GO:0007229 integrin-mediated signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0007229 (integrin-mediated signaling pathway) describes the molecular cascade initiated when an extracellular ligand binds an integrin receptor on the cell surface, culminating in regulation of downstream cellular processes such as transcription.
• Integrins are heterodimeric alpha/beta transmembrane receptors that physically link the extracellular matrix to the actin cytoskeleton and to intracellular signaling kinases such as FAK and SRC.
• The pathway controls adhesion, migration, proliferation, survival and differentiation, and its dysregulation is a hallmark of cancer progression and metastasis.
• Key downstream effectors include focal adhesion kinase (FAK), SRC family kinases, AKT, YAP and STAT3, which together transmit integrin signals to the nucleus.
• Integrin signaling is critical in the tumor microenvironment, where it supports leukemia and solid tumor growth through myeloid and macrophage interactions.
• CRISPR knockout, point-mutation, knock-in and overexpression models enable causal dissection of integrin pathway genes in disease and development.
Description
The integrin-mediated signaling pathway (GO:0007229) is a biological process in which extracellular ligand binding to an integrin receptor on the surface of a target cell triggers a series of molecular signals that end with regulation of a downstream cellular process, for example transcription. Integrins are heterodimeric transmembrane receptors composed of non-covalently associated alpha and beta subunits that mediate cell-extracellular matrix and cell-cell adhesion while simultaneously transmitting biochemical signals into the cell. This dual adhesive and signaling role makes the pathway a central node in tissue development, immune function and cancer biology. Because integrins lack intrinsic enzymatic activity, they propagate signals by recruiting cytoplasmic adaptors and kinases, most prominently focal adhesion kinase (FAK) and SRC family kinases, which in turn activate downstream cascades including AKT, YAP and STAT3. The pathway is therefore best understood as a dynamic mechanochemical system in which ligand occupancy, receptor clustering and cytoskeletal tension are converted into changes in gene expression and cell behavior. For researchers, GO:0007229 provides a structured framework for interrogating how adhesion cues are translated into cell fate decisions. Its components are implicated in tumor invasion, metastasis, immune regulation and bone homeostasis, making it a high-value target for functional genomics and therapeutic development.
integrin-mediated signaling pathway At A Glance
| GO ID | GO:0007229 |
|---|---|
| GO term | integrin-mediated signaling pathway |
| Ontology | biological_process |
| Synonym | integrin-mediated signalling pathway |
| Definition | The series of molecular signals initiated by an extracellular ligand binding to an integrin on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription. |
| Major function | Transduces extracellular matrix and cell-surface ligand cues into intracellular signals that control adhesion, migration, proliferation, survival and gene expression. |
| Key receptors | Heterodimeric alpha/beta integrin transmembrane receptors. |
| Key downstream kinases | FAK, SRC, AKT, YAP and STAT3. |
| Representative ligands | Fibronectin, collagen, laminin and other extracellular matrix proteins. |
What Is GO:0007229?
In our own words, GO:0007229 integrin-mediated signaling pathway is the sequence of molecular events that begins when an extracellular ligand binds to an integrin receptor on the surface of a target cell and ends with the regulation of a downstream cellular process, such as transcription. The term captures both the proximal receptor-proximal events, including integrin activation and clustering, and the distal signaling events that convert adhesion into changes in cell behavior.
Why Is integrin-mediated signaling pathway Important in Cell Biology?
GO:0007229 is important because integrin-mediated signaling sits at the interface between the extracellular environment and intracellular gene regulation, and its dysregulation contributes to cancer progression, immune dysfunction and impaired tissue homeostasis. Understanding this pathway supports the development of targeted therapies and functional genomics models that test causal roles of individual integrin pathway components.
• Controls cell adhesion, migration and invasion, processes central to tumor metastasis.
• Regulates proliferation and survival through FAK, SRC and AKT signaling.
• Supports tumor-microenvironment crosstalk, including myeloid-mediated support of T-cell acute lymphoblastic leukemia.
• Reprograms macrophages in the liver and accelerates colorectal cancer metastasis.
• Promotes gastric cancer progression via integrin/FAK/SRC-mediated IL-6/STAT3 activation.
• Regulates MT1-MMP phosphorylation to promote tumor cell invasion.
• Is essential for T lymphocyte signaling and immune function.
• Contributes to osteoblast differentiation and bone homeostasis through fibronectin 1/integrin-mediated FAK/AKT signaling.
• Provides a rich source of therapeutic targets for integrin pathway inhibitors.
• Offers tractable CRISPR targets for causal validation in disease models.
What Happens During integrin-mediated signaling pathway?
Ligand binding and integrin activation
In simple terms: An outside molecule docks onto an integrin receptor and switches it on.
The pathway begins when an extracellular ligand, such as fibronectin or another matrix protein, binds to the extracellular domain of an integrin heterodimer on the target cell surface. This binding, together with conformational changes in the integrin, converts the receptor from a low-affinity to a high-affinity state and promotes receptor clustering.
Receptor clustering and cytoskeletal coupling
In simple terms: Activated integrins group together and grab the cell's internal skeleton.
Clustered integrins recruit cytoplasmic adaptor proteins and link to the actin cytoskeleton, forming focal adhesions that serve as signaling platforms. This coupling allows mechanical tension and ligand occupancy to be translated into biochemical signals.
FAK and SRC activation
In simple terms: Two key enzymes inside the cell are switched on to relay the signal.
Focal adhesion kinase (FAK) is recruited to clustered integrins and autophosphorylates, creating docking sites for SRC family kinases. The FAK/SRC complex then phosphorylates downstream substrates that propagate the signal.
Downstream kinase cascades
In simple terms: The signal spreads through a chain of molecular switches.
FAK/SRC signaling activates downstream pathways including AKT, YAP and STAT3, which regulate survival, proliferation and transcription. Integrin signaling also regulates MT1-MMP phosphorylation to promote tumor cell invasion.
Transcriptional and cellular outcomes
In simple terms: The signal reaches the nucleus and changes what the cell does.
The cascade ends with regulation of downstream cellular processes such as transcription, leading to changes in proliferation, migration, differentiation or survival. In immune cells, beta 1-integrin-mediated signaling shapes T lymphocyte responses.
Key Genes Involved in GO:0007229 integrin-mediated signaling pathway
The following genes and proteins are central to integrin-mediated signaling pathway (GO:0007229) and are frequently studied in functional genomics experiments.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ITGB1 | Beta 1 integrin subunit; forms heterodimers that mediate adhesion and signaling | Regulates T lymphocyte signaling and tumor cell invasion |
| ITGA5 | Alpha 5 integrin subunit; pairs with beta 1 to bind fibronectin | Involved in fibronectin 1/integrin-mediated FAK/AKT signaling in osteoblasts |
| PTK2 | Focal adhesion kinase (FAK); proximal integrin effector kinase | Central node in integrin/FAK/SRC signaling in cancer |
| SRC | SRC family kinase; partners with FAK to propagate integrin signals | Drives IL-6/STAT3 activation in gastric cancer |
| AKT1 | Serine/threonine kinase downstream of FAK | Mediates integrin-dependent survival and osteoblast differentiation |
| YAP1 | Transcriptional co-activator downstream of integrin signaling | Required for integrin/FAK/SRC-mediated STAT3 activation |
| STAT3 | Transcription factor activated downstream of integrin signaling | Promotes gastric cancer progression |
| IL6 | Cytokine induced by integrin signaling | Links integrin signaling to STAT3 activation |
| MMP14 | MT1-MMP; membrane metalloproteinase regulated by beta 1 integrin | Promotes tumor cell invasion |
| TIMP1 | Tissue inhibitor of metalloproteinases 1; integrin-mediated signaling effector | Reprograms liver macrophages and accelerates colorectal cancer metastasis |
| VPS35 | Retromer component that promotes integrin/FAK/SRC signaling | Drives gastric cancer progression |
| NELL2 | Osteoinductive factor acting through fibronectin 1/integrin signaling | Regulates osteoblast differentiation and bone homeostasis |
| FN1 | Fibronectin 1; extracellular ligand for integrins | Ligand in NELL2-driven FAK/AKT signaling |
| ITGAL | Alpha L integrin subunit; immune cell adhesion receptor | Relevant to leukocyte integrin signaling |
| ITGB2 | Beta 2 integrin subunit; immune cell adhesion receptor | Relevant to leukocyte integrin signaling |
| ITGAV | Alpha V integrin subunit; binds multiple matrix ligands | Targeted in integrin pathway therapeutic strategies |
| ITGB3 | Beta 3 integrin subunit; platelet and tumor integrin | Targeted in integrin pathway therapeutic strategies |
| ITGA4 | Alpha 4 integrin subunit; immune and neural adhesion | Relevant to integrin-mediated signaling in multiple tissues |
How Is integrin-mediated signaling pathway Regulated?
Integrin-mediated signaling is regulated at multiple levels, including ligand availability, integrin conformational activation, receptor clustering and cytoskeletal tension. Downstream, the pathway intersects with kinase cascades such as FAK/SRC, AKT, YAP and STAT3, which provide feedback and amplification. Integrin signaling also regulates MT1-MMP phosphorylation, linking adhesion to extracellular matrix remodeling. In immune cells, beta 1-integrin-mediated signaling is tightly controlled to shape T lymphocyte responses.
integrin-mediated signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ITGB1 | Tumor cell invasion and T lymphocyte signaling | Knockout in cancer cell lines and T cells |
| PTK2 | Gastric cancer progression via FAK/SRC signaling | Knockout or point-mutation in gastric cancer cells |
| VPS35 | Gastric cancer progression through integrin/FAK/SRC | Knockout in gastric cancer cells |
| TIMP1 | Colorectal cancer metastasis and macrophage reprogramming | Knockout in liver macrophage models |
| NELL2 | Osteoblast differentiation and bone homeostasis | Knockout or overexpression in osteoblast models |
Cancer progression and metastasis
Integrin-mediated signaling promotes tumor cell invasion, survival and metastasis through FAK/SRC, AKT and STAT3 pathways. Integrin-mediated TIMP1 signaling reprograms liver macrophages and accelerates colorectal cancer metastasis. VPS35 promotes gastric cancer progression through integrin/FAK/SRC-mediated IL-6/STAT3 activation in a YAP-dependent manner.
Leukemia and the tumor microenvironment
Integrin signaling is critical for myeloid-mediated support of T-cell acute lymphoblastic leukemia, highlighting its role in the bone marrow microenvironment. Beta 1-integrin-mediated signaling also regulates T lymphocyte function, linking integrin biology to immune cell behavior.
Bone homeostasis and osteoblast differentiation
NELL2, a novel osteoinductive factor, regulates osteoblast differentiation and bone homeostasis through fibronectin 1/integrin-mediated FAK/AKT signaling. This illustrates how integrin signaling contributes to skeletal biology beyond cancer.
Therapeutic targeting of integrin pathways
Targeting integrin pathways has emerged as a therapeutic strategy, with mechanisms and advances reviewed across multiple disease contexts. Understanding pathway components supports rational design of inhibitors and CRISPR-based validation studies.
From integrin-mediated signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate integrin pathway gene required for tumor cell invasion? | CRISPR knockout in cancer cell lines |
| Does a specific integrin residue control downstream FAK activation? | Point-mutation knock-in of the integrin gene |
| Can a disease-associated variant alter integrin signaling? | Knock-in of the variant allele |
| Where does a pathway protein localize in focal adhesions? | Tagged knock-in with fluorescent or epitope tag |
| Does overexpression of a ligand drive osteoblast differentiation? | Overexpression of NELL2 or FN1 in osteoblast models |
| Does loss of a pathway gene alter immune cell support of leukemia? | Knockout in myeloid or leukemia co-culture models |
How to Study the integrin-mediated signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Loss-of-function effects on integrin-dependent phenotypes | Identifying required pathway genes |
| Phosphoproteomics | Phosphorylation of FAK, SRC, AKT and substrates | Mapping integrin signaling cascades |
| Immunoblotting | Activation state of pathway kinases | Validating signaling changes after perturbation |
| Live-cell imaging | Integrin clustering and focal adhesion dynamics | Studying adhesion and migration |
| RNA sequencing | Transcriptional outputs of integrin signaling | Defining downstream gene expression changes |
| Cytokine profiling | Secretion of IL-6 and related factors | Linking integrin signaling to inflammation |
| Co-culture assays | Tumor-immune or tumor-stroma interactions | Modeling microenvironment support |
| Invasion assays | Matrix degradation and cell invasion capacity | Testing MT1-MMP and integrin function |
CRISPR functional genomics
CRISPR knockout and knock-in screens allow systematic interrogation of integrin pathway genes for roles in adhesion, migration and proliferation. These approaches provide causal evidence linking specific genes to GO:0007229-dependent phenotypes.
Phosphoproteomics and signaling assays
Phosphoproteomic and immunoblot analyses measure activation of FAK, SRC, AKT and STAT3 downstream of integrin engagement. Such assays quantify pathway activity and identify feedback nodes.
Imaging of focal adhesions
Fluorescence and live-cell imaging of tagged integrins and focal adhesion proteins reveal receptor clustering, cytoskeletal coupling and dynamics. These methods connect molecular events to cell morphology and migration.
Transcriptional and cytokine profiling
RNA sequencing and cytokine profiling measure transcriptional outputs of integrin signaling, including IL-6 and STAT3 target genes. They are used to define downstream cellular outcomes of the pathway.
How CRISPR Can Be Used to Study GO:0007229 integrin-mediated signaling pathway
Knockout
CRISPR knockout of integrin subunits or downstream kinases such as PTK2 and SRC removes pathway components and reveals their requirement for adhesion, migration and proliferation. Knockout models are widely used to test causal roles in cancer and immune biology.
Point Mutation
Point-mutation knock-in can alter specific phosphorylation sites or ligand-binding residues within integrin pathway proteins, allowing precise structure-function dissection. Such models help distinguish signaling from adhesion functions.
Knock-in
Knock-in of tagged or variant alleles enables tracking of integrin pathway proteins and testing of disease-associated variants in endogenous regulatory contexts. This approach supports imaging and biochemical studies of focal adhesions.
Overexpression
Overexpression of ligands such as NELL2 or FN1, or of pathway kinases, can amplify integrin signaling and test sufficiency in processes like osteoblast differentiation. Overexpression models complement loss-of-function studies.
How EDITGENE Supports integrin-mediated signaling pathway Research
Researchers studying integrin-mediated signaling pathway-related genes often need to determine whether a candidate gene is causally involved in adhesion, migration, proliferation or disease progression, and CRISPR-based models provide the most direct way to test this.
Contact EDITGENE today to design your custom CRISPR model for integrin-mediated signaling pathway research.
Frequently Asked Questions About integrin-mediated signaling pathway
What is GO:0007229 integrin-mediated signaling pathway?
GO:0007229 is a biological process describing the series of molecular signals initiated by an extracellular ligand binding to an integrin on the cell surface and ending with regulation of a downstream cellular process such as transcription.
What genes are involved in integrin-mediated signaling pathway?
Key genes include ITGB1, ITGA5, PTK2 (FAK), SRC, AKT1, YAP1, STAT3, IL6, MMP14, TIMP1, VPS35, NELL2 and FN1.
What happens during integrin-mediated signaling?
Ligand binding activates and clusters integrins, which recruit FAK and SRC, activate downstream cascades such as AKT, YAP and STAT3, and ultimately regulate transcription and cell behavior.
Why is integrin-mediated signaling important in cancer?
It promotes tumor cell invasion, survival and metastasis, and supports tumor-microenvironment interactions such as myeloid support of leukemia.
How is integrin-mediated signaling regulated?
It is regulated by ligand availability, integrin conformational activation, receptor clustering, cytoskeletal tension and downstream kinase feedback involving FAK, SRC, AKT, YAP and STAT3.
What diseases are linked to integrin-mediated signaling?
Cancers including gastric and colorectal cancer, leukemia, and bone homeostasis disorders have been linked to this pathway.
How do researchers study integrin-mediated signaling pathway?
Common methods include CRISPR knockout and knock-in, phosphoproteomics, immunoblotting, live-cell imaging, RNA sequencing and invasion assays.
What is the role of FAK in integrin-mediated signaling?
FAK (PTK2) is a proximal kinase recruited to clustered integrins that autophosphorylates and recruits SRC to propagate downstream signals.
Can CRISPR be used to study integrin-mediated signaling?
Yes, CRISPR knockout, point-mutation, knock-in and overexpression models allow causal testing of integrin pathway genes in disease and development.
What is the synonym for GO:0007229?
The synonym is integrin-mediated signalling pathway.
Conclusion
GO:0007229 integrin-mediated signaling pathway defines the molecular cascade that converts extracellular ligand binding to integrins into changes in transcription and cell behavior. Its components, including integrin subunits, FAK, SRC, AKT, YAP and STAT3, are central to cancer progression, immune regulation and bone homeostasis. CRISPR-based knockout, point-mutation, knock-in and overexpression models provide rigorous tools to dissect this pathway and to validate therapeutic targets. Researchers can leverage these approaches to connect specific genes to integrin-dependent phenotypes in disease-relevant systems.
References
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- 2. Lyu A et al.. 2023. Integrin signaling is critical for myeloid-mediated support of T-cell acute lymphoblastic leukemia.. Nat Commun 14(1):6270 PMID: 37805579
- 3. Yuan H et al.. 2025. NELL2, a novel osteoinductive factor, regulates osteoblast differentiation and bone homeostasis through fibronectin 1/integrin-mediated FAK/AKT signaling.. Bone Res 13(1):46 PMID: 40210857
- 4. Liu J et al.. 2025. Integrin-Mediated TIMP1 Signaling Reprograms Liver Macrophages and Accelerates Colorectal Cancer Metastasis.. Cells 15(1) PMID: 41511313
- 5. Zhou Q et al.. 2024. VPS35 promotes gastric cancer progression through integrin/FAK/SRC signalling-mediated IL-6/STAT3 pathway activation in a YAP-dependent manner.. Oncogene 43(2):106-122 PMID: 37950040
- 6. Grafinger OR et al.. 2020. β1 integrin-mediated signaling regulates MT1-MMP phosphorylation to promote tumor cell invasion.. J Cell Sci 133(9) PMID: 32205364
- 7. Iwata S et al.. 2000. Beta 1-integrin-mediated cell signaling in T lymphocytes.. J Dermatol Sci 23(2):75-86 PMID: 10808124
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