AUG2 Antibody

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Description

Biological Context of the AUG2 Antigen

The AUG2 antigen (historically termed At<sup>a</sup>) is a high-prevalence antigen encoded by the SLC29A1 gene, which produces the equilibrative nucleoside transporter ENT1 . ENT1 facilitates nucleoside transport across cell membranes and is expressed in nearly all human tissues, including red blood cells (RBCs) . The AUG2 antigen arises from a single nucleotide polymorphism (c.1171G>A) in exon 12 of SLC29A1, resulting in a glutamic acid-to-lysine substitution at position 391 (p.Glu391Lys) .

Clinical Relevance of AUG2 Antibodies

AUG2 antibodies are implicated in:

  • Hemolytic Transfusion Reactions (HTRs): Anti-AUG2 has caused both immediate and delayed HTRs. A severe delayed HTR occurred after transfusion of multiple AUG:2-positive RBC units, necessitating antigen-negative blood for future transfusions .

  • Pregnancy Complications: While anti-AUG2 has not been linked to severe hemolytic disease of the fetus and newborn (HDFN), one case of mild HDFN required phototherapy . In contrast, anti-AUG3 (a low-prevalence antigen in the same system) caused severe HDFN .

Immunological and Hematological Challenges

  • Antigen-Negative Blood Scarcity: The At(a–) phenotype (AUG:–2) is extremely rare, complicating the procurement of compatible blood for sensitized patients .

  • Red Cell Abnormalities: AUG<sub>null</sub> individuals (lacking all AUG antigens) exhibit misshapen RBCs with deregulated protein phosphorylation but no anemia .

Key Research Findings

  • In Vivo Destruction of RBCs: Anti-AUG2 accelerates the clearance of antigen-positive RBCs, as demonstrated by <sup>51</sup>Cr-labelled cell studies .

  • Functional Assays: Anti-AUG2 shows reactivity in monocyte monolayer assays and antibody-dependent cellular cytotoxicity (ADCC) tests, confirming its pathogenicity .

Future Research Directions

  • Epidemiological Studies: Further investigation into the prevalence of AUG2 antibodies in diverse populations.

  • Therapeutic Strategies: Development of synthetic antigen-negative blood products or gene-editing approaches to mitigate transfusion challenges.

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
AUG2 antibody; At2g32980 antibody; T21L14.8 antibody; AUGMIN subunit 2 antibody
Target Names
AUG2
Uniprot No.

Target Background

Function
This antibody targets AUG2, a protein that plays a crucial role in the assembly of acentrosomal spindle and phragmoplast microtubule arrays as part of the augmin complex.
Database Links

KEGG: ath:AT2G32980

STRING: 3702.AT2G32980.1

UniGene: At.12478

Protein Families
HAUS2 family

Q&A

What is AGR2 and why is it a significant target for antibody development?

AGR2 (Anterior Gradient Protein 2) is a secreted protein that plays important roles in cell migration, differentiation, and proliferation. Its significance as a research target stems from its overexpression in various cancer types, particularly in breast, lung, prostate, and pancreatic cancers. AGR2 has been implicated in tumor growth, cancer cell survival, and metastasis, making antibodies against it valuable tools for both basic cancer biology research and potential therapeutic development. AGR2 antibodies allow researchers to detect its expression in different tissue types, including localization to the plasma membrane in cancer cells . The protein's involvement in multiple cancer-related pathways makes it an important biomarker and potential therapeutic target.

What are the most common applications for AGR2 antibodies in research?

AGR2 antibodies are employed in numerous research applications, primarily:

  • Western blotting: For detecting AGR2 protein in cell and tissue lysates, such as A549 human lung carcinoma cells and human small intestine tissue

  • Immunohistochemistry: For examining AGR2 expression patterns in paraffin-embedded tissues, particularly in cancer specimens

  • Flow cytometry: For analyzing AGR2 expression in cell populations

  • Immunoprecipitation: For isolating AGR2 protein complexes

  • ELISA: For quantitative measurement of AGR2 in biological samples

  • Cancer biomarker studies: For evaluating AGR2's potential as a diagnostic or prognostic marker

The versatility of AGR2 antibodies across these applications makes them essential tools for researchers investigating cancer biology, cellular signaling, and biomarker development.

What types of AGR2 antibodies are available for research applications?

Several types of AGR2 antibodies are available for research, each with specific advantages depending on the experimental context:

  • Polyclonal antibodies: These recognize multiple epitopes on AGR2, such as the Sheep Anti-Human AGR2 Antigen Affinity-purified Polyclonal Antibody . They often provide high sensitivity but may have more cross-reactivity.

  • Monoclonal antibodies: These recognize a single epitope on AGR2, offering high specificity for particular applications.

  • Recombinant antibodies: Engineered for consistent performance across batches.

  • Antibody fragments: Including Fab, scFv, and nanobodies for specialized applications requiring smaller binding molecules.

  • Conjugated antibodies: Directly labeled with fluorophores, enzymes, or other detection molecules for specialized applications.

The choice between these antibody types depends on the specific research question, required sensitivity and specificity, and experimental technique being employed.

How can I validate AGR2 antibody specificity for my particular cancer model?

Validating antibody specificity is crucial for ensuring reliable research outcomes. For AGR2 antibodies, a comprehensive validation approach should include:

  • Positive and negative controls: Use cell lines or tissues known to express or lack AGR2 expression. A549 human lung carcinoma cells and human small intestine tissue are documented positive controls .

  • Multiple detection methods: Compare results across Western blot, IHC, and other methods to ensure consistent detection patterns.

  • Knockdown/knockout validation: Use AGR2 siRNA knockdown or CRISPR knockout models to confirm antibody specificity. Reduced signal after AGR2 depletion strongly supports antibody specificity.

  • Peptide competition assays: Pre-incubate the antibody with purified AGR2 protein or peptide before application to samples. Signal reduction confirms specificity.

  • Cross-reactivity testing: Test against related proteins (e.g., AGR3) to ensure the antibody doesn't recognize close homologs unless designed to do so.

  • Reproducibility assessment: Compare results across different lots of the same antibody and between different antibodies targeting distinct AGR2 epitopes.

This multi-faceted approach ensures that observed signals truly represent AGR2 rather than non-specific binding or cross-reactivity, which is particularly important in complex cancer models where many proteins may be dysregulated.

What are the considerations for developing immune complex (IC) assays for detecting anti-AGR2 antibodies in patient samples?

Developing IC assays for detecting anti-AGR2 antibodies in patient samples requires careful methodological considerations:

  • Assay format optimization: Similar to anti-AAV2 antibody detection , an IC assay for AGR2 would involve forming immune complexes in solution with optimized concentrations of AGR2 protein, followed by capture and detection of these complexes.

  • Reagent consumption efficiency: A key advantage of IC assays is their lower antigen consumption compared to direct ELISA formats. This efficiency is particularly important when working with limited quantities of purified AGR2 protein .

  • Sensitivity calibration: Determine the minimum detectable concentration of anti-AGR2 antibodies by testing serial dilutions of positive control samples, as sensitivity may differ from direct ELISA methods .

  • Specificity controls: Include parallel analysis of samples without spiked AGR2 to provide intrinsic specificity control, eliminating the need for separate confirmatory steps .

  • Isotype detection versatility: Consider modifying the detection antibody to target different immunoglobulin isotypes (IgG, IgM, IgA) for comprehensive characterization of humoral responses .

  • Cross-validation: Compare results with established methods like direct ELISA to ensure concordant findings, acknowledging potential sensitivity differences at early timepoints .

This approach provides a resource-efficient method for detecting anti-AGR2 antibodies in patient samples, potentially enabling more frequent immunogenicity assessments in clinical studies.

How does AGR2 antibody perform in detecting membrane-associated versus secreted forms of the protein?

AGR2 exists in both membrane-associated and secreted forms, presenting distinct detection challenges:

  • Membrane-associated AGR2:

    • Effectively detected using immunohistochemistry on fixed tissues, as demonstrated in human breast cancer tissue where specific staining was localized to the plasma membrane of cancer cells

    • Requires proper membrane protein extraction protocols for Western blot analysis

    • May benefit from non-permeabilizing flow cytometry for surface detection

  • Secreted AGR2:

    • Best detected in conditioned media or biological fluids using ELISA or similar assays

    • Requires concentration steps for Western blot analysis due to dilution in media

    • May require different antibodies optimized for recognition in solution versus fixed contexts

  • Distinguishing factors:

    • Post-translational modifications may differ between secreted and membrane-associated forms

    • Conformation changes may affect epitope accessibility

    • Context-dependent sensitivity varies between detection methods

  • Validation approaches:

    • Subcellular fractionation to separate membrane and soluble fractions

    • Comparing detection in cell lysates versus conditioned media

    • Using signal peptide mutants that alter AGR2 secretion

Understanding these distinctions is crucial for accurate interpretation of experimental results, particularly in cancer studies where altered AGR2 localization may have functional significance.

What are the optimal conditions for using AGR2 antibodies in Western blot applications?

Optimizing Western blot conditions for AGR2 detection requires attention to several critical parameters:

  • Sample preparation:

    • Use appropriate lysis buffers compatible with membrane protein extraction

    • For A549 cells and small intestine tissue, reducing conditions are recommended

    • Employ Immunoblot Buffer Group 8 or equivalent for optimal results

  • Gel and transfer parameters:

    • SDS-PAGE with 12-15% gels typically provides good resolution for AGR2 (approximately 20 kDa)

    • PVDF membranes are recommended for optimal protein binding and signal-to-noise ratio

    • Semi-dry or wet transfer methods are both suitable with optimized transfer times

  • Antibody dilution and incubation:

    • Primary antibody: 1 μg/mL of Sheep Anti-Human AG-2/AGR2 antibody or equivalent

    • Secondary antibody: HRP-conjugated Anti-Sheep IgG at manufacturer's recommended dilution

    • Overnight incubation at 4°C for primary antibody may improve specific binding

  • Detection system:

    • Enhanced chemiluminescence (ECL) provides sensitive detection

    • Fluorescent secondary antibodies allow for multiplex detection and quantification

  • Expected results:

    • AGR2 appears as a specific band at approximately 20 kDa

    • Additional bands may represent post-translationally modified forms or degradation products

  • Controls:

    • Positive control: A549 human lung carcinoma cell line or human small intestine tissue

    • Loading control: Housekeeping proteins like β-actin or GAPDH to normalize expression levels

Following these optimized conditions will help ensure specific and sensitive detection of AGR2 in Western blot applications.

What are the key considerations for using AGR2 antibodies in immunohistochemistry studies?

Effective immunohistochemistry (IHC) with AGR2 antibodies requires attention to these methodological details:

  • Tissue preparation:

    • Immersion fixed, paraffin-embedded sections are suitable for AGR2 detection

    • Antigen retrieval methods may be necessary (heat-induced or enzymatic) to expose epitopes masked during fixation

    • Optimal section thickness is typically 4-6 μm

  • Antibody parameters:

    • Concentration: 10 μg/mL of Anti-Human AGR2 Antibody for overnight incubation at 4°C

    • Diluent: Use low-protein, non-reactive buffers to reduce background

    • Incubation time: Overnight at 4°C typically provides optimal staining

  • Detection system:

    • HRP-DAB (horseradish peroxidase with 3,3'-diaminobenzidine) systems provide robust brown staining

    • Counterstaining with hematoxylin provides blue nuclear contrast

    • Fluorescent secondary antibodies can be used for multiplex staining

  • Controls and validation:

    • Positive control: Human breast cancer tissue shows specific plasma membrane staining in cancer cells

    • Negative controls: Primary antibody omission and isotype controls

    • Peptide competition can confirm specificity

  • Interpretation guidelines:

    • Membrane localization is expected in cancer cells

    • Cytoplasmic staining may also be observed depending on cancer type and fixation

    • Quantification methods should be standardized (H-score, percentage positive cells, etc.)

  • Multiplex considerations:

    • For co-localization studies, select antibodies from different host species

    • Sequential staining may be necessary for antibodies from the same species

Following these guidelines will help ensure reliable and reproducible AGR2 detection in tissue sections for diagnostic and research applications.

How can I develop a quantitative ELISA for measuring AGR2 levels in biological samples?

Developing a quantitative ELISA for AGR2 requires systematic optimization of multiple parameters:

  • Assay format selection:

    • Sandwich ELISA: Utilizes two antibodies recognizing different AGR2 epitopes

    • Direct ELISA: Simpler but may have lower specificity

    • Competitive ELISA: Useful for small samples or low concentrations

  • Reagent optimization:

    • Capture antibody: 1-5 μg/mL coating concentration, optimized through titration

    • Detection antibody: Biotinylated or enzyme-conjugated, titrated for optimal signal-to-noise ratio

    • Antigen standard: Recombinant human AGR2 for standard curve (0.1-1000 ng/mL range)

  • Protocol development:

    • Coating buffer: Carbonate/bicarbonate buffer (pH 9.6) or PBS

    • Blocking: 1-5% BSA or similar to minimize non-specific binding

    • Sample dilution: Determine optimal dilution through spike-recovery experiments

    • Incubation times: Typically 1-2 hours at room temperature or overnight at 4°C

  • Validation parameters:

    • Limit of detection (LOD) and limit of quantification (LOQ)

    • Linearity within the quantifiable range

    • Precision: Intra-assay and inter-assay coefficients of variation (<15%)

    • Accuracy: Spike-recovery experiments (80-120% recovery)

    • Specificity: Cross-reactivity testing with related proteins (e.g., AGR3)

  • Sample considerations:

    • Serum/plasma: May require special handling to manage matrix effects

    • Tissue lysates: Standardize extraction method and normalize to total protein

    • Cell culture supernatants: Consider concentration for low-abundance samples

  • Data analysis:

    • Standard curve fitting: Four-parameter logistic regression recommended

    • Software: GraphPad Prism, SoftMax Pro, or similar for robust analysis

This approach, drawing from principles similar to those used for antibody detection ELISAs , provides a framework for developing a sensitive and specific quantitative assay for AGR2 measurement.

Why might I observe inconsistent AGR2 detection across different experimental systems, and how can I address this?

Inconsistent AGR2 detection across experimental systems can stem from multiple factors:

  • Biological variability in AGR2 expression:

    • Cell-type dependent expression patterns

    • Culture conditions affecting expression levels

    • Passage number influence on cancer cell lines

    • Solution: Include well-characterized positive controls like A549 cells in each experiment; standardize culture conditions

  • Antibody-related factors:

    • Lot-to-lot variability in antibody performance

    • Degradation of antibody during storage

    • Different epitope accessibility across experimental contexts

    • Solution: Validate each new antibody lot; store antibodies according to manufacturer recommendations; consider using multiple antibodies targeting different epitopes

  • Technical variations:

    • Differences in protein extraction methods affecting yield

    • Variability in transfer efficiency for Western blots

    • Inconsistent fixation and antigen retrieval for IHC

    • Solution: Standardize protocols across experiments; use internal controls for normalization

  • Post-translational modifications:

    • Glycosylation or phosphorylation affecting epitope recognition

    • Protein cleavage or degradation

    • Solution: Use multiple antibodies recognizing different regions; include denaturing agents when appropriate

  • Quantification challenges:

    • Different dynamic ranges across detection methods

    • Non-linear relationship between signal and protein quantity

    • Solution: Establish standard curves; use digital image analysis for quantification

  • Cross-platform comparison issues:

    • Fundamental differences between methods (IHC vs. Western blot vs. ELISA)

    • Solution: Understand the limitations of each method; integrate data from multiple approaches

By systematically addressing these factors and implementing standardized workflows, researchers can achieve more consistent AGR2 detection across experimental systems.

How can I distinguish between different isoforms or post-translationally modified forms of AGR2 using antibody-based approaches?

Distinguishing between AGR2 isoforms and post-translationally modified forms requires strategic antibody selection and specialized techniques:

  • Isoform-specific detection approaches:

    • Epitope-specific antibodies targeting unique regions of each isoform

    • RT-PCR validation alongside antibody detection to confirm isoform identity

    • 2D gel electrophoresis followed by Western blotting to separate isoforms by both size and charge

    • Mass spectrometry validation of immunoprecipitated proteins

  • Post-translational modification (PTM) analysis:

    • Modification-specific antibodies (e.g., anti-phospho-AGR2, anti-glycosylated-AGR2)

    • Enzymatic treatments before detection:

      • Phosphatase treatment to remove phosphorylation

      • Glycosidase treatment to remove glycosylation

      • Comparison of migration patterns before and after treatment

    • Phos-tag acrylamide gels to separate phosphorylated from non-phosphorylated forms

  • Combined enrichment strategies:

    • Sequential immunoprecipitation with different antibodies

    • Enrichment of modified proteins followed by AGR2-specific detection

    • Subcellular fractionation to separate compartment-specific forms

  • Advanced analytical techniques:

    • Super-resolution microscopy for co-localization studies

    • Proximity ligation assays to detect specific AGR2 interaction partners

    • FRET-based approaches to assess conformational changes

  • Data integration framework:

    • Correlation of antibody-based detection with mass spectrometry data

    • Integration with transcriptomic data on isoform expression

    • Computational modeling of potential modification sites

This comprehensive approach allows researchers to move beyond simple detection of AGR2 to understand the complex landscape of isoforms and modifications that may have distinct biological functions in normal and pathological contexts.

What are the best approaches for analyzing and interpreting AGR2 antibody data in the context of cancer biomarker research?

Analyzing AGR2 antibody data for cancer biomarker applications requires rigorous methodological and statistical approaches:

  • Quantification standardization:

    • For IHC: Use validated scoring systems (H-score, Allred score, or digital image analysis)

    • For Western blot: Normalize to loading controls and use density quantification

    • For ELISA: Employ standard curves with appropriate curve-fitting algorithms

  • Clinical correlation analysis:

    • Match AGR2 expression with patient clinicopathological data

    • Perform survival analysis (Kaplan-Meier, Cox regression)

    • Evaluate correlation with established biomarkers or molecular subtypes

    • Assess relationship to treatment response metrics

  • Statistical considerations:

    • Determine appropriate sample sizes through power analysis

    • Apply multiple testing corrections for high-dimensional data

    • Use appropriate statistical tests based on data distribution

    • Implement machine learning approaches for complex pattern recognition, similar to antibody-antigen binding prediction models

  • Multi-marker integration:

    • Combine AGR2 with other biomarkers for improved predictive power

    • Develop composite scoring systems incorporating multiple markers

    • Use multivariate analysis to identify independent prognostic value

  • Validation frameworks:

    • Internal validation: Cross-validation within dataset

    • External validation: Testing in independent patient cohorts

    • Analytical validation: Reproducibility across laboratories and platforms

  • Reporting standards:

    • Follow REMARK guidelines for biomarker studies

    • Include detailed methodological reporting for reproducibility

    • Provide access to raw data when possible

  • Biological interpretation:

    • Connect expression patterns to known AGR2 biological functions

    • Consider subcellular localization (membrane vs. cytoplasmic)

    • Interpret in the context of relevant signaling pathways

This structured approach enhances the rigor and reproducibility of AGR2 biomarker research, addressing the challenges of translating antibody-based detection into clinically meaningful information.

How can machine learning approaches improve the application of AGR2 antibodies in research and diagnostics?

Machine learning is revolutionizing antibody research, with several promising applications for AGR2 antibodies:

  • Epitope prediction and antibody design:

    • Computational prediction of optimal AGR2 epitopes for antibody development

    • Structure-based modeling to design antibodies with improved specificity and affinity

    • Machine learning algorithms can analyze library-on-library data to predict AGR2-antibody binding patterns

  • Image analysis for IHC:

    • Automated detection and quantification of AGR2 staining in tissue sections

    • Deep learning algorithms for cell-type specific expression analysis

    • Convolutional neural networks for pattern recognition in complex tissues

  • Signal optimization in detection assays:

    • Predictive models for optimal antibody concentrations and incubation conditions

    • Algorithms to distinguish specific signal from background noise

    • Automated troubleshooting recommendations based on pattern recognition

  • Multiparameter data integration:

    • Integration of AGR2 antibody data with other -omics datasets

    • Pathway analysis incorporating AGR2 expression patterns

    • Patient stratification based on AGR2 and related biomarkers

  • Addressing out-of-distribution challenges:

    • Active learning approaches to improve prediction of AGR2 antibody binding to new variants

    • Transfer learning from related antibody-antigen interactions

    • Uncertainty quantification to identify low-confidence predictions

  • Automation of assay development:

    • Computational optimization of immune complex assay parameters

    • Design of experiments (DoE) approaches to minimize antibody consumption

    • Predictive maintenance for laboratory equipment based on quality control data

These machine learning approaches can potentially overcome current limitations in antibody research, addressing challenges similar to those faced in out-of-distribution predictions for antibody-antigen binding , while improving reproducibility and accelerating discovery.

What are the emerging applications of AGR2 antibodies in therapeutic development and targeted drug delivery?

AGR2 antibodies are increasingly being explored for therapeutic applications beyond their traditional research and diagnostic uses:

  • Antibody-drug conjugates (ADCs):

    • Conjugation of cytotoxic payloads to AGR2-targeting antibodies

    • Selective delivery to AGR2-overexpressing cancer cells

    • Optimization of linker chemistry for appropriate drug release kinetics

    • Potential for reducing off-target toxicity in cancer treatment

  • Immune checkpoint modulation:

    • Exploration of AGR2's potential role in immune evasion

    • Development of bispecific antibodies targeting both AGR2 and immune checkpoints

    • Enhancement of anti-tumor immune responses through AGR2 blockade

  • CAR-T cell therapy:

    • Engineering T cells with chimeric antigen receptors targeting AGR2

    • Potential for solid tumor targeting given AGR2's membrane localization in cancer cells

    • Development of safety switches to manage potential toxicity

  • Nanoparticle-based delivery systems:

    • Functionalization of nanoparticles with AGR2 antibodies

    • Targeted delivery of therapeutic payloads (siRNA, CRISPR-Cas9, small molecules)

    • Multimodal approaches combining imaging and therapeutic capabilities

  • Antibody fragments and alternatives:

    • Development of smaller binding modules (scFvs, nanobodies) against AGR2

    • Improved tissue penetration compared to full-size antibodies

    • Potential for oral or topical administration for gastrointestinal or skin cancers

  • Combination therapy approaches:

    • Synergistic targeting of AGR2 alongside standard chemotherapy

    • Rational combinations with other targeted therapies based on pathway analysis

    • Sequential treatment strategies to overcome resistance mechanisms

These emerging applications leverage the specificity of AGR2 antibodies and the overexpression of AGR2 in multiple cancer types to develop more targeted and potentially less toxic therapeutic approaches.

How might experimental approaches from other antibody fields, such as the immune complex assay developed for AAV2, be applied to AGR2 antibody research?

Innovative experimental approaches from other antibody fields can be adapted to advance AGR2 antibody research:

  • Immune complex (IC) assay adaptation:

    • Modification of the AAV2 IC assay methodology for AGR2 antibody detection

    • Development of assays with lower AGR2 protein consumption for resource-efficient research

    • Implementation of intrinsic specificity controls for increased confidence in results

    • Application to monitoring anti-AGR2 autoantibody responses in cancer patients

  • Cross-platform validation strategies:

    • Integration of multiple detection methods similar to Caspr2 antibody validation

    • Combined use of cell-based assays, tissue immunohistochemistry, and biochemical approaches

    • Establishment of robust validation protocols for new AGR2 antibody reagents

  • IgG subclass analysis:

    • Characterization of IgG4 versus other subclasses in anti-AGR2 responses

    • Investigation of functional differences between antibody subclasses

    • Potential correlations between antibody subclass and biological outcomes

  • Drug tolerance optimization:

    • Adaptation of drug-tolerant assay formats for detecting antibodies in the presence of therapeutic AGR2-targeting agents

    • Development of bridging assays that can detect antibodies regardless of their bound state

  • High-throughput screening approaches:

    • Library-on-library methodologies for mapping AGR2 epitopes

    • Machine learning integration for predicting optimal antibody-antigen pairings

    • Active learning frameworks to iteratively improve assay performance with minimal experimental effort

  • Multiplexed detection systems:

    • Simultaneous detection of AGR2 alongside other cancer biomarkers

    • Development of antibody panels for comprehensive cancer profiling

    • Integration with mass cytometry or similar high-dimensional approaches

By thoughtfully adapting these innovative approaches from adjacent fields, researchers can accelerate AGR2 antibody research, improve assay performance, and develop more efficient experimental workflows, ultimately enhancing our understanding of AGR2's role in cancer biology.

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