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AOC1 / Diamine oxidase [copper-containing] · IHC design guide
Design Immunohistochemistry for AOC1
Plan AOC1 staining in paraffin sections using colon glandular cells or kidney tubules as positive controls (HPA tissue IHC). Compare cytoplasmic and membranous staining with the tissue context, and start the catalog antibody at 2–5 μg/ml (HPA tissue IHC; datasheet: 2–5 μg/ml).
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 (HPA tissue IHC) | |
| Staining pattern | Most cell types show cytoplasmic and membranous staining (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 | Keep paraffin-section fixation consistent (standard IHC practice; not target-specific) | |
| Caveat | Secretion can separate protein staining from local RNA expression (HPA tissue IHC) | |
| Regulation | No expression regulator specified (UniProt) | |
| Isoform / epitope | 2 isoforms; residues 1–19 are cleaved, so epitope site matters (UniProt) |
Section 1
Recommended AOC1 IHC & IF Protocols
The catalog antibody’s IHC-P protocol (datasheet: PB10040) is accompanied by published AOC1 chromogenic protocols for colorectal cancer tissue and mouse placenta (PMC8131869; PMC13438134).
| 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 retrieval at pH 8.0 for the catalog antibody (datasheet: PB10040). Both published protocols used citrate at pH 6.0 with their respective antibodies (PMC8131869; PMC13438134).
Section 2
What Is the Expected AOC1 Staining Pattern?
AOC1 is reported in the extracellular space and at the cell membrane, with no transmembrane segment (UniProt P19801: location, topology). Tissue IHC shows cytoplasmic and membranous staining in most cell types, with high staining in colon glandular cells and kidney tubule cells (HPA: tissue IHC). HPA rates the tissue pattern Approved but notes low consistency with RNA expression, as secreted protein can be found away from its site of synthesis (HPA: reliability).
| Colon glands or kidney tubules show clear cytoplasmic and membranous chromogen above surrounding tissue (HPA: High in colon glandular cells and kidney tubule cells). | This matches the strongest listed tissue IHC examples (HPA: tissue IHC). Score the cells and compartments that stain; secretion can complicate assignment of protein signal to its producing cell (UniProt P19801: secreted; HPA: reliability). |
| Signal is exclusively nuclear in otherwise intact cells. | An exclusively nuclear pattern conflicts with the reported cytoplasmic and membranous tissue pattern and extracellular or membrane annotation (HPA: tissue IHC; UniProt P19801: location). Check whether the nuclear color persists in a no-primary control before interpreting it as AOC1 (general IHC practice). |
| Strong chromogen appears in cells listed as not detected, such as adipocytes in adipose tissue (HPA: tissue IHC). | Treat this as discordant with the listed HPA example, rather than proof of expression. Cross-reactivity or endogenous detection activity is possible; compare a no-primary control and the expected colon or kidney pattern (general IHC practice; HPA: tissue IHC). |
| Color spreads across the section without a discernible cell or compartment pattern. | Diffuse background cannot establish the reported cytoplasmic and membranous pattern (HPA: tissue IHC). Check the no-primary control and compare tissue edges, folds and intact cells before scoring specific staining (general IHC practice). |
| Neither colon glandular cells nor kidney tubule cells stain (HPA: High in both cell populations). | A blank known-positive example raises an assay-performance question; it does not establish that AOC1 is absent. Confirm tissue identity, positive-control performance and the detection steps before interpreting the test section (HPA: tissue IHC; general IHC practice). |
💡Expected AOC1 appearanceCall a convincing positive when colon glandular or kidney tubule cells show distinct cytoplasmic and membranous staining, consistent with their high HPA levels; exclusively nuclear color or equally strong color in an HPA not detected cell population is discordant (HPA: tissue IHC).
| Protein location and secretion (UniProt P19801: location, topology). | AOC1 is annotated as secreted and cell-membrane associated, without a transmembrane segment (UniProt P19801). Interpret extracellular color cautiously alongside the observed cellular pattern (HPA: tissue IHC, reliability). |
| Choice of tissue comparator (HPA: tissue IHC). | Colon glandular cells and kidney tubule cells are High; placental trophoblastic cells are Medium, while adipose-tissue adipocytes are Not detected (HPA: tissue IHC). Match the cell type when comparing slides. |
| Strength of pattern evidence (HPA: antibody validation, reliability). | HPA lists two antibodies, HPA031032 and HPA031033, as IHC Approved; the supplied record does not label either IHC Enhanced (HPA: antibodies). HPA also reports low staining–RNA consistency for this secreted protein (HPA: reliability). |
| Processing and molecular variation (UniProt P19801: processing, isoforms, glycosylation). | The record lists a signal peptide at residues 1–19, a mature chain at 20–751, two isoforms and four glycosylation sites (UniProt P19801). It supplies no epitope map or target-specific retrieval or fixation effect; avoid predicting how those features alter staining. |
| IF/ICC: what pattern is established? (HPA: subcellular ICC-IF). | HPA summarizes AOC1 as secreted but provides no main ICC-IF location or cell-line images (HPA: subcellular ICC-IF). Use the tissue IHC observations as context, without treating them as an IF/ICC validation. |
| Situation | Likely cause | Next action |
|---|---|---|
| The positive tissue is blank. | The stain may have failed, or the sampled section may lack the expected glandular or tubular cells (general IHC practice; HPA: tissue IHC). | Confirm the cell type on the counterstain, then review the antibody, retrieval and detection run with a known-positive section (general IHC practice; HPA: High in colon glands and kidney tubules). |
| All tissue compartments look brown. | Background from detection or insufficient blocking may obscure a cellular pattern (general IHC practice). | Compare a no-primary control; review blocking, washes and detection conditions, then score only distinguishable cells (general IHC practice). |
| The no-primary control is also colored. | For an HRP-based chromogenic assay, endogenous peroxidase or detection-system background may contribute (general IHC practice). | Review the peroxidase-blocking and detection steps, and repeat the control beside the test section (general IHC practice). |
| Signal is confined to nuclei. | The compartment disagrees with the reported cytoplasmic and membranous tissue pattern (HPA: tissue IHC). | Check counterstain and no-primary control, then compare the same tissue with a validated positive section before assigning AOC1 (general IHC practice; HPA: tissue IHC). |
| An unexpected cell population stains strongly. | Cross-reactivity or endogenous activity is possible when staining conflicts with an HPA Not detected example (general IHC practice; HPA: tissue IHC). | Compare cell-matched HPA examples and controls; report the discordance rather than scoring it as established AOC1 expression (HPA: tissue IHC; general IHC practice). |
| Protein staining does not track local RNA expression. | Secreted AOC1 may be detected away from the cells producing it; HPA explicitly reports low staining–RNA consistency (UniProt P19801: secreted; HPA: reliability). | Describe the stained cells and compartments on the slide, and avoid inferring their AOC1 transcription from protein color alone (HPA: reliability; general IHC practice). |
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; its glandular cells should stain strongly (HPA: Colon glandular cells High). Use adipose tissue as a negative, focusing on adipocytes (HPA: Adipose adipocytes Not detected); on the colon slide, cells without specific staining should show only background, although HPA does not identify a negative cell type there (HPA: Colon glandular cells High).
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 host- and isotype-matched rabbit IgG control, and an AOC1 knockout biological negative where available (caption: rabbit primary; standard IHC specificity controls). For colon DAB staining, quench endogenous peroxidase and assess any gland-luminal background against the no-primary slide (HPA: Colon glandular cells High; caption: DAB detection; standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported; the selected PB10040 paraffin-section caption does not state the fixative (caption: fixative not stated). Heat retrieval in EDTA at pH 8.0 was used, but retrieval dependence was not tested (caption: EDTA pH 8.0). The supplied evidence does not establish whether frozen sections or IF are easier (caption: paraffin-section IHC; HPA: no ICC-IF cell-line images); in colon, assess possible gland-luminal background when scoring DAB staining (HPA: Colon glandular cells High; caption: 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 chromogenic IHC by checking retrieval, staining compartment, tissue controls and scoring against the reported evidence.
What retrieval should I use when AOC1 staining is weak in paraffin sections?
Start with heat-mediated retrieval in EDTA at pH 8.0 for paraffin sections (datasheet PB10040). The selected AOC1 tissue image used that condition, followed by 2 μg/ml primary antibody overnight at 4°C (datasheet PB10040). Keep retrieval conditions identical between test and control sections while checking whether tissue damage or diffuse DAB increases (standard IHC practice). If staining remains weak, compare a small retrieval series, including citrate at pH 6.0, as a fallback rather than assuming another buffer is superior (standard IHC practice). The caption does not report the fixative, so it cannot establish retrieval performance across fixation conditions (datasheet PB10040).
Could fixation explain inconsistent AOC1 staining between paraffin blocks?
The selected paraffin-section caption does not state a fixative, and target-specific fixation sensitivity is unknown (datasheet PB10040). Record each block’s fixative and processing history before comparing staining intensity across specimens (standard IHC practice). Test differently processed blocks alongside the same positive control and hold retrieval, antibody concentration and DAB development constant (standard IHC practice). The documented staining workflow used EDTA pH 8.0 retrieval and 2 μg/ml primary antibody overnight at 4°C (datasheet PB10040). If a block stains poorly, evaluate tissue preservation and a general staining control before attributing the result to AOC1 loss (standard IHC practice).
Where should convincing AOC1 staining appear in tissue sections?
Expect a cytoplasmic or membranous pattern in many cell types, while allowing extracellular signal because AOC1 is secreted (HPA: tissue profile; UniProt P19801 subcellular location). AOC1 has no annotated transmembrane segment, so a sharp membrane rim alone does not establish membrane anchoring (UniProt P19801 topology). High staining in colon glandular cells or kidney tubular cells provides useful tissue reference patterns (HPA: tissue IHC). Inspect intact cells and adjacent extracellular spaces together, using the same counterstain and exposure to DAB development across sections (standard IHC practice). Treat predominantly nuclear staining as suspect until controls support it (UniProt P19801 subcellular location; standard IHC practice).
Can this stain distinguish AOC1 isoforms or reveal epitope masking?
AOC1 has 2 annotated isoforms, but the supplied antibody caption does not map its epitope or establish isoform selectivity (UniProt P19801 isoforms; datasheet PB10040). The precursor has a signal peptide at residues 1–19 and a reported mature chain at 20–751 (UniProt P19801 processing). Four glycosylation sites and a topaquinone-modified residue are annotated, without evidence here that either alters this antibody’s staining (UniProt P19801 modifications). Compare staining with an independently mapped antibody if isoform assignment matters (standard IHC practice). Document the epitope position before interpreting absent staining as loss of a particular isoform or processing state (standard IHC practice).
How should I adapt AOC1 localisation checks for multiplex immunofluorescence?
Use an epithelial marker alongside AOC1 when examining glandular cells, and confirm cell identity in a separate channel (HPA: colon glandular-cell staining; standard IF practice). Choose spectrally separated fluorophores after checking tissue autofluorescence with an unstained section, particularly when interpreting weak extracellular signal (standard IF practice; UniProt P19801 subcellular location). Because the antibody’s epitope is not mapped and AOC1 has no transmembrane segment, establish whether permeabilisation improves access before assigning an intracellular or surface-facing epitope (datasheet PB10040; UniProt P19801 topology; standard IF practice). Include single-channel and secondary-only controls to distinguish bleed-through and background (standard IF practice). The supplied product evidence documents paraffin chromogenic IHC, not an IF staining condition (datasheet PB10040).
How can I separate AOC1 signal from diffuse brown background?
Compare a no-primary section with the AOC1-stained section to identify background from the detection system (standard IHC practice). Block endogenous peroxidase before HRP and DAB detection, then check whether residual colour follows tissue edges or damaged areas (standard IHC practice). The documented image used 10% goat serum blocking, 2 μg/ml primary antibody overnight at 4°C, and HRP with DAB (datasheet PB10040). Keep DAB development and counterstaining matched between sections when judging diffuse extracellular staining, which is plausible for secreted AOC1 (standard IHC practice; UniProt P19801 subcellular location). If background persists, compare the negative control and an expected positive tissue on the same run (standard IHC practice; HPA: tissue IHC).
What is a defensible way to score AOC1 chromogenic staining? ⚠ ANSWER MARKED FOR VERIFICATION
Score a defined cell population, such as colon glandular cells or kidney tubular cells, separately from extracellular deposits (HPA: tissue IHC; UniProt P19801 subcellular location). Record percent positive cells and intensity, then calculate an H-score from 0–300 when intensity categories are reproducible (standard IHC practice). For extracellular staining, report positive area or DAB optical density per mm² of viable tissue instead of folding it into a cellular H-score (standard IHC practice). Normalise cell counts to the eligible cell population and area measurements to viable tissue area, excluding folds and necrosis (standard IHC practice). Apply one threshold and one DAB development condition across the comparison set (standard IHC practice).
When is an unexpected AOC1-positive area likely to be artefactual?
Check whether staining fits cytoplasmic, membranous or extracellular AOC1 localisation, and question a predominantly nuclear pattern (HPA: tissue profile; UniProt P19801 subcellular location). Compare suspected signal with colon glandular cells or kidney tubular cells, both reported as high in tissue IHC (HPA: tissue IHC). Edge-restricted colour, necrotic areas and signal retained in a no-primary control warrant review for staining artefact or endogenous peroxidase (standard IHC practice). HPA reports low consistency between staining and RNA expression and notes that secretion can separate protein from its site of RNA expression (HPA: reliability description). A positive DAB stain establishes antigen detection under these conditions, not AOC1 catalytic activity (standard IHC interpretation; UniProt P19801 function).
Boster reagents
Best AOC1 / Diamine oxidase [copper-containing] IHC Antibodies
Both anti-AOC1 antibodies have human paraffin-section IHC images and T-47D cell IF images; both list human and monkey reactivity (catalog image captions; catalog 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 a T-47D cell IF image (PB10040 image captions). A08386-1 has a human colorectal adenocarcinoma paraffin-section IHC image and a T-47D cell IF image (A08386-1 image captions).
Which to pick: For tissue IHC, choose PB10040 for the human colonic adenoma example or A08386-1 for the human colorectal adenocarcinoma example; each caption uses 2 μg/ml on a paraffin section, and neither reports the fixative (respective IHC captions). For IF/ICC, A08386-1 lists an IF concentration of 5 μg/ml and shows T-47D cell IF data (A08386-1 catalog; IF caption). For cross-species planning, both list human and monkey reactivity, but the supplied IHC and IF images show human samples only (catalog reactivity; image captions).
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 (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: Keep paraffin-section fixation consistent (standard IHC practice; not target-specific); Caveat: Secretion can separate protein staining from local RNA expression (HPA tissue IHC); Isoform / epitope: 2 isoforms; residues 1–19 are cleaved, so epitope site matters (UniProt); Regulation: No expression regulator specified (UniProt). Evidence: UniProt P19801, HPA tissue IHC · Approved, HPA ICC-IF · Secreted, Datasheet PB10040, PMC8131869, PMC13438134. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/AOC1/immunohistochemistry-ihc-guide.