GO:0060175 brain-derived neurotrophic factor receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060175 describes the molecular function of combining with brain-derived neurotrophic factor (BDNF) and transmitting the signal across the plasma membrane to initiate a change in cell activity.
• The principal receptor mediating this activity is the tropomyosin-related kinase B (TrkB, encoded by NTRK2), a receptor tyrosine kinase that is activated by BDNF binding.
• BDNF-TrkB signaling controls neuronal excitability, synaptic plasticity, long-term depression, and fear conditioning, as demonstrated in multiple brain regions.
• Dysregulation of BDNF receptor activity is implicated in cancer, multiple sclerosis, and impaired post-stroke recovery.
• Astrocyte BDNF-TrkB signaling is not universally required for long-term potentiation, indicating cell-type-specific roles.
• BDNF can also modulate GABA(A) receptor-mediated responses via postsynaptic mechanisms, showing crosstalk with inhibitory neurotransmission.
Description
GO:0060175, brain-derived neurotrophic factor receptor activity, is a molecular function term that defines the ability of a receptor to bind brain-derived neurotrophic factor (BDNF) and transmit a signal across the plasma membrane to initiate a change in cell activity. This activity is essential for neuronal development, synaptic plasticity, and higher-order brain functions. The canonical receptor for BDNF is tropomyosin-related kinase B (TrkB), a receptor tyrosine kinase encoded by the NTRK2 gene. BDNF binding to TrkB triggers autophosphorylation and downstream signaling cascades that regulate cell survival, differentiation, and synaptic strength. Researchers study GO:0060175 to understand how BDNF-TrkB signaling contributes to normal brain function and to disease states. For example, BDNF-TrkB signaling in the oval nucleus of the bed nucleus of the stria terminalis controls excitability and long-term depression. In the amygdala, this signaling is involved in fear conditioning. Dysregulation of BDNF receptor activity has been linked to cancer progression, multiple sclerosis, and recovery after stroke. Because BDNF receptor activity is a central node in neurotrophin signaling, it is a target for experimental manipulation using CRISPR-based gene editing, pharmacological tools, and advanced sequencing methods. Understanding its molecular mechanism, key genes, and regulatory context is critical for both basic neuroscience and translational research.
brain-derived neurotrophic factor receptor activity At A Glance
| GO ID | GO:0060175 |
|---|---|
| GO term | brain-derived neurotrophic factor receptor activity |
| Ontology | molecular_function |
| Synonym | BDNF-activated receptor activity, BDNF receptor activity, brain-derived neurotrophic factor-activated receptor activity |
| Major function | Binding BDNF and transmitting a signal across the plasma membrane to initiate cellular changes |
| Primary receptor | TrkB (NTRK2), a receptor tyrosine kinase |
| Downstream effects | Regulation of neuronal excitability, synaptic plasticity, and long-term depression |
| Disease relevance | Cancer, multiple sclerosis, stroke recovery, and fear-related disorders |
What Is GO:0060175?
In simple terms, GO:0060175 describes what happens when a receptor on the cell surface binds to BDNF and sends a signal into the cell. According to the QuickGO definition, this activity involves combining with a brain-derived neurotrophic factor and transmitting the signal across the plasma membrane to initiate a change in cell activity. This is a molecular function, meaning it is the specific job performed by a receptor protein, most notably the TrkB receptor, when it interacts with BDNF.
Why Is brain-derived neurotrophic factor receptor activity Important in Cell Biology?
GO:0060175 is critically important because BDNF-TrkB signaling governs fundamental processes in the nervous system, including neuronal survival, synaptic plasticity, and learning and memory. Disruption of this activity is associated with a wide range of pathological conditions, from neurodegenerative and autoimmune diseases to cancer. Understanding the precise molecular details of BDNF receptor activity enables researchers to design targeted interventions and to interpret how genetic variants or expression changes affect brain function and disease progression.
• Controls neuronal excitability and long-term depression in the bed nucleus of the stria terminalis.
• Is required for amygdala-dependent fear conditioning.
• Mediates activity-dependent release of BDNF after stroke, influencing recovery.
• Is implicated in the pathogenesis of multiple sclerosis and experimental autoimmune encephalomyelitis.
• Plays a role in cancer biology through TrkB receptor signaling.
• Can modulate GABA(A) receptor-mediated responses in cerebellar granule cells.
• Exercise promotes BDNF expression via β-hydroxybutyrate, indirectly affecting receptor activity.
• Astrocyte BDNF-TrkB signaling is not required for long-term potentiation in the perirhinal cortex, highlighting cell-type specificity.
• Serves as a target for therapeutic strategies in neurological and psychiatric disorders.
• Provides a model system for studying receptor tyrosine kinase signaling mechanisms.
What Happens During brain-derived neurotrophic factor receptor activity?
BDNF Binding and Receptor Dimerization
In simple terms: BDNF attaches to the TrkB receptor, causing two receptor molecules to pair up.
The first step in BDNF receptor activity is the binding of BDNF to the extracellular domain of TrkB. This binding induces dimerization and autophosphorylation of the receptor's intracellular kinase domain. This event is the molecular basis for transmitting the signal across the plasma membrane, as defined by GO:0060175.
Intracellular Signaling Cascade Activation
In simple terms: Once activated, the receptor turns on a series of signaling proteins inside the cell.
Phosphorylated TrkB recruits and activates downstream effectors such as the MAPK/ERK, PI3K/Akt, and PLCγ pathways. These cascades lead to changes in gene expression, ion channel function, and cytoskeletal dynamics. In the oval nucleus of the BNST, this signaling controls excitability and long-term depression.
Modulation of Synaptic Plasticity and Excitability
In simple terms: The signal changes how neurons communicate with each other.
BDNF-TrkB signaling modulates synaptic strength and neuronal excitability. For example, in the amygdala, this pathway is involved in fear conditioning. In cerebellar granule cells, BDNF attenuates GABA(A) receptor-mediated responses via postsynaptic mechanisms. These effects demonstrate the functional output of BDNF receptor activity.
Activity-Dependent Release and Feedback
In simple terms: Neuronal activity can trigger more BDNF release, creating a feedback loop.
Activity-dependent release of BDNF is a key feature of this system. After stroke, increased neuronal activity leads to BDNF release, which then acts on TrkB to promote recovery. Exercise also promotes BDNF expression through the action of the ketone body β-hydroxybutyrate, indirectly enhancing receptor activity.
Key Genes Involved in GO:0060175 brain-derived neurotrophic factor receptor activity
The following genes and proteins are central to brain-derived neurotrophic factor receptor activity and its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| BDNF | Ligand that binds and activates the receptor | Central to neurotrophin signaling; expression regulated by exercise |
| NTRK2 (TrkB) | Receptor tyrosine kinase that mediates BDNF signaling | Primary receptor for GO:0060175; implicated in cancer and neurological disorders |
| NTRK1 (TrkA) | Related neurotrophin receptor | Can crosstalk with TrkB signaling pathways |
| NTRK3 (TrkC) | Related neurotrophin receptor | Part of the neurotrophin receptor family |
| GABAAR subunits | Inhibitory neurotransmitter receptors modulated by BDNF | BDNF attenuates GABA(A) responses in cerebellar granule cells |
| MAPK1/ERK2 | Downstream kinase in BDNF signaling | Mediates plasticity and gene expression changes |
| AKT1 | Downstream kinase in PI3K pathway | Promotes cell survival and growth |
| PLCG1 | Phospholipase C gamma 1 | Mediates calcium signaling downstream of TrkB |
| CREB1 | Transcription factor activated by BDNF signaling | Regulates genes involved in plasticity and survival |
| ARC | Activity-regulated cytoskeleton-associated protein | Immediate early gene induced by BDNF-TrkB signaling |
| SLC1A2 (EAAT2) | Glutamate transporter | Modulated by BDNF signaling in astrocytes |
| GRIN2A (NR2A) | NMDA receptor subunit | Interacts with BDNF signaling in synaptic plasticity |
| GRIN2B (NR2B) | NMDA receptor subunit | Contributes to BDNF-dependent long-term depression |
| GAD1 | Glutamate decarboxylase 1 | GABA synthesis enzyme affected by BDNF modulation |
| GAD2 | Glutamate decarboxylase 2 | GABA synthesis enzyme affected by BDNF modulation |
| SNAP25 | Synaptic vesicle protein | Involved in activity-dependent BDNF release |
| SYN1 | Synapsin I | Regulates synaptic vesicle trafficking during BDNF release |
| CAMK2A | Calcium/calmodulin-dependent kinase II | Downstream effector of BDNF-TrkB signaling |
How Is brain-derived neurotrophic factor receptor activity Regulated?
BDNF receptor activity is regulated at multiple levels. Expression of BDNF itself is influenced by exercise through the ketone body β-hydroxybutyrate, which promotes BDNF expression and thus indirectly enhances receptor activation. Activity-dependent release of BDNF provides a feedback mechanism that adjusts receptor signaling according to neuronal activity. In the perirhinal cortex, astrocyte BDNF-TrkB signaling is not required for long-term potentiation, indicating that the cellular source of BDNF and the context of receptor expression determine regulatory outcomes. Additionally, BDNF can modulate GABA(A) receptor-mediated responses via postsynaptic mechanisms, showing that receptor activity is integrated with inhibitory neurotransmission.
brain-derived neurotrophic factor receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NTRK2 | Cancer (tumor survival and metastasis) | TrkB knockout or point-mutation cell lines |
| BDNF | Multiple sclerosis / EAE | BDNF knockout mice or conditional knockouts |
| NTRK2 | Impaired post-stroke recovery | TrkB conditional knockout in neurons |
| BDNF | Fear conditioning deficits | BDNF or TrkB knockout in amygdala |
| GABAAR subunits | Altered inhibitory neurotransmission | Point mutations in GABA(A) receptor subunits |
BDNF Receptor Activity in Cancer
TrkB and BDNF are expressed in various cancers, where they can promote tumor cell survival, proliferation, and metastasis. The role of TrkB receptor and BDNF in cancer has been documented, highlighting the potential of targeting this pathway in oncology.
Multiple Sclerosis and Autoimmune Encephalomyelitis
BDNF and TrkB receptor are involved in experimental autoimmune encephalomyelitis and multiple sclerosis. Altered BDNF-TrkB signaling may contribute to neuroinflammation and demyelination, making it a potential therapeutic target.
Stroke Recovery and Neurorehabilitation
Post-stroke recovery depends on activity-dependent release of BDNF, which acts on TrkB receptors to promote plasticity and functional improvement. Enhancing this signaling could support rehabilitation strategies.
Fear Conditioning and Anxiety Disorders
BDNF and TrkB receptor involvement in amygdala-dependent fear conditioning suggests that dysregulation of this pathway may contribute to anxiety and trauma-related disorders.
From brain-derived neurotrophic factor receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of TrkB abolish BDNF signaling? | TrkB knockout (KO) cell lines or mice |
| How do specific point mutations in TrkB affect kinase activity? | Point-mutation knock-in of NTRK2 |
| Can a tagged TrkB be used to track receptor trafficking? | Tagged knock-in of NTRK2 |
| Does overexpression of BDNF enhance synaptic plasticity? | BDNF overexpression models |
| What is the role of astrocyte BDNF-TrkB signaling in LTP? | Conditional knockout of TrkB in astrocytes |
| How does BDNF modulate GABA(A) receptor function? | Knockout of BDNF or TrkB in cerebellar granule cells |
How to Study the brain-derived neurotrophic factor receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR-Cas9 knockout | Loss of gene function | Study necessity of BDNF or TrkB |
| Electrophysiology | Neuronal excitability and synaptic currents | Measure effects of BDNF on LTD |
| Fear conditioning | Learning and memory behavior | Assess amygdala-dependent fear |
| Western blot | Protein phosphorylation and expression | Detect TrkB autophosphorylation |
| Immunohistochemistry | Protein localization in tissue | Visualize TrkB expression |
| RNA-seq | Transcriptional changes | Identify genes regulated by BDNF signaling |
| Proteomics | Protein-protein interactions | Map downstream signaling complexes |
| Live-cell imaging | Receptor trafficking and dynamics | Track tagged TrkB in neurons |
Genetic Knockout and Knockdown
CRISPR-Cas9 or RNA interference can be used to knock out or knockdown BDNF or NTRK2 to study loss of receptor activity. These approaches help determine the necessity of BDNF-TrkB signaling in specific cellular contexts.
Pharmacological and Electrophysiological Assays
Electrophysiology combined with pharmacological inhibitors or activators of TrkB can measure changes in neuronal excitability and synaptic plasticity, as demonstrated in the oval nucleus of the BNST and cerebellar granule cells.
Behavioral and Imaging Studies
Fear conditioning paradigms and in vivo imaging can assess the role of BDNF receptor activity in learning and memory. Amygdala-dependent fear conditioning is a well-established behavioral model.
Biochemical and Proteomic Approaches
Immunoprecipitation, Western blotting, and mass spectrometry can identify downstream signaling partners and phosphorylation events following BDNF stimulation. These methods are essential for mapping the molecular mechanism of GO:0060175.
How CRISPR Can Be Used to Study GO:0060175 brain-derived neurotrophic factor receptor activity
Knockout
CRISPR knockout of NTRK2 or BDNF can completely abolish BDNF receptor activity, allowing researchers to study loss-of-function phenotypes in neurons and cancer cells.
Point Mutation
Introducing point mutations in the kinase domain of NTRK2 can dissect specific signaling outputs, such as distinguishing between survival and plasticity pathways.
Knock-in
Knock-in of tagged TrkB (e.g., GFP or HA) enables real-time tracking of receptor localization and trafficking in live cells.
Overexpression
Overexpression of BDNF or TrkB using CRISPR activation or lentiviral delivery can enhance receptor activity and study gain-of-function effects on synaptic plasticity and behavior.
How EDITGENE Supports brain-derived neurotrophic factor receptor activity Research
Researchers studying brain-derived neurotrophic factor receptor activity-related genes often need to determine whether a candidate gene is causally involved in signaling, disease, or development. EDITGENE provides a comprehensive suite of CRISPR-based services to create precisely engineered cell models that answer these questions.
Contact EDITGENE today to design your custom CRISPR model for brain-derived neurotrophic factor receptor activity research.
Frequently Asked Questions About brain-derived neurotrophic factor receptor activity
What is GO:0060175?
GO:0060175 is the Gene Ontology term for brain-derived neurotrophic factor receptor activity, defined as combining with BDNF and transmitting a signal across the plasma membrane to initiate a change in cell activity.
What genes are involved in brain-derived neurotrophic factor receptor activity?
The key genes are BDNF (the ligand) and NTRK2 (TrkB, the receptor), along with downstream effectors like MAPK1, AKT1, and PLCG1.
What is the role of TrkB in BDNF signaling?
TrkB is a receptor tyrosine kinase that binds BDNF, autophosphorylates, and activates downstream pathways controlling neuronal survival, plasticity, and excitability.
How is BDNF receptor activity regulated?
It is regulated by activity-dependent BDNF release, exercise-induced BDNF expression via β-hydroxybutyrate, and cell-type-specific factors.
What diseases are associated with BDNF receptor activity?
Dysregulation is linked to cancer, multiple sclerosis, stroke recovery, and fear-related disorders.
Can CRISPR be used to study BDNF receptor activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect BDNF-TrkB signaling.
What methods are used to measure BDNF receptor activity?
Electrophysiology, Western blot, fear conditioning, RNA-seq, and proteomics are commonly used.
Is astrocyte BDNF-TrkB signaling required for LTP?
In the perirhinal cortex, astrocyte BDNF-TrkB signaling is not required for long-term potentiation, indicating region-specific roles.
How does BDNF affect GABA(A) receptors?
BDNF attenuates GABA(A) receptor-mediated responses in cerebellar granule cells via postsynaptic mechanisms.
What is the clinical relevance of BDNF receptor activity?
It is a potential therapeutic target for neurological disorders, cancer, and rehabilitation after stroke.
Conclusion
GO:0060175, brain-derived neurotrophic factor receptor activity, is a fundamental molecular function that mediates BDNF signaling through the TrkB receptor. It controls critical neuronal processes such as synaptic plasticity, excitability, and fear conditioning, and its dysregulation is implicated in cancer, multiple sclerosis, and stroke recovery. Understanding the precise mechanisms and regulatory context of this activity is essential for developing targeted therapies. EDITGENE offers advanced CRISPR services to create custom cell models for studying BDNF receptor activity and its related genes.
References
- 1. Sleiman SF et al.. 2016. Exercise promotes the expression of brain derived neurotrophic factor (BDNF) through the action of the ketone body β-hydroxybutyrate.. Elife 5 PMID: 27253067
- 2. Serafim Junior V et al.. 2020. Role of Tropomyosin-related kinase B receptor and brain-derived neurotrophic factor in cancer.. Cytokine 136:155270 PMID: 32911446
- 3. Fiedler D et al.. 2021. Brain-Derived Neurotrophic Factor/Tropomyosin Receptor Kinase B Signaling Controls Excitability and Long-Term Depression in Oval Nucleus of the BNST.. J Neurosci 41(3):435-445 PMID: 33234610
- 4. Berretta A et al.. 2014. Post-stroke recovery: the role of activity-dependent release of brain-derived neurotrophic factor.. Expert Rev Neurother 14(11):1335-44 PMID: 25319267
- 5. De Santi L et al.. 2009. Brain-derived neurotrophic factor and TrkB receptor in experimental autoimmune encephalomyelitis and multiple sclerosis.. J Neurol Sci 287(1-2):17-26 PMID: 19758606
- 6. Vignoli B et al.. 2022. Perirhinal Cortex LTP Does Not Require Astrocyte BDNF-TrkB Signaling.. Cells 11(9) PMID: 35563806
- 7. Cheng Q et al.. 2003. Brain-derived neurotrophic factor attenuates mouse cerebellar granule cell GABA(A) receptor-mediated responses via postsynaptic mechanisms.. J Physiol 548(Pt 3):711-21 PMID: 12640011
- 8. Rattiner LM et al.. 2004. Brain-derived neurotrophic factor and tyrosine kinase receptor B involvement in amygdala-dependent fear conditioning.. J Neurosci 24(20):4796-806 PMID: 15152040
