nectin3 Antibody

What is Nectin-3 and why is it an important research target?

Nectin-3 (also known as PVRL3 or PRR3) is an 83 kDa type I transmembrane glycoprotein belonging to the immunoglobulin superfamily. It functions as a calcium-independent cell adhesion molecule that promotes cell-cell adhesion through heterophilic trans-interactions with other nectins or nectin-like molecules. Nectin-3 is primarily expressed in testis and placental tissues but is also found in brain and various cell lines. It's involved in the formation of several critical cellular junctions, including adherens junctions in epithelial cells, synaptic junctions in neurons, and Sertoli cell-spermatid junctions in testis. Three isoforms exist: nectin-3 alpha, beta, and gamma, with alpha being the largest. Its interaction with afadin links it to the actin cytoskeleton, influencing cellular signaling pathways and cytoskeletal dynamics .

What applications can Nectin-3 antibodies be used for in research?

Nectin-3 antibodies can be employed in multiple research applications:

These applications have been validated across human, mouse, and rat samples, though reactivity varies by antibody .

How do I choose between polyclonal and monoclonal Nectin-3 antibodies?

The choice between polyclonal and monoclonal antibodies depends on your research needs:

Polyclonal Nectin-3 Antibodies:

• Recognize multiple epitopes on the Nectin-3 protein

• Generally provide higher sensitivity in applications like Western blot

• Useful for detection of denatured proteins

• Examples include antibody PA5-47441 (polyclonal) and 11213-1-AP (polyclonal)

• Better for initial detection or when signal amplification is needed

Monoclonal Nectin-3 Antibodies:

• Recognize a single epitope with high specificity

• Provide more consistent results between experiments

• Reduced background compared to polyclonal antibodies

• Examples include EPR24274-4 (monoclonal) and H-11 (monoclonal)

• Preferred for applications requiring high reproducibility

For novel research where Nectin-3 detection is being established, using both types initially can help confirm findings before selecting the most appropriate antibody for your specific application .

How can I optimize Western blot protocols for Nectin-3 detection?

Optimizing Western blot for Nectin-3 detection requires attention to several factors:

• Sample Preparation:

  • Use tissues with known Nectin-3 expression (testis, brain) as positive controls

  • Observed molecular weight is typically 70-80 kDa, though the calculated weight is 61 kDa, suggesting post-translational modifications

  • Include appropriate lysis buffers with protease inhibitors to prevent degradation

• Antibody Selection and Dilution:

  • Start with recommended dilutions (1:1000-1:4000) and optimize as needed

  • Consider the specific isoform(s) your antibody recognizes (alpha, beta, or gamma)

• Blocking and Washing:

  • Use 5% non-fat milk or BSA in TBST for blocking

  • Include sufficient wash steps to reduce background

• Controls:

  • Include positive tissue controls (mouse/rat testis have shown consistent results)

  • Consider using a blocking peptide as a negative control to confirm specificity

• Visualization:

  • Secondary antibody selection should match the host species of your primary antibody

  • Adjust exposure times to optimize signal-to-noise ratio

Western blot analysis has successfully detected Nectin-3 in mouse and rat testis membranes, brain lysates, and human cell lines like U-87 MG glioblastoma cells .

What are the critical considerations for immunohistochemistry with Nectin-3 antibodies?

Successful immunohistochemistry (IHC) with Nectin-3 antibodies requires:

• Tissue Preparation:

  • Both frozen sections and paraffin-embedded tissues can be used

  • For paraffin sections, antigen retrieval is crucial; use TE buffer pH 9.0 or alternatively citrate buffer pH 6.0

• Antibody Optimization:

  • Start with dilutions in the 1:20-1:200 range for IHC applications

  • Incubation time and temperature significantly impact staining quality

• Controls:

  • Include positive tissue controls (human prostate cancer tissue has shown positive staining)

  • Use negative controls (primary antibody omission or isotype control)

• Signal Detection:

  • For fluorescence detection, select secondary antibodies that minimize autofluorescence

  • For chromogenic detection, optimize DAB exposure times

• Interpretation:

  • Nectin-3 typically shows membrane staining in positive cells

  • In rat parietal cortex, Nectin-3 immunoreactivity appears in pyramidal layer cells

When examining neural tissues, confocal microscopy can help distinguish between pre- and post-synaptic localization of Nectin-3, which can be critical for studies of synaptic function .

How do I validate the specificity of a Nectin-3 antibody?

Validating antibody specificity is crucial for reliable research results:

• Multiple Detection Methods:

  • Confirm results using different techniques (WB, IHC, IF)

  • Compare staining/banding patterns across techniques

• Blocking Peptide Competition:

  • Pre-incubate antibody with a specific blocking peptide

  • This should eliminate or significantly reduce signal if the antibody is specific

  • Multiple sources show successful blocking with Nectin-3 blocking peptides in Western blot and IHC applications

• Positive and Negative Controls:

  • Use tissues with known Nectin-3 expression (testis, brain) as positive controls

  • Include tissues or cell lines with low/no Nectin-3 expression as negative controls

• Cross-reactivity Assessment:

  • Test for cross-reactivity with related proteins (e.g., other nectin family members)

  • For example, one antibody showed less than 65% cross-reactivity with recombinant mouse Nectin-3 and less than 5% cross-reactivity with nectin-1, nectin-2, and nectin-4

• Knockdown/Knockout Validation:

  • When possible, use Nectin-3 knockdown/knockout samples as definitive controls

  • Signal should be reduced or absent in these samples

Proper validation ensures that your observations genuinely reflect Nectin-3 biology rather than non-specific binding or artifacts .

Why might I observe different molecular weights for Nectin-3 in Western blot?

Discrepancies in Nectin-3 molecular weight can occur for several reasons:

• Isoform Variation:

  • Nectin-3 has three isoforms (alpha, beta, gamma) with different molecular weights

  • The alpha isoform is the largest and most commonly detected

• Post-translational Modifications:

  • Nectin-3 is a glycoprotein with N-linked glycosylation sites

  • This can cause shifts in apparent molecular weight

  • The calculated molecular weight is 61 kDa, but the observed weight is often 70-80 kDa due to these modifications

• Sample Preparation:

  • Differences in sample denaturation, reduction, or buffer composition can affect migration

  • Different lysis buffers may preserve or disrupt protein complexes

• Tissue-Specific Variations:

  • Expression patterns can differ between tissues

  • For example, different banding patterns might be observed between brain and testis samples

• Antibody Specificity:

  • Different antibodies may recognize distinct epitopes or isoforms

  • Some may recognize degradation products or processed forms of the protein

When reporting Western blot results for Nectin-3, always include details about the specific antibody used, sample source, and observed molecular weight to help interpret your findings in context .

What factors may cause weak or absent staining in immunohistochemistry for Nectin-3?

Several factors can lead to suboptimal immunohistochemical staining for Nectin-3:

• Fixation Issues:

  • Overfixation can mask epitopes

  • Inadequate fixation can lead to tissue degradation and antigen loss

  • Optimize fixation time and conditions for your specific tissue

• Antigen Retrieval:

  • Insufficient or inappropriate antigen retrieval

  • For Nectin-3, TE buffer pH 9.0 is recommended, with citrate buffer pH 6.0 as an alternative

  • Optimize retrieval time and temperature for your specific tissue

• Antibody Factors:

  • Antibody concentration too low (start within 1:20-1:200 range)

  • Antibody degradation due to improper storage

  • Using antibodies validated for WB but not IHC

• Detection System:

  • Inappropriate secondary antibody

  • Expired or degraded detection reagents

  • Suboptimal incubation conditions

• Tissue-Specific Expression:

  • Low expression of Nectin-3 in your specific sample

  • Expression varies by tissue; strongest in testis, brain, and certain epithelial tissues

• Technical Execution:

  • Insufficient blocking leading to high background

  • Excessive washing leading to signal loss

  • Buffer incompatibility issues

When troubleshooting, systematically adjust one parameter at a time while keeping detailed records of modifications to identify the optimal protocol for your specific application .

How can I distinguish between specific and non-specific signals in Nectin-3 immunostaining?

Distinguishing specific from non-specific signals requires several control strategies:

• Blocking Peptide Controls:

  • Pre-incubate your Nectin-3 antibody with a specific blocking peptide

  • Compare staining patterns between blocked and unblocked antibody

  • Specific signals should be significantly reduced or eliminated in the blocked sample

• Multiple Antibodies:

  • Use different antibodies targeting distinct Nectin-3 epitopes

  • Consistency in staining pattern across antibodies suggests specificity

  • For example, compare results between polyclonal (PA5-47441) and monoclonal (EPR24274-4) antibodies

• Pattern Analysis:

  • Specific Nectin-3 staining should match its known cellular localization

  • Primarily membrane-associated at cell-cell junctions

  • In neurons, localized to synaptic junctions

  • In testis, present at Sertoli-spermatid junctions

• Positive and Negative Tissue Controls:

  • Include tissues with known high expression (testis, brain) as positive controls

  • Include tissues with minimal expression as negative controls

  • Utilize species-matched tissues whenever possible

• Technical Controls:

  • Omit primary antibody (secondary-only control)

  • Use isotype control antibodies at the same concentration

  • Include cell lines with known Nectin-3 expression profiles

• Quantitative Analysis:

  • Measure signal-to-background ratios

  • Compare staining intensity across different conditions

  • Use image analysis software for objective assessment

By implementing these controls systematically, you can confidently identify specific Nectin-3 signals and avoid misinterpretation of artifacts .

How can Nectin-3 antibodies be used to study the dynamics of cell-cell junctions?

Nectin-3 antibodies enable sophisticated analysis of junction dynamics through:

• Live Cell Imaging:

  • Use extracellular domain-targeting antibodies to label Nectin-3 on living cells

  • Cell surface detection has been demonstrated in live intact human Jurkat T-cell leukemia cells

  • Track junction formation and disassembly in real-time

• Co-localization Studies:

  • Perform double or triple immunofluorescence to examine:

    • Nectin-3 association with other junction proteins (cadherins, afadin)

    • Relationship to actin cytoskeleton

    • Changes during development or in response to stimuli

• Junction Perturbation Experiments:

  • Apply antibodies to disrupt specific Nectin-3 interactions

  • Injection of antibody 103-A1 into seminiferous tubules can disrupt actin filaments at Sertoli-maturing spermatid junctions, causing spermatid exfoliation

  • Assess functional consequences of junction disruption

• Super-Resolution Microscopy:

  • Use immunofluorescence with super-resolution techniques to:

    • Examine nanoscale organization of junctions

    • Investigate protein clustering and distribution

    • Analyze molecular proximity within junction complexes

• Calcium Signaling Analysis:

  • Combine Nectin-3 antibody staining with calcium indicators

  • Investigate how junction formation influences calcium dynamics

  • Assess signaling consequences of Nectin-3 engagement

These approaches facilitate detailed investigation of how Nectin-3 contributes to junction assembly, stability, and signaling in diverse cellular contexts .

What strategies can be employed to study Nectin-3 interactions with binding partners?

Several sophisticated approaches can investigate Nectin-3 interactions:

• Co-Immunoprecipitation (Co-IP):

  • Use Nectin-3 antibodies for IP (0.5-4.0 μg for 1.0-3.0 mg of protein lysate)

  • Identify binding partners through subsequent mass spectrometry

  • Confirm interactions by Western blot for specific proteins

  • Investigate how interactions change under different conditions

• Proximity Ligation Assay (PLA):

  • Detect protein-protein interactions in situ with high sensitivity

  • Particularly useful for studying Nectin-3 interactions with:

    • Other nectins (especially Nectin-2)

    • Afadin (actin-binding protein)

    • CD155 (Poliovirus Receptor)

    • Cadherins and associated proteins

• FRET/BRET Analysis:

  • Fluorescence or bioluminescence resonance energy transfer

  • Enables real-time monitoring of protein interactions

  • Assess binding dynamics and conformational changes

  • Particularly valuable for studying transient interactions

• Antibody Blocking Studies:

  • Use domain-specific antibodies to block particular interaction interfaces

  • Assess functional consequences on:

    • Junction formation and stability

    • Downstream signaling (CDC42 and RAC activation)

    • Cell movement and proliferation

• Heterophilic vs. Homophilic Binding:

  • Use purified proteins with antibody detection to distinguish:

    • Homophilic Nectin-3/Nectin-3 interactions

    • Heterophilic interactions with other nectins and nectin-like molecules

    • The role of specific domains in these interactions

These approaches provide mechanistic insights into how Nectin-3 mediates its diverse functions through protein-protein interactions .

How can Nectin-3 antibodies be applied in studying neurodevelopmental processes?

Nectin-3 antibodies offer valuable tools for investigating neural development:

• Neural Circuit Formation:

  • Examine Nectin-3 expression during critical periods of development

  • Track localization during synapse formation

  • Nectin-3 immunoreactivity has been observed in pyramidal layer cells of rat parietal cortex

  • Investigate the role of Nectin-3 in axon guidance and commissural axon contacts with floor plate cells

• Synapse Specification:

  • Analyze co-localization with synaptic markers

  • Distinguish pre- vs. post-synaptic localization

  • Examine relationship to other synaptic cell adhesion molecules

  • Investigate synapse maturation in various brain regions

• Functional Perturbation:

  • Use blocking antibodies to disrupt Nectin-3 interactions during development

  • Assess consequences for:

    • Neuronal migration

    • Dendrite development

    • Synapse formation and stability

    • Circuit function

• Disease Models:

  • Compare Nectin-3 expression and localization in:

    • Neurodevelopmental disorder models

    • Neuropsychiatric conditions

    • Neurodegenerative diseases

  • Correlate alterations with functional or structural abnormalities

• Interaction with Guidance Systems:

  • Investigate how Nectin-3 coordinates with other guidance systems

  • Examine relationship to semaphorins, ephrins, and neurotrophins

  • Analyze downstream signaling pathways activated by Nectin-3 engagement

These applications can reveal how Nectin-3-mediated adhesion contributes to the precision of neural circuit assembly and function, with implications for both normal development and neurological disorders .

How can Nectin-3 antibodies be integrated with advanced imaging technologies?

Integration of Nectin-3 antibodies with cutting-edge imaging offers powerful new research capabilities:

• Expansion Microscopy:

  • Physically expand specimens while maintaining antibody labeling

  • Achieve super-resolution imaging on conventional microscopes

  • Resolve nanoscale organization of Nectin-3 at cell junctions

  • Particularly valuable for densely packed neural synapses

• Correlative Light and Electron Microscopy (CLEM):

  • Combine immunofluorescence with ultrastructural analysis

  • Precisely localize Nectin-3 within cellular ultrastructure

  • Examine molecular organization at specialized junctions:

    • Ectoplasmic specializations in testis

    • Synaptic junctions in neurons

    • Adherens junctions in epithelia

• Lattice Light-Sheet Microscopy:

  • Perform gentle, high-speed 3D imaging of living samples

  • Track Nectin-3-labeled structures over time with minimal phototoxicity

  • Study dynamics of junction formation with unprecedented detail

  • Combine with fluorescent protein fusions for multicolor analysis

• Multiplexed Imaging:

  • Use cyclic immunofluorescence or mass cytometry

  • Simultaneously visualize Nectin-3 with dozens of other markers

  • Map complex protein networks at cell junctions

  • Assess heterogeneity across different cell populations

• Tissue Clearing Techniques:

  • Apply CLARITY, iDISCO, or other clearing methods

  • Perform whole-organ or whole-embryo Nectin-3 mapping

  • Visualize global distribution patterns in 3D

  • Track developmental changes across entire tissues

These integrative approaches can reveal new insights into Nectin-3 biology that would be unattainable with conventional imaging alone .

What are the considerations for using Nectin-3 antibodies in high-throughput screening approaches?

Adapting Nectin-3 antibodies for high-throughput applications requires:

• Assay Miniaturization:

  • Optimize antibody concentrations for microplate formats

  • Develop automated staining protocols

  • Balance sensitivity and specificity in reduced volumes

  • Consider using higher-affinity monoclonal antibodies

• Multiplexed Detection:

  • Combine Nectin-3 antibodies with other markers

  • Use spectrally distinct fluorophores or barcoding strategies

  • Develop multiplex ELISA or protein array formats

  • Design panels that include related junction proteins

• Automated Image Analysis:

  • Develop algorithms for Nectin-3 junction quantification

  • Measure parameters like:

    • Junction length and continuity

    • Signal intensity and distribution

    • Co-localization with binding partners

    • Morphological features of labeled structures

• Validation Strategies:

  • Include positive and negative controls on every plate

  • Use blocking peptides as specificity controls

  • Implement robust statistical analyses for hit identification

  • Confirm hits with orthogonal assays

• Screening Applications:

  • Drug discovery targeting Nectin-3 interactions

  • Genetic screens for junction regulators

  • Pathogen entry mechanism studies

  • Cell adhesion modulators in development and disease

By addressing these considerations, researchers can develop reliable high-throughput assays for studying Nectin-3 biology across large sample sets or compound libraries .

How can Nectin-3 antibodies contribute to understanding disease mechanisms?

Nectin-3 antibodies provide valuable tools for investigating disease processes:

• Cancer Research:

  • Analyze Nectin-3 expression in tumor samples via IHC

  • Human prostate cancer tissue has shown positive staining

  • Investigate correlation with:

    • Tumor grade and stage

    • Invasiveness and metastatic potential

    • Patient outcomes

  • Study Nectin-3's role in tumor cell adhesion and migration

• Reproductive Disorders:

  • Examine Nectin-3 in male infertility models

  • Investigate junction integrity in Sertoli-spermatid connections

  • Antibody 103-A1 disrupts actin filaments at these junctions when injected into seminiferous tubules

  • Correlate Nectin-3 abnormalities with spermatogenic defects

• Neurodevelopmental and Psychiatric Disorders:

  • Compare Nectin-3 distribution in postmortem brain tissues

  • Analyze synapse organization and density

  • Investigate Nectin-3's role in circuit formation and maintenance

  • Assess effects of disease-associated mutations

• Viral Pathogenesis:

  • Study Nectin-3's interaction with viral proteins

  • Investigate its potential role as viral entry receptor

  • Analyze changes in Nectin-3 distribution following infection

  • Develop blocking strategies for therapeutic applications

• Tissue-Specific Pathologies:

  • Examine Nectin-3 in ciliary body morphology disorders

  • Investigate auditory epithelium patterning defects

  • Study junction integrity in epithelial barrier dysfunction

  • Analyze vascular junction abnormalities

These applications can identify new disease mechanisms and potential therapeutic targets across multiple clinical domains .