ARI8 Antibody

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Description

ARID2 (D8D8U) Rabbit mAb

  • Target: ARID2 (AT-rich interaction domain 2), a subunit of the PBAF chromatin remodeling complex.

  • Applications: Validated for Western Blot (WB) and Immunoprecipitation (IP) in human samples .

  • Characteristics:

    ParameterValue
    ReactivityHuman
    Molecular Weight220 kDa
    Host SpeciesRabbit
    CloneD8D8U
    IsotypeIgG

This antibody is critical for studying chromatin remodeling and gene regulation but lacks therapeutic indications .

Ari-4175 (Prolyl Peptidase Inhibitor)

  • Function: Enhances antibody-dependent cellular cytotoxicity (ADCC) via NK cell activation.

  • Mechanism: Augments CD16 (FcγRIII) expression on NK cells, improving cetuximab efficacy in KRAS-mutant colorectal cancer models .

  • Key Findings:

    • Induces neutrophil expansion and CD16/CD69 upregulation in preclinical models.

    • Synergizes with cetuximab (anti-EGFR) but not panitumumab (non-ADCC-inducing anti-EGFR) .

ParameterResult
Dose (Mouse Model)200 µg orally, 5×/week
ADCC Enhancement2.5–3.0× vs. control
Neutrophil DepletionNo impact on NK cell activation

Broadly Neutralizing Antibodies in Clinical Development

While not named "ARI8," several AAV-delivered antibodies are under investigation:

AAV8-VRC07

  • Target: HIV-1 envelope protein.

  • Phase 1 Trial Outcomes:

    ParameterResult
    Dose5×10¹⁰ – 2.5×10¹² vg/kg
    Anti-AAV8 Titers>1:21,870 (persistent ≥40 weeks)
    SafetyNo severe hepatotoxicity

This approach highlights the potential of viral vectors for antibody delivery but does not relate directly to "ARI8" .

Therapeutic Antibodies from Arius Pharmaceuticals

Arius Pharmaceuticals (now defunct) developed antibodies targeting CD44 and CD59:

Anti-CD44 Antibody

  • Indication: Breast cancer (stem cell marker).

  • Preclinical Data:

    • Reduces tumor growth in xenograft models.

    • Epitope prevalence: 70% in patient samples .

Anti-CD59 Antibody (AR36A36.11.1)

  • Function: Blocks complement regulation, enhancing cancer cell lysis.

  • Efficacy: Comparable to Taxotere in vivo .

Bispecific Anti-FIXa/FX Antibody

  • Function: Mimics Factor VIII cofactor activity for hemophilia A.

  • Properties:

    ParameterValue
    Half-life (Monkey)~3 weeks
    Subcutaneous Bioavailability150 mg/mL formulation
    ImmunogenicityMinimal risk

This antibody demonstrates the feasibility of engineering IgG-based therapeutics for bleeding disorders .

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
ARI8 antibody; At1g65430 antibody; T8F5.21Probable E3 ubiquitin-protein ligase ARI8 antibody; EC 2.3.2.31 antibody; ARIADNE-like protein ARI8 antibody; Protein ariadne homolog 8 antibody; RING-type E3 ubiquitin transferase ARI8 antibody
Target Names
ARI8
Uniprot No.

Target Background

Function
ARI8 Antibody is believed to function as an E3 ubiquitin-protein ligase, or potentially as part of an E3 complex. This implies that it accepts ubiquitin from specific E2 ubiquitin-conjugating enzymes and subsequently transfers it to substrate proteins.
Database Links

KEGG: ath:AT1G65430

STRING: 3702.AT1G65430.1

UniGene: At.27225

Protein Families
RBR family, Ariadne subfamily
Tissue Specificity
Ubiquitous.

Q&A

Given the lack of specific information on "ARI8 Antibody" in the search results, I will create a general FAQ collection for researchers based on common questions related to antibody research, focusing on experimental design, data analysis, and methodological approaches. This will include both basic and advanced research questions relevant to antibody studies.

A:

To evaluate the efficacy of a new antibody, researchers should:

  • Select Appropriate Controls: Use both positive and negative controls to ensure the specificity of the antibody.

  • Choose Relevant Assays: Select assays that directly measure the biological activity or binding affinity of the antibody, such as ELISA, Western blot, or flow cytometry.

  • Optimize Conditions: Determine optimal concentrations and incubation times for the antibody to ensure maximal binding without non-specific interactions.

  • Consider In Vivo Models: If applicable, use animal models to assess the antibody's efficacy in a more complex biological system.

A:

  • Re-evaluate Assay Conditions: Ensure that each assay was performed under optimal conditions for the antibody.

  • Consider Assay Sensitivity: Some assays may be more sensitive to detecting changes than others.

  • Use Multiple Replicates: Increase the number of replicates to reduce variability and confirm results.

  • Cross-Validate with Different Techniques: Use orthogonal methods to validate findings, such as using both biochemical and cell-based assays.

A:

  • Framework Selection: Choose human frameworks that are less immunogenic and support high-affinity antigen binding by the murine complementarity-determining regions (CDRs) .

  • CDR Grafting: Ensure that the grafted CDRs maintain their original specificity and affinity for the antigen.

  • Immunogenicity Testing: Perform in vitro and in vivo tests to assess the potential for an immune response against the humanized antibody.

A:

  • Buffer Selection: Choose buffers that maintain antibody stability over a range of pH and temperature conditions.

  • Concentration Optimization: Determine the optimal concentration to minimize aggregation and precipitation.

  • Stabilizers: Consider adding stabilizers like sugars or surfactants to enhance stability during storage and shipping.

A:

  • IgG Subtype Conversion: Switching the IgG subtype can significantly impact anti-tumor activity, as seen with conversions from IgG1 to IgG2a .

  • Affinity Maturation: Use techniques like phage display or yeast display to increase the antibody's affinity for its target.

  • Conjugation with Cytotoxic Agents: Consider conjugating the antibody with drugs or toxins to enhance its cytotoxic effects.

A:

  • Use Multiple Antigens: Test the antibody against both the target antigen and closely related non-target antigens.

  • Knockdown/Knockout Models: Use cells or tissues where the target antigen is knocked down or knocked out to confirm specificity.

  • Orthogonal Validation: Validate findings using different detection methods, such as Western blot and immunofluorescence.

A:

  • Low Expression: Optimize expression conditions, such as temperature and media composition, or consider alternative expression systems.

  • Aggregation: Use stabilizers or alter the formulation buffer to reduce aggregation.

  • Non-Specific Binding: Optimize antibody concentration and incubation times, and consider using blocking agents to reduce background.

A:

  • Protein Flexibility Analysis: Use molecular dynamics to study protein flexibility and predict potential binding sites or conformational changes upon antigen binding .

  • Antibody Design: Simulate the effects of mutations on antibody stability and affinity to guide rational design efforts.

  • Docking Studies: Perform docking simulations to predict antibody-antigen interactions and optimize binding affinity.

A:

  • Informed Consent: Ensure that all participants provide informed consent before using their samples.

  • Privacy Protection: Protect participant privacy by anonymizing samples and data.

  • Regulatory Compliance: Adhere to all relevant regulations and guidelines for human subject research.

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