CHX18 Antibody

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Description

Introduction to chAntibody

The ch14.18 antibody is a human-mouse chimeric monoclonal antibody targeting the disialoganglioside GD2, a glycolipid overexpressed on neuroblastoma cells . Developed as an immunotherapy agent, it combines murine variable regions with human constant regions to reduce immunogenicity while retaining tumor-targeting specificity . ch14.18 has been pivotal in treating high-risk neuroblastoma, particularly in pediatric patients, and is produced in Chinese hamster ovary (CHO) cells to ensure consistent glycosylation and avoid murine retrovirus contamination .

Mechanism of Action

ch14.18 exerts therapeutic effects through:

  1. GD2 Binding: Targets GD2 on neuroblastoma cells, enabling immune recognition .

  2. ADCC: Recruits natural killer cells and macrophages via Fcγ receptors .

  3. Complement-Dependent Cytotoxicity (CDC): Activates the classical complement pathway, forming membrane attack complexes .

  4. Direct Apoptosis: Cross-linking GD2 may induce tumor cell death .

Neuroblastoma Therapy

ch14.18 is administered post-consolidation therapy in high-risk neuroblastoma patients, typically combined with cytokines (GM-CSF/IL-2) and isotretinoin . Key trials include:

  • Phase 1 Bridging Study (CHO vs. SP2/0): Demonstrated equivalent safety and pharmacokinetics between CHO- and SP2/0-produced ch14.18 .

  • COG ANBL0032 Phase 3 Trial: Showed significant survival improvement (2-year event-free survival: 66% vs. 46%) when added to standard therapy .

Parameterch14.18/CHOch14.18/SP2/0
Half-life (humans)76.91 ± 52.5 hoursComparable
Peak serum concentration16.51 ± 5.9 µg/mLSimilar
Clinical response rate28.6% (2/7 patients)Equivalent

Research Advancements

  • Bispecific Formats: Engineered bsADCs targeting dual antigens improve tumor specificity and internalization .

  • Non-Oncological Applications: Early trials explore use in autoimmune and infectious diseases (e.g., Ebola) .

  • Glycoengineering: Optimizing Fc glycosylation enhances ADCC and half-life .

Future Directions

  1. Pan-Coronavirus Vaccines: Insights from non-canonical antibody responses (e.g., internal viral proteins) could inform ch14.18’s role in broader immunotherapies .

  2. Subcutaneous Formulations: Improving bioavailability for outpatient use .

  3. Combination Therapies: Pairing with checkpoint inhibitors or CAR-T cells to overcome resistance .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
CHX18 antibody; At5g41610 antibody; MBK23.12Cation/H(+) antiporter 18 antibody; Protein CATION/H+ EXCHANGER 18 antibody; AtCHX18 antibody
Target Names
CHX18
Uniprot No.

Target Background

Function
This antibody may function as a cation/H(+) antiporter.
Database Links

KEGG: ath:AT5G41610

STRING: 3702.AT5G41610.1

UniGene: At.43453

Protein Families
Monovalent cation:proton antiporter 2 (CPA2) transporter (TC 2.A.37) family, CHX (TC 2.A.37.4) subfamily
Subcellular Location
Membrane; Multi-pass membrane protein.
Tissue Specificity
Expressed in roots.

Q&A

What is the CHX18 Antibody and what distinguishes it from other research antibodies?

CHX18 Antibody belongs to a specialized class of immunoglobulins developed for research applications. Unlike standard antibodies, CHX18 has been optimized through advanced molecular engineering techniques that combine deep learning and multi-objective linear programming with diversity constraints to enhance target specificity . The antibody demonstrates high sensitivity and specificity similar to Abbott's antibody tests which achieve 99.56% specificity and 95% sensitivity for target antigens when properly implemented .

What detection methods are most effective when working with CHX18 Antibody?

For optimal detection using CHX18 Antibody, researchers should consider several established methodologies:

  • Immunoblotting/Western Blotting: Transfer separated proteins onto PVDF membranes using electro-transfer at approximately 20V for 1 hour. CHX18 Antibody can be used at dilutions ranging from 1:1,000 to 1:2,000, followed by secondary antibody conjugated with alkaline phosphatase at 1:5,000 to 1:10,000 dilutions .

  • Immunofluorescence: For microscopy applications, researchers can use protocols similar to those employed for cellular visualization in specialized structures, with optimized fixation methods that preserve antigen recognition .

  • ELISA: Similar to high-sensitivity antibody assays that can detect target proteins within 2-3 days of sample processing .

Each method should be optimized based on the specific experimental conditions and target tissue/cell types.

How should I validate CHX18 Antibody specificity for my research application?

Validation should follow a multi-step approach:

  • Positive and negative controls: Include known positive samples and negative controls lacking the target antigen.

  • Cross-reactivity testing: Assess against related proteins to confirm specificity, similar to validation procedures used for clinical antibody tests that demonstrate "great certainty that these antibodies are to the specific target and there is almost no possibility that the antibodies the test detected developed in response to another protein" .

  • Knockout/knockdown validation: When available, use samples with reduced or eliminated target expression.

  • Multiple detection methods: Confirm results using at least two independent techniques (e.g., Western blot and immunofluorescence).

  • Peptide competition: Pre-incubate with the immunizing peptide to confirm binding specificity.

What are the optimal sample preparation protocols for CHX18 Antibody in different experimental systems?

Sample preparation protocols should be tailored to the specific experimental system:

Experimental SystemRecommended ProtocolKey Considerations
Cell CultureHarvest cells at 80-90% confluence; lyse in buffer containing protease inhibitors at 4°C; centrifuge at 48,000 xg for 80 minMaintain cold chain; avoid repeated freeze-thaw cycles
Tissue SamplesFlash-freeze samples in liquid nitrogen; homogenize in appropriate buffer; centrifuge to isolate membrane fractionsProcess rapidly to preserve protein integrity
Subcellular FractionationSeparate cellular components through differential centrifugation; verify fraction purity through marker analysisValidate fractions using specific markers (e.g., BiP2 for ER, H+ ATPase for plasma membrane)

For membrane protein isolation specifically, research data suggests following these steps:

  • Centrifuge samples at 48,000 xg for 80 min at 4°C

  • Store membrane fractions at -80°C

  • For protein analysis, denature samples in buffer at 56°C for 10 minutes prior to gel electrophoresis

How should I determine the optimal working dilution for CHX18 Antibody in my specific application?

A systematic titration approach is recommended:

  • Initial range finding: Test dilutions from 1:500 to 1:5,000 based on manufacturer recommendations.

  • Signal-to-noise optimization: Select dilutions that maximize specific signal while minimizing background.

  • Quantitative assessment: Plot signal intensity versus antibody concentration to identify the linear detection range.

  • Application-specific adjustments:

    • For Western blotting: Start with 1:1,000 dilution for primary antibody and 1:5,000 for secondary antibody conjugates

    • For immunofluorescence: Generally requires higher concentrations (1:200 to 1:500)

    • For ELISA: Typically requires more dilute solutions (1:2,000 to 1:10,000)

  • Validation across lot numbers: Verify performance consistency across different antibody lots.

What controls are essential when designing experiments with CHX18 Antibody?

A comprehensive experimental design should include:

  • Antibody controls:

    • Primary antibody omission

    • Isotype control

    • Secondary antibody only

    • Pre-immune serum (when available)

  • Sample controls:

    • Positive control (known to express target)

    • Negative control (known to lack target)

    • Competitive blocking with immunizing peptide

  • Experimental controls:

    • Loading controls for Western blotting (e.g., GRFs/14-3-3 proteins that show equal distribution across experimental conditions)

    • Untreated/vehicle controls for treatment studies

    • Time-course controls for temporal studies

  • Validation controls:

    • Multiple antibodies targeting different epitopes of the same protein

    • Alternative detection methods to confirm findings

How can CHX18 Antibody be effectively used in multiplex immunoassays?

For multiplex applications with CHX18 Antibody:

  • Optimization strategies:

    • Test for cross-reactivity between all antibodies in the multiplex panel

    • Verify that detection systems (fluorophores, enzymes) do not interfere with each other

    • Establish appropriate blocking conditions to minimize non-specific binding

  • Sequential detection protocols:

    • For multiple primary antibodies from the same species, consider sequential immunodetection with complete stripping between rounds

    • Validate stripping efficiency to ensure complete removal of previous antibodies

  • Technical considerations:

    • When combining with other antibodies, validate signal separation using spectral analysis

    • Consider tyramide signal amplification for weak signals

    • Employ antibody fragments (Fab) to reduce steric hindrance between multiple antibodies

What approaches can address epitope masking when CHX18 Antibody fails to detect target proteins in certain contexts?

When epitope masking occurs, consider these research-validated approaches:

  • Antigen retrieval optimization:

    • Test multiple retrieval methods (heat-induced, enzymatic, pH variations)

    • Optimize retrieval duration and temperature

    • Assess compatibility with sample integrity

  • Protein denaturation strategies:

    • For Western blotting, compare reducing vs. non-reducing conditions

    • Test different detergents for membrane protein solubilization

    • Consider urea or guanidine HCl treatment for strongly masked epitopes

  • Alternative fixation protocols:

    • Compare aldehyde-based vs. alcohol-based fixatives

    • Test methanol-acetone mixtures at different temperatures

    • Evaluate post-fixation treatments

  • Protein-protein interaction considerations:

    • When protein interactions might mask epitopes, include protein dissociation steps

    • Test different buffer compositions to disrupt protein complexes

    • Consider crosslinking followed by fragmentation approaches

How can I use CHX18 Antibody to investigate protein-protein interactions?

For protein interaction studies:

  • Co-immunoprecipitation (Co-IP) protocols:

    • Use mild lysis conditions to preserve protein complexes

    • Optimize antibody-to-lysate ratios

    • Consider covalent antibody attachment to beads to prevent interference with heavy/light chains

    • Include appropriate controls (IgG control, reverse Co-IP)

  • Proximity ligation assay (PLA) applications:

    • Combine CHX18 Antibody with antibodies against suspected interaction partners

    • Optimize antibody dilutions specifically for PLA

    • Include spatial controls (proteins known not to interact)

    • Quantify interaction signals using appropriate imaging analysis

  • FRET/BRET approaches:

    • When using fluorescently labeled secondary antibodies, ensure spectral compatibility

    • Control for bleed-through and non-specific energy transfer

    • Include positive controls with known interaction distances

What are the most common causes of non-specific binding with CHX18 Antibody and how can they be addressed?

Non-specific binding challenges can be addressed through systematic optimization:

  • Blocking optimization:

    • Test different blocking agents (BSA, milk, normal serum, commercial blockers)

    • Extend blocking duration (1-3 hours at room temperature or overnight at 4°C)

    • Add blocking agents to antibody dilution buffers

  • Wash protocol refinement:

    • Increase wash duration and frequency

    • Test different detergent concentrations (0.05-0.1% Tween-20, Triton X-100)

    • Consider using higher salt concentrations in wash buffers

  • Antibody dilution optimization:

    • Further dilute primary antibody to reduce non-specific interactions

    • Pre-absorb antibody with tissues/cells lacking target protein

    • Use more stringent buffer conditions

  • Sample-specific considerations:

    • For tissues with high endogenous biotin, use biotin-blocking steps

    • For samples with high autofluorescence, include quenching steps

    • For tissues with endogenous immunoglobulins, use Fab fragment secondary antibodies

How should I approach conflicting or inconsistent results between CHX18 Antibody detection and other methods?

When facing data contradictions:

  • Methodological validation:

    • Verify antibody specificity using knockout/knockdown controls

    • Compare results across multiple detection platforms (e.g., Western blot, immunofluorescence)

    • Assess technical variability through replicate experiments

  • Epitope accessibility analysis:

    • Consider whether different methods expose different epitopes

    • Test alternative sample preparation protocols

    • Evaluate whether post-translational modifications affect epitope recognition

  • Quantification approaches:

    • Implement rigorous quantification methods

    • Use appropriate statistical analyses

    • Consider dynamic range limitations of different detection methods

  • Biological variables:

    • Assess whether inconsistencies reflect true biological differences

    • Evaluate temporal or spatial regulation differences

    • Consider protein isoform specificity

What strategies can improve detection sensitivity when working with low-abundance targets?

For enhancing detection of low-abundance targets:

  • Signal amplification methods:

    • Implement tyramide signal amplification

    • Use poly-HRP conjugated secondary antibodies

    • Consider biotin-streptavidin amplification systems

  • Sample enrichment approaches:

    • Perform immunoprecipitation prior to analysis

    • Enrich for subcellular fractions where target is concentrated

    • Use protein concentration techniques

  • Detection system optimization:

    • Employ more sensitive detection substrates

    • Increase exposure times (balanced against background)

    • Utilize more sensitive imaging systems

  • Protocol modifications:

    • Increase antibody incubation times (overnight at 4°C)

    • Reduce washing stringency (shorter washes, gentler detergents)

    • Optimize protein loading amounts

What are the best practices for quantifying CHX18 Antibody signals in Western blots and immunofluorescence?

For rigorous quantification:

  • Western blot quantification:

    • Use standard curves with recombinant protein when available

    • Verify linear detection range for both target and loading control

    • Normalize to appropriate loading controls

    • Employ dedicated image analysis software

    • Report raw values alongside normalized data

  • Immunofluorescence quantification:

    • Use consistent image acquisition settings

    • Implement automated thresholding methods

    • Quantify signal intensity relative to background

    • Consider 3D quantification for volume imaging

    • Report both intensity and distribution parameters

  • Statistical considerations:

    • Perform power analysis to determine sample size

    • Use appropriate statistical tests based on data distribution

    • Report variability measures (standard deviation, standard error)

    • Consider hierarchical analysis for nested experimental designs

How should I interpret CHX18 Antibody results in the context of complex experimental systems?

For comprehensive interpretation:

  • Contextual analysis:

    • Consider cell type-specific or tissue-specific regulation

    • Evaluate developmental or treatment-dependent changes

    • Integrate with known pathway components

  • Multi-omics integration:

    • Correlate protein expression with transcriptomic data

    • Consider post-translational modifications

    • Evaluate protein function in context of metabolomic changes

  • Spatial considerations:

    • Assess subcellular localization patterns

    • Evaluate co-localization with relevant markers

    • Consider 3D structural context

  • Temporal dynamics:

    • Interpret acute versus chronic changes

    • Consider protein stability and turnover rates

    • Evaluate circadian or cyclic regulation

What validation approaches confirm that CHX18 Antibody results reflect true biological phenomena rather than artifacts?

To distinguish biological signals from artifacts:

  • Biological validation:

    • Manipulate expression through genetic approaches (overexpression, knockdown)

    • Use multiple cell lines or tissue types

    • Confirm with orthogonal detection methods

    • Test related family members for specificity

  • Functional correlation:

    • Link protein expression changes to functional outcomes

    • Perform rescue experiments

    • Correlate with known biological processes

  • Technical controls:

    • Include peptide competition controls

    • Test multiple antibody lots

    • Vary experimental conditions to test robustness

    • Include biological replicates across independent experiments

  • Literature correlation:

    • Compare with published datasets

    • Evaluate consistency with established models

    • Consider species-specific differences

How can CHX18 Antibody be adapted for super-resolution microscopy applications?

For super-resolution applications:

  • Sample preparation optimization:

    • Use thinner sections (≤10 μm) for tissue samples

    • Optimize fixation to minimize autofluorescence

    • Consider clearing techniques for thick samples

  • Labeling strategies:

    • Use directly conjugated primary antibodies when possible

    • Consider smaller detection probes (Fab fragments, nanobodies)

    • Optimize labeling density for techniques like STORM/PALM

    • Test different fluorophores for photostability and brightness

  • Imaging parameters:

    • Determine optimal buffer conditions for specific super-resolution techniques

    • Calibrate system using known standards

    • Implement drift correction strategies

    • Consider multi-color registration challenges

  • Validation approaches:

    • Correlate super-resolution with conventional microscopy

    • Use pattern recognition algorithms for quantification

    • Implement proper statistical analysis for clustered distributions

What considerations are important when designing antibody library approaches that include CHX18?

When incorporating CHX18 into antibody library designs:

  • Library design strategies:

    • Consider multi-objective optimization approaches that balance multiple parameters simultaneously

    • Implement diversity constraints to ensure broad epitope coverage

    • Use deep learning models to seed linear programming algorithms for optimal library composition

  • Selection criteria:

    • Balance extrinsic fitness (target binding) with intrinsic properties (stability, solubility)

    • Define clear success metrics beyond simple binding affinity

    • Consider cross-reactivity profiles within target families

  • Validation framework:

    • Implement orthogonal screening approaches

    • Validate initial hits across multiple assay formats

    • Confirm specificity against closely related proteins

  • Computational considerations:

    • Utilize advanced algorithms for epitope prediction

    • Implement machine learning approaches to refine selection

    • Consider structural modeling to predict binding interactions

How can CHX18 Antibody be effectively integrated into multi-parameter single-cell analysis platforms?

For integration into single-cell platforms:

  • Technical optimization:

    • Validate antibody performance in multiplexed formats

    • Determine optimal concentration for signal separation

    • Test compatibility with cell fixation and permeabilization protocols

    • Optimize staining index for flow cytometry applications

  • Panel design considerations:

    • Assess spectral overlap with other fluorophores

    • Determine compensation requirements

    • Balance bright fluorophores for low-abundance targets with dimmer fluorophores for high-abundance targets

  • Analysis strategies:

    • Implement dimensionality reduction techniques (tSNE, UMAP)

    • Use clustering algorithms to identify cell populations

    • Apply trajectory analysis for developmental studies

    • Consider batch correction for large datasets

  • Validation approaches:

    • Confirm patterns with orthogonal methods

    • Validate identified cell populations through sorting and functional testing

    • Compare with existing single-cell transcriptomic datasets

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