hoxd11a Antibody

What are the primary applications for HOXD11 antibodies in research?

HOXD11 antibodies are primarily used in Western Blot (WB), Immunohistochemistry (IHC), Immunofluorescence (IF), and ELISA applications. According to validation data, antibodies like 18734-1-AP show reactivity with human, mouse, and rat samples . These applications enable researchers to detect and quantify HOXD11 protein expression in various experimental contexts, particularly useful for developmental biology studies and pathological investigations where HOXD11 expression may be altered.

What is the molecular profile of HOXD11 protein that antibodies detect?

HOXD11 has a calculated molecular weight of approximately 35 kDa, though the observed molecular weight in experimental conditions typically ranges between 32-36 kDa . This protein is encoded by the HOXD11 gene (NCBI Gene ID: 3237) and has the UniProt ID P31277. When designing experiments, researchers should account for this molecular weight range when interpreting Western blot results and consider potential post-translational modifications that might affect migration patterns.

What is the functional significance of HOXD11 in biological systems?

HOXD11 functions as a developmental regulatory protein that provides cells with specific positional identities on the anterior-posterior axis. It particularly plays a significant role in forelimb morphogenesis . Recent research has also implicated HOXD11 in cartilage maintenance, with inhibition of HOXD11 promoting cartilage degradation and being associated with osteoarthritis development . Understanding these functional aspects is critical when designing research questions around HOXD11.

What are the recommended dilutions for different applications of HOXD11 antibodies?

Optimal dilutions vary by application and specific antibody. For example:

It is crucial to titrate these reagents in each testing system to obtain optimal results, as the ideal dilution can be sample-dependent . Pilot experiments using a dilution series are recommended for new experimental systems.

How should HOXD11 antibodies be stored to maintain reactivity?

HOXD11 antibodies are typically supplied in PBS with 0.02% sodium azide and 50% glycerol at pH 7.3 . The recommended storage condition is -20°C, where the antibody remains stable for one year after shipment. Importantly, aliquoting is unnecessary for -20°C storage for many commercial preparations. Some formulations (20μl sizes) may contain 0.1% BSA as a stabilizer . Avoid repeated freeze-thaw cycles to preserve antibody activity.

What controls should be included when using HOXD11 antibodies in experimental designs?

When designing experiments with HOXD11 antibodies, researchers should include:

• Positive controls: SMMC-7721 cells have been validated as suitable positive controls for Western blot

• Negative controls: Cell lines or tissues known not to express HOXD11

• Isotype controls: Using matched rabbit IgG to control for non-specific binding

• HOXD11 knockdown/overexpression samples: To validate antibody specificity

• Blocking peptide controls: Using the immunizing peptide to confirm specificity

These controls help validate experimental findings and ensure the observed signals are specific to HOXD11.

How can HOXD11 antibodies be utilized to investigate its role in osteoarthritis pathogenesis?

HOXD11 has been identified as significantly downregulated in osteoarthritis (OA) chondrocytes compared to normal controls (P < 0.05), with a log2 fold change of -1.31709 . Researchers can use HOXD11 antibodies to:

• Quantify HOXD11 protein levels in OA and normal cartilage samples using Western blot

• Perform immunohistochemistry to localize HOXD11 expression in cartilage tissues

• Investigate co-localization with other cartilage markers like SOX9 and COL2A1 using dual immunofluorescence

• Monitor changes in HOXD11 expression during disease progression

Such approaches have revealed that HOXD11 overexpression inhibits cell apoptosis in OA chondrocytes and enhances SOX9 and COL2A1 expression while inhibiting ADAMTS5 and MMP13 expression , suggesting a protective role against cartilage degradation.

What experimental approaches can demonstrate the functional relationship between HOXD11 and the SOX9-COL2A1 signaling pathway?

Based on recent findings, researchers can employ several approaches to investigate the HOXD11-SOX9-COL2A1 axis:

• Co-immunoprecipitation with HOXD11 antibodies to identify protein-protein interactions

• ChIP assays to determine if HOXD11 directly binds to SOX9 or COL2A1 regulatory regions

• HOXD11 overexpression followed by qRT-PCR and Western blot to quantify:

  • SOX9 and COL2A1 expression changes (found to increase with HOXD11 overexpression)

  • ADAMTS5 and MMP13 expression changes (found to decrease with HOXD11 overexpression)

• Luciferase reporter assays with SOX9 promoter constructs to assess direct transcriptional regulation

These methodologies can help elucidate whether HOXD11 regulates cartilage homeostasis via direct or indirect modulation of the SOX9-COL2A1 pathway.

What strategies can address non-specific binding when using HOXD11 antibodies in complex tissues?

Non-specific binding can complicate interpretation of HOXD11 staining, particularly in tissues with high background. Researchers can implement these optimization strategies:

• Increase blocking duration and concentration (5% BSA or 10% normal serum)

• Optimize antibody dilution (starting with manufacturer recommendations like 1:100-1:300 for IHC )

• Include detergents in washing buffers (0.1-0.3% Triton X-100)

• Perform antigen retrieval optimization (testing both citrate and EDTA-based buffers)

• Use highly purified antibodies (antigen affinity-purified preparations show better specificity )

• Employ fluorophore-conjugated secondary antibodies for improved signal-to-noise ratio in IF

• Include absorption controls using the immunizing peptide

These approaches can significantly improve specificity when detecting HOXD11 in complex tissues like cartilage.

How can researchers validate HOXD11 antibody specificity across experimental systems?

To ensure reliable results, researchers should:

• Compare results from multiple HOXD11 antibodies recognizing different epitopes

• Perform genetic validation using HOXD11 knockout/knockdown models

• Conduct overexpression experiments with tagged HOXD11 constructs

• Test cross-reactivity with related HOX proteins, especially HOXA11 which has structural similarity

• Validate across multiple detection methods (WB, IHC, IF) to confirm consistency

• Compare reactivity across species (human, mouse, rat) when performing comparative studies

Studies demonstrating HOXD11 downregulation in OA employed multiple validation approaches, including qRT-PCR, Western blot, and immunohistochemistry to confirm findings .

What is the potential for using HOXD11 as a therapeutic target in osteoarthritis?

Research has demonstrated that HOXD11 is significantly downregulated in OA chondrocytes and cartilage compared to normal controls . Experimental evidence indicates that:

• Lentivirus-mediated overexpression of HOXD11 reversed OA effects on chondrocyte proliferation and apoptosis

• HOXD11 overexpression enhanced SOX9 and COL2A1 expression while inhibiting catabolic enzymes ADAMTS5 and MMP13

• These changes corresponded with reduced cartilage damage in experimental models

These findings suggest that therapeutic approaches targeting HOXD11 expression or activity could potentially prevent OA cartilage degradation . Researchers investigating this avenue should consider:

• Delivery mechanisms for HOXD11 expression systems to affected joints

• Potential regulatory molecules that could enhance endogenous HOXD11 expression

• Downstream effectors that might be more accessible therapeutic targets

How can HOXD11 antibodies contribute to understanding developmental disorders affecting limb formation?

Given HOXD11's established role in forelimb morphogenesis , HOXD11 antibodies can be applied to:

• Map spatiotemporal expression patterns during limb development using immunohistochemistry

• Compare HOXD11 expression in normal versus pathological development

• Investigate protein-protein interactions with other developmental regulators

• Study chromatin remodeling at HOXD11-regulated loci using ChIP-seq

• Evaluate changes in HOXD11 expression in response to environmental teratogens

These approaches could provide insights into congenital limb malformations and potential therapeutic interventions for developmental disorders.

What technical considerations should be addressed when studying HOXD11 in differentiation models and organoid systems?

When investigating HOXD11 in advanced model systems like organoids, researchers should consider:

• Selection of appropriate antibodies validated in 3D culture systems

• Optimization of fixation and permeabilization protocols for complex 3D structures

• Use of clearing techniques to improve antibody penetration in organoids

• Combining HOXD11 immunostaining with lineage markers to track developmental processes

• Employing phospho-specific antibodies if HOXD11 activity is regulated by phosphorylation

• Implementing live imaging approaches with fluorescently tagged HOXD11 constructs

Publications have successfully used HOXD11 antibodies in complex systems including kidney organoids with patterned nephron segments , demonstrating the feasibility of these approaches with proper optimization.

How do HOXA11 and HOXD11 antibodies differ in their specificity and cross-reactivity?

Some commercially available antibodies target both HOXA11 and HOXD11 due to sequence similarities between these paralogous proteins. When selecting antibodies:

• Antibodies like PACO06560 are designed to detect both HOXA11 and HOXD11

• These dual-specificity antibodies are synthesized using peptides derived from the C-terminal region of human HOXA11/HOXD11

• For studies requiring discrimination between HOXA11 and HOXD11, researchers should:

  • Select antibodies raised against unique epitopes

  • Validate specificity using overexpression of tagged constructs

  • Consider paired knockdown experiments to confirm target identity