Immunohistochemistry (IHC) and Immunofluorescence (IF) Service: Visualizing the Cellular Landscape
In the pursuit of understanding complex biological systems, the ability to visualize protein expression, distribution, and interaction within the context of tissue morphology is indispensable. Immunohistochemistry (IHC) and Immunofluorescence (IF) stand as the gold standards for in situ protein detection.
While both techniques rely on the specificity of antigen-antibody interactions, they offer distinct advantages depending on the experimental goal—whether it be diagnostic pathology or high-resolution subcellular localization.
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- Comparison
- Workflow
- Our service
- Trouble shooting guide
Comparative Analysis: Selecting the Right Technique
| Feature | Immunohistochemistry (IHC) | Immunofluorescence (IF) |
|---|---|---|
| Detection Type | Chromogenic (visible color change) | Fluorescent (emitted light) |
| Microscopy | Standard Brightfield | Fluorescence |
| Best For | Morphological context and pathology | Subcellular resolution and multiplexing |
| Multiplexing | Generally limited | High (multiple targets simultaneously) |
| Stability | High (permanent record/years) | Susceptible to photobleaching/fading |
| Quantitation | Semi-quantitative | High potential for semi-quantitative analysis |
Workflow
Our IHC & IF Services
1. Comprehensive Sample Support
- Tissue Preparation: Expert staining for both FFPE and Frozen tissue sections.
- Cellular Imaging: Support for Cell Smears and immunocytochemistry on cultured cells.
- Broad Species Range: Optimized protocols for Human, Mouse, Rat, and Plant tissues.
2. Flexible Antibody Solutions
- Antibody Sourcing: We accept client-provided antibodies or offer expert antibody selection and procurement.
- Assay Optimization: Rigorous Antibody Validation, titration, and Antigen Retrieval (HIER/Enzymatic) optimization for every target.
3. Advanced Multiplexing & Analysis
- Multiplex IF: Simultaneous detection of multiple targets using distinct spectral profiles.
- Spatial Analysis: Specialized Co-localization and subcellular localization analysis (e.g., nuclear vs. cytosolic).
4. Publication-Ready Deliverables
- High-Impact Figures: High-resolution, high-contrast images optimized for direct use in journal publications.
- Quantitative Reports: Detailed Semi-Quantitative Analysis and comprehensive technical reports including all optimized protocols.
- Beyond Staining: We seamlessly integrate your results with spatial multi-omics analyses (transcriptomics, proteomics, etc.), transforming stained samples into comprehensive spatial biology insights.
Troubleshooting Guide: Optimizing Your IHC & IF Staining
Even with robust protocols, unexpected results can occur. Use this diagnostic guide to identify common issues in Immunohistochemistry (IHC) and Immunofluorescence (IF) and find the appropriate solution.
Many of the challenges listed below are the most common reasons our clients outsource IHC/IF projects to us.
Problem 1: No Signal or Weak Signal
The tissue is visible, but the specific staining is absent or significantly fainter than expected.
| Possible Cause | Solution |
|---|---|
| Primary Antibody Incompatibility | Verify that the primary antibody is validated for the specific application (IHC vs. IF) and the species of the tissue sample. |
| Epitope Masking | The fixation process may have masked the antigen. Increase the time or temperature of Heat-Induced Epitope Retrieval (HIER) or switch to a different retrieval buffer (e.g., Citrate pH 6.0 vs. Tris-EDTA pH 9.0). |
| Antibody Concentration | The antibody titer may be too low. Perform a titration experiment to determine the optimal concentration. |
| Permeabilization (IF/IHC) | For intracellular targets, ensure adequate permeabilization (e.g., Triton X-100) was performed to allow antibody access. |
Problem 2: High Background Staining
The specific signal is obscured by generalized, non-specific staining across the tissue.
| Possible Cause | Solution |
|---|---|
| Inadequate Blocking | Ensure the blocking step uses serum from the same species as the secondary antibody host. Extend the blocking time (e.g., 30–60 mins at RT). |
| Endogenous Activity (IHC) | Tissues rich in peroxidase (kidney, liver) can cause background in HRP systems. Ensure adequate quenching with hydrogen peroxide prior to staining. |
| Antibody Concentration | The primary or secondary antibody concentration is too high. Dilute the antibody further. |
| Dry Tissue Sections | Never allow slides to dry out during the staining process, as this causes non-specific binding of reagents. |
Problem 3: Non-Specific or Unexpected Localization
Staining appears in the wrong cellular compartment (e.g., nuclear stain appearing in cytoplasm).
| Possible Cause | Solution |
|---|---|
| Cross-Reactivity | The secondary antibody may be binding to endogenous immunoglobulins in the tissue. Use a secondary antibody pre-adsorbed against the tissue species. |
| Autofluorescence (IF) | Natural tissue components (collagen, elastin, RBCs) can fluoresce. Include an unstained control slide to identify autofluorescence. Consider using dyes to quench autofluorescence (e.g., Sudan Black B). |
| Over-Fixation | Excessive fixation can alter protein conformation, leading to non-specific binding. Optimize fixation time (typically 10–20 mins for IF on cultured cells; 24h for formalin-fixed tissue). |
