BUD25 Antibody

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Description

Structure and Function of CD25

  • CD25 is a 55 kDa type I transmembrane glycoprotein comprising an extracellular domain with two complement control protein (CCP) motifs, a transmembrane region, and a short cytoplasmic tail .

  • It forms a heterotrimeric complex with CD122 (IL-2Rβ) and CD132 (IL-2Rγ) to mediate IL-2 signaling .

  • Expression: Constitutively high on Tregs, transiently upregulated on activated effector T cells (Teff), and expressed on B cells, NK cells, and activated monocytes .

Rationale for Targeting CD25 in Cancer

  • Tregs suppress antitumor immune responses, contributing to tumor progression and resistance to checkpoint inhibitors (e.g., anti-PD1) .

  • Anti-CD25 antibodies aim to selectively eliminate Tregs while sparing effector T cells, leveraging the transient CD25 expression on Teff cells .

BA9 and BT942/BA1106

  • Developed by Boan Biotech using human antibody transgenic mice (BAhuMab™) and phage display technology .

  • Mechanism:

    • Bind specifically to CD25 without blocking IL-2 signaling, preserving effector T cell activation .

    • Induce antibody-dependent cellular cytotoxicity (ADCC) against Tregs .

ParameterBA9BT942/BA1106
Binding Affinity (EC50)0.35 μg/mL (SU-DHL-1)1.20 μg/mL (SU-DHL-1)
ADCC IC50 (SU-DHL-1)0.025 μg/mL0.037 μg/mL
Tumor Growth Inhibition60.6% (MC38 model)66.6% (MC38 model)
Synergy with anti-PD1Significant tumor clearanceEnhanced efficacy

Preclinical Efficacy

  • Tumor Models:

    • MC38 Colon Cancer: Both BA9 and BT942 achieved >60% tumor growth inhibition (TGI) at 10 mg/kg, with BT942 showing superior synergy with anti-PD1 therapy .

    • Late-Stage Tumors: BA9 reduced Treg infiltration by 70–80%, improving CD8+/Treg ratios .

  • Immunological Impact:

    • Increased CD8+ and CD4+ Teff cell infiltration in tumor microenvironments .

    • BT942 preferentially targets Tregs over activated Teff cells, minimizing immune suppression .

Clinical Potential

  • Therapeutic Window:

    • CD25 expression on Tregs (high) vs. Teff cells (transient) allows selective depletion .

    • Avoids IL-2 signaling blockade, preserving immune homeostasis .

  • Pipeline:

    • BA1106 (a variant of BT942) is advancing toward clinical trials as a combination therapy with anti-PD1 agents .

Comparison with Existing Therapies

FeatureAnti-CD25 AntibodiesConventional Therapies
SelectivityTreg-specificBroad immune suppression
IL-2 SignalingUnaffectedOften disrupted
Synergy with Anti-PD1Enhanced efficacyLimited in Treg-rich tumors

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
BUD25 antibody; YER014C-ABud site selection protein 25 antibody
Target Names
BUD25
Uniprot No.

Target Background

Function
BUD25 Antibody plays a crucial role in bud site selection. It is essential for cellular resistance to the DNA-damaging agent methyl methanesulfonate (MMS).
Database Links

Q&A

What is BUD25 Antibody and what cellular targets does it recognize?

BUD25 Antibody appears to be produced by CUSABIO-WUHAN HUAMEI BIOTECH Co., Ltd. (catalog number: CSB-PA306349XA01SVG-10mg) . While specific information about BUD25 is limited in the available literature, it may be related to CD25 (Interleukin-2 receptor alpha chain), which is highly expressed on regulatory T cells (Treg cells) in the tumor microenvironment . CD25 serves as a potential target for Treg deletion in cancer immunotherapy approaches. Researchers should verify the specific epitope recognition properties with the manufacturer before designing experiments.

What experimental applications are validated for BUD25 Antibody?

Based on general antibody methodologies used in immunological research, BUD25 Antibody may be suitable for techniques such as immunoblotting, immunofluorescence confocal microscopy, and flow cytometry . When working with antibodies targeting CD25 or similar receptors, these techniques typically require specific optimization protocols. For instance, immunoblotting usually involves protein separation on gradient polyacrylamide gels (4-15%) followed by transfer to nitrocellulose membranes and visualization using fluorescent-conjugated secondary antibodies . Researchers should validate the specific applications appropriate for BUD25 through preliminary testing.

How should I design proper controls when using BUD25 Antibody?

Proper experimental controls are essential when working with any antibody, including BUD25. For flow cytometry applications with CD25 antibodies, the literature suggests using blocking protocols to prevent non-specific binding: incubate cells with blocking antibody (no fluorescent conjugate) before adding the experimental antibody . Additionally, implementing isotype controls with matching F/P ratios is recommended for accurate analysis. For immunoblotting, include positive and negative control tissues/cell lines with known expression levels of the target protein. Validation experiments should include appropriate secondary antibody-only controls to assess background signal levels .

What is the recommended protocol for BUD25 Antibody in immunofluorescence applications?

While specific protocols for BUD25 Antibody are not detailed in the available literature, immunofluorescence protocols for antibodies targeting receptors like CD25 typically follow standard approaches. Based on established methodologies, researchers should:

  • Fix cells/tissues appropriately (paraformaldehyde or methanol-based fixation)

  • Implement a blocking step to reduce non-specific binding

  • Incubate with primary antibody (BUD25) at optimized concentration

  • Wash thoroughly to remove unbound antibody

  • Incubate with fluorophore-conjugated secondary antibody

  • Include DAPI or similar nuclear counterstain

  • Mount and visualize using confocal microscopy

For quantitative analysis, laser-scanning cytometry can determine the distribution of protein expression among cells, as demonstrated with other antibodies in the literature .

How should I optimize BUD25 Antibody for flow cytometry experiments?

For flow cytometry applications with antibodies similar to BUD25, the literature emphasizes several critical optimization steps:

  • Blocking Protocol: Incubate cells with non-conjugated blocking antibody before adding fluorescently-labeled antibodies to reduce non-specific binding .

  • Titration Series: Create a dilution series of antibody concentrations to determine optimal signal-to-noise ratio.

  • Multi-color Consideration: If using multiple antibodies, verify that the chosen fluorophores have minimal spectral overlap or implement appropriate compensation.

  • Control Tubes: Prepare control tubes with all antibodies except BUD25, and another tube with an appropriate isotype control with matching F/P ratio from the same manufacturer .

This approach helps distinguish specific from non-specific binding and ensures accurate interpretation of results.

What troubleshooting approaches are recommended for non-specific binding issues?

When experiencing non-specific binding with BUD25 or similar antibodies, systematic troubleshooting approaches include:

  • Increase Blocking Intensity: Extend blocking time or use alternative blocking agents (BSA, serum, commercial blockers).

  • Optimize Antibody Concentration: Excessive antibody concentration can increase non-specific binding; perform additional titration experiments.

  • Modify Washing Steps: Increase number or duration of washes between antibody incubations.

  • Pre-adsorption: For tissue samples with high endogenous Fc receptor expression, pre-incubate the antibody with recombinant protein containing the target epitope.

  • Buffer Optimization: Adjust salt concentration or pH in washing and incubation buffers.

Researchers should document all optimization steps to ensure reproducibility across experiments .

How can BUD25 Antibody be integrated into multi-parameter analysis workflows?

Multi-parameter analysis with antibodies requires careful experimental design to avoid signal interference. For antibodies targeting receptors like CD25, established protocols suggest:

  • Panel Design: When incorporating BUD25 into antibody panels, select fluorophores based on target abundance (brighter fluorophores for low-abundance targets).

  • Compensation Controls: Prepare single-color controls for each fluorophore in your panel to enable accurate compensation.

  • FMO Controls: Fluorescence Minus One controls help establish accurate gating boundaries in multi-parameter experiments.

  • Validation Beads: Use antibody-capture beads to confirm that each antibody-fluorophore conjugate is functional under experimental conditions .

This systematic approach ensures reliable data interpretation in complex experimental designs.

What role might BUD25 Antibody play in tumor immunology research?

If BUD25 Antibody targets CD25 or related receptors, it could have significant applications in tumor immunology research. Anti-CD25 antibodies are being investigated as therapeutic agents that deplete regulatory T cells (Tregs) in the tumor microenvironment through antibody-dependent cellular cytotoxicity (ADCC) . This approach aims to reduce immunosuppression and enhance anti-tumor immune responses.

Current research with anti-CD25 antibodies like BA1106 demonstrates efficacy in both early-stage and advanced tumor models, with particular synergistic effects when combined with anti-PD1 antibodies . These antibodies selectively target Tregs without blocking IL-2 signaling pathways, overcoming limitations of previous generations of anti-CD25 antibodies . Researchers exploring BUD25 should investigate whether it shares these beneficial properties for potential cancer immunotherapy applications.

How does antibody format impact experimental outcomes in advanced applications?

The structural characteristics of antibodies significantly influence their functionality in complex experimental systems. Recent developments in antibody engineering, such as bispecific antibodies, demonstrate that format modifications can enhance therapeutic potential . For researchers working with BUD25:

  • Epitope Accessibility: The specific epitope recognized by BUD25 may impact its ability to bind to the target in different experimental contexts (fixed vs. live cells, denatured vs. native protein).

  • Antibody Class: The IgG subclass of BUD25 will affect its interaction with Fc receptors and complement, potentially influencing functional assays.

  • Conjugation Effects: If using conjugated versions of BUD25, the conjugation chemistry and fluorophore/enzyme selection may affect antibody avidity and specificity.

Current research indicates that antibody format optimization is crucial for developing effective therapeutics that can overcome tumor immune evasion mechanisms .

What approaches are recommended for quantitative analysis of BUD25 Antibody binding?

For quantitative analysis of antibody binding in research applications, several methodological approaches are recommended:

  • Western Blot Quantification: For immunoblotting applications, use infrared fluorescence scanning with appropriate software (e.g., Odyssey) to quantify protein bands, normalizing to loading controls .

  • Flow Cytometry Analysis: When analyzing receptor expression by flow cytometry, calculate both the percentage of positive cells and the mean fluorescence intensity (MFI) to assess both population frequency and expression level per cell.

  • Immunofluorescence Quantification: For microscopy-based applications, use laser-scanning cytometry to determine the distribution of protein expression among cells, quantifying both signal intensity and subcellular localization .

These quantitative approaches provide more robust data than qualitative assessments and enable statistical comparisons between experimental conditions.

How should researchers address contradictory results between different experimental platforms?

When facing contradictory results using BUD25 Antibody across different experimental platforms, implement this systematic troubleshooting approach:

  • Verify Antibody Specificity: Confirm that BUD25 specifically recognizes its intended target using multiple techniques (western blot, immunoprecipitation, knockout/knockdown validation).

  • Evaluate Protocol Differences: Systematically compare fixation methods, blocking reagents, incubation conditions, and detection systems between platforms.

  • Consider Epitope Accessibility: The epitope recognized by BUD25 may be differentially accessible in different experimental contexts (e.g., denatured vs. native protein conformations).

  • Biological Variability: Assess whether contradictions reflect true biological differences between sample types rather than technical artifacts.

  • Triangulate with Alternative Methods: Use alternative detection methods or antibodies recognizing different epitopes of the same target to validate findings.

Discrepancies often reveal important biological insights rather than simply representing technical failures.

What statistical approaches are appropriate for analyzing BUD25 Antibody-generated data?

Robust statistical analysis of antibody-generated data requires approaches tailored to the specific experimental design:

  • Flow Cytometry Data: For comparing expression levels between groups, use appropriate parametric (t-test, ANOVA) or non-parametric tests (Mann-Whitney, Kruskal-Wallis) based on data distribution. For correlation analyses, employ Pearson or Spearman correlation coefficients.

  • Immunohistochemistry Quantification: When analyzing tissue staining patterns, consider both staining intensity and percentage of positive cells, potentially using H-score or Allred scoring systems for semi-quantitative analysis.

  • Immunoblotting Analysis: For western blot quantification, normalize band intensity to appropriate loading controls and apply statistical tests to normalized values across multiple biological replicates.

  • Multiple Comparisons Correction: When analyzing multiple parameters simultaneously, implement appropriate corrections (Bonferroni, Benjamini-Hochberg) to control for family-wise error rates.

Transcriptome analysis following antibody-based cell sorting may require specialized bioinformatics approaches, including principal component analysis to examine biological and technical variations .

How might BUD25 Antibody contribute to the development of novel immunotherapeutic approaches?

If BUD25 Antibody targets CD25 or related immune receptors, it could contribute to emerging immunotherapeutic strategies. Current research with anti-CD25 antibodies demonstrates promising applications in cancer immunotherapy by selectively depleting regulatory T cells (Tregs) in the tumor microenvironment . Future research directions might include:

  • Combination Therapies: Exploring synergistic effects of combining BUD25 with checkpoint inhibitors (anti-PD1/PD-L1) or other immunomodulatory agents.

  • Antibody Engineering: Developing modified versions of BUD25 with enhanced effector functions or tumor-targeting capabilities.

  • Predictive Biomarkers: Identifying patient populations most likely to benefit from BUD25-based therapies through correlation with clinical outcomes.

  • Novel Delivery Systems: Investigating targeted delivery approaches to enhance tumor specificity and reduce systemic effects.

The evolving landscape of bispecific antibodies suggests potential for creating multi-functional therapeutic molecules that simultaneously engage multiple targets .

What are the emerging technologies for enhancing antibody specificity and functionality?

Cutting-edge technologies for enhancing antibody performance that may be relevant to BUD25 and similar research antibodies include:

  • Bispecific/Trispecific Formats: Engineering antibodies that simultaneously recognize multiple targets to enhance specificity or functionality, such as T-cell engagers that co-engage costimulatory molecules .

  • Conditional Activation: Developing antibodies that are selectively activated within specific microenvironments (e.g., tumor-specific activation) to improve targeting.

  • Site-Specific Conjugation: Implementing controlled conjugation methods that preserve antibody function while adding detection or therapeutic moieties.

  • Antibody Fragments: Utilizing smaller antibody formats (Fab, scFv) for improved tissue penetration in certain applications.

  • Computational Design: Applying machine learning and structural biology approaches to optimize antibody-epitope interactions and reduce cross-reactivity.

These emerging technologies represent promising avenues for enhancing the utility of research antibodies like BUD25 in both basic science and translational applications .

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