ML4 Antibody

What is IL-4 and why are IL-4 antibodies important in immunological research?

IL-4 (Interleukin-4) is a pleiotropic cytokine with two dominant functions: regulating differentiation of naïve CD4+ T cells to the Th2 type and regulating IgE and IgG1 production by B cells. IL-4 antibodies are critical research tools that allow scientists to study IL-4's role in various immunological pathways .

IL-4 is expressed primarily by activated Th2 cells and NK cells, and at lower levels by mast cells and basophils. It promotes cell proliferation, survival, and immunoglobulin class switch to IgG4 and IgE in human B cells, acquisition of the Th2 phenotype by naïve CD4+ T cells, and plays a dominant role in the development of allergic inflammation and asthma .

What are the primary applications of anti-IL-4 antibodies in research settings?

Anti-IL-4 antibodies have multiple research applications including:

The neutralization dose (ND50) for Human IL-4 Antibody (clone 34019) is typically 0.5-1.5 µg/mL in the presence of 0.5 ng/mL Recombinant Human IL-4 . For Mouse IL-4 Antibody (clone 30340R), the ND50 is typically 0.1-0.6 µg/mL in the presence of 7.5 ng/mL Recombinant Mouse IL-4 .

How can anti-IL-4 receptor antibodies be utilized to measure IL-4 production in human T cell cultures?

Detecting IL-4 production in T cell cultures can be challenging due to rapid consumption of the cytokine. Using anti-IL-4 receptor monoclonal antibodies helps overcome this limitation by blocking the interaction between IL-4 and its receptor.

Methodology:

• Culture purified T cells with anti-CD3 (immobilized on culture plates) and variable rIL-4 concentrations.

• Add anti-IL-4R MoAb at a concentration of 2.5 μg/ml to block IL-4-receptor interaction.

• The MoAb concentration of 1 μg/ml is sufficient to completely block the effect of IL-4 at 10 ng/ml.

• Use ELISA to quantify accumulated IL-4 in the supernatant.

This technique allows for accurate measurement of IL-4 production by preventing its consumption, as demonstrated in experiments with tetanus toxoid (TT) stimulated PBMC where IL-4 was only detectable when anti-IL-4R MoAb was added to the cultures .

What are the methodological considerations when designing IL-4 neutralization experiments?

When designing IL-4 neutralization experiments, researchers should consider:

• Antibody Clone Selection: Different clones have varying neutralization capacities. For example:

  • Clone 34019 (human IL-4) has an ND50 of 0.5-1.5 µg/mL at 0.5 ng/mL IL-4

  • Clone 11B11 (mouse IL-4) effectively neutralizes both natural and recombinant IL-4

• Experimental Readout Systems:

  • TF-1 human erythroleukemic cell line proliferation assays for human IL-4

  • HT-2 mouse T cell line proliferation assays for mouse IL-4

• Titration Protocol:

  • Establish a dose-dependent response curve with recombinant IL-4

  • Use increasing concentrations of neutralizing antibody to determine optimal blocking concentration

  • Confirm specificity by including isotype control antibodies

• Verification of Neutralization:

  • Monitor downstream signaling events (phosphorylation, gene expression)

  • Include positive and negative controls to validate neutralization efficacy

How do species-specific differences affect IL-4 antibody selection and experimental design?

Human, mouse, and rat IL-4 are species-specific in their activities , which has important implications for experimental design:

• Cross-reactivity limitations:

  • Human IL-4 antibodies typically do not cross-react with mouse or rat IL-4

  • Some human IL-4 antibodies (like clone 8D4-8) may cross-react with chimpanzee, baboon, cynomolgus, and rhesus IL-4

  • Mouse-specific antibodies (like clone 11B11) are required for mouse studies

• Model system selection:

  • Humanized mouse models may require both human and mouse IL-4 antibodies

  • Co-culture systems with cells from different species require careful antibody selection

• Control validations:

  • ELISA pairs should be tested for cross-reactivity with other cytokines

  • The 8D4-8/MP4-25D2 ELISA pair shows no cross-reactivity with multiple tested cytokines including mouse IL-4

What is MLL4 and what are MLL4 antibodies used for in epigenetic research?

MLL4 (also known as KMT2B, Lysine Methyltransferase 2B) is a histone methyltransferase involved in the methylation of lysine 4 of histone H3, thus acting as a transcriptional regulator . It is a member of the Class V-like SAM-binding methyltransferase superfamily and the Histone-lysine methyltransferase family, TRX/MLL subfamily .

MLL4 antibodies are valuable tools in epigenetic research, primarily used for:

• Chromatin Immunoprecipitation (ChIP) analysis

• Western blotting for protein detection

• Immunohistochemistry to study tissue expression patterns

• Immunoprecipitation to study protein-protein interactions

What are the key technical specifications to consider when selecting an MLL4 antibody?

When selecting an MLL4 antibody for research, consider:

How can MLL4 antibodies be optimized for ChIP-seq applications in epigenetic studies?

Optimizing MLL4 antibodies for ChIP-seq requires:

• Antibody Selection and Validation:

  • Select antibodies specifically validated for ChIP-seq applications

  • Anti-MLL4 antibody (ABE1867) has been successfully used for ChIP-seq to detect MLL4 genomic enrichment sites in a cell type- and differentiation stage-specific manner

• Protocol Optimization:

  • Optimize chromatin fragmentation to 200-500bp fragments

  • Determine optimal antibody concentration through titration experiments

  • Include appropriate negative controls (IgG) and positive controls (known MLL4 target genes)

  • Use stringent washing conditions to reduce background

• Data Analysis Considerations:

  • MLL4 occupancy may be cell-type specific, with different enrichment patterns

  • In MEFs, MLL4 occupancy was detected on PPARγ1 but not PPARγ2 proximal promoter

  • In differentiating murine brown preadipocytes, MLL4 enrichment was found on PPARγ1, PPARγ2, and C/EBP promoters

• Biological Validation:

  • Confirm ChIP-seq findings using independent techniques (qPCR, reporter assays)

  • Compare MLL4 binding with histone modification patterns (H3K4me3)

What are the methodological approaches for studying MLL4 protein complexes using immunoprecipitation with MLL4 antibodies?

MLL4 functions in multi-protein complexes that regulate gene expression. To study these complexes:

• Co-Immunoprecipitation Strategy:

  • Use nuclear extracts from your cells of interest

  • Immunoprecipitate with validated anti-MLL4 antibodies

  • A representative lot has successfully immunoprecipitated MLL3/MLL4 complex components (UTX, PTIP, RbBP5 and PA1) and C/EBPβ, but not Menin, from mouse brown preadipocyte nuclear extracts prepared at day 2 of adipogenesis

• Controls and Validation:

  • Include IgG control immunoprecipitations

  • Validate immunoprecipitation efficiency with western blotting for MLL4

  • Confirm specificity by immunoblotting for known interactors

• Analysis of Novel Interactions:

  • Use mass spectrometry to identify novel binding partners

  • Confirm interactions with reciprocal co-immunoprecipitation

  • Validate biological relevance with functional assays

• Temporal Analysis:

  • Study changes in complex composition during differentiation or in response to stimuli

  • MLL4 complex composition changes during adipogenesis, with differential recruitment of transcription factors

How do researchers address contradictory results when using different MLL4 antibody clones in epigenetic studies?

When facing contradictory results with different MLL4 antibody clones:

• Comprehensive Antibody Validation:

  • Verify specificity using multiple approaches (western blot, knockout controls)

  • Test antibodies on known MLL4 targets in control cell lines

  • Compare epitope recognition sites of different antibodies

• Cross-validation Strategies:

  • Use orthogonal approaches to confirm findings (e.g., CUT&RUN, CUT&Tag)

  • Employ genetic approaches (siRNA knockdown, CRISPR knockout) to validate antibody specificity

  • Use tagged MLL4 constructs as positive controls

• Context-Dependent Binding Analysis:

  • MLL4 genomic enrichment is cell type- and differentiation stage-specific

  • Different antibodies may recognize distinct conformations or post-translational modifications

  • Consider that MLL4 may interact with different partners in various cellular contexts

• Technical Considerations:

  • Standardize experimental conditions across antibodies (fixation method, chromatin preparation)

  • Use consistent bioinformatic pipelines for data analysis

  • Publish detailed methods including antibody lot numbers and experimental conditions