DDT Mouse mAb: Selection, Validation & Application Guide

DDT Mouse mAb is a mouse-derived monoclonal antibody targeting D-dopachrome tautomerase (DDT), designed to deliver high specificity and reproducibility across a range of standard immunoassay applications.

Product Name

DDT Mouse mAb

Catalog Number

Ab378259

Host Species

Mouse

Antibody Format

Monoclonal antibody (mAb)

Target Antigen

D-dopachrome tautomerase (DDT)

Recommended Storage

Store at -20 °C; avoid repeated freeze-thaw cycles

Overview of DDT and Its Biological Significance

D-dopachrome tautomerase (DDT) is a member of the macrophage migration inhibitory factor (MIF) superfamily of cytokines. It shares structural homology with MIF and has been implicated in inflammatory signaling pathways, making it a relevant target in immunological and oncological research. DDT catalyzes the tautomerization of D-dopachrome to 5,6-dihydroxyindole, and growing evidence suggests it may modulate immune cell activity. The DDT Mouse mAb (Ab378259) provides researchers with a reliable tool to detect and characterize DDT protein expression in experimental models.

Recommended Protocols and Application Guidelines

The DDT Mouse mAb is suitable for use in standard immunoassay formats. Researchers should perform antibody titration experiments to determine the optimal working concentration for their specific application and sample type. Below are general protocol guidelines:

• Western Blot (WB): Denature and resolve protein samples by SDS-PAGE. Transfer to a PVDF or nitrocellulose membrane. Block with 5% non-fat dry milk or BSA in TBST for 1 hour at room temperature. Incubate with DDT Mouse mAb at the empirically determined dilution overnight at 4 °C. Wash and apply appropriate HRP-conjugated secondary anti-mouse antibody. Detect by chemiluminescence.
• Immunofluorescence (IF) / Immunocytochemistry (ICC): Fix cells with 4% paraformaldehyde. Permeabilize with 0.1–0.2% Triton X-100 where required. Block nonspecific binding and incubate with the primary antibody. Use a fluorophore-conjugated anti-mouse secondary antibody for visualization.
• Enzyme-Linked Immunosorbent Assay (ELISA): Coat capture antigen onto microplate wells. Block, then add DDT Mouse mAb at optimized concentration. Detect with HRP-conjugated anti-mouse secondary antibody and appropriate substrate.

Always include a negative isotype control (mouse IgG) and a positive control sample known to express DDT to confirm assay validity.

Storage, Handling, and Stability

Proper storage and handling are critical to maintaining antibody activity and assay reproducibility. Follow these best-practice guidelines for DDT Mouse mAb (Ab378259):

• Store the antibody at -20 °C upon receipt. For long-term storage, -80 °C is recommended where possible.
• Avoid repeated freeze-thaw cycles, which can cause protein aggregation and loss of binding activity. Aliquot the antibody into single-use volumes before freezing.
• Keep the antibody on ice during experimental setup and minimize exposure to light if the product is conjugated to a fluorophore.
• Do not use antibody preparations that appear cloudy or show visible particulates without prior centrifugation (10,000 × g, 5 minutes, 4 °C) and re-evaluation.
• Check the product datasheet for lot-specific information on concentration, formulation buffer, and expiry date.

Antibody Validation and Quality Control

Antibody validation is an essential step before integrating any new reagent into a research workflow. For DDT Mouse mAb, the following validation strategies are recommended in accordance with current best practices in antibody science:

• Genetic knockdown/knockout controls: Use siRNA knockdown or CRISPR-Cas9 knockout cell lines lacking DDT expression to confirm antibody specificity. A significant reduction or absence of signal in knockdown/knockout samples versus wild-type controls validates target specificity.
• Orthogonal methods: Corroborate DDT protein detection results with mRNA expression data (e.g., RT-qPCR) or with an independent antibody recognizing a different epitope.
• Positive tissue/cell controls: Identify cell lines or tissue types with documented DDT expression to serve as reliable positive controls.
• Cross-reactivity assessment: Evaluate potential cross-reactivity with MIF and other structurally related proteins, particularly when working in assay systems where multiple family members may be co-expressed.

Document all validation experiments and retain records for reproducibility and publication compliance.

Troubleshooting Common Issues

If unexpected results are obtained when using DDT Mouse mAb, consult the troubleshooting guide below:

• No signal or weak signal: Verify that the antibody is within its expiry date and has been stored correctly. Increase primary antibody concentration or extend incubation time. Confirm that the secondary antibody is compatible with mouse primary antibodies. Check that the target protein is expressed in the cell/tissue type used.
• High background: Optimize blocking conditions (try BSA instead of milk for phospho-protein detection). Increase the number and duration of wash steps. Reduce primary antibody concentration. Ensure secondary antibody incubation is performed in blocking buffer.
• Non-specific bands (WB): Confirm sample preparation conditions. Run a negative control (lysate from DDT-negative cells). Verify molecular weight of detected band against expected DDT molecular weight.
• Inconsistent results between experiments: Standardize all protocol steps. Use aliquoted antibody stocks to avoid freeze-thaw variation. Record lot numbers for each experiment to track batch-to-batch variability.

Frequently asked questions

What applications is DDT Mouse mAb (Ab378259) suitable for?

DDT Mouse mAb is designed for use in standard immunoassay applications. Typical applications include Western blot (WB), immunofluorescence (IF), immunocytochemistry (ICC), and ELISA. Researchers should validate the antibody in their specific assay format and sample type, as optimal working conditions may vary.

How should DDT Mouse mAb be stored to maintain its activity?

Store DDT Mouse mAb at -20 °C upon receipt. For extended storage, -80 °C is preferred. To prevent loss of activity due to protein aggregation, aliquot the antibody into single-use volumes before freezing and avoid repeated freeze-thaw cycles. Always refer to the product datasheet for lot-specific storage recommendations.

How can I confirm that the DDT Mouse mAb is detecting the correct target?

Antibody specificity can be confirmed using genetic knockdown or knockout controls that lack DDT expression: a significant loss of signal in these samples relative to wild-type cells validates specificity. Complementary approaches include orthogonal detection methods such as RT-qPCR for DDT mRNA, and the use of a second independent antibody targeting a different epitope of DDT.

What controls should be included when using DDT Mouse mAb?

Always include a negative isotype control using a mouse IgG of the same subclass and concentration as the primary antibody to assess non-specific background binding. A positive control consisting of a cell line or tissue sample with confirmed DDT expression should also be run in parallel to verify assay performance.

Is DDT Mouse mAb cross-reactive with MIF or other related proteins?

DDT shares significant structural homology with macrophage migration inhibitory factor (MIF), so potential cross-reactivity should be empirically assessed in each experimental system. Consult the product datasheet for any cross-reactivity data provided, and include appropriate controls when studying samples where MIF and DDT may be co-expressed.

References

1. Aladdin Scientific. Ab378259 DDT Mouse mAb product datasheet. Aladdin Scientific.
2. Merk M, Zierow S, Leng L, Das R, Du X, Schulte W, et al. The D-dopachrome tautomerase (DDT) gene product is a cytokine and functional homolog of macrophage migration inhibitory factor (MIF). Proc Natl Acad Sci USA. 2011.
3. Uhlen M, et al. Proteomics. Tissue-based map of the human proteome. Science. 2015;347(6220):1260419. doi:10.1126/science.1260419

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.