The KLF12 Antibody, HRP conjugated, is a mouse monoclonal antibody (clone PCRP-KLF12-1E3) designed for direct detection of KLF12 in human samples. Key features include:
This antibody simplifies workflows by eliminating the need for secondary antibodies, making it ideal for high-throughput or rapid detection assays.
To contextualize the HRP-conjugated variant, a comparison with other KLF12 antibodies is provided:
The HRP-conjugated antibody is validated for:
Flow Cytometry: Direct staining of intracellular KLF12 in fixed/permeabilized cells .
Immunofluorescence: Visualization of nuclear KLF12 in HEK293 cells (e.g., R&D Systems’ antibody with secondary detection) .
Immunoprecipitation: Enrichment of KLF12 for downstream protein interaction studies .
Protein Array: High-throughput screening of KLF12 levels in lysates .
Non-HRP-conjugated antibodies (e.g., Abcam, Proteintech) require secondary antibodies for detection but are widely used in:
Western Blot: Detection of KLF12 in Jurkat, 293T, and HeLa cell lysates .
Chromatin Immunoprecipitation (ChIP): Identifying KLF12 binding sites (e.g., PD-L1 promoter in NSCLC) .
KLF12 antibodies have been pivotal in elucidating KLF12’s roles in:
Role: KLF12 inhibits FOXO1 expression, impairing implantation .
Methods: Western blot and immunohistochemistry in human endometrial tissues .
Role: KLF12 exacerbates angiotensin II-induced fibrosis via TGF-β/Smad3 signaling .
Methods: RNA-seq and Smad7 promoter analysis in murine models .
Role: KLF12 upregulates PD-L1 by recruiting P300 histone acetyltransferase .
Methods: ChIP assays and STAT1/STAT3 co-immunoprecipitation .
KLF12, also known as AP-2rep (AP-2 repressor) or HSPC122, is a member of the Krüppel-like factor family of transcription factors characterized by zinc finger DNA-binding domains. KLF12 functions primarily as a transcriptional repressor that binds to specific regulatory elements in target gene promoters . Its key biological functions include:
Strong transcriptional repression of the AP-2-alpha gene by binding to a regulatory element (A32) in the promoter region
Negative regulation of endometrial decidualization, a critical process for successful embryo implantation
Direct binding to the FOXO1 promoter region and inhibition of FOXO1 expression in human endometrial stromal cells
Involvement in the pathogenesis of repeated implantation failure, as evidenced by elevated KLF12 expression accompanied by decreased FOXO1 expression in patients with RIF
Impairment of embryo implantation and endometrial decidualization in mouse models, suggesting a crucial role in early pregnancy
The 44 kDa KLF12 protein is primarily localized in the nucleus, consistent with its role as a transcription factor regulating gene expression .
Selecting the right KLF12 antibody depends on your experimental application, target species, and specific requirements. Based on the available data, consider the following factors:
Application compatibility: Different antibodies are validated for specific applications. For example:
Species reactivity: Verify the antibody's reactivity with your species of interest:
Conjugation: Determine if you need a conjugated antibody:
Antibody format: Consider polyclonal versus monoclonal based on your experimental needs:
When designing critical experiments, it is advisable to validate antibody performance in your specific experimental system before conducting extensive studies.
Horseradish peroxidase (HRP) conjugation offers several advantages in immunodetection applications when working with KLF12 antibodies:
Direct detection: HRP-conjugated antibodies like bs-16783r-HRP eliminate the need for secondary antibody incubation, simplifying protocols and reducing background signal .
Enhanced sensitivity: HRP enzymatic activity provides signal amplification when used with appropriate substrates (luminol-based for chemiluminescence or DAB for colorimetric detection), potentially increasing detection sensitivity of KLF12 even at low expression levels.
Time efficiency: Direct conjugation reduces protocol time by eliminating secondary antibody incubation and washing steps, particularly beneficial in time-sensitive experiments.
Flexibility in detection methods: HRP-conjugated antibodies are compatible with:
Chemiluminescence detection (ECL) as demonstrated in the Western blot data for KLF12 detection in Jurkat, 293T, and HeLa cell lysates
Colorimetric detection using 3,3'-diaminobenzidine (DAB) for IHC applications
Tyramide signal amplification (TSA) for further enhancement of signal in low-abundance targets
Reduced cross-reactivity: Elimination of secondary antibodies reduces potential cross-reactivity issues in multi-labeling experiments.
The bs-16783r-HRP antibody specifically offers these advantages for Western blotting, IHC-P, and IHC-F applications with recommended dilutions of 1:500-2000 for WB and 1:100-500 for IHC applications .
Optimal Western blotting conditions for HRP-conjugated KLF12 antibody require careful consideration of sample preparation, electrophoresis parameters, and detection protocols. Based on the available data, the following recommendations can be made:
Sample preparation:
Use whole cell lysates from appropriate cell lines (Jurkat, 293T, HeLa showed successful detection)
Load appropriate protein amounts: 15-50 μg per lane appears effective
Include proper positive controls (Jurkat cells show good KLF12 expression)
Electrophoresis and transfer conditions:
Prepare for detection of the 44 kDa band (predicted molecular weight of KLF12)
Use standard SDS-PAGE separation (10% gel is typically suitable for this molecular weight)
Employ standard wet or semi-dry transfer protocols
Antibody incubation and detection:
For bs-16783r-HRP: Use at a dilution of 1:500-2000 in appropriate blocking buffer
For reference, unconjugated ab129459 was effective at 0.1 μg/mL concentration
Blocking buffer: TBS with 1% BSA is suitable based on the storage buffer composition
Incubation time: Typically overnight at 4°C or 1-2 hours at room temperature
Detection protocol:
Use ECL (Enhanced Chemiluminescence) substrates compatible with HRP
Expected exposure time: Reference data showed good results with 3-minute exposure
Buffer composition:
Storage buffer for bs-16783r-HRP contains 0.01M TBS (pH 7.4) with 1% BSA, 0.02% Proclin300, and 50% Glycerol
This suggests using TBS-based wash and incubation buffers
A representative Western blot protocol based on successful detection of KLF12 would include standard SDS-PAGE, transfer to PVDF or nitrocellulose membrane, blocking in TBS with 5% BSA, incubation with KLF12-HRP antibody (1:1000), washing in TBST, and ECL detection with 1-3 minute exposure time.
Optimizing KLF12 antibody performance for immunohistochemistry requires attention to several critical parameters:
Sample preparation and antigen retrieval:
Fixation: Standard 10% neutral buffered formalin fixation is suitable
Sectioning: 4-6 μm sections are typically appropriate for IHC
Antigen retrieval: For paraformaldehyde-fixed tissues, test both:
Heat-induced epitope retrieval (HIER) using citrate buffer (pH 6.0)
HIER using EDTA buffer (pH 9.0)
Blocking and antibody incubation:
Peroxidase blocking: 3% hydrogen peroxide for 10 minutes
Protein blocking: 5-10% normal serum (matched to secondary antibody species if using unconjugated primary)
Primary antibody dilution:
Detection optimization:
For HRP-conjugated antibody (bs-16783r-HRP):
Direct detection with DAB substrate (typically 5-10 minutes)
No secondary antibody required
Counterstaining: Hematoxylin for nuclear visualization (important for KLF12 which localizes to the nucleus)
Mounting: Use permanent mounting medium for long-term storage
Controls:
Positive tissue control: Endometrial tissue samples are appropriate based on KLF12's role in decidualization
Negative controls:
Primary antibody omission
Non-immune IgG at the same concentration as primary antibody
Tissues known to lack KLF12 expression
Troubleshooting weak or absent staining:
Increase antibody concentration (try 1:100 dilution)
Extend primary antibody incubation time (overnight at 4°C)
Test alternative antigen retrieval methods
Use signal amplification systems compatible with HRP
Troubleshooting high background:
Decrease antibody concentration (try 1:500 dilution)
Ensure thorough washing steps (3-5 washes, 5 minutes each)
Increase blocking time or concentration
Test alternative blocking reagents (BSA, casein, commercial blockers)
Based on KLF12's involvement in endometrial function, reproductive tissues provide relevant biological contexts for expression analysis and method optimization .
When encountering suboptimal performance with KLF12 antibodies, systematic troubleshooting can help identify and resolve issues:
Western Blot Issues:
No signal detected:
Verify KLF12 expression in your sample (Jurkat cells show good expression)
Check antibody dilution (try more concentrated, e.g., 1:500 for HRP-conjugated)
Confirm HRP activity by using a dot blot with direct ECL detection
Increase protein loading (50 μg of total protein per lane as shown in reference data)
Verify transfer efficiency using reversible protein stain
Multiple bands/non-specific binding:
Increase blocking time/concentration (use 5% BSA in TBS)
Optimize antibody dilution (try more dilute, e.g., 1:2000)
Add 0.1-0.5% Tween-20 to antibody dilution buffer
Increase wash stringency (more washes, longer duration)
Validate with KLF12 knockout/knockdown samples as negative controls
Incorrect molecular weight:
IHC Issues:
Weak or no staining:
Optimize antigen retrieval (test both citrate and EDTA buffers)
Reduce dilution (use 1:100 instead of 1:500)
Increase incubation time or temperature
Check for proper tissue fixation (overfixation can mask epitopes)
Verify antibody reactivity with your species (bs-16783r-HRP is confirmed for human, predicted for mouse)
High background:
Increase antibody dilution (use 1:500 instead of 1:100)
Enhance blocking (longer time, different blocking agents)
Add 0.1-0.3% Triton X-100 to reduce non-specific binding
Ensure thorough washing between steps
Immunoprecipitation Issues:
Poor pull-down efficiency:
Co-IP difficulties:
Test different lysis conditions to preserve protein-protein interactions
Use gentler wash conditions
Consider crosslinking approaches for transient interactions
Storage and Handling:
Store bs-16783r-HRP at -20°C in aliquots to avoid repeated freeze-thaw cycles
Follow storage buffer recommendations (TBS with BSA, Proclin300, and Glycerol)
Check antibody expiration date and storage conditions
Implementing these systematic approaches should resolve most technical issues with KLF12 antibody applications.
KLF12 antibodies provide valuable tools for investigating its critical role in reproductive biology, particularly in relation to implantation failure and decidualization. Based on the research data, several advanced experimental approaches can be employed:
Endometrial expression analysis in clinical samples:
IHC analysis comparing KLF12 expression in endometrial tissues from:
Normal fertile women across the menstrual cycle
Patients with repeated implantation failure (RIF)
Women with recurrent pregnancy loss
The bs-16783r-HRP antibody (1:100-500 dilution) is suitable for IHC-P and IHC-F applications
Research has already established elevated KLF12 expression in endometria of patients with RIF
Correlation with FOXO1 expression:
Dual immunostaining for KLF12 and FOXO1 to examine their inverse relationship
Western blot analysis of both proteins in patient samples
Research has demonstrated that elevated KLF12 expression is accompanied by decreased FOXO1 expression in RIF patients
Functional analysis in cellular models:
Transfection/transduction studies in human endometrial stromal cells (hESCs):
Western blotting with KLF12 antibodies to confirm expression changes
Analysis of KLF12-FOXO1 regulatory interaction:
Chromatin immunoprecipitation (ChIP) using KLF12 antibodies to confirm binding to the FOXO1 promoter region
Focus on the identified binding site: CAGTGGG element within the FOXO1 promoter
Reporter gene assays with wild-type and mutant FOXO1 promoter constructs
Animal models:
IHC analysis of KLF12 expression in mouse uterine tissues during early pregnancy
Western blot analysis of uterine tissues from hormone-primed mice
Reference data showed that increased KLF12 expression in mouse uterus repressed uterine decidualization
Quantitative approaches:
Densitometric analysis of Western blots to quantify KLF12 and FOXO1 levels
Image analysis of IHC staining intensity and distribution
Correlation analysis between KLF12 levels and clinical outcomes
These approaches allow comprehensive investigation of KLF12's role in reproductive failure, potentially leading to novel diagnostic or therapeutic strategies for implantation failure.
Investigating KLF12's transcriptional repression activity requires combining KLF12 antibodies with sophisticated molecular techniques to elucidate protein-DNA interactions and functional outcomes:
Chromatin Immunoprecipitation (ChIP) assays:
Use KLF12 antibodies to immunoprecipitate chromatin fragments containing KLF12 binding sites
PCR-amplify specific promoter regions (e.g., AP-2-alpha gene promoter, FOXO1 promoter)
ChIP-seq to identify genome-wide KLF12 binding sites
For KLF12-FOXO1 interaction, focus on the CAGTGGG element identified within the FOXO1 promoter (-2637 to -2601 bp)
Procedure refinement:
DNA-protein interaction analysis:
Electrophoretic mobility shift assays (EMSA) to confirm direct binding:
Avidin-biotin conjugate DNA precipitation (ABCD) assays:
Use biotinylated oligonucleotides based on target promoter sequences
Precipitate DNA-protein complexes with streptavidin beads
Detect KLF12 in complexes by Western blot
Reporter gene assays:
Construct luciferase reporters with wild-type and mutant promoters
Co-transfect with KLF12 expression vectors in appropriate cell lines
Measure transcriptional repression activity
Confirm KLF12 expression levels by Western blot
Analyze dose-dependent effects using multiple KLF12 concentrations
Proteomic approaches to identify co-repressors:
Immunoprecipitation with KLF12 antibodies followed by mass spectrometry
Co-immunoprecipitation to detect specific interactions with known co-repressors
Proximity ligation assays to visualize protein-protein interactions in situ
Functional validation in cellular models:
Manipulate KLF12 expression in relevant cell types (e.g., endometrial stromal cells)
Use adenoviral vectors for overexpression (MOI = 25 and 50, as in reference studies)
Measure target gene expression by qRT-PCR and Western blot
Referenced studies showed that KLF12 overexpression in hESCs resulted in significant dose-dependent decreases in FOXO1 mRNA and protein expression
For optimal results, use antibodies validated for the specific application (e.g., bs-16783r-HRP for Western blot detection of KLF12 in functional studies) .
Designing experiments to investigate KLF12-FOXO1 interactions in implantation failure requires a multi-level approach spanning molecular, cellular, and in vivo systems. Based on the available research data, a comprehensive experimental design would include:
1. Molecular level analysis:
Promoter binding and regulation studies:
ChIP-PCR targeting the FOXO1 promoter region:
Binding site mutation analysis:
Reporter gene assays with luciferase constructs:
2. Cellular level investigation:
Expression correlation studies:
Western blot analysis of KLF12 and FOXO1 in:
Primary endometrial stromal cells from control vs. RIF patients
Cell lines with manipulated KLF12 expression
Use validated antibodies:
Functional rescue experiments:
Decidualization assessment in endometrial stromal cells:
Measure decidualization markers (prolactin, IGFBP-1)
Assess morphological transformation
3. In vivo models:
Mouse model experiments:
Uterine-specific manipulation of KLF12:
Adenovirus-mediated overexpression in mouse uterus
Conditional knockout models
Artificial decidualization protocol:
Analysis methods:
Morphological assessment of deciduoma formation
Histological examination of uterine sections
IHC analysis of KLF12 and FOXO1 expression
Western blot quantification of protein levels
4. Translational clinical studies:
Patient sample analysis:
Endometrial biopsies from:
Fertile controls at mid-secretory phase
RIF patients at equivalent cycle phase
Analysis methods:
IHC for spatial distribution of KLF12 and FOXO1
Dual immunofluorescence to assess co-localization
Western blot for quantitative expression analysis
qRT-PCR for mRNA levels
Expression correlation with clinical outcomes:
Prospective study of KLF12 levels in endometrial biopsies
Correlation with:
Subsequent implantation success/failure
Pregnancy outcomes
Number of failed IVF cycles
5. Data analysis and integration:
| Experimental Approach | Parameters Measured | Expected Results in RIF |
|---|---|---|
| Western Blot | KLF12 and FOXO1 protein levels | ↑ KLF12, ↓ FOXO1 |
| qRT-PCR | KLF12 and FOXO1 mRNA expression | ↑ KLF12, ↓ FOXO1 |
| ChIP-PCR | KLF12 binding to FOXO1 promoter | ↑ Enrichment at CAGTGGG element |
| Reporter Assays | Luciferase activity | ↓ Activity with ↑ KLF12 |
| Decidualization Assays | Prolactin, IGFBP-1 levels | ↓ Markers with ↑ KLF12 |
| Mouse Models | Deciduoma formation | ↓ Formation with ↑ KLF12 |
| IHC Analysis | Protein localization | Nuclear KLF12, ↓ FOXO1 |
This comprehensive experimental design allows for thorough investigation of the KLF12-FOXO1 regulatory axis in implantation failure, potentially revealing new therapeutic targets for treating RIF.
Understanding the trade-offs between HRP-conjugated and unconjugated KLF12 antibodies is essential for optimal experimental design across different research contexts:
Advantages of HRP-conjugated KLF12 antibodies (e.g., bs-16783r-HRP):
Limitations of HRP-conjugated antibodies:
Reduced flexibility:
Fixed HRP reporter system without amplification options
Cannot switch detection systems without changing primary antibody
Limited to HRP-compatible detection methods
Potentially reduced sensitivity:
Storage considerations:
Advantages of unconjugated KLF12 antibodies (e.g., ab129459, ABIN2855792):
Detection flexibility:
Compatible with multiple secondary detection systems (HRP, AP, fluorescent conjugates)
Can switch between chromogenic and fluorescent workflows
Applicable across diverse imaging platforms
Signal amplification options:
Secondary antibody binding provides natural signal amplification
Compatible with biotinylated secondaries and avidin-biotin complexes for enhanced sensitivity
Titratable amplification by adjusting secondary antibody concentration
Dual-purpose utility:
Limitations of unconjugated antibodies:
Longer protocols:
Additional secondary antibody incubation (typically 1-2 hours)
More washing steps required
Increased hands-on time
Potential background issues:
Secondary antibody can introduce non-specific binding
Cross-reactivity concerns in multi-species samples or multiplexing experiments
More blocking optimization required
Context-specific recommendations:
| Experimental Context | Recommended Format | Rationale |
|---|---|---|
| Routine Western blotting | HRP-conjugated | Faster protocol, direct detection |
| Immunoprecipitation | Unconjugated | Better performance in solution-phase binding |
| Co-localization IHC/IF | HRP-conjugated | Avoids species cross-reactivity issues |
| Low abundance targets | Unconjugated | Better signal amplification options |
| Multi-application studies | Unconjugated | Greater experimental flexibility |
| Time-sensitive experiments | HRP-conjugated | Faster workflow, fewer steps |
When selecting between HRP-conjugated bs-16783r-HRP and unconjugated options like ab129459 or ABIN2855792 , researchers should carefully consider these advantages and limitations in relation to their specific experimental requirements, balancing convenience against flexibility and sensitivity needs.
Comprehensive investigation of KLF12-mediated transcriptional regulation requires integrating antibody-based detection with complementary molecular techniques to create a multi-dimensional analytical framework:
Integrated ChIP-seq and RNA-seq approach:
ChIP-seq for genome-wide binding:
Immunoprecipitate chromatin using KLF12 antibodies (ab129459 validated for IP)
Sequence precipitated DNA fragments to identify genome-wide binding sites
Bioinformatic analysis to identify enriched DNA motifs (e.g., CAGTGGG element)
Integrate with existing genomic databases and transcription factor binding sites
RNA-seq for expression consequences:
Integration analysis:
Cross-reference ChIP-seq binding sites with RNA-seq DEGs
Identify direct transcriptional targets with evidence of both binding and expression change
Pathway enrichment analysis of regulated gene networks
Multi-level protein-DNA-RNA analysis:
Sequential ChIP (Re-ChIP):
First IP with KLF12 antibody
Second IP with antibodies against co-repressors or histone modifiers
Identify genomic regions with co-occupancy
Western blot verification of protein interactions
CRISPR-based functional genomics:
Epigenetic analysis:
ChIP for histone modifications at KLF12 binding sites
DNA methylation analysis of target promoters (e.g., FOXO1)
Integrate with KLF12 binding data to understand regulatory mechanisms
Western blot for KLF12 expression correlation
Advanced protein interaction studies:
Proximity-dependent labeling:
Mass spectrometry integration:
Application to the KLF12-FOXO1 regulatory axis:
| Technique Combination | Scientific Question | Expected Outcome |
|---|---|---|
| ChIP-seq + RNA-seq | Identify all genes directly regulated by KLF12 | Genome-wide map of KLF12 binding sites correlated with expression changes |
| ChIP + DNA methylation | Examine epigenetic context of KLF12 binding | Correlation between KLF12 binding, methylation status, and gene expression |
| IP-MS + Co-IP | Identify KLF12 co-repressor complex components | Novel protein interactions involved in transcriptional repression |
| CRISPR editing + WB | Test necessity of CAGTGGG element in FOXO1 repression | Confirmation of direct regulatory mechanism |
| Single-cell RNA-seq + IHC | Examine cellular heterogeneity in KLF12-FOXO1 relationship | Cell-type specific regulatory patterns in reproductive tissues |
This integrated approach allows researchers to simultaneously address multiple aspects of KLF12-mediated transcriptional regulation, from genome-wide binding patterns to specific mechanistic questions about the KLF12-FOXO1 regulatory axis identified in implantation failure studies . The combination of antibody-based detection methods with complementary molecular techniques provides a comprehensive understanding that no single technique could achieve alone.
The continued development and application of KLF12 antibodies opens several promising avenues for future research in reproductive biology, particularly in understanding implantation failure and developing potential therapeutic approaches:
Advanced diagnostic applications:
Development of standardized IHC protocols using KLF12 antibodies for endometrial receptivity assessment
Exploration of KLF12 as a biomarker for repeated implantation failure prediction
Creation of multiplexed antibody panels combining KLF12 with FOXO1 and other decidualization markers
Integration with machine learning algorithms for automated tissue analysis and outcome prediction
Therapeutic target validation:
Using KLF12 antibodies to validate the efficacy of interventions targeting the KLF12-FOXO1 axis
Monitoring KLF12 expression changes in response to potential therapeutic compounds
Development of blocking peptides or aptamers targeting KLF12 binding sites
Evaluation of targeted epigenetic modifiers to regulate KLF12 expression
Single-cell and spatial analysis:
Application of KLF12 antibodies in single-cell protein analysis platforms
Integration with spatial transcriptomics to map KLF12 expression in the endometrial microenvironment
Multiplex immunofluorescence to study KLF12 co-localization with transcriptional cofactors
3D reconstruction of KLF12 distribution in the implantation site
Systems biology approaches:
Network analysis integrating KLF12 with other transcription factors in decidualization
Multi-omics approaches combining KLF12 antibody-based proteomics with transcriptomics and epigenomics
Temporal dynamics studies of KLF12 expression throughout the menstrual cycle and early pregnancy
Comparative studies across species to identify conserved KLF12 regulatory mechanisms
Clinical translation opportunities:
Development of non-invasive detection methods for KLF12 expression status
Creation of predictive models incorporating KLF12 levels for personalized reproductive medicine
Design of targeted interventions to modulate the KLF12-FOXO1 regulatory axis
Establishment of reference standards for KLF12 expression in normal versus pathological endometrium
These future directions build upon the established role of KLF12 as a negative regulator of endometrial decidualization and its association with implantation failure . The continued refinement of KLF12 antibodies, particularly HRP-conjugated variants with enhanced sensitivity and specificity, will be crucial for advancing these research areas and ultimately improving outcomes for patients experiencing reproductive challenges.