GO:0031894 V1A vasopressin receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031894 (V1A vasopressin receptor binding) is a molecular function describing the binding of a ligand to the V1A vasopressin receptor (AVPR1A).
• The V1A receptor is a G protein-coupled receptor that mediates the actions of arginine-vasopressin (AVP) in the brain and periphery.
• Binding of AVP to V1A receptors in the brain regulates social behavior, aggression, and stress responses.
• V1A receptor binding is sexually dimorphic and modulated by social status and gonadal hormones in rodents.
• Altered V1A receptor binding has been implicated in neuropsychiatric disorders and is a target for drug development.
• Researchers study V1A receptor binding using radioligand binding assays, autoradiography, and CRISPR-based genetic models.
Description
GO:0031894, V1A vasopressin receptor binding, is a molecular function term in the Gene Ontology that describes the selective interaction of a ligand with the V1A vasopressin receptor (AVPR1A). The V1A receptor is a member of the G protein-coupled receptor superfamily and is activated by the nonapeptide hormone arginine-vasopressin (AVP). This binding event is the first step in a signaling cascade that influences diverse physiological processes, including vasoconstriction, social recognition, and aggression. Understanding the molecular details of V1A receptor binding is essential for elucidating its role in health and disease. The V1A receptor is widely expressed in the brain, where it modulates social and emotional behaviors. In the Syrian hamster brain, V1A receptor binding and mRNA expression are regulated by androgens, highlighting the hormonal control of this system. Similarly, in the rhesus monkey brain, V1A receptor binding is localized to specific regions involved in social behavior. These findings underscore the importance of V1A receptor binding in neurobiology. Moreover, the V1A receptor is a therapeutic target for conditions such as heart failure, hypertension, and psychiatric disorders. Thus, studying GO:0031894 provides insights into both basic neurobiology and potential clinical applications.
V1A vasopressin receptor binding At A Glance
| GO ID | GO:0031894 |
|---|---|
| GO term | V1A vasopressin receptor binding |
| Ontology | molecular_function |
| Synonym | V1A vasopressin receptor ligand |
| Major function | Binding to the V1A vasopressin receptor (AVPR1A), initiating intracellular signaling. |
| Related receptor | AVPR1A (V1A receptor), a G protein-coupled receptor. |
| Endogenous ligand | Arginine-vasopressin (AVP). |
| Tissue distribution | Brain, vascular smooth muscle, liver, platelets. |
| Physiological roles | Vasoconstriction, social behavior, aggression, stress response. |
What Is GO:0031894?
V1A vasopressin receptor binding (GO:0031894) is defined as the binding to a V1A vasopressin receptor. This molecular function encompasses the interaction between a ligand, such as arginine-vasopressin or synthetic analogs, and the V1A receptor protein. The term is used to annotate gene products that physically interact with the V1A receptor, including the endogenous hormone AVP and exogenous pharmacological agents.
Why Is V1A vasopressin receptor binding Important in Cell Biology?
V1A vasopressin receptor binding is critically important because it initiates signaling pathways that regulate cardiovascular homeostasis and complex social behaviors. Dysregulation of this binding has been linked to neuropsychiatric disorders, and the receptor is a target for drugs used in heart failure and hyponatremia. Furthermore, species-specific differences in V1A receptor binding patterns provide insights into the evolution of social behavior.
• Regulates vasoconstriction and blood pressure.
• Modulates social recognition, pair bonding, and aggression.
• Influenced by gonadal hormones such as androgens.
• Exhibits sexual dimorphism in brain regions.
• Altered in neuropsychiatric conditions like autism and anxiety.
• Target for pharmacological interventions in cardiovascular disease.
• Used as a marker for mapping vasopressinergic circuits.
• Provides a model for studying GPCR-ligand interactions.
• Regulated by phosphorylation and desensitization mechanisms.
• Species differences inform evolutionary neurobiology.
Molecular Mechanism of V1A vasopressin receptor binding
Ligand recognition and binding pocket
In simple terms: The V1A receptor has a specific pocket where arginine-vasopressin or similar molecules fit and bind.
The V1A vasopressin receptor binds its endogenous ligand arginine-vasopressin (AVP) with high affinity. The binding site is formed by transmembrane helices and extracellular loops, and specific residues determine ligand selectivity. Studies with pyroglutamate-substituted linear antagonists have probed the V1A receptor binding site, revealing key interactions required for high-affinity binding.
Receptor activation and conformational change
In simple terms: When a ligand binds, the receptor changes shape to activate signaling inside the cell.
Upon AVP binding, the V1A receptor undergoes conformational changes that enable it to act as a guanine nucleotide exchange factor for Gq/11 proteins. This leads to activation of phospholipase C and production of inositol trisphosphate and diacylglycerol, mobilizing intracellular calcium. The binding event is therefore the trigger for downstream signaling cascades.
Phosphorylation and desensitization
In simple terms: After activation, the receptor gets tagged with phosphate groups, which turns off the signal.
Agonist binding to the V1A receptor induces transient phosphorylation of the receptor, primarily on serine and threonine residues in the C-terminal tail. This phosphorylation is mediated by G protein-coupled receptor kinases and leads to beta-arrestin recruitment, receptor internalization, and desensitization. This regulatory mechanism controls the duration and intensity of V1A receptor signaling.
Regulation by steroid hormones
In simple terms: Hormones like testosterone can change how much V1A receptor is available for binding.
In the Syrian hamster brain, V1A receptor binding and mRNA expression are regulated by androgens. Castration reduces V1A receptor binding in specific brain regions, and testosterone replacement restores it, indicating transcriptional regulation by steroid hormones. This hormonal modulation contributes to sex differences in social behavior.
Species-specific and sex-specific binding patterns
In simple terms: Different species and sexes have different patterns of V1A receptor binding in the brain.
Autoradiographic studies in Mongolian gerbils and Syrian hamsters have revealed distinct distributions of V1A receptor binding in the basal forebrain and midbrain, with sex differences in some regions. These patterns correlate with social and aggressive behaviors, suggesting that V1A receptor binding is a key determinant of behavioral diversity.
Key Genes Involved in GO:0031894 V1A vasopressin receptor binding
The following genes and proteins are central to V1A vasopressin receptor binding and its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AVPR1A | Encodes the V1A vasopressin receptor, the primary binding target | Central to studies of social behavior, aggression, and cardiovascular function |
| AVP | Encodes arginine-vasopressin, the endogenous ligand that binds V1A receptor | Used in binding assays and to study receptor activation |
| GNAQ | Encodes Gq alpha subunit, mediates V1A receptor signaling | Target for investigating downstream signaling pathways |
| GNA11 | Encodes G11 alpha subunit, alternative G protein for V1A receptor | Studied in receptor coupling specificity |
| GRK2 | G protein-coupled receptor kinase 2, phosphorylates activated V1A receptor | Involved in receptor desensitization and internalization |
| ARRB1 | Beta-arrestin 1, recruited to phosphorylated V1A receptor | Mediates receptor internalization and signaling switch |
| PLCB1 | Phospholipase C beta 1, effector enzyme activated by Gq | Key node in V1A receptor signaling cascade |
| ITPR1 | Inositol 1,4,5-trisphosphate receptor, mediates calcium release | Downstream target of V1A receptor activation |
| PRKCA | Protein kinase C alpha, activated by diacylglycerol | Modulates downstream cellular responses |
| AVPR1B | V1B vasopressin receptor, related subtype with distinct binding profile | Used in comparative studies of receptor specificity |
| AVPR2 | V2 vasopressin receptor, primarily renal | Contrasts with V1A in binding and function |
| OXTR | Oxytocin receptor, structurally related to V1A | Often studied alongside V1A in social behavior |
| ESR1 | Estrogen receptor alpha, may influence V1A receptor expression | Potential crosstalk in sex-specific regulation |
| AR | Androgen receptor, regulates V1A receptor transcription | Key mediator of hormonal effects on V1A binding |
| FOS | Immediate early gene, induced by V1A receptor activation | Marker of neuronal activation following V1A binding |
| CREB1 | Transcription factor, downstream of V1A signaling | Involved in long-term effects of V1A activation |
| MAPK1 | Mitogen-activated protein kinase 1, activated by V1A receptor | Links V1A binding to cell proliferation and gene expression |
| MAPK3 | Mitogen-activated protein kinase 3, activated by V1A receptor | Parallel to MAPK1 in signaling |
How Is V1A vasopressin receptor binding Regulated?
V1A vasopressin receptor binding is regulated at multiple levels. Receptor availability is controlled by transcriptional regulation via steroid hormones such as androgens, as shown in the Syrian hamster brain where castration reduces V1A receptor binding and testosterone restores it. Post-translationally, agonist-induced phosphorylation of the receptor by GRK2 leads to beta-arrestin recruitment and desensitization, thereby reducing binding capacity. Additionally, social status and sex can modulate V1A receptor binding in a region-specific manner, as observed in Syrian hamsters. These regulatory mechanisms ensure dynamic control of V1A receptor signaling in response to physiological and environmental cues.
V1A vasopressin receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AVPR1A | Autism spectrum disorder, social behavior deficits | AVPR1A knockout mouse, social interaction tests |
| AVPR1A | Hypertension, heart failure | Vascular smooth muscle cell-specific knockout |
| AVPR1A | Aggression and social status | Syrian hamster model with social status manipulation |
| AVP | Central diabetes insipidus, hyponatremia | AVP knockout or infusion models |
| AVPR1A | Anxiety and depression | Conditional knockout in limbic regions |
V1A receptor binding in neuropsychiatric disorders
Alterations in V1A vasopressin receptor binding have been associated with neuropsychiatric conditions such as autism spectrum disorder, anxiety, and depression. The receptor is highly expressed in brain regions that regulate social behavior, and changes in binding density or affinity may contribute to social deficits. For example, in the rhesus monkey brain, V1A receptor binding is localized to areas involved in social cognition, suggesting that dysregulation could underlie social dysfunction.
Cardiovascular implications of V1A receptor binding
The V1A receptor mediates vasoconstriction, and its overactivation contributes to hypertension and heart failure. Binding of AVP to V1A receptors on vascular smooth muscle cells triggers calcium mobilization and contraction. Consequently, V1A receptor antagonists are explored as therapeutic agents for cardiovascular diseases.
Role in aggression and social behavior
V1A receptor binding in the brain is a key determinant of aggression and social behavior. In Syrian hamsters, social status and sex influence V1A receptor binding in regions such as the lateral septum and medial amygdala, which are critical for aggression. These findings suggest that targeting V1A receptor binding could modulate social behaviors in pathological conditions.
From V1A vasopressin receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does AVPR1A mediate social recognition? | AVPR1A knockout mouse (constitutive or conditional) |
| How does a point mutation in AVPR1A affect ligand binding? | CRISPR point-mutation knock-in mouse |
| What is the effect of AVPR1A overexpression in specific brain regions? | Viral-mediated overexpression or transgenic mouse |
| Can we visualize V1A receptor binding in vivo? | Tagged knock-in mouse (e.g., HA-tagged AVPR1A) |
| What are the downstream signaling events of V1A receptor activation? | Phospho-proteomics in wild-type vs. knockout cells |
| How does social status alter V1A receptor binding? | Syrian hamster model with dominance hierarchy |
How to Study the V1A vasopressin receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioligand binding assay | Binding affinity (Kd) and receptor density (Bmax) | Characterizing V1A receptor in membrane preparations |
| Autoradiography | Spatial distribution of V1A receptor binding sites | Mapping receptor binding in brain sections |
| Quantitative RT-PCR | V1A receptor mRNA expression levels | Assessing transcriptional regulation |
| In situ hybridization | Cellular localization of V1A receptor mRNA | Identifying cells expressing the receptor |
| Phosphorylation assay | Agonist-induced receptor phosphorylation | Studying desensitization mechanisms |
| CRISPR knockout | Loss of V1A receptor function | Determining causal role in behavior |
| CRISPR knock-in | Tagged or mutant V1A receptor expression | Visualizing receptor or testing point mutations |
| Behavioral assays | Social and aggressive behaviors | Linking V1A binding to behavior |
Radioligand binding assays
Radioligand binding assays using tritiated or iodinated AVP analogs are the gold standard for measuring V1A receptor binding affinity and density. These assays can be performed on membrane preparations from tissues or cells expressing recombinant receptor. Competitive binding with antagonists such as pyroglutamate-substituted linear antagonists helps characterize the binding site.
Autoradiography
Autoradiography with radiolabeled ligands allows visualization of V1A receptor binding sites in tissue sections, providing anatomical resolution. This technique has been used to map V1A receptor binding in the brains of various species, including Mongolian gerbils and rhesus monkeys. It is particularly useful for comparing binding patterns across brain regions and between sexes.
Molecular biology techniques
Quantitative RT-PCR and in situ hybridization measure V1A receptor mRNA levels, complementing binding data. These methods have revealed transcriptional regulation by androgens in the Syrian hamster brain. Additionally, phosphorylation-specific antibodies can detect agonist-induced receptor phosphorylation.
CRISPR-based genetic models
CRISPR/Cas9 technology enables the generation of knockout, point-mutation, and knock-in models to study V1A receptor binding in vivo. For example, AVPR1A knockout mice have been used to investigate social behavior, while tagged knock-in mice allow visualization of receptor localization. These models provide causal insights that complement pharmacological and binding studies.
How CRISPR Can Be Used to Study GO:0031894 V1A vasopressin receptor binding
Knockout
CRISPR/Cas9-mediated knockout of AVPR1A eliminates V1A receptor binding, providing a clean genetic model to study loss-of-function effects. AVPR1A knockout mice exhibit deficits in social recognition and altered aggression, confirming the receptor's role in these behaviors. Knockout models are essential for distinguishing the specific contributions of V1A receptor binding from other vasopressin receptor subtypes.
Point Mutation
Point mutations introduced by CRISPR base editing or homology-directed repair can alter specific residues in the V1A receptor binding pocket. Such models help identify amino acids critical for ligand binding and receptor activation. For example, mutations in the binding site can mimic naturally occurring variants associated with disease or affect pharmacological responses.
Knock-in
Knock-in of tagged AVPR1A (e.g., HA or GFP) using CRISPR allows real-time visualization of receptor localization and trafficking without affecting binding properties. This approach is valuable for studying receptor dynamics in vivo and for validating antibody specificity. Knock-in models can also introduce humanized receptor sequences to study species-specific binding.
Overexpression
CRISPR activation (CRISPRa) or transgenic insertion can overexpress AVPR1A in specific cell types or brain regions. Overexpression models are useful for gain-of-function studies, such as examining the effects of increased V1A receptor binding on behavior or cardiovascular function. These models complement knockout studies to provide a comprehensive understanding of V1A receptor dosage effects.
How EDITGENE Supports V1A vasopressin receptor binding Research
Researchers studying V1A vasopressin receptor binding-related genes often need to determine whether a candidate gene is causally involved in receptor function, behavior, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for V1A vasopressin receptor binding research.
Frequently Asked Questions About V1A vasopressin receptor binding
What is GO:0031894?
GO:0031894 is the Gene Ontology term for V1A vasopressin receptor binding, a molecular function describing the binding of a ligand to the V1A vasopressin receptor.
What genes are involved in V1A vasopressin receptor binding?
The primary gene is AVPR1A, which encodes the V1A receptor. The ligand is encoded by AVP. Downstream signaling involves GNAQ, PLCB1, and others.
What is the V1A receptor?
The V1A receptor is a G protein-coupled receptor that binds arginine-vasopressin and mediates vasoconstriction and social behaviors.
How is V1A receptor binding measured?
It is measured using radioligand binding assays, autoradiography, and molecular techniques such as RT-PCR.
What diseases are associated with V1A receptor binding?
Alterations in V1A receptor binding have been linked to autism, anxiety, hypertension, and heart failure.
Is V1A receptor binding different between males and females?
Yes, studies in rodents show sex differences in V1A receptor binding in specific brain regions.
How do hormones regulate V1A receptor binding?
Androgens such as testosterone can regulate V1A receptor binding and mRNA expression in the brain.
What is the role of V1A receptor binding in social behavior?
V1A receptor binding in brain regions like the lateral septum modulates social recognition, aggression, and pair bonding.
Can CRISPR be used to study V1A receptor binding?
Yes, CRISPR knockout, knock-in, and point mutation models are powerful tools to study V1A receptor function and binding.
What are the synonyms for GO:0031894?
The synonym is V1A vasopressin receptor ligand.
Conclusion
GO:0031894, V1A vasopressin receptor binding, is a fundamental molecular function that underlies the diverse physiological actions of arginine-vasopressin. From cardiovascular regulation to social behavior, the binding of AVP to the V1A receptor initiates signaling cascades with profound effects. Research using radioligand binding, autoradiography, and CRISPR models continues to unravel the complexities of this interaction, offering insights into neuropsychiatric and cardiovascular disorders. Targeting V1A receptor binding remains a promising therapeutic strategy.
References
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- 3. Howl J et al.. 1996. Probing the V1a vasopressin receptor binding site with pyroglutamate-substituted linear antagonists.. Neuropeptides 30(1):73-9 PMID: 8868303
- 4. Birnbaumer M. 2000. Vasopressin receptors.. Trends Endocrinol Metab 11(10):406-10 PMID: 11091117
- 5. Young LJ et al.. 2000. Vasopressin (V1a) receptor binding, mRNA expression and transcriptional regulation by androgen in the Syrian hamster brain.. J Neuroendocrinol 12(12):1179-85 PMID: 11106975
- 6. Innamorati G et al.. 1998. Transient phosphorylation of the V1a vasopressin receptor.. J Biol Chem 273(12):7155-61 PMID: 9507030
- 7. Young LJ et al.. 1999. Localization of vasopressin (V1a) receptor binding and mRNA in the rhesus monkey brain.. J Neuroendocrinol 11(4):291-7 PMID: 10223283
- 8. Grieb ZA et al.. 2021. Sex-dependent effects of social status on the regulation of arginine-vasopressin (AVP) V1a, oxytocin (OT), and serotonin (5-HT) 1A receptor binding and aggression in Syrian hamsters (Mesocricetus auratus).. Horm Behav 127:104878 PMID: 33148500
