fibroblasts. These kinases modulate downstream targets to halt proliferation.
Transcriptional and Post-Transcriptional Regulation
In simple terms: The cell changes which genes are turned on or off to stop dividing.
Contact inhibition involves changes in gene expression. Hes1, a Notch target, is required for contact inhibition of cell proliferation in 3T3-L1 preadipocytes. Additionally, CCN3 (NOV) inhibits glioma cell growth and tumorigenic potential, acting as a negative regulator. These factors orchestrate a transcriptional program that enforces growth arrest.
Cytoskeletal Rearrangements and YAP/TAZ
In simple terms: The cell's skeleton changes and mechanical signals are relayed to the nucleus.
Cell density alters cytoskeletal tension and the activity of mechanosensitive transcriptional co-activators like YAP. YAP mediates positive regulation of lung adenocarcinoma H1299 cell growth, and its inhibition is associated with contact inhibition. The Hippo pathway, which controls YAP, is a key mediator of density-dependent growth control.
Integration with Cell Cycle Machinery
In simple terms: The signals ultimately hit the cell cycle engine to stop division.
The aforementioned pathways converge on cell cycle regulators such as cyclins and CDKs, leading to cell cycle arrest. Although specific mechanisms are not fully detailed in the cited papers, the overall outcome is a halt in proliferation [2,5,6,7,8].
Key Genes Involved in GO:0060243 negative regulation of cell growth involved in contact inhibition
The following genes and proteins have been experimentally linked to negative regulation of cell growth involved in contact inhibition.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDH1 (E-cadherin) | Cell-cell adhesion; mediates contact inhibition | Dominant-negative E-cadherin reverses contact inhibition in breast carcinoma cells |
| HES1 | Transcription factor; Notch target | Required for contact inhibition in 3T3-L1 preadipocytes |
| CCN3 (NOV) | Secreted matricellular protein | Inhibits glioma cell growth and tumorigenic potential |
| MAPK14 (p38 MAPK) | Stress-activated kinase | Activity attenuated upon contact inhibition in fibroblasts |
| PRKCD (PKCδ) | Serine/threonine kinase | Involved in contact-dependent inhibition of growth in fibroblasts |
| YAP1 | Transcriptional co-activator | Mediates positive regulation of H1299 cell growth; inhibited by contact inhibition |
| SPRED1/2 | Sprouty-related inhibitors of Ras/MAPK | Inhibition of Spred/Sprouty expression in contact dermatitis model |
| SPRY1/2 | Sprouty proteins | Inhibition of Spred/Sprouty expression in contact dermatitis model |
| CDKN1A (p21) | Cyclin-dependent kinase inhibitor | Potential downstream effector of contact inhibition (inferred from general knowledge, not cited) |
| CDKN1B (p27) | Cyclin-dependent kinase inhibitor | Potential downstream effector (inferred) |
| TP53 | Tumor suppressor | Often mutated in cancers with lost contact inhibition (inferred) |
| CTNNB1 (β-catenin) | Adherens junction component; signaling | Links adhesion to growth control (inferred) |
| NF2 (Merlin) | Cytoskeletal linker; Hippo pathway | Involved in contact inhibition (inferred) |
| LATS1/2 | Hippo pathway kinases | Phosphorylate YAP to inhibit growth (inferred) |
| TEAD1-4 | Transcription factors | Partners of YAP (inferred) |
| RASSF1A | Ras association domain family | Tumor suppressor linked to contact inhibition (inferred) |
| DLC1 | Rho GTPase-activating protein | Deleted in liver cancer; involved in contact inhibition (inferred) |
How Is negative regulation of cell growth involved in contact inhibition Regulated?
The process of contact inhibition is regulated by multiple mechanisms. Cell adhesion molecules like E-cadherin initiate signals upon cell-cell contact. Intracellular kinases such as p38 MAPK and PKCδ modulate the response [6,7]. Transcriptional regulators like Hes1 and CCN3 enforce growth arrest [2,3]. The Hippo pathway and its effector YAP are critical for integrating mechanical cues from cell density. Additionally, Sprouty/Spred proteins may modulate Ras/MAPK signaling in the context of contact dermatitis. These layers of regulation ensure that growth is tightly controlled in response to density.
negative regulation of cell growth involved in contact inhibition and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CCN3 (NOV) | Glioma | U87 glioma cell line xenograft |
| CDH1 (E-cadherin) | Breast carcinoma | MCF-7 or MDA-MB-231 cells with dominant-negative E-cadherin |
| YAP1 | Lung adenocarcinoma | H1299 cell line with YAP knockout or overexpression |
| HES1 | Obesity and metabolic disorders | 3T3-L1 preadipocytes for contact inhibition studies |
| SPRED1/2 | Contact dermatitis | Mouse model of contact dermatitis |
Cancer: Loss of Contact Inhibition
Loss of contact inhibition is a hallmark of cancer. In gliomas, CCN3 (NOV) inhibits cell growth and tumorigenic potential, and its downregulation may contribute to tumor progression. In breast carcinoma, dominant-negative E-cadherin reverses contact inhibition, promoting uncontrolled growth. In lung adenocarcinoma, YAP mediates positive regulation of cell growth, and its overactivity bypasses contact inhibition. These examples highlight how disruption of GO:0060243 contributes to tumorigenesis.
Contact Dermatitis and Skin Inflammation
In a contact dermatitis-like model, inhibition of Spred/Sprouty expression was observed, suggesting that these regulators of Ras/MAPK signaling may be involved in skin inflammation and potentially in contact inhibition-like processes in the skin. This links GO:0060243 to inflammatory skin conditions.
Metabolic and Fibrotic Disorders
Contact inhibition mechanisms in fibroblasts involve p38 MAPK and PKCδ [6,7]. Dysregulation of these pathways may contribute to fibrotic diseases characterized by excessive fibroblast proliferation, such as pulmonary fibrosis or scleroderma. However, direct evidence is not provided in the cited papers.
From negative regulation of cell growth involved in contact inhibition-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X mediate contact inhibition? | CRISPR knockout in cell lines (e.g., HEK293, fibroblasts) followed by density assays |
| Does a specific mutation in gene X affect contact inhibition? | Point mutation knock-in using CRISPR in cell lines |
| Does overexpression of gene X enhance contact inhibition? | CRISPR-mediated overexpression or lentiviral transduction |
| Does tagging gene X affect its localization during contact inhibition? | Knock-in of fluorescent tag (e.g., GFP) using CRISPR |
| What is the transcriptional response to contact inhibition? | RNA-seq of cells at low vs. high density |
| What proteins interact with gene X during contact inhibition? | Proteomics (AP-MS) or BioID with tagged knock-in |
How to Study the negative regulation of cell growth involved in contact inhibition Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cell density assay | Proliferation rate at different densities | Assess contact inhibition in wild-type vs. mutant cells |
| Immunofluorescence | Localization of proteins (e.g., E-cadherin, YAP) | Visualize junction formation and YAP nuclear exclusion |
| RNA-seq | Global gene expression changes | Identify transcriptional programs of contact inhibition |
| Phosphoproteomics | Kinase activity and signaling networks | Map p38 MAPK and PKCδ substrates |
| CRISPR knockout screen | Genes required for contact inhibition | Discover novel regulators |
| Live-cell imaging | Real-time dynamics of growth arrest | Track cell cycle exit upon crowding |
| Co-immunoprecipitation | Protein-protein interactions | Identify complexes involving E-cadherin or YAP |
| Proximity ligation assay | In situ protein interactions | Detect interactions at cell junctions |
Cell Density Assays
Classic contact inhibition assays involve seeding cells at different densities and measuring proliferation over time. For example, 3T3-L1 preadipocytes are used to study contact inhibition, where Hes1 is required. Fibroblasts are also common models [6,7]. These assays can be combined with live-cell imaging to track growth arrest.
Molecular Imaging and Adhesion Studies
Immunofluorescence and live-cell imaging can visualize cell-cell junctions and cytoskeletal changes. E-cadherin localization and function can be assessed using dominant-negative constructs or CRISPR knockouts. YAP localization (nuclear vs. cytoplasmic) is a readout of Hippo pathway activity.
Omics Approaches
RNA-seq and proteomics can identify global changes in gene expression and protein abundance during contact inhibition. For instance, transcriptomic profiling of cells at low vs. high density can reveal novel regulators. Phosphoproteomics can uncover signaling events mediated by p38 MAPK or PKCδ [6,7].
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes essential for contact inhibition. Cells are transduced with a sgRNA library, grown to high density, and sgRNAs that allow continued proliferation are selected. This approach can uncover novel regulators of GO:0060243.
How CRISPR Can Be Used to Study GO:0060243 negative regulation of cell growth involved in contact inhibition
Knockout
CRISPR knockout of candidate genes (e.g., CDH1, HES1, YAP1) can be used to test their requirement for contact inhibition. For example, knocking out HES1 in 3T3-L1 preadipocytes would be expected to impair contact inhibition. Similarly, YAP1 knockout in H1299 cells may enhance contact inhibition.
Point Mutation
Introducing specific point mutations (e.g., in CDH1 to mimic dominant-negative E-cadherin) can dissect the role of adhesion in contact inhibition. CRISPR prime editing or homology-directed repair can create such mutations in endogenous loci.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into genes like YAP1 allows real-time tracking of protein localization during contact inhibition. Knock-in of reporter cassettes (e.g., luciferase) can enable high-throughput screening.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can be used to study gain-of-function effects. For instance, overexpressing CCN3 (NOV) in glioma cells inhibits growth and tumorigenicity. Overexpression of Spred/Sprouty proteins may modulate contact inhibition in skin models.
How EDITGENE Supports negative regulation of cell growth involved in contact inhibition Research
Researchers studying negative regulation of cell growth involved in contact inhibition-related genes often need to determine whether a candidate gene is causally involved in the process or is merely a bystander. EDITGENE provides a comprehensive suite of CRISPR services to enable precise genetic manipulation and functional interrogation of these genes in relevant cell models.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of cell growth involved in contact inhibition research.
Frequently Asked Questions About negative regulation of cell growth involved in contact inhibition
What is GO:0060243?
GO:0060243 is the Gene Ontology term for negative regulation of cell growth involved in contact inhibition, a biological process where increased cell density leads to growth arrest [2,5].
What genes are involved in contact inhibition?
Key genes include CDH1 (E-cadherin), HES1, CCN3 (NOV), MAPK14 (p38 MAPK), PRKCD (PKCδ), and YAP1 [2,3,5,6,7,8].
How is contact inhibition studied?
Common methods include cell density assays, immunofluorescence, RNA-seq, and CRISPR screens [2,5,6,7,8].
Why is contact inhibition important in cancer?
Loss of contact inhibition allows uncontrolled cell proliferation, a hallmark of cancer [3,5,8].
What is the role of E-cadherin in contact inhibition?
E-cadherin mediates cell-cell adhesion and is essential for contact inhibition; dominant-negative E-cadherin reverses it.
How does YAP regulate contact inhibition?
YAP is a transcriptional co-activator that promotes growth; its inhibition is associated with contact inhibition.
Can CRISPR be used to study contact inhibition?
Yes, CRISPR knockout, knock-in, and overexpression models enable precise dissection of genes involved in contact inhibition [2,5,8].
What diseases are linked to defective contact inhibition?
Cancer (glioma, breast carcinoma, lung adenocarcinoma) and possibly contact dermatitis [1,3,5,8].
What is the role of Hes1 in contact inhibition?
Hes1 is required for contact inhibition of cell proliferation in 3T3-L1 preadipocytes.
How does p38 MAPK contribute to contact inhibition?
p38 MAPK activity is attenuated upon contact inhibition in fibroblasts, suggesting its involvement.
Conclusion
GO:0060243, negative regulation of cell growth involved in contact inhibition, is a fundamental biological process that safeguards tissue homeostasis. Its dysregulation is intimately linked to cancer and other proliferative disorders. Through the concerted action of adhesion molecules, signaling kinases, and transcriptional regulators, cells sense density and halt growth. Continued research using advanced CRISPR models and omics technologies will further unravel the complexities of this process and may yield new therapeutic strategies.
References
- 1. Sakai H et al.. 2022. Inhibition of Spred/Sprouty Expression in the Skin of a Contact Dermatitis-Like Model.. Biol Pharm Bull 45(8):1208-1212 PMID: 35908904
- 2. Noda N et al.. 2011. Hes1 is required for contact inhibition of cell proliferation in 3T3-L1 preadipocytes.. Genes Cells 16(6):704-13 PMID: 21481105
- 3. Gupta N et al.. 2001. Inhibition of glioma cell growth and tumorigenic potential by CCN3 (NOV).. Mol Pathol 54(5):293-9 PMID: 11577170
- 5. Vizirianakis IS et al.. 2002. Dominant-negative E-cadherin alters adhesion and reverses contact inhibition of growth in breast carcinoma cells.. Int J Oncol 21(1):135-44 PMID: 12063560
- 6. Slisz M et al.. 2008. Attenuation of p38 MAPK activity upon contact inhibition in fibroblasts.. Mol Cell Biochem 308(1-2):65-73 PMID: 17906919
- 7. Heit I et al.. 2001. Involvement of protein kinase Cdelta in contact-dependent inhibition of growth in human and murine fibroblasts.. Oncogene 20(37):5143-54 PMID: 11526503
- 8. Xu L et al.. 2019. YAP mediates the positive regulation of hnRNPK on the lung adenocarcinoma H1299 cell growth.. Acta Biochim Biophys Sin (Shanghai) 51(7):677-687 PMID: 31187136
