GO:0033210 leptin-mediated signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0033210 (leptin-mediated signaling pathway) describes the biological process through which the adipokine leptin binds its receptor and triggers intracellular signaling cascades that control energy balance, neuroendocrine function, immune activity, and cell growth.
• Leptin signaling classically activates JAK2/STAT3, but also engages MAPK/ERK, PI3K/AKT, AMPKα, and RhoA/ROCK branches depending on cell type and context.
• The pathway is highly relevant to obesity, insulin resistance, cartilage and bone biology, breast cancer progression, and acquired aplastic anemia.
• Experimental disruption of leptin-mediated signaling can be modeled with CRISPR knockout, point mutation, knock-in, and overexpression cell and animal models.
• Key research methods include phospho-STAT3/ERK immunoblotting, luciferase reporter assays, transcriptomics, and functional assays in leptin-responsive cells.
• EDITGENE provides CRISPR cell model services covering knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics for leptin pathway research.
Description
GO:0033210, the leptin-mediated signaling pathway, is a biological process that begins when the hormone leptin binds to its receptor and initiates intracellular signal transduction. Leptin is primarily secreted by adipose tissue and acts as a key regulator of energy homeostasis, but its signaling also influences neuroendocrine function, immune responses, bone and cartilage metabolism, and cancer cell behavior. Because leptin-mediated signaling integrates multiple downstream cascades, it is a central node for researchers studying metabolic disease, inflammation, and tumor biology.
leptin-mediated signaling pathway At A Glance
| GO ID | GO:0033210 |
|---|---|
| GO term | leptin-mediated signaling pathway |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Transduces leptin receptor activation into intracellular signaling that regulates energy balance, neuroendocrine function, immune activity, and cell growth |
| Key upstream ligand | Leptin (LEP) |
| Key receptor | Leptin receptor (LEPR) |
| Major downstream cascades | JAK/STAT3, MAPK/ERK, PI3K/AKT, AMPKα, RhoA/ROCK |
| Representative cell types | Hypothalamic neurons, chondrocytes, adipocytes, breast cancer cells, bone marrow cells |
What Is GO:0033210?
The leptin-mediated signaling pathway (GO:0033210) is the series of molecular events triggered when leptin binds to the leptin receptor, leading to activation of intracellular signaling cascades such as JAK/STAT, MAPK/ERK, PI3K/AKT, and AMPKα-dependent pathways, and ultimately producing changes in gene expression, cell metabolism, cytoskeletal organization, and cell behavior.
Why Is leptin-mediated signaling pathway Important in Cell Biology?
Leptin-mediated signaling is important because it connects nutritional status to diverse physiological outputs, including appetite control, thermogenesis, insulin sensitivity, cartilage maintenance, immune cell regulation, and cancer progression. Dysregulation of this pathway is implicated in obesity-related metabolic dysfunction, insulin resistance, inflammatory bone marrow disorders, and tumor growth, making it a high-value target for mechanistic and translational research.
• Regulates energy homeostasis and thermogenesis through leptin-mediated AMPKα/STAT3 signaling.
• Controls neuronal signaling and transcription, and is disrupted by cellular insulin resistance.
• Modulates collagen II expression in cartilage via the leptin-mediated MAPK/ERK pathway.
• Promotes cytoskeletal remodeling in chondrocytes through RhoA/ROCK signaling.
• Supports breast cancer cell viability and migration by suppressing CCN5 via JAK/AKT/STAT activation.
• Contributes to proinflammatory bone marrow environments in acquired aplastic anemia.
• Is involved in lung epithelial cell transformation under environmental exposure via ERK signaling.
• Can be modulated by natural compounds such as Panax notoginseng saponins and thymoquinone.
• Provides a mechanistic link between obesity, inflammation, and cancer.
• Offers multiple druggable nodes (LEPR, JAK2, STAT3, ERK, AKT, AMPKα) for experimental intervention.
What Happens During leptin-mediated signaling pathway?
Leptin binding and receptor activation
In simple terms: Leptin acts like a key that fits the leptin receptor on the cell surface, starting a chain of signals inside the cell.
The pathway begins when leptin binds to the leptin receptor (LEPR), triggering receptor activation and recruitment of intracellular signaling molecules. This initial event is required for downstream activation of JAK/STAT, MAPK/ERK, and other cascades in leptin-responsive cells.
JAK/STAT3 activation
In simple terms: The receptor turns on JAK kinases, which then activate STAT3 to change gene expression.
Leptin-mediated signaling classically activates JAK2 and STAT3, leading to STAT3 phosphorylation, dimerization, and nuclear translocation where it regulates target gene transcription. This branch is central to leptin control of neuronal signaling and transcription, and is disrupted under cellular insulin resistance.
MAPK/ERK signaling branch
In simple terms: A second branch of the pathway uses ERK proteins to control cell growth and matrix gene expression.
Leptin also activates the MAPK/ERK cascade, which regulates collagen II expression in cartilage and promotes transformation of alveolar type II epithelial cells under environmental exposure. This branch is distinct from STAT3 activation and can be studied with phospho-ERK immunoblotting.
PI3K/AKT and AMPKα branches
In simple terms: Other signaling arms help leptin control metabolism and cell survival.
Leptin-mediated signaling can activate PI3K/AKT and AMPKα pathways, which contribute to cell viability, migration, thermogenesis, and beige adipocyte reconstruction. In breast cancer cells, leptin-induced JAK/AKT/STAT activation suppresses CCN5 signaling to promote viability and migration.
Cytoskeletal remodeling and RhoA/ROCK
In simple terms: Leptin can also rearrange the cell's internal skeleton through RhoA/ROCK signaling.
In chondrocytes, leptin-mediated signaling induces cytoskeletal remodeling via the RhoA/ROCK pathway, linking leptin to cell shape and mechanical properties. This branch expands the functional repertoire of leptin signaling beyond transcriptional control.
Key Genes Involved in GO:0033210 leptin-mediated signaling pathway
The following genes and proteins are central to leptin-mediated signaling pathway research, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| LEP | Encodes leptin, the ligand that initiates the pathway | Upstream trigger of GO:0033210; measured in obesity and metabolic studies |
| LEPR | Leptin receptor that binds leptin and activates downstream signaling | Core receptor for pathway activation; target for knockout and knock-in models |
| JAK2 | Janus kinase that phosphorylates STAT3 upon leptin receptor activation | Key kinase in the JAK/STAT branch; studied by phospho-JAK2 immunoblotting |
| STAT3 | Transcription factor activated by JAK2; regulates target gene expression | Central node in leptin-mediated transcription; measured by phospho-STAT3 |
| MAPK1/ERK2 | Kinase in the MAPK/ERK cascade activated by leptin | Regulates collagen II and cell transformation; studied by phospho-ERK |
| MAPK3/ERK1 | Kinase in the MAPK/ERK cascade activated by leptin | Cooperates with ERK2 in leptin-mediated ERK signaling |
| AKT1 | Serine/threonine kinase in the PI3K/AKT branch | Promotes cell viability and migration in leptin-stimulated cancer cells |
| PIK3CA | Catalytic subunit of PI3K upstream of AKT | Contributes to leptin-mediated PI3K/AKT signaling |
| PRKAA1/AMPKα | Energy sensor kinase activated in leptin-mediated thermogenesis | Mediates leptin effects on beige adipocyte reconstruction |
| RHOA | Small GTPase that activates ROCK | Mediates leptin-induced cytoskeletal remodeling in chondrocytes |
| ROCK1 | Effector kinase downstream of RhoA | Required for leptin-mediated cytoskeletal changes |
| CCN5 | Secreted protein suppressed by leptin signaling in breast cancer | Links leptin to cancer cell viability and migration |
| COL2A1 | Collagen II gene regulated by leptin-mediated ERK signaling | Readout of leptin effects in cartilage |
| IL6 | Proinflammatory cytokine associated with leptin-mediated bone marrow inflammation | Marker of leptin-driven inflammatory environment |
| TNF | Proinflammatory cytokine linked to leptin signaling in inflammation | Studied in aplastic anemia and metabolic inflammation |
| SOCS3 | Negative regulator of leptin receptor signaling | Feedback inhibitor of JAK/STAT branch; relevant for pathway tuning |
| PTP1B | Protein tyrosine phosphatase that attenuates leptin receptor signaling | Negative regulator studied in leptin resistance |
How Is leptin-mediated signaling pathway Regulated?
Leptin-mediated signaling is regulated by negative feedback mechanisms, including SOCS3 and PTP1B, which attenuate JAK/STAT activation. Cellular insulin resistance can disrupt leptin-mediated control of neuronal signaling and transcription, indicating cross-talk with insulin signaling. Natural compounds such as Panax notoginseng saponins and thymoquinone can modulate leptin-mediated pathways in obesity and brain tissue, respectively.
leptin-mediated signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| LEPR | Obesity and metabolic dysfunction | Leptin receptor knockout or point-mutation cell lines |
| STAT3 | Breast cancer viability and migration | STAT3 knockout or knock-in reporter in breast cancer cells |
| MAPK1/ERK2 | Cartilage collagen II regulation and epithelial transformation | ERK2 knockout chondrocytes or epithelial cells |
| RHOA/ROCK1 | Chondrocyte cytoskeletal remodeling | RhoA or ROCK1 knockout chondrocytes |
| IL6/TNF | Acquired aplastic anemia and bone marrow inflammation | Leptin-stimulated bone marrow stromal cell models |
Leptin signaling in obesity and metabolic disease
Leptin-mediated AMPKα/STAT3 signaling promotes thermogenesis and beige adipocyte reconstruction in diet-induced obesity, and Panax notoginseng saponins modulate gut microbiota to enhance this pathway. Cellular insulin resistance disrupts leptin-mediated control of neuronal signaling and transcription, linking leptin resistance to metabolic dysfunction.
Leptin signaling in cancer
Leptin-induced ER-α-positive breast cancer cell viability and migration is mediated by suppressing CCN5 signaling via activating JAK/AKT/STAT pathways. Leptin-mediated ERK signaling also promotes transformation of rat alveolar type II epithelial cells induced by Yunnan tin mine dust, suggesting a role in environmental carcinogenesis.
Leptin signaling in cartilage and bone disorders
Leptin-mediated MAPK/ERK signaling affects collagen II expression in knee cartilage of newborn male mice from obese maternal offspring, implicating leptin in developmental cartilage biology. Leptin-mediated cytoskeletal remodeling in chondrocytes occurs via the RhoA/ROCK pathway, linking leptin to cartilage cell mechanics. Leptin also contributes to a proinflammatory bone marrow environment in acquired aplastic anemia.
Leptin signaling in brain and sleep
Thymoquinone mitigates the effects of sleep restriction on leptin-mediated signaling in rat brain, suggesting that leptin pathways are sensitive to sleep and pharmacological modulation.
From leptin-mediated signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does LEPR mediate leptin-induced STAT3 activation? | LEPR knockout cell line |
| Does a specific LEPR mutation alter JAK2 binding? | LEPR point-mutation knock-in |
| Can leptin-mediated ERK signaling be tracked in live cells? | ERK1/2 tagged knock-in reporter |
| Does overexpression of leptin drive breast cancer migration? | Leptin overexpression in ER-α-positive breast cancer cells |
| Is AMPKα required for leptin-induced thermogenesis? | AMPKα knockout adipocyte model |
| Does RhoA/ROCK mediate leptin-induced cytoskeletal changes? | RhoA or ROCK1 knockout chondrocytes |
How to Study the leptin-mediated signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Phospho-STAT3 immunoblot | JAK/STAT3 activation | Leptin-stimulated neuronal or cancer cells |
| Phospho-ERK immunoblot | MAPK/ERK activation | Cartilage and epithelial transformation studies |
| Phospho-AKT immunoblot | PI3K/AKT activation | Breast cancer viability and migration |
| Phospho-AMPKα immunoblot | AMPKα activation | Thermogenesis and beige adipocyte studies |
| Luciferase reporter assay | STAT3 transcriptional activity | Leptin-mediated gene expression |
| qPCR | Target gene expression (SOCS3, CCN5, COL2A1) | Pathway output validation |
| Migration assay | Cell migration capacity | Leptin-induced cancer cell migration |
| Cytoskeletal imaging | RhoA/ROCK-dependent remodeling | Chondrocyte cytoskeleton studies |
Phospho-protein immunoblotting
Phospho-STAT3, phospho-ERK, phospho-AKT, and phospho-AMPKα immunoblotting are standard methods to measure activation of leptin-mediated signaling branches after leptin stimulation.
Transcriptional reporter assays
STAT3-driven luciferase reporters and target gene qPCR (e.g., SOCS3, CCN5, COL2A1) are used to assess leptin-mediated transcriptional output.
Functional cell assays
Cell viability, migration, and differentiation assays in leptin-stimulated cells reveal the biological consequences of pathway activation in cancer, cartilage, and immune models.
In vivo and ex vivo models
Diet-induced obesity models, obese maternal offspring cartilage, and sleep-restricted rat brain models are used to study leptin-mediated signaling in physiological and pathological contexts.
How CRISPR Can Be Used to Study GO:0033210 leptin-mediated signaling pathway
Knockout
CRISPR knockout of LEPR, JAK2, STAT3, MAPK1/3, AKT1, or RHOA can abolish specific branches of leptin-mediated signaling, enabling causal assignment of pathway components to downstream phenotypes such as STAT3 activation, ERK phosphorylation, or cytoskeletal remodeling.
Point Mutation
Point mutations in LEPR or JAK2 can be introduced to test whether specific residues are required for leptin-induced signaling, mimicking naturally occurring variants or phospho-site mutants.
Knock-in
Knock-in of tagged STAT3, ERK, or AKT allows live-cell tracking of leptin-mediated signaling dynamics and subcellular localization in response to leptin.
Overexpression
Overexpression of leptin, LEPR, or constitutively active STAT3/AKT can amplify leptin-mediated signaling to study gain-of-function effects in cancer, cartilage, and metabolic cells.
How EDITGENE Supports leptin-mediated signaling pathway Research
Researchers studying leptin-mediated signaling pathway-related genes often need to determine whether a candidate gene is causally involved in leptin responses, which requires precise genetic models that can isolate individual pathway branches.
Contact EDITGENE today to design your custom CRISPR model for leptin-mediated signaling pathway research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| LEP Knockout HEK293 Cell Line | EDJ-KQ506 | Human | 3952 | Details Get a Quote |
| LEPR Knockout HEK293 Cell Line | EDJ-KQ507 | Human | 3953 | Details Get a Quote |
| STAT3 Knockout HEK293 Cell Line | EDJ-KQ903 | Human | 6774 | Details Get a Quote |
| SIRT1 Knockout HEK293 Cell Line | EDJ-KQ1128 | Human | 23411 | Details Get a Quote |
| ADIPOR1 Knockout HEK293 Cell Line | EDJ-KQ1860 | Human | 51094 | Details Get a Quote |
| UGCG Knockout HEK293 Cell Line | EDJ-KQ2506 | Human | 7357 | Details Get a Quote |
| STAT3 Knockout HeLa Cell Line | EDJ-KQ18072 | Human | 6774 | Details Get a Quote |
| STAT3 Knockout A-549 Cell Line | EDJ-KQ21087 | Human | 6774 | Details Get a Quote |
| STAT3 Knockout HCT 116 Cell Line | EDJ-KQ21089 | Human | 6774 | Details Get a Quote |
| UGCG Knockout A-549 Cell Line | EDJ-KQ23102 | Human | 7357 | Details Get a Quote |
| UGCG Knockout HCT 116 Cell Line | EDJ-KQ23103 | Human | 7357 | Details Get a Quote |
| UGCG Knockout HeLa Cell Line | EDJ-KQ23104 | Human | 7357 | Details Get a Quote |
| LEPR Knockout A-549 Cell Line | EDJ-KQ18828 | Human | 3953 | Details Get a Quote |
| LEPR Knockout HCT 116 Cell Line | EDJ-KQ18829 | Human | 3953 | Details Get a Quote |
| LEPR Knockout HeLa Cell Line | EDJ-KQ18830 | Human | 3953 | Details Get a Quote |
Frequently Asked Questions About leptin-mediated signaling pathway
What is GO:0033210 leptin-mediated signaling pathway?
GO:0033210 is the biological process by which leptin binding to its receptor triggers intracellular signaling cascades such as JAK/STAT, MAPK/ERK, PI3K/AKT, and AMPKα to regulate energy balance, transcription, and cell behavior.
What genes are involved in leptin-mediated signaling pathway?
Key genes include LEP, LEPR, JAK2, STAT3, MAPK1/3, AKT1, PIK3CA, PRKAA1, RHOA, ROCK1, CCN5, and COL2A1.
How is leptin-mediated signaling pathway activated?
It is activated when leptin binds the leptin receptor, leading to JAK2 activation, STAT3 phosphorylation, and engagement of MAPK/ERK, PI3K/AKT, and AMPKα branches.
What diseases are linked to leptin-mediated signaling pathway?
It is linked to obesity, insulin resistance, breast cancer, cartilage disorders, acquired aplastic anemia, and sleep-related brain changes.
How can I study leptin-mediated signaling in the lab?
Common methods include phospho-STAT3/ERK/AKT immunoblotting, luciferase reporter assays, qPCR of target genes, migration assays, and cytoskeletal imaging.
What is the role of STAT3 in leptin-mediated signaling?
STAT3 is a transcription factor activated downstream of JAK2 that mediates leptin control of neuronal signaling and transcription, and is disrupted by insulin resistance.
Does leptin signaling affect cartilage?
Yes, leptin-mediated MAPK/ERK signaling affects collagen II expression in knee cartilage, and leptin induces cytoskeletal remodeling in chondrocytes via RhoA/ROCK.
Can CRISPR be used to study leptin-mediated signaling?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can isolate specific pathway branches and test causal roles of LEPR, JAK2, STAT3, ERK, AKT, and RHOA.
What is the relationship between leptin signaling and breast cancer?
Leptin-induced ER-α-positive breast cancer cell viability and migration is mediated by suppressing CCN5 signaling via activating JAK/AKT/STAT pathways.
How does sleep affect leptin-mediated signaling?
Thymoquinone mitigates the effects of sleep restriction on leptin-mediated signaling in rat brain, indicating that sleep and pharmacological agents can modulate this pathway.
Conclusion
GO:0033210 leptin-mediated signaling pathway is a central biological process that translates leptin receptor activation into diverse cellular outcomes through JAK/STAT, MAPK/ERK, PI3K/AKT, AMPKα, and RhoA/ROCK branches. Its dysregulation is implicated in obesity, insulin resistance, cancer, cartilage disorders, and bone marrow inflammation, making it a high-priority research area. Precise CRISPR models and multi-omics methods are essential to dissect the causal contributions of individual pathway components.
References
- 1. Hu X et al.. 2023. [Leptin-mediated ERK Signaling Pathway Promotes the Transformation PMID: 37989336
- 2. Xu Y et al.. 2020. Panax notoginseng saponins modulate the gut microbiota to promote thermogenesis and beige adipocyte reconstruction via leptin-mediated AMPKα/STAT3 signaling in diet-induced obesity.. Theranostics 10(24):11302-11323 PMID: 33042284
- 3. Wang W et al.. 2022. Effects of the Leptin-Mediated MAPK/ERK Signaling Pathway on Collagen II Expression in Knee Cartilage of Newborn Male Mice from Obese Maternal Offspring.. Biomolecules 12(3) PMID: 35327669
- 4. Nazarians-Armavil A et al.. 2013. Cellular insulin resistance disrupts leptin-mediated control of neuronal signaling and transcription.. Mol Endocrinol 27(6):990-1003 PMID: 23579487
- 5. Liang J et al.. 2011. Leptin-mediated cytoskeletal remodeling in chondrocytes occurs via the RhoA/ROCK pathway.. J Orthop Res 29(3):369-74 PMID: 20886658
- 6. Haque I et al.. 2018. Leptin-induced ER-α-positive breast cancer cell viability and migration is mediated by suppressing CCN5-signaling via activating JAK/AKT/STAT-pathway.. BMC Cancer 18(1):99 PMID: 29370782
- 7. Gao M et al.. 2022. Leptin-mediated proinflammatory bone marrow environment in acquired aplastic anemia.. Cytokine 152:155829 PMID: 35217430
- 8. Manoharan N et al.. 2024. Role of Thymoquinone on sleep restriction and its mitigating effect on leptin-mediated signaling pathway in rat brain.. Mol Biol Rep 51(1):769 PMID: 38886257
