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ATF3 / Cyclic AMP-dependent transcription factor ATF-3 · IHC design guide
Design Immunohistochemistry for ATF3
Plan chromogenic IHC on paraffin sections using nuclear staining as the expected ATF3 pattern in most tissues (HPA tissue IHC). Colon glandular cells show medium staining, while esophageal squamous epithelial cells have no detected staining; interpret controls in light of low consistency between antibody staining and RNA expression (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
ATF3 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 | Nuclear in most tissues (HPA tissue IHC) | |
| Staining pattern | Nuclear staining in most tissues (HPA tissue IHC) | |
| Antigen retrieval | Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A00904-2) | |
| Positive control | Fallopian tube+4 more · see all | |
| Negative control | Esophagus+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across sections (standard IHC practice; not target-specific) | |
| Caveat | Antibody staining and RNA expression show low consistency (HPA tissue IHC) | |
| Regulation | Expression regulation is not annotated (UniProt) | |
| Isoform / epitope | Five isoforms; epitope coverage is unspecified (UniProt) |
Section 1
Recommended ATF3 IHC & IF Protocols
Compare the catalog antibody’s IHC protocol (datasheet: A00904-2) with four published ATF3 chromogenic IHC protocols (PMC2924561; PMC3772181; PMC12837017; PMC5564541).
| Sample | Paraffin-embedded human Colon cancer tissue; fixative not specified (datasheet A00904-2) |
| Fixation | Image fixative and duration unreported (datasheet A00904-2); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Tris-EDTA pH 9.0 (datasheet A00904-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% normal serum of the secondary host, 30 min, room temperature (standard) |
| Primary antibody | Rabbit anti-ATF3, 1:100 recommended; image 1:200 (datasheet A00904-2) |
| Primary incubation | Overnight at 4 °C (standard) |
| Detection | HRP-polymer secondary, DAB chromogen 5–10 min (standard) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | ATF3-positive staining in ciliated cells (tip of cilia) of fallopian tube (HPA tissue IHC: High). HPA tissue profile: Nuclear expression in most tissues. No signal in the no-primary control. |
💡Decision noteStart with pH 9.0 Tris-EDTA heat retrieval for the catalog antibody (datasheet: A00904-2). Colorectal TMA sections used citrate at pH 6.0 (PMC5564541: methods).
Section 2
What Is the Expected ATF3 Staining Pattern?
ATF3 is a nuclear, DNA-binding transcription factor with no transmembrane segment (UniProt P18847). In paraffin-section IHC, expect nuclear staining across many tissues, including appendix glandular cells and cerebral cortex neurons (HPA tissue IHC). The tissue IHC profile is Approved, but antibody staining has low consistency with RNA expression; use the listed cell types as reference patterns, not guarantees for every specimen (HPA tissue IHC).
| Distinct nuclear signal in appendix or colon glandular cells, or in cerebral cortex neurons, with relatively clear surrounding tissue. | This fits the reported Medium staining in those cell types (HPA tissue IHC) and ATF3's nuclear location (UniProt P18847). Judge intensity against a matched control slide; the HPA categories describe observed staining, not a required intensity for every preparation (HPA tissue IHC). |
| Predominantly diffuse cytoplasmic or membranous staining, without convincing nuclear signal. | That distribution conflicts with the principal nuclear location (UniProt P18847; HPA subcellular). Check the control and detection background before calling it ATF3. HPA also reports High staining at fallopian-tube ciliary tips, so an isolated nonnuclear feature needs context rather than automatic dismissal (HPA tissue IHC). |
| Strong signal in esophageal squamous cells, cardiomyocytes, or skeletal-muscle myocytes. | These cell types are listed as Not detected (HPA tissue IHC). Recheck tissue identification and whether staining follows cell boundaries, pigment, or reagent deposition; cross-reactivity or endogenous detection activity is possible (standard IHC practice). A single discrepancy does not establish a new ATF3 tissue pattern. |
| Broad, hazy chromogen over cells and extracellular areas, with poor nuclear contrast. | This is an uninterpretable localization pattern, since the expected principal compartment is nuclear (UniProt P18847; HPA tissue IHC). Uneven blocking, washing, or chromogen development can contribute to nonspecific background (standard IHC practice). Compare a no-primary control before scoring any nuclei. |
| No nuclear signal in an appendix, colon, or cerebral cortex section selected as a positive control. | HPA reports Medium staining in the specified glandular or neuronal cells (HPA tissue IHC), so verify that those cells are present and that the control run worked. Absence in one section is not definitive: the HPA tissue profile is Approved with low staining-to-RNA consistency (HPA tissue IHC). |
💡Expected ATF3 appearanceCall a result positive when identifiable nuclei stain in the relevant cells, such as Medium-staining appendix or colon glandular cells (HPA tissue IHC), with localization consistent with nuclear ATF3 (UniProt P18847); diffuse haze or staining confined to an unexpected compartment is a warning to investigate (standard IHC practice).
| Tissue and cell selection | HPA reports nuclear expression in most tissues, with Medium staining in appendix and colon glandular cells and Not detected staining in esophageal squamous cells (HPA tissue IHC). Select controls by the named cell population, then verify it is present on the section. |
| Antibody evidence | The HPA tissue profile is Approved, while its staining shows low consistency with RNA expression; HPA001562 is IHC Approved and ICC Supported (HPA tissue IHC; HPA antibodies). These labels support use as a reference but do not resolve every unexpected signal. |
| Isoforms and epitope | UniProt lists 5 ATF3 isoforms and a bZIP domain at residues 86–149 (UniProt P18847). The supplied evidence does not locate the catalog antibody's epitope, so it cannot establish which isoforms that antibody detects. |
| Fixation and antigen retrieval | Target-specific fixation effects are not established by the supplied assay evidence. Verify with a matched IHC source before attributing a result to fixation. |
| IF/ICC Q: What localization should I expect? | A: HPA supports nucleoplasm and nucleoli; it marks basal body, vesicles, and centrosome as uncertain (HPA subcellular). Those ICC-IF observations can guide interpretation, but this IHC section does not specify an IF/ICC protocol. |
| Situation | Likely cause | Next action |
|---|---|---|
| A candidate positive tissue has little or no nuclear chromogen. | The sampled section may lack the HPA-listed cell type, or the IHC run may have failed (HPA tissue IHC; standard IHC practice). | Locate the relevant glandular or neuronal cells, examine the matched positive control, and check the catalog antibody's IHC-P staining conditions before interpreting the specimen (HPA tissue IHC; standard IHC practice). |
| An expected negative cell type stains strongly. | HPA lists esophageal squamous cells, cardiomyocytes, and skeletal-muscle myocytes as Not detected (HPA tissue IHC); nonspecific binding or endogenous detection activity may mimic signal (standard IHC practice). | Confirm cell identity, compare a no-primary control, and review blocking and detection steps (standard IHC practice). Treat persistent staining as unresolved until its nuclear localization and reproducibility are checked (UniProt P18847; standard IHC practice). |
| Staining is mainly cytoplasmic or outlines cell membranes. | That pattern does not match ATF3's principal nuclear localization (UniProt P18847; HPA subcellular), though HPA records a ciliary-tip signal in fallopian tube (HPA tissue IHC). | Check the tissue and cell type, examine nuclear counterstain alignment, and compare controls (standard IHC practice). Document any fallopian-tube ciliary-tip staining separately from nuclear scoring (HPA tissue IHC). |
| Hazy staining obscures nuclear boundaries. | Background from blocking, washing, or detection can make compartment scoring unreliable (standard IHC practice). | Compare a no-primary control and review wash, blocking, and chromogen-development steps (standard IHC practice). Score ATF3 only where individual nuclei can be distinguished, consistent with its nuclear localization (UniProt P18847). |
| Only a few cells stain in a tissue expected to show broader expression. | HPA describes nuclear expression in most tissues but also reports low consistency between antibody staining and RNA expression (HPA tissue IHC). Differences in sampled cell populations can change the apparent distribution (standard IHC practice). | Identify and record the stained cell types and their nuclear intensity, then compare the same populations across sections and controls (standard IHC practice). Avoid converting the broad HPA profile into a universal positive-cell threshold (HPA tissue IHC). |
| An ICC-IF image shows a nucleolar punctum or a basal-body-like focus. | Nucleolar localization is supported, whereas basal-body localization is uncertain in HPA's ICC-IF summary (HPA subcellular). | Interpret the finding in the dedicated IF/ICC guide and compare it with a nuclear marker and appropriate controls (standard IF practice). Do not use that image alone to define the expected chromogenic IHC pattern (HPA subcellular; HPA tissue IHC). |
Experiment evidence
IHC & IF images showing ATF3 staining
A00904-2 · IHCImmunohistochemical analysis of paraffin-embedded human Colon cancer. 1, Antibody was diluted at 1:200 (4° overnight). 2, Tris-EDTA, pH9.0 w
A00904-1 · IHCImmunohistochemistry (IHC) analyzes of ATF3 (N159) pAb in paraffin-embedded human breast carcinoma tissue at 1:100.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000162772-ATF3/tissue/cerebral+cortex#imid_870464
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000162772-ATF3/tissue/colon#imid_870382
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000162772-ATF3/tissue/liver#imid_870391
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000162772-ATF3/tissue/kidney#imid_870392
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA001562; green = ATF3, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA001562; green = ATF3, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for ATF3 IHC & IF
🧪Run fallopian tube first and assess staining in ciliated cells at the tips of cilia (HPA: High in ciliated cells at the tips of cilia); use esophageal squamous epithelial cells as the negative tissue (HPA: Not detected). On the positive slide, adjacent cells without the specified staining should show only background-level chromogen; treat them as internal background comparators, since their ATF3 status is unreported in the supplied HPA row.
Positive control tissue: Fallopian tube (Ciliated cells (tip of cilia), HPA High)
Negative control tissue: Esophagus (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show ATF3 in A-431, U-251MG, U2OS, ASC52telo, RPTEC/TERT1, hTERT-RPE1 (serum starved), KOLF2.1J, with annotated localisation: Nucleoplasm (supported), Nucleoli (supported), Basal body (uncertain) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control and an isotype control matched to the primary antibody’s host species and immunoglobulin class; use ATF3-knockout material, or peptide competition if the cognate peptide is available, as a biological specificity control (standard IHC practice). For chromogenic staining of fallopian tube, block endogenous peroxidase and, if using biotin-based detection, endogenous biotin (standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected paraffin-section caption does not state its fixative (A00904-2 caption: fixative unreported). The caption uses Tris-EDTA at pH 9.0 for retrieval, but does not establish that ATF3 staining depends on that condition; it also does not establish whether frozen sections or IF are easier (A00904-2 caption). Tip-of-cilia staining warrants careful assessment against background and nuclear staining because UniProt places ATF3 in the nucleus, while HPA reports ciliary-tip staining in fallopian tube (UniProt P18847: Nucleus; HPA: High in ciliated cells at the tips of cilia).
HPA tissue IHC evidence for ATF3
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Low consistency between antibody staining and RNA expression data.). 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 |
|---|---|---|---|---|
| Fallopian tube | Ciliated cells (tip of cilia) | High | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Medium | Protein (IHC) | HPA → |
| Bronchus | Ciliated cells (cell body) | Medium | Protein (IHC) | HPA → |
| Caudate | Neuronal cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Esophagus | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
| Heart muscle | Cardiomyocytes | Not detected | Protein (IHC) | HPA → |
| Lymph node | Non-germinal center cells | Not detected | Protein (IHC) | HPA → |
| Ovary | Ovarian stroma cells | Not detected | Protein (IHC) | HPA → |
| Skeletal muscle | Myocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced ATF3 IHC Tips
Troubleshoot ATF3 staining in paraffin sections by checking retrieval, nuclear localisation, controls and scoring before interpreting biological differences.
How should I adjust retrieval when ATF3 nuclear staining is weak?
Begin with heat-mediated Tris-EDTA, pH 9.0 retrieval for paraffin sections (datasheet A00904-2). The selected image used this buffer before a 1:200 primary incubation at 4°C overnight; reproduce that sequence when investigating weak nuclear chromogen (caption A00904-2). Compare retrieval times on adjacent sections while holding primary dilution, detection and chromogen development constant, and inspect morphology after heating (standard IHC practice). If nuclei remain faint, test a milder retrieval condition as a fallback alongside the original condition and a no-primary control; assess nuclear signal separately from diffuse cytoplasmic color (UniProt P18847 localization; standard IHC practice).
Could fixation explain patchy ATF3 staining in paraffin sections?
ATF3-specific fixation sensitivity is unknown because the selected paraffin image does not report its fixative, and the supplied records provide no fixation comparison (caption A00904-2). For patchy nuclear staining, compare sections with documented fixation and processing histories under identical Tris-EDTA, pH 9.0 retrieval (datasheet A00904-2; standard IHC practice). Check morphology and counterstain quality before increasing primary concentration; uneven tissue processing can create staining gradients in paraffin IHC (standard IHC practice). Record fixation duration, processing batch and section position with each result so technical variation can be assessed before assigning a biological explanation (standard IHC practice).
Should I count cytoplasmic or ciliary ATF3 staining as positive?
Use nuclear staining as the primary IHC readout: ATF3 is annotated in the nucleus, and the tissue profile describes nuclear expression in most tissues (UniProt P18847 subcellular; HPA tissue IHC). Supported subcellular locations include nucleoplasm and nucleoli, while basal-body localisation is uncertain (HPA subcellular). A high signal at the tip of fallopian-tube cilia is reported, but it does not establish that every ciliary or cytoplasmic deposit is specific (HPA tissue IHC; standard IHC practice). Score unusual compartments separately, checking cell morphology, no-primary controls and reproducibility across adjacent sections before interpreting them as ATF3 (standard IHC practice).
How can epitope choice affect ATF3 staining across samples?
ATF3 has 5 annotated isoforms and a bZIP region spanning residues 86–149, so document the antibody’s mapped immunogen or epitope before comparing isoform coverage (UniProt P18847). The supplied product caption does not identify an epitope; its staining therefore cannot establish recognition of every isoform (caption A00904-2; UniProt P18847). A phosphothreonine is annotated at residue 162, but its effect on this antibody’s staining is untested here (UniProt P18847; caption A00904-2). If sample groups stain differently, compare identical processing and nuclear controls first, then seek epitope information or an independent antibody before assigning the difference to splicing or modification (standard IHC practice).
How should I adapt the nuclear ATF3 readout for multiplex IF?
For the separate IF/ICC workflow, pair ATF3 with a marker identifying the expected cell population, such as glandular cells when examining colon, and assess signal within individual nuclei (HPA tissue IHC; UniProt P18847 localization; standard IF practice). Choose spectrally separated fluorophores after inspecting unstained tissue for autofluorescence, and include single-label controls to check bleed-through (standard IF practice). ATF3 is nuclear and has no transmembrane segment, so intracellular epitope access calls for controlled permeabilisation; optimise detergent exposure against nuclear morphology (UniProt P18847 topology and localization; standard IF practice). The paraffin IHC caption supplies Tris-EDTA, pH 9.0 retrieval evidence for that image, not an IF fixation or permeabilisation condition (caption A00904-2).
What should I change if brown staining obscures ATF3 nuclei?
First distinguish diffuse chromogen from discrete nuclear signal using a no-primary section and matched chromogen development (UniProt P18847 localization; standard IHC practice). For chromogenic paraffin IHC, check endogenous peroxidase blocking, reagent blocking, washes and detection chemistry before lowering the primary concentration (standard IHC practice). The selected image used 1:200 primary antibody at 4°C overnight and 1:200 secondary antibody for 45 minutes at room temperature; these are comparison conditions, not proof that either dilution suits every specimen (caption A00904-2). If background persists, change one incubation or detection variable at a time while retaining a known staining control and consistent counterstain (standard IHC practice).
How should I quantify ATF3 across differently cellular sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and nuclear positivity threshold before scoring, because the expected ATF3 readout is nuclear and staining varies among tissue cell types (UniProt P18847 localization; HPA tissue IHC; standard IHC practice). Report % positive nuclei with the number of eligible nuclei, or use an H-score combining nuclear intensity and positive-cell fraction (standard IHC practice). For spatial comparisons, report positive nuclei per mm² of viable, annotated tissue and also the total eligible nuclear density (standard IHC practice). Keep retrieval, staining batch, counterstain, image acquisition and thresholds matched; exclude folds and necrotic regions by a prespecified rule (standard IHC practice).
How can I distinguish genuine ATF3 staining from artefact?
Give greatest weight to reproducible nuclear staining in intact cells, consistent with the annotated nuclear location and the tissue IHC profile (UniProt P18847 localization; HPA tissue IHC). Interpret isolated cytoplasmic color, section-edge intensification and staining in necrotic areas cautiously, and compare no-primary sections for endogenous enzyme or detection background (standard IHC practice). Cell identity matters: colon glandular cells show medium staining in the supplied tissue profile, whereas esophageal squamous epithelial cells are listed as not detected (HPA tissue IHC). That profile has approved reliability but low staining-to-RNA consistency, so a surprising result warrants matched controls and independent validation before a biological claim (HPA tissue IHC; standard IHC practice).
Boster reagents
Best ATF3 / Cyclic AMP-dependent transcription factor ATF-3 IHC Antibodies
Two anti-ATF3 antibodies have paraffin-section IHC images from human cancers (catalog image captions); one also lists IF and mouse reactivity (catalog: A00904-2 applications and reactivity).
Real IHC data
Anti-ATF-3 Antibody
Cat # A00904-2
Real IHC data
Anti-ATF3 (N159) Antibody
Cat # A00904-1
A00904-1 lists IHC for human and rat and shows paraffin-embedded human breast carcinoma at 1:100 (catalog applications, reactivity and image caption). A00904-2 lists IHC and IF for human, mouse and rat and shows paraffin-embedded human colon cancer at 1:200 (catalog applications, reactivity and image caption).
Which to pick: For tissue IHC, choose A00904-1 for its breast carcinoma example or A00904-2 for its colon cancer example; both captions specify paraffin-embedded tissue, but neither reports the fixative (catalog image captions). For IF/ICC or mouse samples, choose A00904-2 because it lists IF and mouse reactivity; no IF image is supplied (catalog applications, reactivity and image captions). A00904-1 is described as pAb in its IHC caption; both antibodies have rabbit hosts, and neither catalog entry specifies a clone (catalog image caption and host/clone fields).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P18847 (ATF3_HUMAN, Cyclic AMP-dependent transcription factor ATF-3).
- Human Protein Atlas. ATF3 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. ATF3 subcellular location (ICC-IF): Mainly localized to the nucleoplasm, nucleoli and basal body. In addition localized to vesicles and centrosome..
- Human Protein Atlas. ATF3 antibody validation summary (1 antibodies).
- Is activating transcription factor 3 up-regulated in patients with hypospadias?. Korean journal of urology 2010 — PMC2924561.
- Bortezomib-induced painful peripheral neuropathy: an electrophysiological, behavioral, morphological and mechanistic study in the mouse. PloS one 2013 — PMC3772181.
- Sufentanil preconditioning reduces hepatic ischemia-reperfusion injury in rats by regulating ferroptosis through ATF3. BMC anesthesiology 2025 — PMC12837017.
- Overexpression of the transcription factor ATF3 with a regulatory molecular signature associates with the pathogenic development of colorectal cancer. Oncotarget 2017 — PMC5564541.
- PubMed PMID:7515060 — UniProt-cited evidence.
- PubMed PMID:12034827 — UniProt-cited evidence.
- PubMed PMID:12881527 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for ATF3 (Cyclic AMP-dependent transcription factor ATF-3). Expected localisation Nuclear in most tissues (HPA tissue IHC). Antigen retrieval: Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A00904-2). Validated IHC antibody: A00904-2 at 1:100 recommended; image 1:200 (the product's own IHC validation image is shown). Controls (HPA): positive Fallopian tube (Ciliated cells (tip of cilia)); negative Esophagus. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded human Colon cancer tissue; fixative not specified (datasheet A00904-2); 2. Fixation: Image fixative and duration unreported (datasheet A00904-2); 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: Tris-EDTA pH 9.0 (datasheet A00904-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% normal serum of the secondary host, 30 min , room temperature (standard); 8. Primary antibody: Rabbit anti-ATF3, 1:100 recommended; image 1:200 (datasheet A00904-2); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); Caveat: Antibody staining and RNA expression show low consistency (HPA tissue IHC); Isoform / epitope: Five isoforms; epitope coverage is unspecified (UniProt); Regulation: Expression regulation is not annotated (UniProt). Evidence: UniProt P18847, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the nucleoplasm, nucleoli and basal body. In…, Datasheet A00904-2, PMC2924561, PMC3772181. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/ATF3/immunohistochemistry-ihc-guide.