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PABPC3 / Polyadenylate-binding protein 3 · IHC design guide
Design Immunohistochemistry for PABPC3
Plan paraffin-section IHC for PABPC3 using testis as a positive control, with cytoplasmic staining expected in spermatocytes and spermatids (HPA tissue IHC). This guide covers fixation consistency (standard IHC practice), a starting dilution of 1:50 for the catalog antibody (datasheet), and controls for possible cross-gene staining (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
PABPC3 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 in spermatocytes and spermatids (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic signal in spermatocytes; high in late spermatids (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen) | |
| Positive control | Testis | |
| Negative control | Adipose tissue+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 may detect protein from more than one gene (HPA tissue IHC) | |
| Regulation | Testis-enriched expression (HPA tissue RNA) | |
| Isoform / epitope | No annotated isoforms or cleavage to alter epitope mapping (UniProt) |
Section 1
Recommended PABPC3 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol with one published PABPC3 IHC protocol for ovarian tumors (PMC12624041).
| Sample | Paraffin-embedded human testis tissue; fixative not specified (datasheet A15710) |
| Fixation | Image fixative and duration unreported (datasheet A15710); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat-induced epitope retrieval in citrate buffer, pH 6.0, 20 min at 95–98 °C (standard rule: cytoplasmic / membrane antigen) |
| 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-PABPC3, 1:50 (datasheet A15710) |
| 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 | PABPC3-positive staining in elongated or late spermatids of testis (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression mainly in spermatocytes and spermatids. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6.0 retrieval at 95–98 °C for 20 min (page antigen-retrieval rule; UniProt Q9H361: cytoplasm).
Section 2
What Is the Expected PABPC3 Staining Pattern?
PABPC3 is a cytoplasmic protein with no transmembrane segment (UniProt Q9H361). In paraffin section IHC, expect cytoplasmic staining mainly in spermatocytes and spermatids; elongated or late spermatids are recorded as High (HPA: tissue IHC). HPA rates the tissue staining Approved, with medium consistency against RNA data, and cautions that the antibody targets proteins from more than one gene; the pattern awaits external verification (HPA: tissue IHC).
| Strong cytoplasmic staining in elongated or late spermatids, with staining in other spermatocytes or spermatids (HPA: tissue IHC). | This matches the reported testis pattern: elongated or late spermatids are High, and the overall profile is mainly cytoplasmic in spermatocytes and spermatids (HPA: tissue IHC). Score the cell type and compartment together; intensity alone cannot establish PABPC3 identity because HPA flags multi-gene antibody targeting (HPA: tissue IHC). |
| Predominantly nuclear or membrane-edge staining in the expected germ cells (HPA: tissue IHC; UniProt Q9H361 topology). | This conflicts with the reported cytoplasmic location and absence of a transmembrane segment (HPA: tissue IHC; UniProt Q9H361). Treat it as a localisation mismatch and check morphology, counterstain alignment, detection background and antibody specificity using general IHC practice. |
| Prominent staining in adipocytes or adrenal glandular cells (HPA: tissue IHC). | These listed cells are Not detected in the HPA tissue panel (HPA: tissue IHC). Consider cross-reactivity or endogenous detection activity as possible IHC explanations; the HPA warning about multi-gene targeting makes antibody specificity especially relevant (HPA: tissue IHC). |
| Diffuse chromogen across tissue, with little separation between cells or compartments (general IHC practice). | A diffuse deposit cannot be confidently assigned to the cytoplasm of spermatocytes or spermatids, the reported pattern (HPA: tissue IHC). Review blocking, washes, antibody concentration and detection controls under general IHC practice before interpreting weak cell-specific staining. |
| No discernible cytoplasmic signal in elongated or late spermatids of testis (HPA: tissue IHC). | This misses the HPA High reference population (HPA: tissue IHC). First confirm that those cells are present and identifiable, then review the IHC run and its controls under general IHC practice; a blank slide alone does not establish absent PABPC3. |
💡Expected PABPC3 appearanceCall positive when elongated or late spermatids show High cytoplasmic staining in testis (HPA: tissue IHC); predominantly nuclear or membrane-edge staining conflicts with the expected location (HPA: tissue IHC; UniProt Q9H361 topology).
| Cell population and tissue choice (HPA: tissue IHC; UniProt Q9H361 tissue specificity) | Testis is the HPA RNA-enriched tissue and UniProt describes PABPC3 as testis specific; HPA reports High staining in elongated or late spermatids (HPA: tissue IHC; UniProt Q9H361). Select a section in which those cells can be identified before judging a negative result. |
| Compartment and protein topology (HPA: tissue IHC; UniProt Q9H361) | HPA reports cytoplasmic staining mainly in spermatocytes and spermatids, consistent with UniProt's cytoplasmic annotation and lack of a transmembrane segment (HPA: tissue IHC; UniProt Q9H361). Compartment is therefore part of the interpretation, alongside intensity. |
| Antibody evidence and specificity (HPA: tissue IHC; HPA: antibodies) | The tissue IHC profile is Approved but has medium consistency with RNA data, cautions that the antibody targets proteins from more than one gene, and awaits external verification (HPA: tissue IHC). HPA045423 is IHC Approved; HPA067156 has no stated IHC status in the supplied antibody record (HPA: antibodies). |
| Reference negatives and low staining (HPA: tissue IHC) | Adipocytes in adipose tissue and glandular cells in adrenal gland are Not detected; neuronal cells in cerebral cortex are listed as Low (HPA: tissue IHC). A weak signal in a Low category should not be interpreted in the same way as strong staining in a listed negative cell population. |
| Situation | Likely cause | Next action |
|---|---|---|
| Testis looks blank where elongated or late spermatids should be High (HPA: tissue IHC). | The reference cells may be absent from the viewed area, or the IHC run may have failed; the slide alone cannot distinguish these possibilities (HPA: tissue IHC; general IHC practice). | Check cell morphology and counterstain, then review the run control, antigen retrieval and antibody dilution as general IHC practice. No target-specific fixation sensitivity is established by the supplied sources. |
| Signal is mainly nuclear or outlines membranes in germ cells (HPA: tissue IHC; UniProt Q9H361). | The distribution disagrees with HPA's cytoplasmic pattern and UniProt's cytoplasmic, non-transmembrane annotation; mislocalised detection or nonspecific staining is possible (HPA: tissue IHC; UniProt Q9H361). | Compare signal with the counterstain and tissue morphology; inspect detection controls and repeat scoring by compartment under general IHC practice. |
| Adipose adipocytes or adrenal glandular cells stain strongly (HPA: tissue IHC). | Both are HPA Not detected populations; antibody cross-reactivity or endogenous detection activity are possible explanations, not diagnoses from this observation alone (HPA: tissue IHC; general IHC practice). | Review negative and detection controls and, where relevant to the chromogen system, endogenous activity blocking as general IHC practice. Interpret persistent staining with HPA's multi-gene targeting caution (HPA: tissue IHC). |
| Diffuse deposit obscures the cytoplasmic pattern expected in germ cells (HPA: tissue IHC). | General IHC causes include excess antibody, insufficient washing or nonspecific detection; this appearance cannot reliably resolve the reported cell pattern (general IHC practice; HPA: tissue IHC). | Check the reagent-only control, blocking, dilution and wash steps as general IHC practice; reassess only when cells and compartments can be distinguished. |
| A weak signal appears in cerebral cortex neuronal cells (HPA: tissue IHC). | HPA lists these cells as Low, so faint staining there is not equivalent to the High elongated or late spermatid reference pattern (HPA: tissue IHC). | Record cell identity, compartment and relative intensity; compare with the testis reference and controls before assigning specificity (HPA: tissue IHC; general IHC practice). |
| What should a separate IF/ICC assessment show? | HPA reports cytosol as the approved main IF/ICC location, while cautioning that the underlying antibodies target proteins from multiple genes (HPA: subcellular ICC-IF). | Expect a cytosolic localisation readout and retain the multi-gene specificity caveat (HPA: subcellular ICC-IF); use the separate IF/ICC guide for its workflow. |
Experiment evidence
IHC & IF images showing PABPC3 staining
A15710 · IHCImmunohistochemistryt analysis of paraffin-embedded human testis, using PABPC3 Antibody. The lane on the right is blocked with the PABPC3 pe
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000151846-PABPC3/tissue/cerebral+cortex#imid_20210853
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000151846-PABPC3/tissue/colon#imid_20210771
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000151846-PABPC3/tissue/liver#imid_20210788
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000151846-PABPC3/tissue/kidney#imid_20210773
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA045423; green = PABPC3, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA045423; green = PABPC3, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for PABPC3 IHC & IF
🧪Run testis first and look for staining in elongated or late spermatids (HPA: High). Use adipose tissue as the negative tissue, with adipocytes at background (HPA: Not detected); on the testis slide, compare staining with neighboring cells outside the identified spermatid population, without assuming those cells are target-negative (HPA: High in elongated or late spermatids only).
Positive control tissue: Testis (Elongated or late spermatids, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show PABPC3 in A-431, U-251MG, U2OS, RT-4, ASC52telo, with annotated localisation: Cytosol (approved) (HPA subcellular).
Technical controls: Include a no-primary (secondary-only) control and a control antibody matched to the primary antibody’s host species and clonality; a target knockout or PABPC3 peptide block provides a biological specificity control (standard IHC practice; A15710 caption: peptide block). For chromogenic testis IHC, quench endogenous peroxidase and check for endogenous biotin if using biotin-based detection (standard IHC practice).
⚠️Feasibility: A target-specific fixation window and its effect on staining are unreported, and the fixative is unreported in the selected A15710 paraffin-section caption (A15710 caption). Antigen-retrieval dependence is unreported, and the supplied evidence does not establish whether frozen sections or IF are easier than paraffin IHC (supplied target/application evidence). Score the spermatid compartment by morphology and assess background with the testis-slide controls (HPA: High in elongated or late spermatids; standard IHC practice).
HPA tissue IHC evidence for PABPC3
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Medium consistency between antibody staining and RNA expression data. Caution, targets protein from more than one gene. Pending external verification.). 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 |
|---|---|---|---|---|
| Testis | Elongated or late spermatids | High | 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 → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Endometrium | Cells in endometrial stroma | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced PABPC3 IHC Tips
Troubleshoot PABPC3 staining against its expected testis distribution and cytoplasmic localisation, while checking antibody specificity (UniProt Q9H361; HPA tissue IHC).
What retrieval conditions should I try when PABPC3 staining is weak?
Use citrate pH 6.0 HIER at 95–98 °C for 20 min on paraffin sections (page retrieval specification). Run a human testis section beside the study sections, because the selected catalog antibody has paraffin-section testis staining with peptide blocking (A15710 tissue-IHC caption). Compare signal in spermatocytes and spermatids with background outside those cells, using the reported cytoplasmic pattern as a guide (HPA tissue IHC). If staining remains weak, check deparaffinisation and retrieval temperature before changing conditions; record any adjusted time as an optimisation, since the caption supplies neither fixation nor retrieval details (A15710 tissue-IHC caption; standard IHC practice).
Could fixation explain weak or uneven PABPC3 staining?
Target-specific sensitivity to fixation is unknown: the selected paraffin-section caption does not state a fixative (A15710 tissue-IHC caption). Record the fixative, fixation duration, tissue thickness and processing history for each block, then compare similarly processed sections with the same retrieval and detection settings (standard IHC practice). Use a human testis section as a staining reference and assess the expected cytoplasmic signal in spermatocytes and spermatids (HPA tissue IHC; UniProt Q9H361 subcellular location). If blocks processed under different conditions disagree, test matched material prospectively before assigning the difference to PABPC3 abundance; the available caption cannot establish which fixation condition preserves this antigen best (A15710 tissue-IHC caption).
How should I evaluate nuclear or membrane-like PABPC3 staining?
Evaluate PABPC3 primarily as cytoplasmic staining in testis germ cells: UniProt places it in the cytoplasm, and HPA reports staining mainly in spermatocytes and spermatids (UniProt Q9H361 subcellular location; HPA tissue IHC). Its annotated sequence has no transmembrane segment, so a crisp cell-surface rim needs a specificity check (UniProt Q9H361 topology). Review nuclear counterstain alignment, section folds and neighbouring structures under brightfield before calling a compartment shift (standard IHC practice). Compare the pattern with a peptide-blocked section where feasible, as peptide blocking was shown for the selected catalog antibody in paraffin-embedded human testis (A15710 tissue-IHC caption).
Can an epitope or related protein explain unexpected staining?
The supplied UniProt record lists 0 isoforms for PABPC3, so an isoform-specific staining explanation lacks support here (UniProt Q9H361 isoform record). PABPC3 contains four RNA recognition motifs and a PABC domain, while the selected antibody caption does not identify its epitope (UniProt Q9H361 domains; A15710 tissue-IHC caption). HPA cautions that its staining antibodies target proteins from more than one gene, so its tissue pattern alone cannot establish PABPC3 specificity for the catalog antibody (HPA tissue IHC). Check the catalog antibody’s stated immunogen or epitope separately, and interpret peptide blocking as evidence of peptide-dependent binding rather than proof of unique gene recognition (A15710 tissue-IHC caption; standard IHC practice).
How can I check PABPC3 localisation with multiplex immunofluorescence?
For a separate IF/ICC experiment, pair PABPC3 with a validated spermatocyte or spermatid marker if examining testis, because those are the reported staining populations in tissue IHC (HPA tissue IHC). Choose fluorophores and filter sets after measuring tissue autofluorescence in an unstained section, and reserve the cleaner channel for the weaker target signal (standard IF practice). Include a mild permeabilisation step for access to the cytosolic antigen; PABPC3 is cytoplasmic and has no annotated transmembrane segment (UniProt Q9H361 subcellular location and topology). Validate the antibody and fixation conditions for IF independently, since the selected caption documents paraffin-section IHC rather than IF performance (A15710 tissue-IHC caption).
How do I separate PABPC3 signal from chromogenic background?
Inspect a no-primary control alongside the testis reference to locate detection-reagent, pigment or endogenous-enzyme signal before scoring PABPC3 (standard IHC practice). For peroxidase and DAB detection, apply a peroxidase block and assess whether diffuse brown staining persists in the control; these are general workflow steps, not PABPC3-specific evidence (standard IHC practice). Titrate the catalog antibody and detection exposure against the expected cytoplasmic germ-cell pattern, retaining morphology with a suitable counterstain (HPA tissue IHC; standard IHC practice). If widespread staining remains, compare a peptide-blocked section where feasible, while recognising that the selected caption demonstrates peptide blocking in human testis but does not establish gene-exclusive binding (A15710 tissue-IHC caption).
What is a defensible way to quantify PABPC3 IHC? ⚠ ANSWER MARKED FOR VERIFICATION
Define the analysis region and germ-cell population before scoring, because HPA reports cytoplasmic expression mainly in spermatocytes and spermatids (HPA tissue IHC). Report the percentage of positive cells and an intensity-weighted H-score, using consistent thresholds and separating the relevant cell populations if morphology permits (standard IHC practice). Normalise each result to the number of evaluable cells in that population, or report positive-cell density per mm² of viable analysed tissue when cell counting is impractical (standard IHC practice). Keep retrieval, detection, imaging and counterstain settings comparable across sections, and exclude folds or damaged areas from the measured region (standard IHC practice).
When should an apparent PABPC3-positive cell be considered artefactual?
Give most weight to cytoplasmic signal in spermatocytes or spermatids, the pattern reported for PABPC3 in testis (HPA tissue IHC; UniProt Q9H361 subcellular location). Question dominant nuclear staining, a sharp membrane rim or staining concentrated at a section edge, and check morphology before assigning such signal to PABPC3 (UniProt Q9H361 subcellular location and topology; standard IHC practice). Exclude necrotic or folded areas and compare no-primary and peroxidase-block controls when brown deposits could reflect endogenous enzyme activity (standard IHC practice). Even a plausible pattern needs a specificity caveat: HPA flags antibodies targeting proteins from more than one gene, while the selected catalog image shows peptide blocking only (HPA tissue IHC; A15710 tissue-IHC caption).
Boster reagents
Best PABPC3 / Polyadenylate-binding protein 3 IHC Antibodies
The human-reactive anti-PABPC3 antibody A15710 has a paraffin-section testis IHC image (A15710 catalog reactivity; IHC image caption). IF is listed, but no IF image is supplied (A15710 catalog applications; IF image alts).
Real IHC data
Anti-PABP3 PABPC3 Antibody
Cat # A15710
SKU A15710 will render with an IHC image of paraffin-embedded human testis and a peptide-blocked comparison (A15710 IHC image caption). Its listed applications include IHC and IF, but the catalog supplies no IF image (A15710 catalog applications; IF image alts).
Which to pick: Choose A15710 for human paraffin-section IHC: it is a rabbit polyclonal antibody with an IHC image of human testis; the fixative is unreported (A15710 catalog host/dilution_raw; IHC image caption). A15710 is also the IF-listed option, although no IF or ICC image is supplied (A15710 catalog applications; IF image alts). No cross-species choice is supported because A15710 lists human reactivity only (A15710 catalog reactivity).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9H361 (PABP3_HUMAN, Polyadenylate-binding protein 3).
- Human Protein Atlas. PABPC3 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. PABPC3 subcellular location (ICC-IF): Localized to the cytosol. Caution: Based on antibodies targeting proteins from multiple genes..
- Human Protein Atlas. PABPC3 antibody validation summary (2 antibodies).
- PABPC3 drives ovarian cancer metastasis and drug sensitivity by downregulating CLDN1 expression. Cell death & disease 2025 — PMC12624041.
- PubMed PMID:11328870 — UniProt-cited evidence.
- PubMed PMID:11230166 — UniProt-cited evidence.
- PubMed PMID:15489334 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for PABPC3 (Polyadenylate-binding protein 3). Expected localisation Cytoplasmic staining in spermatocytes and spermatids (HPA tissue IHC). Antigen retrieval: Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen). Validated IHC antibody: A15710 at 1:50 (the product's own IHC validation image is shown). Controls (HPA): positive Testis (Elongated or late spermatids); negative Adipose tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded human testis tissue; fixative not specified (datasheet A15710); 2. Fixation: Image fixative and duration unreported (datasheet A15710); 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-induced epitope retrieval in citrate buffer, pH 6.0 , 20 min at 95–98 °C…; 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-PABPC3, 1:50 (datasheet A15710); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Antibody may detect protein from more than one gene (HPA tissue IHC); Isoform / epitope: No annotated isoforms or cleavage to alter epitope mapping (UniProt); Regulation: Testis-enriched expression (HPA tissue RNA). Evidence: UniProt Q9H361, HPA tissue IHC · Approved, HPA ICC-IF · cytosol. Caution: Based on antibodies targeting proteins from…, Datasheet A15710, PMC12624041. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/PABPC3/immunohistochemistry-ihc-guide.