GO:0004995 tachykinin receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004995 (tachykinin receptor activity) describes the molecular function of receptors that bind tachykinin neuropeptides and transmit signals by activating associated G-proteins.
• The tachykinin receptor family includes NK1R (TACR1), NK2R (TACR2), and NK3R (TACR3), which differ in ligand selectivity and tissue distribution.
• Tachykinin receptors are implicated in pain transmission, neurogenic inflammation, anxiety, and cancer biology, including glioblastoma.
• Substance P and other tachykinins act as endogenous ligands, and receptor selectivity can be probed with synthetic analogs and antagonists.
• Experimental models for studying tachykinin receptor activity include receptor-selective agonists/antagonists, knockout mice, and CRISPR-engineered cell lines.
• CRISPR-based knockout, point mutation, knock-in, and overexpression models enable causal dissection of tachykinin receptor signaling in disease.
Description
Tachykinin receptor activity (GO:0004995) is a molecular function defined by the binding of tachykinin neuropeptides and the subsequent transmission of a signal across the membrane via activation of an associated G-protein. This activity is central to neuropeptide signaling in the nervous system and peripheral tissues, where it regulates processes such as nociception, inflammation, and smooth muscle contraction. The tachykinin family includes substance P, neurokinin A, and neurokinin B, which preferentially activate NK1, NK2, and NK3 receptors, respectively. Because these receptors are widely expressed and modulate diverse physiological responses, they are important targets for both basic research and therapeutic development. Researchers study tachykinin receptor activity to understand how neuropeptides control neuronal excitability and immune responses, and to identify pharmacological tools that can selectively modulate receptor subtypes. Dysregulation of tachykinin signaling has been linked to pain, anxiety, and tumor progression, making these receptors relevant to multiple disease areas. The availability of receptor-selective agonists and antagonists has advanced our understanding of subtype-specific functions. This article provides a research-grade overview of GO:0004995, covering its definition, mechanism, key genes, disease associations, and experimental methods, with a focus on how CRISPR-based models can be used to interrogate tachykinin receptor biology.
tachykinin receptor activity At A Glance
| GO ID | GO:0004995 |
|---|---|
| GO term | tachykinin receptor activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding tachykinin neuropeptides and activating G-protein-mediated signaling |
| Ligand class | Tachykinin neuropeptides including substance P, neurokinin A, and neurokinin B |
| Receptor subtypes | NK1R (TACR1), NK2R (TACR2), NK3R (TACR3) |
| Signaling mechanism | G-protein activation leading to downstream second messenger pathways |
| Tissue distribution | Central and peripheral nervous system, immune cells, and other tissues |
What Is GO:0004995?
Tachykinin receptor activity (GO:0004995) is the molecular function of combining with a tachykinin neuropeptide and transmitting the signal across the membrane by activating an associated G-protein. This definition captures both the ligand-binding event and the downstream G-protein activation that together constitute receptor function.
Why Is tachykinin receptor activity Important in Cell Biology?
Tachykinin receptor activity is important because it mediates fundamental neuropeptide signaling that influences pain perception, neurogenic inflammation, anxiety, and tumor biology. Understanding this activity at the molecular level can inform the development of receptor-selective therapeutics and provide mechanistic insights into diseases where tachykinin signaling is dysregulated.
• Mediates nociceptive signaling in the spinal cord and brain.
• Regulates neurogenic inflammation and immune cell function.
• Modulates anxiety-like behaviors and stress responses.
• Promotes proliferation and survival in some cancer cells, including glioblastoma.
• Provides targets for receptor-selective agonists and antagonists.
• Enables studies of G-protein-coupled receptor signaling specificity.
• Involved in smooth muscle contraction and gastrointestinal motility.
• Serves as a model for neuropeptide receptor pharmacology.
Molecular Mechanism of tachykinin receptor activity
Ligand binding and receptor activation
In simple terms: A tachykinin peptide binds to the receptor, causing the receptor to change shape and activate a G-protein inside the cell.
Tachykinin receptors are G-protein-coupled receptors that bind tachykinin neuropeptides such as substance P, neurokinin A, and neurokinin B. Ligand binding induces conformational changes that enable the receptor to act as a guanine nucleotide exchange factor for an associated G-protein, thereby transmitting the signal across the membrane.
G-protein coupling and downstream signaling
In simple terms: Once activated, the G-protein triggers a cascade of signals inside the cell.
Activated tachykinin receptors couple to G-proteins, leading to downstream signaling events that can include activation of phospholipase C and increases in intracellular calcium. The specific G-protein subtypes and downstream effectors can vary by receptor subtype and cell context.
Receptor subtype selectivity
In simple terms: Different tachykinin receptors prefer different peptide ligands, which determines which signals are turned on.
NK1R, NK2R, and NK3R exhibit preferential binding for substance P, neurokinin A, and neurokinin B, respectively, although cross-reactivity can occur. Structure-activity relationship studies have identified peptide modifications that enhance subtype selectivity, enabling targeted pharmacological probes.
Regulation and desensitization
In simple terms: After signaling, the receptor can be turned off or recycled to prevent overstimulation.
Tachykinin receptor activity is subject to regulation by mechanisms such as receptor phosphorylation, internalization, and desensitization, which are common features of G-protein-coupled receptor signaling. These regulatory processes help terminate the signal and maintain cellular responsiveness.
Key Genes Involved in GO:0004995 tachykinin receptor activity
The following genes encode receptors and related proteins that mediate tachykinin receptor activity and its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TACR1 | Encodes NK1 receptor, binds substance P | Target for pain, inflammation, and anti-tumor studies |
| TACR2 | Encodes NK2 receptor, binds neurokinin A | Studied for smooth muscle contraction and gastrointestinal function |
| TACR3 | Encodes NK3 receptor, binds neurokinin B | Implicated in pain and anxiety comorbidity |
| TAC1 | Encodes substance P and neurokinin A precursors | Ligand source for tachykinin receptor activation |
| TAC3 | Encodes neurokinin B precursor | Ligand for NK3 receptor |
| GNAQ | G-protein alpha subunit that can couple to tachykinin receptors | Downstream signaling mediator |
| GNA11 | G-protein alpha subunit involved in GPCR signaling | Potential coupling partner for tachykinin receptors |
| PLCB1 | Phospholipase C beta 1, downstream effector | Mediates calcium signaling following receptor activation |
| ARRB1 | Beta-arrestin 1, involved in receptor desensitization | Regulates tachykinin receptor internalization |
| ARRB2 | Beta-arrestin 2, involved in receptor desensitization | Modulates receptor trafficking |
| GRK2 | G-protein-coupled receptor kinase 2 | Phosphorylates activated receptors |
| GRK5 | G-protein-coupled receptor kinase 5 | Contributes to receptor desensitization |
| PRKCA | Protein kinase C alpha, downstream target | Modulates signaling cascades |
| PRKCB | Protein kinase C beta, downstream target | Involved in receptor-mediated responses |
| CALM1 | Calmodulin 1, calcium sensor | Participates in calcium-dependent signaling |
| SRC | Proto-oncogene tyrosine-protein kinase Src | Can be activated downstream of GPCRs |
| MAPK1 | Mitogen-activated protein kinase 1 | Transmits signals to nuclear responses |
How Is tachykinin receptor activity Regulated?
Tachykinin receptor activity is regulated at multiple levels, including receptor phosphorylation by G-protein-coupled receptor kinases, binding of arrestins, and subsequent internalization. These processes control the duration and intensity of signaling and are common regulatory mechanisms for G-protein-coupled receptors.
tachykinin receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TACR1 | Glioblastoma, pain, inflammation | U373 MG xenograft, TACR1 knockout mice |
| TACR3 | Pain and anxiety comorbidity | Lateral habenula-specific knockout or overexpression in mice |
| TACR1 | Neurogenic inflammation | Cell lines with receptor overexpression or knockout |
| TACR2 | Smooth muscle disorders | Tissue-specific knockout models |
| TAC1 | Pain transmission | TAC1 knockout mice |
Tachykinin receptors in cancer
Tachykinin NK1 receptor antagonists have demonstrated anti-tumour activity in human glioma U373 MG xenograft models, suggesting that tachykinin receptor signaling can promote tumor growth. Additionally, a potential glioblastoma-targeted therapy based on a substance P analog has been evaluated for tachykinin receptor selectivity, highlighting the relevance of these receptors in brain tumors.
Tachykinin receptors in pain and anxiety
Tachykinin receptor 3 in the lateral habenula has been shown to alleviate pain and anxiety comorbidity in mice, indicating a role for NK3R in affective and nociceptive processing. Spinal release of histamine is involved in nociceptive behaviors induced by intrathecally administered spermine, a process that may intersect with tachykinin signaling.
Tachykinin receptors in neuropharmacology
The tachykinin NK1 receptor in the brain has been studied for its pharmacology and putative functions, including modulation of stress and emotional responses. Opioid activity of sendide, a tachykinin NK1 receptor antagonist, further illustrates the interplay between tachykinin and opioid systems in pain modulation.
From tachykinin receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does TACR1 mediate glioma growth? | TACR1 knockout in U373 MG cells or xenografts |
| What is the role of TACR3 in anxiety? | TACR3 knockout or overexpression in mouse lateral habenula |
| How does receptor selectivity affect signaling? | Point mutations in ligand-binding pocket of TACR1/2/3 |
| Can we track receptor localization? | Knock-in of fluorescent tags at endogenous TACR loci |
| Does overexpression alter downstream signaling? | TACR1 overexpression in cell lines |
| What are the effects of receptor antagonists? | Pharmacological inhibition in wild-type and knockout models |
How to Study the tachykinin receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioligand binding | Receptor-ligand affinity and selectivity | Characterizing NK1/NK2/NK3 pharmacology |
| Calcium imaging | Intracellular calcium changes | Measuring receptor activation in live cells |
| IP1 accumulation assay | Phospholipase C activity | Quantifying Gq-coupled signaling |
| Western blot | Protein expression and phosphorylation | Assessing receptor and downstream targets |
| Immunohistochemistry | Receptor localization in tissues | Mapping NK1R distribution in brain |
| Behavioral nociception tests | Pain responses in rodents | Evaluating receptor roles in pain |
| CRISPR knockout | Loss of receptor function | Causal testing in cell and animal models |
| RNA-seq | Transcriptional changes | Identifying downstream gene expression programs |
Pharmacological characterization
Receptor-selective agonists and antagonists are used to probe tachykinin receptor activity and subtype specificity. These tools allow researchers to dissect ligand-receptor interactions and downstream effects.
Genetic knockout and knock-in models
Knockout mice and CRISPR-engineered cell lines lacking specific tachykinin receptors help establish causal roles in pain, anxiety, and cancer. Knock-in of reporter genes enables visualization of receptor expression.
Signaling assays
Measurements of intracellular calcium, inositol phosphates, and G-protein activation are commonly used to quantify tachykinin receptor signaling. These assays can be combined with receptor mutagenesis to map structure-function relationships.
Behavioral and physiological testing
Nociceptive and anxiety-like behaviors in rodents are used to assess the contribution of tachykinin receptors to complex phenotypes. Such tests often complement molecular and cellular analyses.
How CRISPR Can Be Used to Study GO:0004995 tachykinin receptor activity
Knockout
CRISPR knockout of TACR1, TACR2, or TACR3 can eliminate receptor activity to test its necessity in disease models such as glioblastoma or pain. Knockout cell lines provide a clean background for re-expression studies.
Point Mutation
Point mutations in the ligand-binding pocket or G-protein coupling domains of tachykinin receptors can reveal residues critical for subtype selectivity and signaling. Such mutations help dissect structure-activity relationships.
Knock-in
Knock-in of epitope tags or fluorescent proteins at endogenous TACR loci allows real-time tracking of receptor expression and trafficking. This approach preserves native regulatory elements.
Overexpression
Overexpression of wild-type or mutant tachykinin receptors in cell lines can amplify signaling for biochemical assays and drug screening. It is useful for studying gain-of-function effects.
How EDITGENE Supports tachykinin receptor activity Research
Researchers studying tachykinin receptor activity-related genes often need to determine whether a candidate gene is causally involved in receptor signaling, disease progression, or therapeutic response. EDITGENE provides CRISPR-based services to generate precisely engineered cell and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for tachykinin receptor activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| TACR1 Knockout HEK293 Cell Line | EDC90448 | Human | 6869 | Details Get a Quote |
| TACR2 Knockout HEK293 Cell Line | EDJ-KQ1602 | Human | 6865 | Details Get a Quote |
| TACR3 Knockout HEK293 Cell Line | EDJ-KQ1603 | Human | 6870 | Details Get a Quote |
| TACR2 Knockout HeLa Cell Line | EDJ-KQ54605 | Human | 6865 | Details Get a Quote |
| TACR1 Knockout HeLa Cell Line | EDJ-KQ54607 | Human | 6869 | Details Get a Quote |
| TACR3 Knockout HeLa Cell Line | EDJ-KQ54608 | Human | 6870 | Details Get a Quote |
| TACR2 Knockout A-549 Cell Line | EDJ-KQ63085 | Human | 6865 | Details Get a Quote |
| TACR1 Knockout A-549 Cell Line | EDJ-KQ63087 | Human | 6869 | Details Get a Quote |
| TACR3 Knockout A-549 Cell Line | EDJ-KQ63088 | Human | 6870 | Details Get a Quote |
| TACR2 Knockout HCT 116 Cell Line | EDJ-KQ71558 | Human | 6865 | Details Get a Quote |
| TACR1 Knockout HCT 116 Cell Line | EDJ-KQ71560 | Human | 6869 | Details Get a Quote |
| TACR3 Knockout HCT 116 Cell Line | EDJ-KQ71561 | Human | 6870 | Details Get a Quote |
Frequently Asked Questions About tachykinin receptor activity
What is tachykinin receptor activity?
Tachykinin receptor activity (GO:0004995) is the molecular function of binding a tachykinin neuropeptide and transmitting a signal across the membrane by activating an associated G-protein.
What genes are involved in tachykinin receptor activity?
The main genes are TACR1, TACR2, and TACR3, which encode the NK1, NK2, and NK3 receptors, respectively.
What are the tachykinin receptor subtypes?
The three subtypes are NK1R (TACR1), NK2R (TACR2), and NK3R (TACR3), which differ in ligand preference and tissue distribution.
How is tachykinin receptor activity regulated?
It is regulated by receptor phosphorylation, arrestin binding, and internalization, which desensitize the receptor after activation.
What diseases are associated with tachykinin receptors?
They are associated with pain, anxiety, neurogenic inflammation, and cancers such as glioblastoma.
What ligands activate tachykinin receptors?
Substance P, neurokinin A, and neurokinin B are endogenous tachykinin neuropeptides that activate these receptors.
How can I study tachykinin receptor activity in the lab?
Common methods include radioligand binding, calcium imaging, IP1 assays, and CRISPR knockout models.
Are there selective antagonists for tachykinin receptors?
Yes, receptor-selective antagonists such as sendide for NK1R have been developed and characterized.
What is the role of NK3R in pain and anxiety?
NK3R in the lateral habenula alleviates pain and anxiety comorbidity in mice.
Can CRISPR be used to model tachykinin receptor mutations?
Yes, CRISPR can generate knockout, point mutation, knock-in, and overexpression models for tachykinin receptor genes.
Conclusion
Tachykinin receptor activity (GO:0004995) is a key molecular function that mediates neuropeptide signaling in health and disease. Its involvement in pain, anxiety, inflammation, and cancer makes it a compelling target for basic and translational research. CRISPR-based models provide powerful tools to dissect the causal roles of TACR1, TACR2, and TACR3 and to evaluate therapeutic strategies.
References
- 1. Sakurada T et al.. 1999. Opioid activity of sendide, a tachykinin NK1 receptor antagonist.. Eur J Pharmacol 369(3):261-6 PMID: 10225361
- 2. Suthiram J et al.. 2023. Tachykinin Receptor-Selectivity of the Potential Glioblastoma-Targeted Therapy, DOTA-[Thi(8),Met(O(2))(11)]-Substance P.. Int J Mol Sci 24(3) PMID: 36768456
- 3. Mizoguchi H et al.. 2017. The involvement of spinal release of histamine on nociceptive behaviors induced by intrathecally administered spermine.. Eur J Pharmacol 800:9-15 PMID: 28131781
- 4. Palma C et al.. 2000. Anti-tumour activity of tachykinin NK1 receptor antagonists on human glioma U373 MG xenograft.. Br J Cancer 82(2):480-7 PMID: 10646908
- 5. Misu R et al.. 2013. Structure-activity relationship study of tachykinin peptides for the development of novel neurokinin-3 receptor selective agonists.. Bioorg Med Chem 21(8):2413-2417 PMID: 23473945
- 6. Almeida TA et al.. 2004. Tachykinins and tachykinin receptors: structure and activity relationships.. Curr Med Chem 11(15):2045-81 PMID: 15279567
- 7. Zhang WW et al.. 2023. Tachykinin receptor 3 in the lateral habenula alleviates pain and anxiety comorbidity in mice.. Front Immunol 14:1049739 PMID: 36756128
- 8. Saria A. 1999. The tachykinin NK1 receptor in the brain: pharmacology and putative functions.. Eur J Pharmacol 375(1-3):51-60 PMID: 10443564
