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XDH / Xanthine dehydrogenase/oxidase · IHC design guide
Design Immunohistochemistry for XDH
Plan XDH chromogenic IHC in paraffin sections using lactating glandular cells as a medium-staining reference (HPA tissue IHC). The guide covers fixation consistency, antibody dilution, and scoring cytoplasmic staining alongside plasma positivity (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
XDH Immunohistochemistry Experimental Design Guide
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before staining
| Expected localisation | Cytoplasmic staining with plasma positivity in lactating breast (HPA tissue IHC) | |
| Staining pattern | Lactating glandular cells: cytoplasmic, with plasma positivity (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A01884-2) | |
| Positive control | Lactating breast | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific) | |
| Caveat | Plasma positivity may complicate cell-based scoring (HPA tissue IHC) | |
| Regulation | Medium staining in lactating glandular cells (HPA tissue IHC) | |
| Isoform / epitope | No annotated isoforms; one full-length chain, no TM segment (UniProt) |
Section 1
Recommended XDH IHC & IF Protocols
The catalog antibody’s IHC-P protocol (datasheet A01884-2) is accompanied by published XDH protocols for urothelial carcinoma, chicken liver, and HCC liver (PMC13309574; PMC10770749; PMC5623907).
| Sample | Paraffin-embedded human colon adenocarcinoma tissue; fixative not specified (datasheet A01884-2) |
| Fixation | Image fixative and duration unreported (datasheet A01884-2); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: EDTA pH 8.0 (datasheet A01884-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A01884-2) |
| Primary antibody | Rabbit anti-XDH, 2-5 μg/ml (datasheet A01884-2) |
| Primary incubation | Overnight at 4 °C (datasheet A01884-2) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A01884-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | XDH-positive staining in lactating glandular cells of lactating breast (HPA tissue IHC: Medium). HPA tissue profile: Cytoplasmic expression with additional plasma positivity in lactating breast. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for the catalog antibody (datasheet A01884-2). The urothelial and chicken studies report retrieval without specifying conditions (PMC13309574; PMC10770749).
Section 2
What Is the Expected XDH Staining Pattern?
In paraffin-section IHC, expect XDH mainly in the cytoplasm of lactating breast glandular cells, with additional plasma positivity (HPA tissue IHC: Medium; Supported). Low staining is reported in enterocytes and kidney tubule cells (HPA tissue IHC: Low). XDH has no transmembrane segment, consistent with an intracellular pattern (UniProt P47989 topology). HPA’s Supported rating carries a caveat: no tissue staining or RNA data were available for comparison (HPA tissue IHC).
| Cytoplasmic staining in lactating breast glandular cells, with plasma positivity. | This matches the reported IHC pattern; assess glandular-cell staining separately from plasma signal (HPA tissue IHC: Medium; cytoplasmic expression with additional plasma positivity). |
| Predominantly nuclear staining in a paraffin section. | This differs from the reported tissue IHC pattern and warrants a specificity check (HPA tissue IHC: cytoplasmic). ICC-IF reports uncertain nucleoplasmic and nucleolar localization, so nuclear signal alone cannot establish an artefact (HPA subcellular: uncertain). |
| Strong staining in adipocytes or another cell type reported as undetected. | This conflicts with the listed IHC observations; cross-reactivity or detection-system activity is possible and should be checked with controls (HPA tissue IHC: adipocytes, Not detected; general IHC practice). |
| Diffuse chromogen across cells and surrounding tissue, obscuring cell boundaries. | Treat this as background until a control localizes its source; it cannot be scored as the reported cytoplasmic glandular-cell pattern (HPA tissue IHC; general IHC practice). |
| No glandular-cell signal in lactating breast. | This misses the reported positive reference (HPA tissue IHC: Medium). Check section identity, tissue preservation and the detection run before interpreting the sample as XDH-negative (general IHC practice). |
💡Expected XDH appearanceCall a section positive when lactating breast glandular cells show medium cytoplasmic staining, allowing the reported plasma positivity; isolated strong adipocyte staining is discordant (HPA tissue IHC: Medium in lactating glandular cells; adipocytes Not detected).
| Tissue and cell selection | Lactating breast glandular cells offer the reported medium-level reference; enterocytes and kidney tubule cells are low-level references, while listed adipocytes are undetected (HPA tissue IHC). Choose comparison regions by cell type, since a tissue name alone does not specify which cells should stain (general IHC practice). |
| Localization and topology | Tissue IHC describes cytoplasmic expression plus plasma positivity in lactating breast (HPA tissue IHC). XDH is annotated as cytoplasmic, peroxisomal and secreted, with no transmembrane segment (UniProt P47989); these annotations do not establish a membrane-staining criterion. |
| Antibody evidence | HPA062641 has Supported IHC status; HPA069323 has no listed IHC status (HPA antibodies). HPA’s tissue reliability is also Supported, with no tissue staining or RNA data available for comparison (HPA tissue IHC). Neither label establishes that every reagent will reproduce the pattern. |
| IF/ICC Q&A: should nuclear fluorescence override the IHC pattern? | No. HPA ICC-IF places XDH mainly in the nucleoplasm and additionally in nucleoli, both marked uncertain (HPA subcellular). Record that discrepancy and evaluate IHC against the reported cytoplasmic tissue pattern (HPA tissue IHC); this is an interpretation note, not an IF protocol. |
| Chromogenic detection background | Endogenous enzyme activity can contribute chromogen when an enzyme-based detection system is used (general IHC practice). A detection control can distinguish that contribution from antibody-dependent staining; HPA does not attribute its XDH tissue pattern to endogenous detection activity (HPA tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| Lactating breast glandular cells are unstained. | The reference should have medium staining (HPA tissue IHC); an unsuccessful staining run or incorrect section identification is possible (general IHC practice). | Confirm the section and glandular cells, then review reagent controls and the run record before calling XDH absent (general IHC practice). |
| Only low staining appears in enterocytes or kidney tubule cells. | Low staining is the reported level in these cells (HPA tissue IHC: Low); weak signal here alone does not show assay failure. | Compare with lactating breast glandular cells, reported at medium intensity, and score the relevant cells separately (HPA tissue IHC: Medium; general IHC practice). |
| Adipocytes stain strongly. | Adipocytes are listed as not detected (HPA tissue IHC). Cross-reactivity or detection background is possible, but the staining alone does not identify its source (general IHC practice). | Inspect cell identity and compare antibody-omission and detection controls; investigate persistent antibody-dependent staining (general IHC practice). |
| Predominantly nuclear staining appears in IHC. | It conflicts with the cytoplasmic tissue IHC profile (HPA tissue IHC), although HPA’s ICC-IF nuclear locations are marked uncertain (HPA subcellular). | Check controls and repeat assessment with an IHC-supported antibody where available; report the compartment discrepancy rather than assigning it XDH specificity from location alone (HPA antibodies: HPA062641 Supported; general IHC practice). |
| Diffuse chromogen obscures the glandular-cell pattern. | Nonspecific detection signal or endogenous enzyme activity is possible with chromogenic IHC (general IHC practice); HPA reports a cell-associated cytoplasmic pattern (HPA tissue IHC). | Review an antibody-omission control and the detection system’s background controls, then score only interpretable cellular staining (general IHC practice). |
| Plasma signal accompanies glandular staining in lactating breast. | Additional plasma positivity is part of the reported pattern (HPA tissue IHC); UniProt also lists XDH as secreted (UniProt P47989). | Record plasma and glandular-cell staining separately; use the reported cytoplasmic glandular-cell signal for the cellular call (HPA tissue IHC; general IHC practice). |
Experiment evidence
IHC & IF images showing XDH staining
A01884-2 · IHCIHC analysis of XDH using anti-XDH antibody (A01884-2). XDH was detected in a paraffin-embedded section of human colon adenocarcinoma tissue
A01884-2 · IHCIHC analysis of XDH using anti-XDH antibody (A01884-2). XDH was detected in a paraffin-embedded section of human colon tissue. Heat mediated
M01884-2 · IHCIHC analysis of Xanthine Oxidase using anti-Xanthine Oxidase antibody (M01884-2). Xanthine Oxidase was detected in a paraffin-embedded secti
M01884-2 · IHCIHC analysis of Xanthine Oxidase using anti-Xanthine Oxidase antibody (M01884-2). Xanthine Oxidase was detected in a paraffin-embedded secti
A01884 · IHCIHC analysis of Xanthine Oxidase using anti-Xanthine Oxidase antibody (A01884). Xanthine Oxidase was detected in paraffin-embedded section o
A01884 · IHCIHC analysis of Xanthine Oxidase using anti-Xanthine Oxidase antibody (A01884). Xanthine Oxidase was detected in paraffin-embedded section o
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000158125-XDH/tissue/cerebral+cortex#imid_18245063
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000158125-XDH/tissue/colon#imid_18268173
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000158125-XDH/tissue/liver#imid_18268174
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000158125-XDH/tissue/kidney#imid_18268175
![HPA ICC-IF BJ [Human fibroblast] — XDH (HPA062641)](https://images.proteinatlas.org/62641/1527_F5_1_blue_red_green.jpg)
HPA · ICC-IF BJ [Human fibroblast]Human Protein Atlas immunofluorescence, BJ [Human fibroblast], antibody HPA062641; green = XDH, blue = nucleus, red = microtubules.
![HPA ICC-IF BJ [Human fibroblast] — XDH (HPA062641)](https://images.proteinatlas.org/62641/1527_F5_2_blue_red_green.jpg)
HPA · ICC-IF BJ [Human fibroblast]Human Protein Atlas immunofluorescence, BJ [Human fibroblast], antibody HPA062641; green = XDH, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for XDH IHC & IF
🧪Run lactating breast first: lactating glandular cells should stain (HPA: Medium in lactating glandular cells). Use adipose tissue as a negative comparison (HPA: Not detected in adipocytes); on the positive slide, assess neighboring nonglandular cells for background staining without assuming they are XDH-negative (HPA: lactating glandular cells only).
Positive control tissue: Lactating breast (Lactating glandular cells, HPA Medium)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show XDH in BJ [Human fibroblast], U-251MG, U2OS, with annotated localisation: Nucleoplasm (uncertain) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control and a concentration-matched rabbit IgG control matched to the primary antibody’s clonality (caption: rabbit anti-XDH primary); an XDH-knockout specimen, if available, provides a biological negative. Quench endogenous peroxidase and check background on the lactating breast section before HRP/DAB detection (caption: HRP/DAB detection; standard IHC practice).
⚠️Feasibility: The exact A01884-2 paraffin-section caption does not report a fixative, and the supplied evidence reports no XDH-specific fixation window or fixation effect (caption: fixative not stated). EDTA retrieval at pH 8.0 is a documented starting condition, but retrieval dependence is unreported (caption: heat-mediated EDTA retrieval). There is no matched evidence that frozen sections or IF are easier; luminal signal may complicate cell-level scoring because XDH is reported as secreted and detected in milk (UniProt P47989: localization and tissue specificity).
HPA tissue IHC evidence for XDH
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Supported — No tissue staining or RNA expression data available for comparison.). Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Lactating breast | Lactating glandular cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | Endocrine cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced XDH IHC Tips
Troubleshoot XDH staining in paraffin sections by checking retrieval, controls, compartment, and cell identity before interpreting chromogenic signal.
How should I adjust retrieval when XDH staining is weak or uneven?
Start with heat-mediated antigen retrieval in EDTA at pH 8.0 for paraffin sections (datasheet A01884-2). The selected tissue image used this retrieval before incubation with 2 μg/ml catalog antibody overnight at 4°C, so keep antibody conditions consistent while assessing retrieval (caption A01884-2). If staining remains weak, compare longer and shorter heating on adjacent sections while keeping cooling, detection, and development consistent (standard IHC practice). If that controlled comparison fails, test an alternative retrieval buffer as a fallback, using a positive tissue control and a no-primary control to distinguish improved XDH signal from increased background (standard IHC practice).
Could fixation explain weak XDH staining in paraffin sections?
The selected image documents a paraffin-embedded section but does not state its fixative, so target-specific fixation sensitivity is unknown (caption A01884-2). Record the actual fixative and fixation duration for each specimen, then compare similarly processed sections with the same EDTA pH 8.0 retrieval and detection settings (datasheet A01884-2; standard IHC practice). Variable fixation can alter tissue morphology and antigen accessibility, making a matched positive control useful when assessing weak staining (standard IHC practice). Do not assign a particular fixation effect to XDH from its annotated localisation or lack of glycosylation sites; neither establishes fixation sensitivity (UniProt P47989).
Which XDH staining compartments should I expect, and how should I assess nuclear signal?
Assess cytoplasmic staining first: the tissue IHC profile describes cytoplasmic expression with additional plasma positivity in lactating breast (HPA tissue IHC). UniProt also annotates cytoplasmic, peroxisomal, and secreted localisation, with no transmembrane segment, so a continuous membrane rim needs independent verification (UniProt P47989). Nuclear staining deserves a separate control check because the HPA ICC/IF nucleoplasm and nucleoli assignments are marked uncertain and come from a different application (HPA subcellular). Compare compartment patterns within intact cells and across a matched positive section, and inspect no-primary controls before calling isolated nuclear chromogen specific (standard IHC practice).
Can epitope location or XDH processing explain inconsistent IHC staining?
The record lists one chain spanning residues 1–1333, 0 annotated isoforms, and no signal peptide or propeptide (UniProt P47989). It also lists 0 glycosylation sites and no transmembrane segment, but these annotations do not identify the catalog antibody’s epitope (UniProt P47989; caption A01884-2). Ask for its immunogen or epitope information before attributing a compartment-specific loss of staining to epitope masking (standard IHC practice). Compare sections retrieved with the documented EDTA pH 8.0 method alongside matched controls, and avoid interpreting staining differences as isoform-specific without independent evidence (datasheet A01884-2; standard IHC practice).
How can I investigate XDH localisation by IF alongside the IHC result?
For a separate IF experiment, pair XDH with a marker identifying the expected cell population, such as lactating glandular cells, and inspect overlap at single-cell resolution (HPA tissue IHC; standard IF practice). Choose spectrally separated fluorophores and favor a longer-wavelength XDH channel if the specimen shows strong short-wavelength autofluorescence; include single-label and no-primary controls (standard IF practice). XDH has no annotated transmembrane segment and has intracellular localisation annotations, but the catalog antibody’s epitope is unspecified, so optimise permeabilisation for epitope access without assuming a membrane-facing side (UniProt P47989; caption A01884-2). Treat the reported nucleoplasm and nucleoli IF locations as uncertain when comparing them with cytoplasmic tissue IHC staining (HPA subcellular; HPA tissue IHC).
What should I check when DAB staining obscures XDH-positive cells?
Check a no-primary section for chromogen deposition, then assess endogenous peroxidase blocking and DAB development time before changing the primary antibody concentration (standard IHC practice). The selected image used 10% goat serum blocking, 2 μg/ml primary antibody overnight at 4°C, and a peroxidase-conjugated secondary for 30 minutes at 37°C (caption A01884-2). Excess diffuse signal after those steps warrants titrating primary concentration and reviewing wash and blocking conditions on matched sections (standard IHC practice). Evaluate cellular cytoplasmic staining separately from precipitate, tissue edges, and necrotic areas, which can distort chromogenic interpretation (HPA tissue IHC; standard IHC practice).
How should I score XDH IHC across specimens with different tissue composition? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring; the tissue IHC profile reports cytoplasmic expression and medium staining in lactating glandular cells (HPA tissue IHC). Within viable, evaluable cells, record percentage positive and intensity, or calculate an H-score as the sum of each intensity category’s percentage multiplied by its score (standard IHC practice). Normalise positive-cell counts or stained area to the number of eligible cells or eligible tissue area, such as cells per mm², rather than total slide area (standard IHC practice). Apply identical thresholds and imaging conditions across sections, and report plasma-associated staining separately from cellular staining in lactating breast (HPA tissue IHC; standard IHC practice).
How can I distinguish genuine XDH signal from misleading chromogenic staining?
A credible result should show a coherent cellular pattern, with cytoplasmic staining supported by tissue IHC and possible plasma positivity in lactating breast (HPA tissue IHC). Compare suspected positive cells with the expected tissue context: lactating glandular cells have reported medium staining, whereas breast adipocytes are reported as not detected (HPA tissue IHC). Treat edge-restricted colour, necrotic deposits, and staining reproduced in a no-primary control as possible artefacts, including endogenous peroxidase signal (standard IHC practice). Verify unexpected membrane or exclusively nuclear staining independently, because XDH has no transmembrane segment and the reported nuclear ICC/IF locations are uncertain (UniProt P47989; HPA subcellular).
Boster reagents
Best XDH / Xanthine dehydrogenase/oxidase IHC Antibodies
Three human-, mouse-, and rat-reactive anti-XDH antibodies have real paraffin-section IHC images from human colon adenocarcinoma, mouse small intestine, and mouse intestine (catalog reactivity; respective SKU image captions).
Real IHC data
Anti-XDH Antibody ®
Cat # A01884-2
Real IHC data
Anti-Xanthine Oxidase Rabbit Monoclonal Antibody
Cat # M01884-2
Real IHC data
Anti-Xanthine Oxidase/XDH Antibody ®
Cat # A01884
A01884-2 shows IHC in human colon adenocarcinoma, human colon, liver cancer, and thyroid papillary carcinoma; M01884-2 shows IHC in mouse and rat small intestine (respective SKU image captions). A01884 shows IHC in mouse and rat intestine and is listed for IHC-F and ICC, with no IF image supplied (A01884 image captions; catalog applications and image listings).
Which to pick: For human paraffin-section IHC, choose A01884-2: its human tissue images use EDTA retrieval at pH 8.0 and 2 μg/ml antibody (A01884-2 image captions). For mouse or rat intestinal IHC, M01884-2 is a monoclonal with images using EDTA retrieval and 1:50 antibody; A01884 instead has intestinal images using citrate retrieval at pH 6 (M01884-2 catalog clone and image captions; A01884 image captions). For ICC, choose A01884 because ICC is listed at 0.5–1 μg/ml; all three list human, mouse, and rat reactivity, and none of their paraffin-section captions reports the fixative (A01884 catalog applications and dilution; catalog reactivity; respective SKU image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P47989 (XDH_HUMAN, Xanthine dehydrogenase/oxidase).
- Human Protein Atlas. XDH tissue IHC expression (reliability: Supported).
- Human Protein Atlas. XDH subcellular location (ICC-IF): Mainly localized to the nucleoplasm. In addition localized to the nucleoli..
- Human Protein Atlas. XDH antibody validation summary (2 antibodies).
- Xanthine dehydrogenase rewires metabolism and the survival of nutrient deprived lung adenocarcinoma cells by facilitating UPR and autophagic degradation. International journal of biological sciences 2023 — PMC9909990.
- Exploring XDH expression as a prognostic marker for urothelial carcinoma. Discover oncology 2026 — PMC13309574.
- Screening of heat stress-related biomarkers in chicken serum through label-free quantitative proteomics. Poultry science 2024 — PMC10770749.
- Xanthine dehydrogenase downregulation promotes TGFβ signaling and cancer stem cell-related gene expression in hepatocellular carcinoma. Oncogenesis 2017 — PMC5623907.
- PubMed PMID:8224915 — UniProt-cited evidence.
- PubMed PMID:8135849 — UniProt-cited evidence.
- PubMed PMID:7575623 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for XDH (Xanthine dehydrogenase/oxidase). Expected localisation Cytoplasmic staining with plasma positivity in lactating breast (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A01884-2). Validated IHC antibody: A01884-2 at 2-5 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Lactating breast (Lactating glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human colon adenocarcinoma tissue; fixative not specified (datasheet A01884-2); 2. Fixation: Image fixative and duration unreported (datasheet A01884-2); verify before use.; 3. Sectioning: 4–5 µm sections on charged slides (standard); 4. Deparaffinisation: Xylene, graded ethanol series to water (standard); 5. Antigen retrieval: Heat retrieval: EDTA pH 8.0 (datasheet A01884-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A01884-2); 8. Primary antibody: Rabbit anti-XDH, 2-5 μg/ml (datasheet A01884-2); 9. Primary incubation: Overnight at 4 °C (datasheet A01884-2). Watch for: Fixation: Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific); Caveat: Plasma positivity may complicate cell-based scoring (HPA tissue IHC); Isoform / epitope: No annotated isoforms; one full-length chain, no TM segment (UniProt); Regulation: Medium staining in lactating glandular cells (HPA tissue IHC). Evidence: UniProt P47989, HPA tissue IHC · Supported, HPA ICC-IF · Mainly localized to the nucleoplasm. In addition localized to the…, Datasheet A01884-2, PMC13309574, PMC10770749. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/XDH/immunohistochemistry-ihc-guide.