CHX-A''-DTPA (cyclohexyl-diethylenetriaminepentaacetic acid) is a bifunctional chelator critical for radiolabeling monoclonal antibodies (mAbs). It enables conjugation with radioisotopes (e.g., , ) for diagnostic imaging or targeted therapy .
Target: Mesothelin (overexpressed in mesothelioma, pancreatic, and ovarian cancers) .
Conjugate: -CHX-A''-DTPA-MORAb-009.
Results:
| Parameter | Value (H2052 Tumors) | Value (A431/K5 Tumors) |
|---|---|---|
| Tumor Uptake (%ID/g) | >25% (48h) | >15% (48h) |
| Liver/Spleen Uptake | <20% ID/g | >30% ID/g |
| Specificity | High (vs. A431 controls) | Moderate (antigen shedding) |
Target: CD73 (immunotherapy biomarker in pancreatic cancer) .
Conjugate: -CHX-A''-DTPA-067-213.
Results:
Conjugate: -CHX-A''-DTPA-seeMet 12.
Results:
| Antibody Conjugate | Isotope | Clinical Phase | Key Mechanism |
|---|---|---|---|
| MORAb-009 | Preclinical | Mesothelin imaging/therapy | |
| 067-213 | Preclinical | CD73 expression monitoring | |
| seeMet 12 | Preclinical | cMet inhibition + radioisotopes |
CHX3 (Cation/H+ Exchanger 3) is a protein found in Arabidopsis thaliana that belongs to the family of cation/H+ exchangers. These membrane transporters are involved in ion homeostasis, particularly K+ transport and pH regulation in plant cells. CHX3 is expressed in various tissues and plays important roles in cellular ion balance, membrane potential maintenance, and stress responses in plants.
Based on available product information, the commercially available CHX3 Antibody has been validated for ELISA and Western Blot applications . These applications enable researchers to detect and quantify CHX3 protein in research samples. When planning experiments, researchers should consider:
ELISA: Suitable for quantitative detection in solution
Western Blot: Appropriate for detection and size confirmation after electrophoretic separation
Potential for optimization in other immunological applications with proper validation
For optimal stability and performance, antibodies should generally be stored according to these guidelines:
Long-term storage: -20°C to -80°C, with preference for -80°C for extended periods
Working aliquots: 4°C for 1-2 weeks to minimize freeze-thaw cycles
Avoid repeated freeze-thaw cycles by preparing single-use aliquots
Store in manufacturer-recommended buffer conditions
Consider addition of stabilizing proteins (BSA) for diluted working solutions
Always refer to specific manufacturer recommendations, as formulation differences may affect stability profiles.
A robust experimental design incorporating appropriate controls is crucial for reliable results. When working with CHX3 Antibody, include:
| Control Type | Purpose | Implementation |
|---|---|---|
| Positive Control | Verify antibody functionality | Sample known to express CHX3 (e.g., specific Arabidopsis tissues) |
| Negative Control | Assess non-specific binding | Sample lacking CHX3 expression or knockout/knockdown line |
| Technical Control | Evaluate methodology | Secondary antibody-only control |
| Loading Control | Ensure equal sample loading | Detection of housekeeping protein (e.g., actin, tubulin) |
| Blocking Peptide | Confirm specificity | Pre-incubation of antibody with immunizing peptide |
The implementation of these controls enables confident interpretation of results and troubleshooting of unexpected observations.
Plant tissues contain various compounds that can interfere with antibody-antigen interactions. Consider these methodological approaches:
Include reducing agents (DTT, β-mercaptoethanol) to disrupt disulfide bonds
Add protease inhibitor cocktails to prevent protein degradation
Incorporate PVPP or similar compounds to remove phenolic compounds
Use detergents appropriate for membrane proteins (CHAPS, Triton X-100)
Optimize buffer pH and ionic strength based on CHX3 biochemical properties
Consider subcellular fractionation if CHX3 signal is weak in total extracts
Sample preparation quality significantly impacts downstream detection sensitivity and specificity.
The CHX family in Arabidopsis contains multiple members with potential sequence homology. To ensure specificity:
Perform sequence alignment analysis to identify unique epitopes
Validate specificity using genetic knockouts or knockdowns
Conduct peptide competition assays with related CHX peptides
Consider immunoprecipitation followed by mass spectrometry identification
Correlate protein detection with transcript analysis using qRT-PCR
A multi-method validation approach substantially increases confidence in antibody specificity determinations.
When CHX3 detection proves difficult, consider these methodological adjustments:
Signal enhancement approaches:
Amplification systems (biotin-streptavidin, tyramide)
Extended substrate incubation times
Sensitivity-optimized detection reagents
Background reduction methods:
Longer/additional washing steps
Alternative blocking agents (fish gelatin, plant-derived proteins)
Pre-adsorption of secondary antibodies
Sample enrichment techniques:
Membrane fractionation
Immunoprecipitation
Protein concentration methods
Systematic optimization of these parameters often resolves detection challenges.
For rigorous quantification of Western blot results:
Use calibrated image acquisition systems with linear dynamic range
Include protein loading standards at multiple concentrations
Employ image analysis software for densitometry
Normalize to appropriate loading controls
Present data with statistical analysis across biological replicates (n≥3)
The following formula may be used for relative quantification:
Multiple bands in Western blots may reflect:
Post-translational modifications
Alternative splice variants
Proteolytic processing
Non-specific binding
Analytical approaches include:
Comparison with predicted molecular weights
Treatment with phosphatases or glycosidases
Correlation with transcript analysis
Comparison across tissue types and experimental conditions
Peptide competition assays
Systematic documentation and analysis of band patterns across multiple experiments enables confident interpretation.
To investigate CHX3 protein interactions:
Co-immunoprecipitation (Co-IP):
Use CHX3 antibody to precipitate protein complexes
Analyze by mass spectrometry or Western blot
Proximity ligation assay (PLA):
Visualize protein interactions with spatial resolution
Particularly useful for membrane proteins
Pull-down assays:
Use recombinant CHX3 as bait for interacting partners
Combine with mass spectrometry for unbiased discovery
Split reporter systems:
BiFC or split luciferase for in vivo validation
Provides spatial information about interactions
Each technique offers complementary information about protein interaction networks.
When investigating CHX3 expression under various stress conditions:
Experimental design considerations:
Include time-course analyses to capture dynamic responses
Standardize tissue collection protocols
Control for circadian or developmental effects
Technical considerations:
Use multiple reference genes/proteins that remain stable under stress
Implement randomized processing to avoid batch effects
Include technical and biological replicates
Data interpretation:
Consider post-translational modifications induced by stress
Correlate protein changes with functional assays
Compare with transcriptional responses
For subcellular localization studies:
Fixation optimization:
Test multiple fixatives (paraformaldehyde, glutaraldehyde)
Optimize fixation times and temperatures
Permeabilization methods:
Evaluate detergents (Triton X-100, saponin)
Consider enzyme-based approaches for dense tissues
Antibody validation:
Use known CHX3 expression patterns as positive controls
Include knockout/knockdown lines as negative controls
Perform peptide competition assays
Co-localization with subcellular markers:
Use established organelle markers
Quantify co-localization using appropriate algorithms
Systematic optimization enables confident interpretation of subcellular distribution patterns.
For robust statistical analysis:
Experimental design considerations:
Power analysis to determine sample size
Biological replicates (n≥3)
Technical replicates
Data distribution assessment:
Test for normality (Shapiro-Wilk test)
Evaluate homogeneity of variance
Statistical tests:
For normally distributed data: t-tests, ANOVA with post-hoc tests
For non-parametric data: Mann-Whitney, Kruskal-Wallis
Multiple testing correction:
Bonferroni correction for conservative approach
False Discovery Rate for less stringent correction
Data visualization:
Box plots or violin plots to show distribution
Include individual data points
Rigorous statistical approach ensures reliable interpretation of experimental results.