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AOC1 / Diamine oxidase [copper-containing] · IHC design guide
Design Immunohistochemistry for AOC1
Plan AOC1 staining in paraffin sections using the observed tissue pattern and positive tissues (HPA tissue IHC). This guide covers the catalog antibody's IHC conditions (datasheet PB10040) and the interpretation of staining from a secreted protein (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
AOC1 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 and membranous staining (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic and membranous signal in most cell types (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet PB10040) | |
| Positive control | Colon+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image PB10040) | |
| Caveat | Secreted AOC1 may appear away from expressing cells (HPA tissue IHC) | |
| Regulation | Expression regulation unreported (UniProt) | |
| Isoform / epitope | Two isoforms; epitope overlap is unspecified (UniProt) |
Section 1
Recommended AOC1 IHC & IF Protocols
The catalog antibody has an EDTA pH 8.0 IHC-P protocol (datasheet: PB10040). The four published AOC1 IHC protocols below report their own tissue preparation, staining and detection details (cited PMC methods).
| Sample | Paraffin-embedded human colonic adenoma tissue; fixative not specified (datasheet PB10040) |
| Fixation | Image fixative and duration unreported (datasheet PB10040); 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 PB10040); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet PB10040) |
| Primary antibody | Rabbit anti-AOC1, 2-5 μg/ml (datasheet PB10040) |
| Primary incubation | Overnight at 4 °C (datasheet PB10040) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet PB10040) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | AOC1-positive staining in glandular cells of colon (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic and membranous expression in most cell types. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for the catalog antibody (datasheet: PB10040); evaluate citrate pH 6.0 when adapting the colorectal or placental protocols (PMC8131869; PMC13438134).
Section 2
What Is the Expected AOC1 Staining Pattern?
AOC1 is secreted and associated with the cell membrane despite having no transmembrane segment (UniProt P19801 topology). In tissue IHC, expect cytoplasmic and membranous staining, especially in colon glandular cells and kidney tubule cells (HPA: cytoplasmic and membranous profile; High in both). HPA rates the tissue staining Approved but reports low consistency with RNA expression; secretion can separate the sites of RNA and protein (HPA: reliability description).
| Strong cytoplasmic and membranous stain in colon glands or kidney tubules. | This matches the most informative supplied positive patterns (HPA: High in colon glandular cells and kidney tubule cells). Judge the stained cells and compartments together; a dark area without recognizable cellular staining is less convincing. |
| Predominantly nuclear stain, with little cytoplasmic or membranous signal. | This does not match the reported tissue profile (HPA: cytoplasmic and membranous). Treat isolated nuclear staining as suspect and compare it with the no-primary control before assigning it to AOC1. The supplied sources establish no nuclear pattern. |
| Strong stain in cells expected to be undetected, such as adipocytes. | HPA reports adipocytes as Not detected in adipose tissue (HPA: adipose tissue IHC). Check whether the signal follows a cellular pattern and persists in a no-primary control. Cross-reactivity or endogenous detection activity is possible; staining alone cannot distinguish them. |
| Diffuse color across tissue, spaces and slide background. | AOC1 is secreted, so extracellular signal cannot be dismissed solely by location (UniProt P19801: extracellular space). Yet uniform color that ignores tissue structure is poorly supported by HPA's cellular profile (HPA: cytoplasmic and membranous); assess background controls and detection conditions. |
| No discernible stain in colon glands or kidney tubules. | An absent signal conflicts with the supplied strong positive examples (HPA: High in colon glandular cells and kidney tubule cells). First establish that tissue morphology and detection controls are satisfactory; a failed positive control does not establish biological absence. |
💡Expected AOC1 appearanceCall a section positive when colon glandular cells or kidney tubule cells show clear, strong cytoplasmic and membranous stain (HPA: High in both; cytoplasmic and membranous profile); isolated nuclear color or structure-free background is suspect against that pattern.
| Secretion and membrane association | UniProt lists extracellular space and cell membrane, with no transmembrane segment (UniProt P19801 topology). Consider extracellular color in context, but anchor scoring to HPA's observed cellular pattern (HPA: cytoplasmic and membranous). |
| Tissue choice and RNA comparison | Colon glands and kidney tubules provide High IHC examples; placenta trophoblasts are Medium (HPA: tissue IHC). HPA reports low staining–RNA consistency and expects RNA and protein locations to differ for a secreted protein (HPA: reliability description). |
| Antibody evidence | Two listed antibodies, HPA031032 and HPA031033, have Approved IHC status (HPA: antibody validation). Neither has an ICC status in the supplied list (HPA: antibody validation); IHC approval alone does not establish an IF/ICC staining pattern. |
| Processing and isoforms | The annotated signal peptide spans residues 1–19, with a mature chain at 20–751; two isoforms are listed (UniProt P19801). Without an antibody epitope or isoform-specific staining record, their effect on this IHC result is unknown. |
| Antigen retrieval and detection | These are general IHC workflow variables. Optimize retrieval and chromogen exposure against a positive tissue and a no-primary control (general IHC practice). The supplied HPA and UniProt records do not establish AOC1-specific fixation sensitivity or retrieval requirements. |
| Situation | Likely cause | Next action |
|---|---|---|
| A known-positive section has no stain. | The expected reference pattern is missing (HPA: High in colon glands and kidney tubules). A detection or retrieval problem is possible, but these records do not identify an AOC1-specific cause. | Confirm tissue identity and an intact positive detection control. Review the IHC-validated antibody's own instructions, then adjust retrieval or detection with paired controls (general IHC practice). Do not score other sections as negative until the positive control works. |
| Only nuclei appear positive. | Nuclear-only signal diverges from the reported cytoplasmic and membranous profile (HPA: tissue IHC). The supplied subcellular record lists secretion and supplies no ICC-IF images (HPA: subcellular). | Inspect matched no-primary and positive tissue sections. Recheck counterstain and chromogen exposure (general IHC practice); require the expected cellular pattern before calling AOC1 positive. |
| Strong color appears in expected-negative cells. | For example, adipocytes are Not detected in the supplied tissue profile (HPA: adipose tissue IHC). Cross-reactivity or endogenous chromogenic activity may explain unexpected color (general IHC practice). | Compare a no-primary control and a known-positive section processed together. If the control is colored, address background or endogenous activity; if it is clean, reassess antibody specificity (general IHC practice). |
| Color is diffuse or obscures cell boundaries. | Secreted AOC1 can occupy extracellular space (UniProt P19801: subcellular location), but uniform color cannot be assigned to AOC1 from that annotation alone. | Compare tissue-free areas and a no-primary control, and reduce excessive detection development if needed (general IHC practice). Score only interpretable cellular staining against the HPA profile (HPA: cytoplasmic and membranous). |
| A placenta section looks weaker than a colon section. | That difference can match the supplied examples: trophoblastic cells are Medium, while colon glandular cells are High (HPA: tissue IHC). It does not by itself show assay failure. | Check the relevant cell populations and compare sections run under the same conditions (general IHC practice). Use the reported tissue-specific levels when judging whether the signal is plausible (HPA: tissue IHC). |
| Can the IHC pattern serve as an IF/ICC expectation? | The supplied HPA subcellular record has no ICC-IF image-bearing cell lines, and the listed antibodies have no ICC status (HPA: subcellular; antibody validation). | Use the separate IF/ICC guide for that application. Treat cytoplasmic and membranous tissue IHC as context only (HPA: tissue IHC); do not infer an IF/ICC protocol or validated fluorescent pattern from these records. |
Experiment evidence
IHC & IF images showing AOC1 staining
PB10040 · IHCIHC analysis of ABP1/AOC1 using anti-ABP1/AOC1 antibody (PB10040). ABP1/AOC1 was detected in a paraffin-embedded section of human colonic ad
PB10040 · IHCIHC analysis of ABP1/AOC1 using anti-ABP1/AOC1 antibody (PB10040). ABP1/AOC1 was detected in a paraffin-embedded section of human placenta t
PB10040 · IFIF analysis of ABP1/AOC1 using anti-ABP1/AOC1 antibody (PB10040). ABP1/AOC1 was detected in an immunocytochemical section of T-47D cells. En
A08386-1 · IHCIHC analysis of ABP1/AOC1 using anti-ABP1/AOC1 antibody (A08386-1). ABP1/AOC1 was detected in a paraffin-embedded section of human colorecta
A08386-1 · IFIF analysis of ABP1/AOC1 using anti-ABP1/AOC1 antibody (A08386-1). ABP1/AOC1 was detected in an immunocytochemical section of T-47D cells. E
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000002726-AOC1/tissue/cerebral+cortex#imid_8782732
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000002726-AOC1/tissue/colon#imid_8782658
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000002726-AOC1/tissue/liver#imid_8782659
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000002726-AOC1/tissue/kidney#imid_8782660
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for AOC1 IHC & IF
🧪Run colon first and expect staining in glandular cells (HPA: High in colon glandular cells); use adipose tissue as the negative tissue, with adipocytes expected to lack staining (HPA: Not detected in adipocytes). On the colon slide, morphologically nonglandular cells can serve as internal negative cells if they show only no-primary background; verify this on the slide because HPA identifies glandular cells as High but does not establish other colon cells as negative (HPA: High in colon glandular cells).
Positive control tissue: Colon (Glandular cells, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA carries no ICC-IF cell line for AOC1; derive a cell-line control from the positive tissue's cell type (Glandular cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control; a concentration- and clonality-matched rabbit IgG isotype control (caption: rabbit primary antibody); and AOC1-knockout material, if available, as a biological negative (standard IHC controls). Quench endogenous peroxidase and compare any luminal background with the no-primary slide when scoring colon staining (caption: colon section with HRP/DAB detection; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected paraffin-section caption does not state a fixative (caption: paraffin section; fixative unreported). Heat-mediated retrieval in EDTA at pH 8.0 was used, but retrieval dependence has not been established (caption: EDTA retrieval at pH 8.0). The supplied evidence does not establish frozen sections or IF/ICC as easier (HPA: no ICC-IF cell-line images); assess colon luminal debris or mucus against control-slide background before scoring it as glandular staining (HPA: High in colon glandular cells; caption: HRP/DAB detection; standard IHC practice).
HPA tissue IHC evidence for AOC1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Low consistency between antibody staining and RNA expression data. Secreted protein, tissue location of RNA and protein is expected to differ.). 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 |
|---|---|---|---|---|
| Colon | Glandular cells | High | Protein (IHC) | HPA → |
| Kidney | Cells in tubules | High | Protein (IHC) | HPA → |
| Appendix | Lymphoid tissue | Medium | Protein (IHC) | HPA → |
| Duodenum | Glandular cells | Medium | Protein (IHC) | HPA → |
| Placenta | Trophoblastic 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 → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Bronchus | Respiratory epithelial cells | Not detected | Protein (IHC) | HPA → |
| Caudate | Glial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced AOC1 IHC Tips
Troubleshoot AOC1 staining in paraffin sections by checking retrieval, tissue controls, compartment patterns, and scoring before interpreting chromogenic signal.
How should I adjust retrieval when AOC1 staining is weak?
Start with heat-mediated retrieval in EDTA at pH 8.0 (datasheet PB10040). The documented paraffin-section example then used 10% goat serum and 2 μg/ml primary antibody overnight at 4°C (datasheet PB10040). If staining remains weak, compare a modest change in heating time on matched sections while holding antibody concentration and detection constant (standard IHC practice). Include a glandular-cell-rich colon section as a positive tissue comparator (HPA: High in colon glandular cells). Judge retrieval by preserved morphology as well as signal, because tissue damage can make an apparent gain in staining difficult to interpret (standard IHC practice).
Could fixation explain faint or uneven AOC1 staining?
AOC1-specific fixation sensitivity is unknown because the selected paraffin-section caption does not state a fixative (datasheet PB10040). Record the fixative, fixation duration, tissue thickness, and processing history for each specimen before comparing staining intensity (standard IHC practice). On matched sections, keep EDTA retrieval at pH 8.0 and the 2 μg/ml primary-antibody condition constant while examining processing differences (datasheet PB10040; standard IHC practice). Look for gradients from the section edge toward its center and check morphology before assigning uneven signal to biological variation (standard IHC practice). A well-preserved positive control helps distinguish a specimen-specific processing problem from a failed staining run (standard IHC practice).
Which staining compartments should I accept as plausible for AOC1?
Evaluate cytoplasmic and membranous staining in tissue sections, while allowing extracellular signal in its anatomical context (HPA: cytoplasmic and membranous expression; UniProt P19801: secreted, extracellular space and cell membrane). AOC1 has a signal peptide at residues 1–19 and no annotated transmembrane segment, so a membrane-adjacent pattern alone does not establish membrane insertion (UniProt P19801 topology). Compare cellular staining with surrounding extracellular material and the matched negative control (standard IHC practice). Colon glandular cells and kidney tubule cells provide reported high-expression reference patterns (HPA: High in colon glandular cells and kidney tubule cells). Treat isolated nuclear staining as suspect until independently supported (UniProt P19801 localisation; standard IHC practice).
How can epitope uncertainty affect AOC1 IHC interpretation?
AOC1 has 2 annotated isoforms, but the supplied antibody caption does not identify its epitope or establish isoform discrimination (UniProt P19801 isoforms; datasheet PB10040). Consequently, positive chromogenic staining cannot identify which isoform produced the signal (UniProt P19801 isoforms; standard IHC interpretation). The protein also has annotated glycosylation sites at residues 110, 168, 538, and 745, plus a modified residue at 461 (UniProt P19801 PTMs). These features make epitope accessibility a consideration, but the payload does not establish their effect on this antibody (UniProt P19801 PTMs; datasheet PB10040). If results conflict with expected tissue patterns, seek independent epitope information or orthogonal evidence before claiming isoform-specific expression (standard IHC practice).
How should I follow up an AOC1 IHC pattern with IF?
Use IF as a separate follow-up assay; the supplied product evidence describes chromogenic staining of a paraffin section, not an IF validation (datasheet PB10040). Multiplex AOC1 with an independently validated marker for the cell population being assessed, such as a glandular-cell marker when investigating colon glands (HPA: High in colon glandular cells; standard IF practice). Select fluorophores after inspecting unstained tissue for autofluorescence, and place the weaker signal in a cleaner spectral channel (standard IF practice). Set permeabilisation according to the antibody epitope’s location, which is unspecified here, while considering both cellular and extracellular AOC1 (datasheet PB10040; UniProt P19801 localisation). Include single-stain and no-primary controls to assess channel bleed-through and background (standard IF practice).
What should I change if DAB appears throughout the section?
Run a no-primary control to separate primary-antibody-dependent staining from detection background (standard IHC practice). Check endogenous peroxidase blocking before HRP and DAB development; the selected caption documents peroxidase-conjugated detection and DAB but does not report a peroxidase-blocking step (datasheet PB10040; standard IHC practice). Compare background after the documented 10% goat-serum block with staining in the positive-control compartment (datasheet PB10040; standard IHC practice). Reduce excessive primary-antibody exposure only after checking controls against the documented 2 μg/ml, overnight at 4°C condition (datasheet PB10040; standard IHC practice). Diffuse extracellular signal needs anatomical review because AOC1 is secreted (UniProt P19801 localisation).
How should I score AOC1 across tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the scored compartment and cell population before measuring staining, because reported AOC1 patterns include cytoplasmic and membranous expression as well as secretion (HPA: tissue profile; UniProt P19801 localisation). For identifiable cells, report percent positive and an H-score using intensity grades 0–3; for extracellular deposits, report stained area or optical density per mm² (standard IHC quantification practice). Normalise cellular results to the number of eligible cells and extracellular measurements to analyzable tissue area (standard IHC quantification practice). Exclude folds, torn edges, and necrotic regions using the same rules across samples (standard IHC quantification practice). Keep retrieval, DAB development, imaging, and thresholds consistent across the comparison (standard IHC practice).
How can I distinguish convincing AOC1 staining from artefact?
Seek reproducible signal in plausible cells and compartments: colon glandular cells and kidney tubule cells have reported high staining, while AOC1 can be cellular or extracellular (HPA: tissue IHC; UniProt P19801 localisation). Compare unexpected nuclear or unrelated-cell staining with a no-primary control and an appropriate positive tissue on the same run (UniProt P19801 localisation; standard IHC practice). Discount staining confined to section edges, damaged areas, or necrosis unless it persists in intact tissue (standard IHC practice). Investigate diffuse DAB where endogenous peroxidase could contribute, using the no-primary control and peroxidase blocking as checks (standard IHC practice). Interpret discordance with RNA cautiously because secreted AOC1 may appear away from the cells producing it (HPA: reliability description).
Boster reagents
Best AOC1 / Diamine oxidase [copper-containing] IHC Antibodies
Two anti-AOC1 antibodies have human paraffin-section IHC images and T-47D IF/ICC images (catalog image captions); both list Human and Monkey reactivity (catalog applications/reactivity).
Real IHC data
Anti-ABP1/AOC1 Antibody ®
Cat # PB10040
Real IHC data
Anti-ABP1/AOC1 Antibody ®
Cat # A08386-1
PB10040 has IHC images from human colonic adenoma, placenta and renal cell carcinoma paraffin sections, plus an IF/ICC image from T-47D cells (PB10040 image captions). A08386-1 has an IHC image from a human colorectal adenocarcinoma paraffin section and an IF/ICC image from T-47D cells (A08386-1 image captions).
Which to pick: For tissue IHC, choose PB10040 when its colonic adenoma, placenta or renal cell carcinoma examples match the planned tissue, or A08386-1 for its colorectal adenocarcinoma example; each caption documents a paraffin section, with the fixative unreported (respective IHC image captions). For IF/ICC, A08386-1 lists 5 μg/ml and has a T-47D image; PB10040 also has a T-47D IF/ICC image, though its catalog IF dilution field is unreported (respective catalog dilution fields and IF image captions). For cross-species work, both list Human and Monkey reactivity, while the supplied images document human samples only; clonality is unreported for both (catalog reactivity, image captions and clone fields).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P19801 (AOC1_HUMAN, Diamine oxidase [copper-containing]).
- Human Protein Atlas. AOC1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. AOC1 subcellular location (ICC-IF): Secreted.
- Human Protein Atlas. AOC1 antibody validation summary (2 antibodies).
- Low expression and significance of AOC1 in prostate adenocarcinoma. Translational andrology and urology 2026 — PMC12877924.
- Increased AOC1 Expression Promotes Cancer Progression in Colorectal Cancer. Frontiers in oncology 2021 — PMC8131869.
- AOC1 regulates labor initiation through spermidine-induced autophagy of placental trophoblast cells via EIF5A hypusination. Nature communications 2026 — PMC13438134.
- Spatially resolved multi-omics highlights cell-specific metabolic remodeling and interactions in gastric cancer. Nature communications 2023 — PMC10172194.
- PubMed PMID:2217167 — UniProt-cited evidence.
- PubMed PMID:8182053 — UniProt-cited evidence.
- PubMed PMID:8595053 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for AOC1 (Diamine oxidase [copper-containing]). Expected localisation Cytoplasmic and membranous staining (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet PB10040). Validated IHC antibody: PB10040 at 2-5 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Colon (Glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human colonic adenoma tissue; fixative not specified (datasheet PB10040); 2. Fixation: Image fixative and duration unreported (datasheet PB10040); 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 PB10040); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet PB10040); 8. Primary antibody: Rabbit anti-AOC1, 2-5 μg/ml (datasheet PB10040); 9. Primary incubation: Overnight at 4 °C (datasheet PB10040). Watch for: Fixation: Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image PB10040); Caveat: Secreted AOC1 may appear away from expressing cells (HPA tissue IHC); Isoform / epitope: Two isoforms; epitope overlap is unspecified (UniProt); Regulation: Expression regulation unreported (UniProt). Evidence: UniProt P19801, HPA tissue IHC · Approved, HPA ICC-IF · Secreted, Datasheet PB10040, PMC12877924, PMC8131869. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/AOC1/immunohistochemistry-ihc-guide.