ADH5 Antibody

What is ADH5 and why is it of interest to researchers?

ADH5 (alcohol dehydrogenase 5) is a conserved enzyme involved in alcohol and aldehyde metabolism in mammals. It is a reported synonym of the ADH6 gene, which encodes alcohol dehydrogenase 6 (class V) . The human version of ADH5 has a canonical length of 368 amino acid residues and a protein mass of 39.1 kilodaltons, with two identified isoforms . What makes ADH5 particularly interesting to researchers is its cellular localization in the cytoplasm and its notable expression in several organs including the rectum, liver, gallbladder, duodenum, and colon . Recent research has also revealed ADH5's novel role as a negative regulator of neuronal differentiation, making it an important target for neurodevelopmental studies .

What are the common experimental applications for ADH5 antibodies?

ADH5 antibodies are employed in multiple experimental techniques with Western Blot (WB) being the most widely used application . Other common applications include:

• Immunohistochemistry (IHC) for tissue localization studies

• Immunofluorescence (IF) for cellular localization

• Enzyme-Linked Immunosorbent Assay (ELISA) for quantitative detection

• Immunoprecipitation (IP) for protein-protein interaction studies

• Flow Cytometry (FCM) for cell population analysis

When selecting an ADH5 antibody, researchers should verify the validated applications for their specific experimental needs, as not all antibodies perform equally across different techniques .

How do I determine which ADH5 antibody is suitable for my experimental system?

Selecting the appropriate ADH5 antibody requires consideration of several key factors:

• Species reactivity: Verify that the antibody recognizes ADH5 in your experimental model organism. Available antibodies show reactivity to human, mouse, rat, and other species .

• Antibody type: Choose between polyclonal antibodies (broader epitope recognition) and monoclonal antibodies (higher specificity). For example, the ADH5 (2D11) antibody is a monoclonal antibody specific for human ADH5 .

• Applications: Ensure the antibody is validated for your specific application. For instance, if performing Western blot analysis of mouse samples, select an antibody validated for WB with mouse reactivity.

• Conjugation needs: Determine if you require an unconjugated antibody or one conjugated to a detection tag (e.g., biotin, FITC, HRP, or fluorophores like Alexa) based on your detection system .

• Epitope location: Consider whether you need an antibody targeting a specific region of ADH5 (e.g., internal region, middle region, or full-length) .

What are the recommended protocols for using ADH5 antibodies in Western blot applications?

For optimal Western blot results with ADH5 antibodies, follow these methodological guidelines:

• Sample preparation: When extracting protein from tissues with high ADH5 expression (liver, colon, etc.), use a gentle lysis buffer containing protease inhibitors to preserve protein integrity.

• Protein loading: Load 20-50 μg of total protein per lane, as ADH5 is expressed at moderate levels in most tissues .

• Gel selection: Use 10-12% SDS-PAGE gels for optimal resolution of ADH5, which has a molecular weight of approximately 39.1 kDa .

• Transfer conditions: Transfer to PVDF or nitrocellulose membranes at 100V for 60-90 minutes in standard transfer buffer.

• Blocking: Block membranes with 5% non-fat dry milk or BSA in TBST for 1 hour at room temperature.

• Primary antibody: Dilute ADH5 antibody according to manufacturer's recommendations (typically 1:500 to 1:2000) and incubate overnight at 4°C .

• Detection: Use appropriate secondary antibody conjugated to HRP, followed by ECL detection or fluorescently labeled secondary antibodies for fluorescence-based imaging systems.

• Controls: Include positive controls (tissues known to express ADH5, such as liver) and negative controls (tissues with minimal ADH5 expression or ADH5-knockout samples) .

How can I optimize immunohistochemistry protocols for ADH5 detection in tissue samples?

For successful immunohistochemical detection of ADH5 in tissue sections, consider these optimization steps:

• Fixation: 4% paraformaldehyde is generally suitable for ADH5 detection. Avoid overfixation which can mask epitopes.

• Antigen retrieval: Perform heat-induced epitope retrieval in citrate buffer (pH 6.0) or EDTA buffer (pH 9.0) to expose ADH5 epitopes that may be masked during fixation.

• Blocking: Use 5-10% normal serum (from the species in which the secondary antibody was raised) to reduce non-specific binding.

• Primary antibody incubation: Dilute ADH5 antibody according to manufacturer's recommendations (typically 1:100 to 1:500) and incubate overnight at 4°C .

• Detection system: Use a detection system compatible with your microscopy setup (e.g., HRP-DAB for brightfield, fluorescent secondary antibodies for fluorescence microscopy).

• Signal amplification: For tissues with lower ADH5 expression, consider using biotin-streptavidin amplification systems or tyramide signal amplification.

• Counterstaining: Use hematoxylin for nuclear counterstaining in brightfield microscopy or DAPI for fluorescence microscopy.

• Controls: Include positive control tissues known to express ADH5 (liver, colon) and negative controls (omitting primary antibody or using ADH5-knockout tissue) .

How can ADH5 antibodies be used to study its role in neuronal differentiation?

Recent research has revealed that ADH5 functions as a negative regulator of neuronal differentiation . To investigate this role using ADH5 antibodies:

• Expression analysis during differentiation: Use Western blot with ADH5 antibodies to monitor changes in ADH5 expression levels throughout neuronal development. Research shows that ADH5 levels gradually decline from embryonic day 16 (E16) to adulthood in mouse hippocampus .

• Cellular localization studies: Employ immunofluorescence with ADH5 antibodies to examine subcellular localization in neural stem cells versus differentiated neurons.

• Gain-of-function experiments: After overexpressing ADH5 in cultured hippocampal neurons or neural stem cells, use antibodies to confirm overexpression and evaluate effects on neurite outgrowth and differentiation markers .

• Loss-of-function studies: In ADH5 knockdown or knockout models, use antibodies against neuronal markers (like Tuj1 and MAP2) to assess the effects on neuronal differentiation and maturation .

• Co-immunoprecipitation: Use ADH5 antibodies for immunoprecipitation to identify protein-protein interactions that may mediate its effects on neuronal differentiation, such as interactions with HDAC2 .

• Chromatin immunoprecipitation: Combine ADH5 and HDAC2 antibodies in ChIP experiments to investigate epigenetic mechanisms underlying ADH5's role in neuronal development .

What approaches can be used to study the enzymatic activity of ADH5 in relation to protein S-nitrosation?

ADH5 functions as a denitrosation enzyme for HDAC2 and other S-nitrosated proteins . To investigate this activity:

• Biotin-switch technique: Use ADH5 antibodies in combination with the biotin-switch assay to detect changes in S-nitrosated protein levels after ADH5 manipulation.

• ADH5 inhibition studies: Treat cells with the ADH5 enzyme inhibitor C3, then use antibodies to analyze changes in S-nitrosated HDAC2 levels. Research shows that inhibition of ADH5 elevates S-nitrosated HDAC2 levels .

• Mutant ADH5 experiments: Compare the effects of wild-type ADH5 versus catalytically inactive mutant ADH5 (ADH5 mt, with arginine 115 mutated to aspartic acid) on S-nitrosation status of target proteins .

• Co-immunoprecipitation of S-nitrosated proteins: Use ADH5 antibodies to pull down ADH5 and associated proteins, then analyze for S-nitrosated binding partners.

• In vitro denitrosation assays: Purify ADH5 using immunoprecipitation with ADH5 antibodies, then test its denitrosation activity on purified S-nitrosated HDAC2.

How can I investigate ADH5's role in human neural stem cell (hNSC) development?

To explore ADH5's function in human neural stem cells:

• Expression profiling: Use ADH5 antibodies to monitor protein expression during hNSC differentiation. Research shows approximately 20-fold down-regulation of ADH5 mRNA in hNSC-derived neurons compared to undifferentiated hNSCs .

• Overexpression studies: After lentiviral overexpression of ADH5 in hNSCs, use antibodies against hNSC markers (Sox2, Nestin) and neuronal markers (Tuj1) to assess effects on stemness and differentiation .

• Migration assays: Employ ADH5 antibodies to confirm overexpression in migration studies, as research indicates that ADH5 overexpression compromises the migration ability of hNSCs .

• Pharmacological inhibition: Treat hNSCs with ADH5 inhibitors (like C3) and use antibodies to analyze changes in differentiation capacity and neuronal marker expression .

• S-nitrosation analysis: Combine ADH5 and HDAC2 antibodies to investigate the relationship between ADH5 levels, HDAC2 S-nitrosation, and neuronal differentiation in human cells .

What are common issues when using ADH5 antibodies and how can they be resolved?

When working with ADH5 antibodies, researchers may encounter several technical challenges:

• High background in immunostaining:

  • Solution: Optimize blocking conditions (try different blocking agents like BSA, normal serum, or commercial blockers)

  • Increase washing duration and number of washes

  • Titrate antibody concentration to determine optimal dilution

  • Pre-absorb the antibody with tissue homogenate from species of non-interest

• Weak or no signal in Western blot:

  • Solution: Confirm ADH5 expression in your sample (liver and colon have high expression)

  • Increase protein loading or antibody concentration

  • Extend primary antibody incubation time or temperature

  • Use more sensitive detection methods (enhanced chemiluminescence or fluorescence)

  • Try different antigen retrieval methods for fixed samples

• Multiple bands in Western blot:

  • Solution: Verify specificity using ADH5 knockout/knockdown controls

  • Check if bands represent isoforms (ADH5 has two known isoforms)

  • Optimize sample preparation to reduce protein degradation

  • Use freshly prepared samples and add protease inhibitors

• Cross-reactivity issues:

  • Solution: Select antibodies validated for your species of interest

  • Consider using monoclonal antibodies for higher specificity

  • Perform blocking experiments with recombinant ADH5 protein

How can I validate the specificity of ADH5 antibodies for my research?

Validating antibody specificity is crucial for reliable research results. For ADH5 antibodies, consider these validation approaches:

• Genetic controls: Use samples from ADH5 knockout animals or cells with CRISPR-mediated ADH5 deletion as negative controls .

• RNAi controls: Compare samples with and without ADH5 knockdown by RNA interference to confirm antibody specificity .

• Overexpression controls: Test antibody reactivity in cells overexpressing ADH5 versus empty vector controls.

• Peptide competition: Pre-incubate the antibody with the immunizing peptide before application to samples; specific signal should be blocked.

• Multiple antibody comparison: Use different antibodies targeting distinct epitopes of ADH5 and compare staining patterns.

• Correlation with mRNA expression: Compare antibody staining intensity with ADH5 mRNA levels measured by RT-PCR across multiple tissues.

• Western blot analysis: Confirm the antibody detects a protein of the expected molecular weight (approximately 39.1 kDa for ADH5) .

How can ADH5 antibodies be used to investigate the relationship between ADH5 and HDAC2 in epigenetic regulation?

Recent research has uncovered that ADH5 serves as a denitrosation enzyme for HDAC2, suggesting an important role in epigenetic regulation . To explore this relationship:

• Co-immunoprecipitation: Use ADH5 antibodies to pull down ADH5 and associated proteins, then probe for HDAC2 to confirm their interaction.

• Proximity ligation assay: Employ ADH5 and HDAC2 antibodies in proximity ligation assays to visualize and quantify their interaction in situ.

• ChIP-seq analysis: Use ChIP-seq with both ADH5 and HDAC2 antibodies to identify genomic regions where both proteins co-localize and potentially regulate gene expression.

• Sequential ChIP (Re-ChIP): Perform sequential immunoprecipitation with ADH5 and HDAC2 antibodies to identify genomic regions bound by both proteins simultaneously.

• HDAC2 activity assays: After manipulating ADH5 levels (overexpression or knockdown), use HDAC2 antibodies to immunoprecipitate HDAC2 and measure its enzymatic activity.

• S-nitrosation analysis: Combine biotin-switch technique with ADH5 and HDAC2 antibodies to investigate how ADH5 levels affect HDAC2 S-nitrosation status .

• Drug inhibition studies: Use ADH5 inhibitors like C3 to determine how ADH5 enzymatic activity affects HDAC2 S-nitrosation and subsequent gene regulation .

What are the considerations for multiplexing ADH5 antibodies with other markers in neuronal development studies?

When designing multiplex experiments to study ADH5 in neuronal development:

• Antibody compatibility: Select ADH5 antibodies raised in different host species than antibodies against other markers to avoid cross-reactivity in secondary detection.

• Marker selection: Choose appropriate markers based on developmental stage:

  • Neural stem cell markers: Sox2, Pax6, Nestin, Ki67

  • Neuronal differentiation markers: Tuj1, MAP2

  • Glial markers: GFAP, S100β, Olig2

  • Synapse markers: Synapsin, PSD-95

• Fluorophore selection: Choose fluorophores with minimal spectral overlap for multiplex fluorescence imaging:

  • Consider brightness, photostability, and detection sensitivity

  • ADH5 antibodies are available conjugated to various fluorophores including FITC, Alexa Fluor dyes, and APC-Cy7

• Sequential staining: For antibodies raised in the same species, consider sequential staining protocols with intermediate blocking steps.

• Controls: Include appropriate controls for each marker and test for bleed-through between channels.

• Analysis considerations:

  • Use quantitative image analysis to measure co-localization or expression correlations

  • Account for subcellular localization differences (ADH5 is cytoplasmic while many neuronal markers are membrane-associated)

How might ADH5 antibodies contribute to understanding neurodegenerative disorders?

Given ADH5's role in neuronal differentiation and its connection to epigenetic regulation through HDAC2 denitrosation , ADH5 antibodies could be valuable tools for investigating neurodegenerative disorders:

• Expression analysis in disease models: Use ADH5 antibodies to compare expression levels in brain tissues from neurodegenerative disease models versus healthy controls.

• Cellular stress response: Investigate ADH5's potential role in neuronal responses to oxidative and nitrosative stress, which are implicated in neurodegenerative diseases.

• Adult neurogenesis: Given that ADH5 negatively regulates neuronal differentiation , examine how ADH5 levels correlate with impaired adult neurogenesis in aging and neurodegenerative conditions.

• Therapeutic target validation: Use ADH5 antibodies to confirm target engagement in studies evaluating ADH5 inhibitors as potential therapeutics for enhancing adult neurogenesis.

• Biomarker development: Explore whether ADH5 levels in cerebrospinal fluid or blood correlate with disease progression using sensitive immunoassays.

• Protein aggregation: Investigate potential interactions between ADH5 and disease-associated protein aggregates using co-immunoprecipitation and co-localization studies.

What novel techniques are emerging for studying ADH5 function beyond traditional antibody applications?

While antibodies remain essential tools, emerging technologies can complement traditional antibody applications for studying ADH5:

• CRISPR-Cas9 genome editing: Generate ADH5 knockout or knock-in cell lines and animal models for functional studies, using antibodies for validation .

• ADH5-GFP fusion proteins: Create fluorescently tagged ADH5 constructs for live-cell imaging of ADH5 dynamics, with antibody validation of construct functionality .

• Mass spectrometry-based proteomics: Combine immunoprecipitation with mass spectrometry to identify novel ADH5 interaction partners and post-translational modifications.

• Single-cell technologies: Use ADH5 antibodies in single-cell Western blot or CyTOF mass cytometry to analyze ADH5 expression in heterogeneous cell populations.

• Biosensors: Develop FRET-based biosensors to monitor ADH5 enzymatic activity or protein-protein interactions in real-time.

• Spatial transcriptomics: Correlate ADH5 protein localization (by immunostaining) with spatial gene expression patterns in tissues.

• Protein-fragment complementation assays: Study ADH5 interactions with proteins like HDAC2 using split-fluorescent or split-luciferase constructs, validated with co-immunoprecipitation using antibodies.