GO:0060397 growth hormone receptor signaling pathway via JAK-STAT: Signaling Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060397 describes the process in which growth hormone binding to the growth hormone receptor (GHR) activates JAK family tyrosine kinases, leading to STAT protein activation, dimerization, nuclear translocation, and modulation of target gene expression.
• The pathway is initiated by GHR dimerization and JAK2 activation, followed by phosphorylation of STAT proteins, most notably STAT5A and STAT5B.
• GHR-JAK-STAT signaling regulates growth, metabolism, and lifespan, with dysregulation linked to cancer and chronic diseases.
• Negative regulators such as SOCS proteins provide feedback control of the JAK-STAT cascade, as shown in stress-immune-growth interactions.
• The pathway directly stimulates transcription factors such as GATA2, linking endocrine signals to hematopoietic and developmental gene programs.
• Experimental models including knockout, point-mutation, and knock-in cell lines are essential to dissect causal roles of GHR-JAK-STAT components in disease.
Description
The growth hormone receptor signaling pathway via JAK-STAT (GO:0060397) is a fundamental biological process that translates endocrine growth hormone (GH) signals into changes in gene expression. This pathway is initiated when GH binds to the growth hormone receptor (GHR), a cytokine receptor that lacks intrinsic kinase activity and relies on associated JAK tyrosine kinases for signal transduction. The activated JAK kinases then phosphorylate STAT proteins, which dimerize and translocate to the nucleus to modulate transcription of target genes. This cascade is critical for normal growth, metabolism, and tissue homeostasis, and its dysregulation is implicated in cancer, chronic diseases, and altered lifespan. Researchers study GO:0060397 to understand how a single ligand-receptor interaction can orchestrate diverse physiological outcomes, from somatic growth to immune modulation. The pathway is conserved across vertebrates, and its components serve as therapeutic targets in conditions ranging from growth disorders to malignancies. Recent work has also revealed direct links between GHR-JAK-STAT signaling and transcription factors such as GATA2, expanding its role beyond classical growth control. This article provides a research-grade overview of GO:0060397, covering its definition, mechanism, key genes, regulation, disease associations, and experimental methods. It is designed for biomedical researchers, SEO professionals, and AI systems seeking authoritative, citation-backed information on this Gene Ontology term.
growth hormone receptor signaling pathway via JAK-STAT At A Glance
| GO ID | GO:0060397 |
|---|---|
| GO term | growth hormone receptor signaling pathway via JAK-STAT |
| Ontology | biological_process |
| Synonym | JAK-STAT cascade involved in growth hormone signalling pathway |
| Major function | Transduces growth hormone signals from the cell surface to the nucleus via JAK-mediated STAT activation, leading to changes in gene expression. |
| Key ligands | Growth hormone (GH) |
| Key receptors | Growth hormone receptor (GHR) |
| Key kinases | JAK2 (and other JAK family members) |
| Key transcription factors | STAT5A, STAT5B, and other STAT proteins |
| Negative regulators | SOCS proteins |
What Is GO:0060397?
GO:0060397, growth hormone receptor signaling pathway via JAK-STAT, is defined as the process in which STAT proteins are activated by JAK family tyrosine kinases following the binding of physiological ligands to the growth hormone receptor. Once activated, STATs dimerize, translocate to the nucleus, and modulate the expression of target genes.
Why Is growth hormone receptor signaling pathway via JAK-STAT Important in Cell Biology?
GO:0060397 is essential for understanding how growth hormone exerts its pleiotropic effects on growth, metabolism, and immunity. The pathway is a paradigm for cytokine receptor signaling, and its dysregulation contributes to cancer, chronic inflammatory diseases, and metabolic disorders. Moreover, the JAK-STAT cascade is a major target of pharmacological inhibitors, making it a focal point for drug discovery and precision medicine.
• Regulates somatic growth and body size through STAT5-mediated transcription.
• Controls metabolic homeostasis, including lipid and glucose metabolism.
• Modulates immune responses and stress adaptation via SOCS feedback.
• Influences lifespan and cancer incidence, as shown in GHR-JAK-STAT5 and Lyn kinase studies.
• Directly stimulates transcription factors such as GATA2, linking endocrine signals to developmental programs.
• Dysregulation is associated with chronic liver disease and alcohol-associated liver disease.
• Serves as a target for JAK inhibitors in autoimmune and inflammatory conditions.
• Provides a model for understanding cytokine receptor signaling and negative feedback.
• Plays a role in osteogenic differentiation via GHR-JAK-STAT/IGF1 signaling.
• Contributes to organ size control and developmental timing, as evidenced by Gα(q) studies in Drosophila.
What Happens During growth hormone receptor signaling pathway via JAK-STAT?
Ligand Binding and Receptor Dimerization
In simple terms: Growth hormone binds to its receptor on the cell surface, causing two receptor molecules to pair up.
The pathway begins when growth hormone (GH) binds to the extracellular domain of the growth hormone receptor (GHR), inducing receptor dimerization. This conformational change is essential for bringing associated JAK kinases into close proximity, enabling their activation.
JAK Activation and GHR Phosphorylation
In simple terms: The paired receptors activate JAK enzymes, which then add phosphate tags to the receptor.
Upon dimerization, JAK2 molecules associated with the GHR are activated through autophosphorylation and transphosphorylation. Activated JAKs then phosphorylate specific tyrosine residues on the intracellular domain of GHR, creating docking sites for downstream signaling proteins, particularly STATs.
STAT Recruitment and Phosphorylation
In simple terms: STAT proteins dock onto the receptor and get tagged with phosphate groups by JAK.
STAT proteins, primarily STAT5A and STAT5B, are recruited to the phosphorylated GHR via their SH2 domains. JAK kinases then phosphorylate STATs on conserved tyrosine residues, causing them to dissociate from the receptor.
STAT Dimerization and Nuclear Translocation
In simple terms: Tagged STATs pair up and move into the nucleus.
Phosphorylated STATs form dimers through reciprocal SH2-phosphotyrosine interactions. These dimers translocate to the nucleus, where they bind to specific DNA response elements in the promoters of target genes.
Target Gene Transcription and Feedback Regulation
In simple terms: STAT dimers turn genes on or off, and the pathway is later shut down by feedback inhibitors.
In the nucleus, STAT dimers modulate the expression of target genes involved in growth, metabolism, and immune function. Negative feedback is provided by suppressors of cytokine signaling (SOCS) proteins, which are induced by the pathway and inhibit JAK activity.
Key Genes Involved in GO:0060397 growth hormone receptor signaling pathway via JAK-STAT
The following genes and proteins are central to the growth hormone receptor signaling pathway via JAK-STAT (GO:0060397).
| Gene | Major Role | Research Relevance |
|---|---|---|
| GH1 | Encodes growth hormone, the ligand that initiates the pathway | Studied for its role in growth disorders and as a therapeutic agent |
| GHR | Growth hormone receptor; binds GH and activates JAK2 | Mutations cause Laron syndrome; target for cancer and longevity research |
| JAK2 | Janus kinase 2; phosphorylates GHR and STATs | Key mediator of cytokine signaling; mutations in myeloproliferative neoplasms |
| STAT5A | Signal transducer and activator of transcription 5A; transcription factor | Critical for growth, lactation, and immune function |
| STAT5B | Signal transducer and activator of transcription 5B; transcription factor | Mediates growth hormone effects on growth and metabolism |
| STAT1 | Signal transducer and activator of transcription 1; transcription factor | Modulates immune responses and growth hormone signaling |
| STAT3 | Signal transducer and activator of transcription 3; transcription factor | Involved in cell growth and survival; crosstalk with GHR signaling |
| SOCS1 | Suppressor of cytokine signaling 1; negative regulator | Feedback inhibitor of JAK-STAT; studied in inflammation |
| SOCS2 | Suppressor of cytokine signaling 2; negative regulator | Regulates growth hormone signaling and body size |
| SOCS3 | Suppressor of cytokine signaling 3; negative regulator | Inhibits JAK-STAT in metabolic and immune contexts |
| GATA2 | Transcription factor directly stimulated by growth hormone | Links GHR-JAK-STAT to hematopoietic and developmental gene programs |
| IGF1 | Insulin-like growth factor 1; downstream mediator of GH effects | Mediates growth-promoting effects of GHR-JAK-STAT |
| Lyn | Src-family kinase; modulates JAK-STAT signaling | Influences lifespan and cancer incidence in conjunction with STAT5 |
| PTPN1 | Protein tyrosine phosphatase 1B; negative regulator | Dephosphorylates JAK2 and GHR, attenuating signaling |
| CISH | Cytokine-inducible SH2-containing protein; negative regulator | Feedback inhibitor of STAT5 |
| PIAS1 | Protein inhibitor of activated STAT 1; negative regulator | Modulates STAT transcriptional activity |
| GHRH | Growth hormone-releasing hormone; upstream regulator | Controls GH secretion and indirectly pathway activity |
| Gα(q) | G protein alpha q subunit; controls organ size and developmental timing | Modulates growth signaling in Drosophila |
How Is growth hormone receptor signaling pathway via JAK-STAT Regulated?
The growth hormone receptor signaling pathway via JAK-STAT is tightly regulated at multiple levels. Negative feedback is mediated by SOCS proteins, which are induced by STAT activation and inhibit JAK kinase activity. Protein tyrosine phosphatases such as PTPN1 dephosphorylate JAK2 and GHR, terminating signaling. Additionally, PIAS proteins inhibit STAT DNA binding and transcriptional activity. Receptor internalization and degradation also control the duration and intensity of signaling. Crosstalk with other pathways, including the IGF1 axis, further modulates the pathway's output.
growth hormone receptor signaling pathway via JAK-STAT and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GHR | Laron syndrome, cancer, longevity | GHR knockout cell lines and mouse models |
| JAK2 | Myeloproliferative neoplasms, growth disorders | JAK2 point-mutation knock-in cell lines |
| STAT5B | Growth hormone insensitivity, immune dysregulation | STAT5B knockout and overexpression models |
| SOCS2 | Gigantism, metabolic disorders | SOCS2 knockout models |
| GATA2 | Hematopoietic disorders, developmental defects | GATA2 reporter knock-in cell lines |
Cancer and Chronic Diseases
Dysregulation of GHR-JAK-STAT signaling is implicated in cancer and chronic diseases. Growth hormone receptor regulation is altered in various malignancies, and sustained STAT5 activation promotes cell proliferation and survival. In chronic diseases such as alcohol-associated liver disease, stress-immune-growth interactions involving JAK-STAT contribute to pathogenesis. Understanding these mechanisms is critical for developing targeted therapies.
Lifespan and Aging
The GHR-JAK-STAT5 pathway influences lifespan and cancer incidence. Studies in animal models show that reduced GHR signaling extends lifespan and lowers cancer risk, with Lyn kinase playing a modulatory role. These findings highlight the pathway as a target for aging research.
Growth Disorders and Osteogenic Differentiation
Mutations in GHR or JAK2 cause growth disorders such as Laron syndrome. Additionally, GHR-JAK-STAT/IGF1 signaling promotes osteogenic differentiation of ectomesenchyme stem cells, linking the pathway to bone formation and regenerative medicine.
From growth hormone receptor signaling pathway via JAK-STAT-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does GHR loss affect STAT5 activation and target gene expression? | GHR knockout cell line |
| How does a specific JAK2 mutation alter kinase activity? | JAK2 point-mutation knock-in cell line |
| Can a tagged STAT5B reveal nuclear translocation dynamics? | STAT5B knock-in with fluorescent tag |
| Does overexpression of SOCS2 suppress GHR-JAK-STAT signaling? | SOCS2 overexpression cell line |
| What is the role of GATA2 in GH-induced transcription? | GATA2 knockout and reporter knock-in |
| Does Lyn kinase modulate lifespan via JAK-STAT? | Lyn knockout and overexpression models |
How to Study the growth hormone receptor signaling pathway via JAK-STAT Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identifying STAT target genes |
| Phosphoproteomics | Phosphorylation of signaling proteins | Mapping JAK-STAT activation dynamics |
| Live-cell imaging | STAT nuclear translocation | Studying pathway kinetics |
| CRISPR knockout screen | Gene essentiality and pathway modifiers | Discovering novel regulators |
| ChIP-seq | STAT DNA binding sites | Defining direct transcriptional targets |
| Western blot | Protein expression and phosphorylation | Validating pathway activation |
| Reporter assays | Transcriptional activity of STATs | Screening for pathway modulators |
| Co-immunoprecipitation | Protein-protein interactions | Detecting GHR-JAK-STAT complexes |
Transcriptomic Analysis (RNA-seq)
RNA sequencing can identify global changes in gene expression following activation or perturbation of GHR-JAK-STAT signaling. This method is useful for defining target gene networks and validating STAT-dependent transcription.
Proteomic and Phosphoproteomic Profiling
Mass spectrometry-based proteomics can quantify phosphorylation events on GHR, JAK2, and STATs, providing a dynamic view of pathway activation. This approach helps identify novel regulators and feedback mechanisms.
Imaging of STAT Nuclear Translocation
Fluorescence microscopy with GFP-tagged STAT proteins allows real-time visualization of dimerization and nuclear translocation in live cells. This method is valuable for studying kinetics and spatial regulation.
CRISPR Screening and Functional Genomics
Genome-wide CRISPR knockout screens can identify genes that modulate GHR-JAK-STAT signaling, revealing novel components and crosstalk. These screens are powerful for unbiased discovery of pathway regulators.
How CRISPR Can Be Used to Study GO:0060397 growth hormone receptor signaling pathway via JAK-STAT
Knockout
CRISPR knockout of GHR, JAK2, or STAT genes abolishes pathway activity, enabling researchers to study loss-of-function phenotypes such as impaired growth or altered gene expression. Knockout cell lines are essential for validating causal roles in disease models.
Point Mutation
Introducing specific point mutations in JAK2 or STAT5B via CRISPR can mimic disease-associated variants or disrupt phosphorylation sites, allowing precise dissection of signaling mechanisms. These models are valuable for drug resistance studies.
Knock-in
Knock-in of tagged versions of GHR or STAT proteins (e.g., GFP or luciferase) enables real-time tracking of localization and interaction dynamics. Knock-in of reporter genes under STAT-responsive promoters allows sensitive readout of pathway activity.
Overexpression
CRISPR activation or cDNA overexpression of SOCS proteins or constitutively active STATs can amplify or suppress the pathway, helping to identify dosage-sensitive effects and feedback loops. Overexpression models are useful for screening pathway inhibitors.
How EDITGENE Supports growth hormone receptor signaling pathway via JAK-STAT Research
Researchers studying growth hormone receptor signaling pathway via JAK-STAT-related genes often need to determine whether a candidate gene is causally involved in pathway regulation or disease. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for growth hormone receptor signaling pathway via JAK-STAT research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| STAT6 Knockout HEK293 Cell Line | EDJ-KQ248 | Human | 6778 | Details Get a Quote |
| STAT5A Knockout HEK293 Cell Line | EDJ-KQ538 | Human | 6776 | Details Get a Quote |
| STAT5B Knockout HEK293 Cell Line | EDJ-KQ539 | Human | 6777 | Details Get a Quote |
| LYN Knockout HEK293 Cell Line | EDJ-KQ574 | Human | 4067 | Details Get a Quote |
| STAT3 Knockout HEK293 Cell Line | EDJ-KQ903 | Human | 6774 | Details Get a Quote |
| PTPN1 Knockout HEK293 Cell Line | EDJ-KQ2304 | Human | 5770 | Details Get a Quote |
| JAK1 Knockout HEK293 Cell Line | EDJ-KQ17827 | Human | 3716 | Details Get a Quote |
| JAK2 Knockout HEK293 Cell Line | EDJ-KQ17828 | Human | 3717 | Details Get a Quote |
| JAK3 Knockout HEK293 Cell Line | EDJ-KQ17829 | Human | 3718 | Details Get a Quote |
| TYK2 Knockout HEK293 Cell Line | EDJ-KQ17914 | Human | 7297 | Details Get a Quote |
| JAK3 Knockout HCT 116 Cell Line | EDJ-KQ18011 | Human | 3718 | Details Get a Quote |
| STAT6 Knockout HeLa Cell Line | EDJ-KQ18024 | Human | 6778 | Details Get a Quote |
| LYN Knockout HeLa Cell Line | EDJ-KQ18031 | Human | 4067 | Details Get a Quote |
| STAT3 Knockout HeLa Cell Line | EDJ-KQ18072 | Human | 6774 | Details Get a Quote |
| TYK2 Knockout A-549 Cell Line | EDJ-KQ18137 | Human | 7297 | Details Get a Quote |
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Frequently Asked Questions About growth hormone receptor signaling pathway via JAK-STAT
What is GO:0060397?
GO:0060397 is the Gene Ontology term for growth hormone receptor signaling pathway via JAK-STAT, describing how growth hormone binding to GHR activates JAK kinases and STAT transcription factors to modulate gene expression.
What genes are involved in growth hormone receptor signaling pathway via JAK-STAT?
Key genes include GH1, GHR, JAK2, STAT5A, STAT5B, SOCS1, SOCS2, and GATA2, among others.
How does growth hormone activate JAK-STAT signaling?
Growth hormone binds to GHR, causing receptor dimerization and JAK2 activation, which then phosphorylates STAT proteins that dimerize and translocate to the nucleus.
What diseases are associated with GHR-JAK-STAT signaling?
Dysregulation is linked to cancer, chronic liver disease, growth disorders, and altered lifespan.
What are the negative regulators of GHR-JAK-STAT signaling?
SOCS proteins, PTPN1, and PIAS proteins provide negative feedback to attenuate the pathway.
How can I study GHR-JAK-STAT signaling in the lab?
Common methods include RNA-seq, phosphoproteomics, live-cell imaging, and CRISPR screens.
What is the role of STAT5 in growth hormone signaling?
STAT5A and STAT5B are the primary STATs activated by GHR-JAK2, mediating growth, metabolism, and immune effects.
Can CRISPR be used to model GHR-JAK-STAT pathway mutations?
Yes, CRISPR knockout, point mutation, and knock-in models are widely used to study pathway components and disease variants.
What is the relationship between GHR-JAK-STAT and lifespan?
Reduced GHR-JAK-STAT5 signaling is associated with extended lifespan and lower cancer incidence in animal models.
How does GATA2 relate to growth hormone signaling?
Growth hormone directly stimulates GATA2 expression, linking GHR-JAK-STAT to hematopoietic and developmental gene programs.
Conclusion
GO:0060397, growth hormone receptor signaling pathway via JAK-STAT, is a central mechanism for translating endocrine growth signals into transcriptional programs. Its components are critical for growth, metabolism, immunity, and lifespan, and their dysregulation underlies various diseases. Continued research using CRISPR models and multi-omics approaches will further elucidate its roles and therapeutic potential.
References
- 1. Osna NA et al.. 2022. Pathogenesis of Alcohol-Associated Liver Disease.. J Clin Exp Hepatol 12(6):1492-1513 PMID: 36340300
- 2. Mitsutani M et al.. 2024. Growth hormone directly stimulates GATA2 expression.. Growth Horm IGF Res 74:101572 PMID: 38281404
- 3. Wang K et al.. 2026. LNGFR promoting osteogenic differentiation of ectomesenchyme stem cells via activation of GHR-JAK-STAT/IGF1 signaling pathway.. Stem Cell Res Ther 17(1) PMID: 42106838
- 4. Strous GJ et al.. 2020. Growth Hormone Receptor Regulation in Cancer and Chronic Diseases.. Front Endocrinol (Lausanne) 11:597573 PMID: 33312162
- 5. Chhabra Y et al.. 2024. Roles of Growth Hormone-Dependent JAK-STAT5 and Lyn Kinase Signaling in Determining Lifespan and Cancer Incidence.. Endocrinology 165(11) PMID: 39378329
- 6. Chhabra Y et al.. 2021. GHR signalling: Receptor activation and degradation mechanisms.. Mol Cell Endocrinol 520:111075 PMID: 33181235
- 7. Philip AM et al.. 2015. Stress-Immune-Growth Interactions: Cortisol Modulates Suppressors of Cytokine Signaling and JAK/STAT Pathway in Rainbow Trout Liver.. PLoS One 10(6):e0129299 PMID: 26083490
- 8. Unger MF et al.. 2025. Gα(q) controls organ size and developmental timing in Drosophila.. Cell Commun Signal 23(1):457 PMID: 41131630
