GO:0035602 fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell: Apoptosis Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0035602 describes a biological process in which fibroblast growth factor receptor (FGFR) signaling suppresses apoptosis specifically in bone marrow cells.
• The term integrates two concepts: FGFR ligand binding and downstream negative regulation of programmed cell death in the bone marrow microenvironment.
• FGF-8, a ligand for FGFR, stimulates expression of NR4A orphan nuclear receptors in osteoblasts, which are key bone marrow stromal cells.
• In bone marrow endothelial cells, humoral inhibitors associated with liver cirrhosis alter cytokine gene expression, implicating FGFR-related pathways in bone marrow vascular biology.
• Dysregulation of this pathway may contribute to hematological disorders, including leukemias and bone marrow failure syndromes.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are essential to dissect the causal role of FGFR signaling components in bone marrow cell survival.
Description
The Gene Ontology (GO) term GO:0035602, fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell, defines a specialized biological process where fibroblast growth factor receptors (FGFRs) transmit signals that prevent or reduce apoptosis in bone marrow cells. This term is critical for understanding how the bone marrow microenvironment maintains cell survival and homeostasis, particularly under stress or disease conditions. FGFR signaling is known to influence cell proliferation, differentiation, and survival across many tissues, but its specific role in bone marrow apoptosis regulation has gained attention due to implications in hematological malignancies and bone marrow failure. Research on this process has been propelled by studies showing that FGF-8, an FGFR ligand, stimulates the expression of NR4A orphan nuclear receptors in osteoblasts, which are essential components of the bone marrow niche. Additionally, whole-genome expression profiling in human bone marrow endothelial cells has revealed that humoral inhibitors in liver cirrhosis modulate cytokine genes, suggesting that FGFR-related pathways may be perturbed in systemic diseases affecting the bone marrow. These findings underscore the importance of GO:0035602 in both normal hematopoiesis and disease pathogenesis. For researchers, GO:0035602 provides a framework to investigate how FGFR signaling components can be targeted to modulate bone marrow cell survival, with potential therapeutic applications in leukemia, myelodysplastic syndromes, and bone marrow transplantation. Understanding this pathway at the molecular level is essential for developing precise interventions that either promote or inhibit apoptosis in bone marrow cells as needed.
fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell At A Glance
| GO ID | GO:0035602 |
|---|---|
| GO term | fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell |
| Ontology | biological_process |
| Synonym | FGF receptor signaling pathway involved in negative regulation of apoptosis in bone marrow; FGFR signaling pathway involved in negative regulation of apoptosis in bone marrow; fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptosis in bone marrow; fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow; fibroblast growth factor receptor signalling pathway involved in negative regulation of apoptotic process in bone marrow |
| Major function | Negative regulation of apoptosis in bone marrow cells via FGFR signaling |
| Related ligands | FGF-8 and other fibroblast growth factors |
| Related receptors | Fibroblast growth factor receptors (FGFRs) |
| Key downstream effectors | NR4A orphan nuclear receptors |
| Bone marrow cell types involved | Osteoblasts, endothelial cells, hematopoietic cells |
What Is GO:0035602?
GO:0035602 is defined as the series of molecular signals generated as a consequence of a fibroblast growth factor receptor binding to one of its physiological ligands, which stops, prevents, or reduces the frequency, rate or extent of the occurrence or rate of cell death by apoptotic process in the bone marrow. In simpler terms, it is the process by which FGFR activation sends survival signals that protect bone marrow cells from undergoing programmed cell death.
Why Is fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell Important in Cell Biology?
GO:0035602 is important because it defines a specific survival mechanism in the bone marrow, a tissue responsible for lifelong blood cell production. Dysregulation of FGFR signaling and apoptosis in bone marrow cells is linked to hematological disorders such as leukemia, myelodysplastic syndromes, and bone marrow failure. Understanding this pathway provides insights into how the bone marrow microenvironment supports cell survival and how these processes can be therapeutically targeted.
• Maintains bone marrow cell survival by preventing apoptosis through FGFR signaling.
• Involved in hematological malignancies where apoptotic evasion is a hallmark.
• FGF-8 stimulates NR4A receptors in osteoblasts, linking FGFR signaling to bone marrow niche function.
• Altered cytokine expression in bone marrow endothelial cells under liver cirrhosis suggests systemic disease impact.
• Potential target for therapies aiming to modulate apoptosis in bone marrow failure or leukemia.
• Provides a framework for studying FGFR signaling in tissue-specific apoptosis regulation.
• Relevant to bone marrow transplantation and hematopoietic stem cell maintenance.
• Helps explain how the bone marrow microenvironment responds to stress and injury.
What Happens During fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell?
Ligand Binding and FGFR Activation
In simple terms: A growth factor molecule docks onto a receptor on the bone marrow cell surface, switching the receptor on.
The process begins when a fibroblast growth factor (FGF) ligand, such as FGF-8, binds to a fibroblast growth factor receptor (FGFR) on the surface of bone marrow cells. This binding induces receptor dimerization and autophosphorylation, activating the receptor's intrinsic tyrosine kinase activity. In osteoblasts, FGF-8 has been shown to stimulate the expression of NR4A orphan nuclear receptors, which are downstream effectors of FGFR signaling.
Intracellular Signal Transduction
In simple terms: The activated receptor triggers a chain of molecular signals inside the cell.
Activated FGFR phosphorylates downstream adaptor proteins and initiates signaling cascades, including the MAPK/ERK and PI3K/AKT pathways, which are known to promote cell survival. These pathways ultimately lead to changes in gene expression that favor anti-apoptotic programs. In bone marrow endothelial cells, humoral inhibitors associated with liver cirrhosis have been shown to modulate cytokine gene expression, suggesting that FGFR signaling intersects with cytokine networks in the bone marrow microenvironment.
Negative Regulation of Apoptosis
In simple terms: The survival signals block the cell's self-destruction machinery.
The downstream effectors of FGFR signaling, including NR4A receptors, inhibit pro-apoptotic proteins and promote anti-apoptotic factors, thereby reducing the frequency of apoptosis in bone marrow cells. This negative regulation of apoptosis is critical for maintaining adequate numbers of hematopoietic cells and supporting bone marrow function.
Integration with Bone Marrow Microenvironment
In simple terms: The survival signals are influenced by the surrounding bone marrow cells and factors.
The bone marrow microenvironment, including osteoblasts and endothelial cells, provides ligands and cofactors that modulate FGFR signaling. For example, FGF-8 produced by osteoblasts can act on neighboring cells to promote survival. Additionally, systemic conditions such as liver cirrhosis can alter the secretion of humoral inhibitors that affect bone marrow endothelial cell gene expression, potentially impacting FGFR-mediated survival.
Key Genes Involved in GO:0035602 fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell
The following genes and proteins are involved in the fibroblast growth factor receptor signaling pathway that negatively regulates apoptosis in bone marrow cells, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FGF8 | Ligand for FGFR; stimulates NR4A expression in osteoblasts | Key activator of survival signaling in bone marrow niche |
| FGFR1 | Fibroblast growth factor receptor; initiates signaling upon ligand binding | Primary receptor mediating anti-apoptotic effects |
| FGFR2 | Fibroblast growth factor receptor; alternative receptor for FGF ligands | Potential compensatory or tissue-specific roles |
| FGFR3 | Fibroblast growth factor receptor; involved in bone development | May influence bone marrow stromal cell survival |
| NR4A1 | Orphan nuclear receptor; downstream effector of FGF-8 signaling | Mediates anti-apoptotic gene expression |
| NR4A2 | Orphan nuclear receptor; induced by FGF-8 | Contributes to survival signaling in osteoblasts |
| NR4A3 | Orphan nuclear receptor; FGF-8 target | Potential role in bone marrow cell survival |
| MAPK1 | Kinase in MAPK/ERK pathway downstream of FGFR | Transmits survival signals |
| MAPK3 | Kinase in MAPK/ERK pathway downstream of FGFR | Transmits survival signals |
| AKT1 | Kinase in PI3K/AKT pathway downstream of FGFR | Promotes cell survival |
| PIK3CA | Catalytic subunit of PI3K; activates AKT | Key mediator of FGFR survival signaling |
| BCL2 | Anti-apoptotic protein; downstream target of survival pathways | Inhibits apoptosis in bone marrow cells |
| BAX | Pro-apoptotic protein; inhibited by survival signaling | Effector of apoptosis; counteracted by FGFR pathway |
| CASP3 | Executioner caspase; cleaved during apoptosis | Apoptosis marker; suppressed by FGFR signaling |
| IL6 | Cytokine; modulated in bone marrow endothelial cells | Links inflammation to bone marrow microenvironment |
| CXCL8 | Chemokine; altered by humoral inhibitors in liver cirrhosis | Potential mediator of bone marrow endothelial cell survival |
| VEGFA | Growth factor; expressed in bone marrow endothelial cells | May interact with FGFR signaling in angiogenesis |
How Is fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell Regulated?
The FGFR signaling pathway involved in negative regulation of apoptosis in bone marrow cells is regulated at multiple levels. Ligand availability, such as FGF-8 secretion by osteoblasts, controls receptor activation. Receptor expression levels and alternative splicing of FGFR isoforms can modulate signal strength. Downstream effectors like NR4A receptors are transcriptionally regulated by FGF-8. Additionally, humoral factors in systemic diseases such as liver cirrhosis can alter cytokine networks in bone marrow endothelial cells, indirectly influencing FGFR signaling. Cross-talk with other signaling pathways, including MAPK/ERK and PI3K/AKT, provides additional layers of regulation.
fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FGF8 | Leukemia; promotes survival of malignant cells | Knockout of FGF8 in bone marrow stromal cells |
| FGFR1 | Myeloproliferative disorders; aberrant signaling | Point mutation in FGFR1 kinase domain |
| NR4A1 | Leukemia; anti-apoptotic effector | Overexpression of NR4A1 in hematopoietic cells |
| IL6 | Liver cirrhosis-associated bone marrow dysfunction | Knock-in of IL6 reporter in endothelial cells |
| CXCL8 | Inflammation-driven bone marrow changes | Knockout of CXCL8 in bone marrow endothelial cells |
Hematological Malignancies
Dysregulation of FGFR signaling and apoptosis in bone marrow cells is implicated in hematological malignancies such as leukemia, where cancer cells evade apoptosis. Overactivation of FGFR pathways can promote survival of malignant hematopoietic cells, contributing to disease progression. Understanding GO:0035602 may inform targeted therapies that restore apoptotic sensitivity in leukemia cells.
Bone Marrow Failure Syndromes
In bone marrow failure syndromes, excessive apoptosis of hematopoietic cells leads to cytopenias. Impaired FGFR-mediated survival signaling could contribute to increased apoptosis in the bone marrow microenvironment. Modulating this pathway might offer therapeutic strategies to enhance bone marrow cell survival.
Liver Cirrhosis and Bone Marrow Dysfunction
Liver cirrhosis is associated with altered humoral inhibitors that affect bone marrow endothelial cells, as shown by whole-genome expression profiling. These changes in cytokine gene expression may disrupt FGFR signaling and apoptosis regulation in the bone marrow, linking liver disease to hematological complications.
From fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does FGFR1 mediate anti-apoptotic signaling in bone marrow cells? | FGFR1 knockout in hematopoietic cell lines |
| What is the role of FGF-8 in osteoblast-induced survival? | FGF8 knockout in osteoblast cell lines |
| How does NR4A1 contribute to apoptosis resistance? | NR4A1 overexpression in bone marrow stromal cells |
| Does a specific FGFR2 mutation alter ligand binding? | Point mutation knock-in of FGFR2 in bone marrow cells |
| Can tagged FGFR1 track receptor trafficking? | Knock-in of fluorescent tag on FGFR1 |
| What genes are regulated by FGFR signaling in bone marrow? | CRISPR library screening in bone marrow cell lines |
How to Study the fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify downstream targets of FGFR signaling |
| Annexin V/PI flow cytometry | Apoptosis rate | Quantify negative regulation of apoptosis |
| Caspase activity assay | Caspase-3/7 activity | Measure apoptotic execution |
| Co-immunoprecipitation | Protein-protein interactions | Map FGFR signaling complexes |
| Mass spectrometry | Protein identification and quantification | Discover novel pathway components |
| CRISPR knockout screening | Gene essentiality | Identify survival genes in bone marrow cells |
| Western blot | Protein expression and phosphorylation | Validate signaling activation |
| Immunofluorescence | Protein localization | Visualize FGFR and NR4A in bone marrow cells |
Transcriptomic Profiling
RNA-seq can be used to identify global gene expression changes following FGFR activation or inhibition in bone marrow cells. This approach has been used to profile cytokine genes in bone marrow endothelial cells treated with humoral inhibitors. It helps uncover downstream effectors of the anti-apoptotic pathway.
Apoptosis Assays
Flow cytometry with Annexin V/PI staining and caspase activity assays can quantify apoptosis rates in bone marrow cells under FGFR modulation. These methods directly measure the negative regulation of apoptosis described in GO:0035602.
Protein-Protein Interaction Studies
Co-immunoprecipitation and mass spectrometry can identify proteins interacting with FGFR and its downstream effectors like NR4A receptors. These techniques help map the signaling complexes involved in survival signaling.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes that are essential for FGFR-mediated survival in bone marrow cells. This unbiased approach can reveal novel regulators of the pathway and potential therapeutic targets.
How CRISPR Can Be Used to Study GO:0035602 fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell
Knockout
CRISPR knockout of FGFR1, FGF8, or NR4A1 in bone marrow cell lines can abolish the anti-apoptotic signaling, leading to increased apoptosis. This approach helps establish causality between specific genes and the negative regulation of apoptosis in bone marrow cells.
Point Mutation
Introducing point mutations in the kinase domain of FGFR1 or in the ligand-binding domain of FGF8 can dissect the molecular requirements for survival signaling. Such models can reveal how specific residues contribute to receptor activation and downstream anti-apoptotic effects.
Knock-in
Knock-in of fluorescent or affinity tags on FGFR1 or NR4A1 allows real-time tracking of protein localization and interactions in bone marrow cells. This can provide insights into the spatiotemporal dynamics of the survival pathway.
Overexpression
Overexpression of FGF8 or NR4A1 in bone marrow cells can enhance anti-apoptotic signaling and protect cells from stress-induced apoptosis. This model is useful for studying gain-of-function effects and potential oncogenic roles.
How EDITGENE Supports fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell Research
Researchers studying fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell-related genes often need to determine whether a candidate gene is causally involved in this survival pathway. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of genes implicated in GO:0035602.
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Frequently Asked Questions About fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell
What is GO:0035602?
GO:0035602 is a Gene Ontology biological process term describing the fibroblast growth factor receptor signaling pathway that negatively regulates apoptosis in bone marrow cells.
What genes are involved in fibroblast growth factor receptor signaling pathway involved in negative regulation of apoptotic process in bone marrow cell?
Key genes include FGF8, FGFR1, FGFR2, FGFR3, NR4A1, NR4A2, NR4A3, MAPK1, MAPK3, AKT1, and BCL2, among others.
How does FGFR signaling prevent apoptosis in bone marrow cells?
FGFR activation by ligands such as FGF-8 triggers downstream pathways (MAPK/ERK, PI3K/AKT) that promote anti-apoptotic gene expression and inhibit pro-apoptotic proteins.
What is the role of FGF-8 in bone marrow?
FGF-8 stimulates the expression of NR4A orphan nuclear receptors in osteoblasts, which are part of the bone marrow niche and support cell survival.
Which diseases are associated with dysregulation of this pathway?
Dysregulation is implicated in hematological malignancies like leukemia, bone marrow failure syndromes, and bone marrow dysfunction associated with liver cirrhosis.
How can CRISPR be used to study GO:0035602?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of genes involved in FGFR-mediated survival in bone marrow cells.
What experimental methods are used to study this pathway?
Common methods include RNA-seq, apoptosis assays, co-immunoprecipitation, mass spectrometry, and CRISPR screens.
What cell types are involved in this process?
Osteoblasts, endothelial cells, and hematopoietic cells in the bone marrow are key players.
Is NR4A1 a downstream effector of FGFR signaling?
Yes, FGF-8 induces NR4A1 expression in osteoblasts, and NR4A1 contributes to anti-apoptotic signaling.
How does liver cirrhosis affect bone marrow endothelial cells?
Humoral inhibitors in liver cirrhosis alter cytokine gene expression in bone marrow endothelial cells, potentially impacting FGFR-related survival pathways.
Conclusion
GO:0035602 defines a critical survival mechanism in the bone marrow, where FGFR signaling suppresses apoptosis to maintain hematopoietic homeostasis. Dysregulation of this pathway is linked to hematological diseases, making it a promising target for therapeutic intervention. Continued research using advanced CRISPR models and multi-omics approaches will further elucidate the molecular players and regulatory networks involved.
References
- 1. Lammi J et al.. 2008. FGF-8 stimulates the expression of NR4A orphan nuclear receptors in osteoblasts.. Mol Cell Endocrinol 295(1-2):87-93 PMID: 18809462
- 2. Gao B et al.. 2013. Whole genome expression profiling and screening for differentially expressed cytokine genes in human bone marrow endothelial cells treated with humoral inhibitors in liver cirrhosis.. Int J Mol Med 32(5):1204-14 PMID: 24043211
