GO:2001114 positive regulation of cellular response to hepatocyte growth factor stimulus: Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2001114 describes any process that activates or increases the frequency, rate or extent of the cellular response to hepatocyte growth factor (HGF) stimulation.
• HGF is a pleiotropic cytokine that signals primarily through the MET receptor tyrosine kinase, but the positive regulation of this response can involve multiple modulators.
• This GO term is critical for understanding tissue regeneration, wound healing, and cancer progression, where HGF signaling is often dysregulated.
• In liver myofibroblasts, HGF can promote growth inhibition and apoptosis, leading to resolution from liver cirrhosis, highlighting the context-dependent nature of this process.
• Research into GO:2001114 employs CRISPR knockout, knock-in, and overexpression models to dissect the molecular players that enhance HGF responsiveness.
• Targeting positive regulators of HGF signaling may offer therapeutic strategies for fibrosis, cirrhosis, and HGF-dependent cancers.
Description
The Gene Ontology (GO) term GO:2001114, positive regulation of cellular response to hepatocyte growth factor stimulus, is a biological process that encompasses any mechanism that amplifies the cellular response to hepatocyte growth factor (HGF). HGF is a multifunctional cytokine that binds to the MET receptor tyrosine kinase, triggering a cascade of intracellular signals that control cell proliferation, survival, motility, and morphogenesis. The positive regulation of this response is essential for fine-tuning tissue repair and regeneration, but its dysregulation contributes to fibrosis and cancer. Understanding the molecular players that enhance HGF signaling is therefore of significant biomedical interest. This article provides a comprehensive overview of GO:2001114, integrating the official GO definition with insights from peer-reviewed literature, and outlines how CRISPR-based models can be used to study its components.
positive regulation of cellular response to hepatocyte growth factor stimulus At A Glance
| GO ID | GO:2001114 |
|---|---|
| GO term | positive regulation of cellular response to hepatocyte growth factor stimulus |
| Ontology | biological_process |
| Synonym | positive regulation of cellular response to HGF stimulus |
| Definition | Any process that activates or increases the frequency, rate or extent of cellular response to hepatocyte growth factor stimulus. |
| Major function | Amplification of HGF-induced intracellular signaling, affecting cell proliferation, survival, motility, and morphogenesis. |
| Related receptor | MET (hepatocyte growth factor receptor) |
| Related ligand | HGF (hepatocyte growth factor) |
| Disease relevance | Liver cirrhosis, fibrosis, cancer progression, tissue regeneration |
What Is GO:2001114?
According to the Gene Ontology, GO:2001114 is defined as any process that activates or increases the frequency, rate or extent of cellular response to hepatocyte growth factor stimulus. In simpler terms, it refers to the set of molecular events that make a cell more sensitive or responsive to HGF, thereby boosting the downstream signaling and biological outcomes triggered by this growth factor. This term is a child of positive regulation of cellular response to growth factor stimulus and is specific to HGF, distinguishing it from general growth factor signaling modulators.
Why Is positive regulation of cellular response to hepatocyte growth factor stimulus Important in Cell Biology?
GO:2001114 is important because HGF signaling is a central regulator of tissue homeostasis and repair, and its positive regulation determines the magnitude and duration of cellular responses that can either promote regeneration or drive disease. In the liver, HGF acts as a potent anti-fibrotic and anti-cirrhotic factor by inhibiting myofibroblast growth and inducing apoptosis, and positive regulators of this response could enhance these protective effects. Conversely, in cancer, enhanced HGF signaling can promote tumor growth, invasion, and metastasis, making positive regulators potential therapeutic targets. Thus, understanding the mechanisms that positively regulate HGF response is crucial for developing interventions in regenerative medicine and oncology.
• HGF signaling is essential for liver regeneration and protection against cirrhosis.
• Positive regulation of HGF response can enhance tissue repair after injury.
• Dysregulated HGF signaling is implicated in various cancers, including liver, lung, and gastric cancers.
• Modulators of HGF response are potential drug targets for fibrosis and cancer.
• GO:2001114 helps annotate genes that amplify HGF signaling in functional genomics studies.
• CRISPR screens can identify novel positive regulators of HGF response.
• Understanding this process aids in designing cell-based therapies for regenerative medicine.
• It provides a framework for studying context-dependent effects of HGF in different cell types.
What Happens During positive regulation of cellular response to hepatocyte growth factor stimulus?
HGF Binding and MET Activation
In simple terms: HGF binds to its receptor MET, causing MET to activate and send signals inside the cell.
The cellular response to HGF begins with the binding of HGF to the MET receptor tyrosine kinase on the cell surface. This binding induces MET dimerization and autophosphorylation, creating docking sites for adaptor proteins that propagate downstream signals. Positive regulation of this step can occur through increased HGF availability, enhanced MET expression, or modulation of MET glycosylation, all of which amplify the initial stimulus.
Amplification of Intracellular Signaling Cascades
In simple terms: Once MET is active, positive regulators boost the downstream signals that tell the cell to grow, survive, or move.
Activated MET recruits adaptors such as GAB1 and GRB2, leading to activation of RAS-MAPK, PI3K-AKT, and STAT3 pathways. Positive regulation of HGF response can involve scaffolding proteins that enhance these interactions, or phosphatases that remove inhibitory phosphates, thereby sustaining signaling. In liver myofibroblasts, HGF-induced signaling leads to growth inhibition and apoptosis, and positive regulators could potentiate this effect to resolve cirrhosis.
Feedback and Crosstalk with Other Pathways
In simple terms: Other signals in the cell can either boost or dampen the HGF response, and positive regulators tip the balance toward enhancement.
Crosstalk with integrins, growth factor receptors (e.g., EGFR), and cytokines can modulate HGF responsiveness. For example, inflammatory cytokines may upregulate MET expression, indirectly enhancing HGF response. Positive regulation of GO:2001114 includes such crosstalk mechanisms that sensitize cells to HGF.
Transcriptional and Post-transcriptional Control
In simple terms: Cells can make more MET or other signaling components to become more responsive to HGF.
Transcriptional upregulation of MET or its downstream effectors increases the cellular capacity to respond to HGF. Additionally, microRNAs and RNA-binding proteins can stabilize MET mRNA or enhance translation, contributing to positive regulation. These mechanisms are often activated in regenerative contexts or in tumors.
Biological Outcomes of Enhanced HGF Response
In simple terms: When HGF signaling is boosted, cells may survive better, proliferate, migrate, or undergo specific fates like apoptosis in certain contexts.
Enhanced HGF response can lead to diverse outcomes depending on cell type: in hepatocytes, it promotes survival and proliferation; in liver myofibroblasts, it induces growth inhibition and apoptosis, facilitating resolution of cirrhosis. In cancer cells, it can drive invasion and metastasis. Thus, positive regulation of GO:2001114 is context-dependent and critical for both physiology and disease.
Key Genes Involved in GO:2001114 positive regulation of cellular response to hepatocyte growth factor stimulus
The following genes and proteins are key players in the positive regulation of cellular response to hepatocyte growth factor stimulus, based on their established roles in HGF/MET signaling and related pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HGF | Ligand that binds MET to initiate signaling | Central to GO:2001114; modulation of HGF levels affects response |
| MET | Receptor tyrosine kinase for HGF | Primary mediator; positive regulators often enhance MET expression or activity |
| GAB1 | Scaffolding adaptor protein downstream of MET | Amplifies PI3K-AKT and MAPK signaling; knockout reduces HGF response |
| GRB2 | Adaptor protein linking MET to RAS-MAPK pathway | Essential for HGF-induced proliferation; overexpression enhances response |
| PIK3CA | Catalytic subunit of PI3K | Mediates HGF-induced survival; positive regulation boosts AKT signaling |
| AKT1 | Serine/threonine kinase downstream of PI3K | Promotes cell survival; enhanced activation increases HGF response |
| STAT3 | Transcription factor activated by HGF | Regulates gene expression; positive regulators sustain STAT3 activation |
| MAPK1 | Extracellular signal-regulated kinase 2 (ERK2) | Drives proliferation; enhanced signaling amplifies HGF response |
| MAPK3 | Extracellular signal-regulated kinase 1 (ERK1) | Cooperates with ERK2 in HGF-induced mitogenesis |
| SRC | Non-receptor tyrosine kinase | Modulates MET signaling; can enhance HGF-induced migration |
| PTPN11 | Protein tyrosine phosphatase SHP2 | Positive regulator of RAS-MAPK; mutations increase HGF sensitivity |
| CD44 | Cell surface glycoprotein | Co-receptor for MET; enhances HGF signaling in cancer |
| ITGB1 | Integrin beta 1 | Crosstalk with MET; promotes HGF-induced adhesion and migration |
| EGFR | Epidermal growth factor receptor | Crosstalk enhances HGF response in some contexts |
| VEGFA | Vascular endothelial growth factor A | Indirectly modulated by HGF; positive feedback in angiogenesis |
| MMP2 | Matrix metalloproteinase 2 | Activated by HGF; promotes invasion; can enhance HGF availability |
| TGFB1 | Transforming growth factor beta 1 | Modulates HGF response; context-dependent positive or negative |
| IL6 | Interleukin 6 | Inflammatory cytokine that can upregulate MET expression |
How Is positive regulation of cellular response to hepatocyte growth factor stimulus Regulated?
The positive regulation of cellular response to HGF stimulus is itself tightly regulated at multiple levels. Transcriptional control of MET and its downstream effectors can be influenced by inflammatory cytokines such as IL6, which may upregulate MET expression and sensitize cells to HGF. Post-translational modifications, including phosphorylation and ubiquitination, modulate the stability and activity of signaling intermediates. Feedback loops involving phosphatases (e.g., PTPN11) and microRNAs provide additional layers of control. In liver myofibroblasts, HGF signaling leads to growth inhibition and apoptosis, and positive regulators of this response could be harnessed to resolve cirrhosis. However, the specific molecular mechanisms of positive regulation in different cell types remain an active area of research.
positive regulation of cellular response to hepatocyte growth factor stimulus and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MET | Liver cirrhosis, cancer | Knockout or point mutation in hepatocytes |
| HGF | Liver fibrosis, regeneration | Overexpression in liver myofibroblasts |
| GAB1 | Cancer progression | Knock-in of constitutively active GAB1 |
| PTPN11 | Noonan syndrome, leukemia | Point mutation (e.g., E76K) knock-in |
| STAT3 | Inflammation, cancer | Knockout in immune cells |
Liver Cirrhosis and Fibrosis
HGF is known to promote growth inhibition and apoptosis in liver myofibroblasts, which are key drivers of liver fibrosis and cirrhosis. Positive regulation of HGF response could enhance this anti-fibrotic effect, leading to resolution of cirrhosis. Therefore, identifying positive regulators of GO:2001114 may provide new therapeutic targets for chronic liver diseases.
Cancer Progression and Metastasis
In many cancers, HGF/MET signaling is hyperactivated, promoting tumor growth, angiogenesis, and metastasis. Positive regulators of HGF response can contribute to oncogenesis by amplifying MET signaling. For example, overexpression of GAB1 or PTPN11 mutations can enhance HGF sensitivity in cancer cells. Targeting these positive regulators may overcome resistance to MET inhibitors.
Tissue Regeneration and Wound Healing
HGF is a potent regenerative factor for the liver and other tissues. Positive regulation of HGF response could accelerate tissue repair after injury or partial hepatectomy. Understanding the molecular players involved may lead to strategies to enhance regeneration in clinical settings.
From positive regulation of cellular response to hepatocyte growth factor stimulus-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate HGF-induced MET phosphorylation? | Knockout of gene X in cell lines (e.g., hepatocytes) |
| Does a specific point mutation in gene Y enhance HGF response? | Point mutation knock-in using CRISPR |
| Can overexpression of gene Z amplify HGF-induced apoptosis in myofibroblasts? | Overexpression of gene Z in liver myofibroblasts |
| What is the role of gene W in HGF-mediated tissue regeneration? | Knock-in of tagged gene W for imaging |
| Which genes are essential for HGF response in a genome-wide manner? | CRISPR library screening |
| How does gene V affect HGF signaling in vivo? | Knockout mouse models |
How to Study the positive regulation of cellular response to hepatocyte growth factor stimulus Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Loss-of-function effects on HGF response | Identify positive regulators |
| CRISPR activation screen | Gain-of-function effects on HGF response | Identify genes whose overexpression enhances response |
| Phosphoproteomics | Changes in phosphorylation after HGF stimulation | Map signaling nodes |
| RNA-seq | Transcriptional changes | Identify downstream targets |
| Apoptosis assay | Cell death in myofibroblasts | Measure HGF-induced apoptosis |
| Proliferation assay | Cell growth | Assess HGF-induced mitogenesis |
| Migration assay | Cell motility | Evaluate HGF-induced invasion |
| Immunoblotting | Protein phosphorylation and expression | Validate specific signaling events |
CRISPR-Based Genetic Screens
Genome-wide CRISPR knockout or activation screens can identify positive regulators of HGF response by selecting for cells that survive or proliferate under HGF stimulation. These screens often use readouts such as MET phosphorylation or downstream reporter activity.
Phosphoproteomics
Mass spectrometry-based phosphoproteomics can quantify changes in phosphorylation events after HGF stimulation in cells with candidate gene perturbations, revealing signaling nodes that are enhanced by positive regulators.
Transcriptomics and RNA-seq
RNA sequencing can identify transcriptional programs activated by HGF and how they are amplified by positive regulators, including upregulation of MET or its effectors.
Functional Assays
Cell proliferation, apoptosis, migration, and invasion assays are used to measure the biological outcomes of enhanced HGF response in cells with genetic modifications. For example, in liver myofibroblasts, HGF-induced apoptosis can be quantified to assess positive regulation.
How CRISPR Can Be Used to Study GO:2001114 positive regulation of cellular response to hepatocyte growth factor stimulus
Knockout
CRISPR knockout of candidate positive regulators (e.g., GAB1, GRB2) can abolish or reduce HGF-induced signaling, confirming their essential role in GO:2001114. Knockout models are also used in genome-wide screens to identify novel regulators.
Point Mutation
Introducing specific point mutations (e.g., in PTPN11 or MET) can mimic activating or inactivating states, allowing precise dissection of their role in enhancing HGF response. For example, a gain-of-function mutation in PTPN11 may increase HGF sensitivity.
Knock-in
Knock-in of tagged versions of genes (e.g., GFP-MET) enables live-cell imaging of receptor dynamics and trafficking, providing insights into how positive regulators affect MET localization and stability.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression can elevate levels of candidate genes to test whether they enhance HGF response, as seen with GAB1 or CD44 overexpression. This approach is useful for validating positive regulators identified in screens.
How EDITGENE Supports positive regulation of cellular response to hepatocyte growth factor stimulus Research
Researchers studying positive regulation of cellular response to hepatocyte growth factor stimulus-related genes often need to determine whether a candidate gene is causally involved in enhancing HGF signaling. EDITGENE provides a comprehensive suite of CRISPR-based services to facilitate this research, from knockout to overexpression models, enabling precise functional interrogation of GO:2001114 components.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of cellular response to hepatocyte growth factor stimulus research.
Frequently Asked Questions About positive regulation of cellular response to hepatocyte growth factor stimulus
What is GO:2001114?
GO:2001114 is a Gene Ontology term for any process that activates or increases the frequency, rate or extent of the cellular response to hepatocyte growth factor stimulus.
What genes are involved in positive regulation of cellular response to hepatocyte growth factor stimulus?
Key genes include HGF, MET, GAB1, GRB2, PIK3CA, AKT1, STAT3, MAPK1, MAPK3, SRC, PTPN11, CD44, and ITGB1, among others.
How does HGF signaling work?
HGF binds to the MET receptor, causing it to phosphorylate and activate downstream pathways like RAS-MAPK and PI3K-AKT, which control cell growth, survival, and migration.
Why is positive regulation of HGF response important in liver cirrhosis?
In liver myofibroblasts, HGF promotes growth inhibition and apoptosis, leading to resolution of cirrhosis; positive regulators could enhance this therapeutic effect.
What research methods are used to study GO:2001114?
Methods include CRISPR screens, phosphoproteomics, RNA-seq, and functional assays such as apoptosis and proliferation assays.
Can CRISPR be used to study positive regulators of HGF signaling?
Yes, CRISPR knockout, knock-in, point mutation, and overexpression models are powerful tools to dissect gene function in HGF response.
What diseases are associated with dysregulated HGF signaling?
Diseases include liver cirrhosis, fibrosis, and various cancers where HGF/MET signaling is hyperactivated.
How does EDITGENE support research on GO:2001114?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services to study genes involved in HGF response.
What is the role of MET in HGF response?
MET is the receptor tyrosine kinase that binds HGF and initiates intracellular signaling; its expression and activity are often positively regulated.
Are there clinical applications of targeting positive regulators of HGF response?
Yes, modulating these regulators could enhance liver regeneration or inhibit cancer progression, making them potential therapeutic targets.
Conclusion
GO:2001114, positive regulation of cellular response to hepatocyte growth factor stimulus, is a critical biological process that fine-tunes the cellular response to HGF. Its components are involved in tissue regeneration, fibrosis resolution, and cancer progression. Understanding the molecular mechanisms and identifying key regulators can open new avenues for therapeutic intervention. EDITGENE provides essential CRISPR tools and services to accelerate this research, enabling precise genetic modifications to study GO:2001114 in health and disease.
References
- 1. Kim WH et al.. 2005. Growth inhibition and apoptosis in liver myofibroblasts promoted by hepatocyte growth factor leads to resolution from liver cirrhosis.. Am J Pathol 166(4):1017-28 PMID: 15793283
