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- Table of Contents
Plan HSPB8 chromogenic IHC around cytoplasmic staining reported across several tissues (HPA tissue IHC). Use pancreatic exocrine cells as a positive reference and adipocytes as a negative reference (HPA tissue IHC); the catalog antibody A02492-2 is listed for IHC at 0.5–1 μg/mL (datasheet A02492-2).
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
| Expected localisation | Cytoplasmic staining in several tissues (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining across several tissue cell types (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6 HIER, heat-mediated (datasheet A02492-2) | |
| Positive control | Cerebral cortex+4 more · see all | |
| Negative control | Adipose tissue+3 more · see all |
| Fixation | Keep tissue fixation consistent (standard IHC practice; not target-specific); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A02492-2) | |
| Caveat | Staining has low consistency with RNA expression (HPA tissue IHC) | |
| Regulation | Heat shock drives nuclear-foci translocation (UniProt) | |
| Isoform / epitope | No listed isoforms or processing; one 1–196 chain (UniProt) |
The catalog antibody’s IHC-P protocol is accompanied by 3 published HSPB8 immunohistochemistry protocols (PMC5756276; PMC10777032; PMC4688967).
| Sample | Paraffin-embedded mouse pancreas tissues; fixative not specified (datasheet A02492-2) |
| Fixation | Image fixative and duration unreported (datasheet A02492-2); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Citrate pH 6, 20 min (datasheet A02492-2) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A02492-2) |
| Primary antibody | Rabbit anti-HSPB8, 0.5-1μg/ml (datasheet A02492-2) |
| Primary incubation | Overnight at 4 °C (datasheet A02492-2) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A02492-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | HSPB8-positive staining in neuronal cells of cerebral cortex (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several different tissue types. No signal in the no-primary control. |
HSPB8 is expected mainly in the cytoplasm, with possible nuclear staining; it has no transmembrane segment (UniProt Q9UJY1 topology and localisation; HPA: cytoplasmic tissue IHC). HPA reports high staining in selected neuronal, epithelial and glandular cells, among others (HPA: tissue IHC). Treat this as a guide to interpretation: the tissue IHC profile is Approved, with low consistency between antibody staining and RNA expression (HPA: reliability description).
| Cytoplasmic staining in cerebral cortex neurons or lung alveolar cells. | This fits reported high staining in both cell types (HPA: High in neuronal cells and alveolar cells). Assess the named cells rather than calling an entire section uniformly positive (general IHC interpretation). |
| Predominantly membrane staining, or nuclear-only staining across a section. | An isolated membrane pattern conflicts with the reported intracellular locations and lack of a transmembrane segment (UniProt Q9UJY1; HPA: cytosol supported). Nuclear staining can occur, so review its accompanying cytoplasmic signal before judging it (UniProt Q9UJY1; HPA: nucleoplasm supported). |
| Strong signal in adipocytes or bone-marrow hematopoietic cells. | Those cells are listed as not detected (HPA: adipocytes and hematopoietic cells). Check for nonspecific antibody binding or endogenous chromogenic activity with appropriate controls (general IHC practice); a discrepant section alone does not identify the cause. |
| Diffuse color over cells and surrounding tissue, without a clear cellular pattern. | This is difficult to assign to HSPB8, whose reported tissue pattern is cytoplasmic (HPA: tissue IHC). Review the no-primary control and detection background before scoring cells (general IHC practice). |
| No staining in an expected high-staining cell population. | Confirm that the expected cells are present and the assay controls worked (general IHC practice). A negative result warrants review of the run; HPA reports high staining in several specific cell populations, but its tissue profile has low antibody–RNA consistency (HPA: tissue IHC and reliability). |
| Compartment and topology | HSPB8 is reported in cytoplasm and nucleus, with no transmembrane segment (UniProt Q9UJY1). HPA tissue IHC describes cytoplasmic expression, so assess intracellular staining first (HPA: tissue IHC). |
| Choice of tissue control | Cerebral cortex neurons, lung alveolar cells and pancreatic exocrine glandular cells are reported High; adipocytes are Not detected (HPA: tissue IHC). Use the specified cell population when comparing sections, since tissue-level labels alone can obscure which cells are being scored (general IHC interpretation). |
| Strength of tissue evidence | The tissue IHC profile is Approved, with low consistency between antibody staining and RNA expression (HPA: reliability description). Interpret a discordant specimen alongside its controls; do not treat the reported pattern as an absolute result for every section (general IHC interpretation). |
| Antibody evidence | HPA015876 is listed as IHC Approved and ICC Supported (HPA: antibody validation). These are application-specific statuses; they do not establish a target-specific fixation effect or a dilution for a different assay (HPA: supplied antibody record). |
| IF/ICC Q&A: where should signal appear? | Mainly in the cytosol, with additional nucleoplasmic localisation (HPA: subcellular ICC-IF, supported). UniProt also reports movement to nuclear foci during heat shock (UniProt Q9UJY1). These observations guide localisation; this IHC section supplies no IF/ICC protocol. |
| Situation | Likely cause | Next action |
|---|---|---|
| Expected high-staining cells show no chromogenic signal. | The expected cell population may be absent from the field, or the run may have failed (general IHC practice). High staining applies to named cell populations (HPA: tissue IHC). | Locate the reported cells, then check a known-positive section and the run’s detection controls (general IHC practice). Review primary antibody use and retrieval against the assay instructions; no HSPB8-specific retrieval condition is supplied. |
| Color is confined to plasma membranes. | A dominant membrane pattern disagrees with the reported intracellular localisation and lack of a transmembrane segment (UniProt Q9UJY1; HPA: subcellular). | Compare cellular boundaries with the counterstain and check no-primary background (general IHC practice). Reassess the pattern with the validated antibody before scoring it as HSPB8. |
| Nuclei stain, but cytoplasm appears clear. | Nuclear localisation is reported, including nuclear foci during heat shock, while HPA places HSPB8 mainly in cytosol (UniProt Q9UJY1; HPA: subcellular). Nuclear-only IHC therefore needs review. | Check a positive cell population for accompanying cytoplasmic color and compare with a no-primary control (general IHC practice). Record nuclear staining separately rather than assuming it establishes the expected tissue pattern. |
| A reported not-detected cell population stains strongly. | Adipocytes and bone-marrow hematopoietic cells are listed as Not detected (HPA: tissue IHC). Nonspecific binding or endogenous detection activity are possible explanations (general IHC practice). | Verify cell identity and inspect no-primary and reagent controls; address endogenous activity according to the chromogenic detection workflow (general IHC practice). Treat the discrepancy as unresolved until controls support attribution. |
| Color is widespread and obscures cellular boundaries. | Diffuse background can interfere with reading the reported cytoplasmic pattern (HPA: tissue IHC; general IHC practice). Its appearance alone does not establish which assay step caused it. | Inspect no-primary background, blocking, antibody concentration and detection timing using the assay instructions (general IHC practice). Score only cells whose compartment can be distinguished from surrounding color. |
| IHC and IF/ICC appear to disagree on localisation. | HPA tissue IHC reports cytoplasmic expression, while supported ICC-IF also shows nucleoplasm (HPA: tissue IHC; HPA: subcellular ICC-IF). The assays and specimens provide different views (general IHC/IF interpretation). | Compare the cytosolic component first, then document nuclear signal separately (HPA: subcellular ICC-IF). Review each assay’s controls and application-specific antibody status (HPA: IHC Approved; ICC Supported; general IHC/IF practice). |
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.
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Cerebral cortex | Neuronal cells | High | Protein (IHC) | HPA → |
| Cervix | Squamous epithelial cells | High | Protein (IHC) | HPA → |
| Esophagus | Squamous epithelial cells | High | Protein (IHC) | HPA → |
| Lung | Alveolar cells | High | Protein (IHC) | HPA → |
| Pancreas | Exocrine glandular cells | High | Protein (IHC) | HPA → |
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Ovary | Ovarian stroma cells | Not detected | Protein (IHC) | HPA → |
| Spleen | Cells in red pulp | Not detected | Protein (IHC) | HPA → |
Troubleshoot HSPB8 staining in paraffin sections using the catalog antibody’s tissue image, expected localisation, and appropriate controls.
Anti-HSPB8 antibodies have IHC images from mouse and rat pancreas and human lung and mammary cancer (A02492-2 image captions), plus ICC/IF images from HeLa and A431 cells (A02492 and M02492-2 image captions).
A02492-2 shows paraffin-section IHC in mouse and rat pancreas and human lung and mammary cancer, and its catalog lists human, mouse and rat reactivity (A02492-2 image captions; catalog applications and reactivity). A02492 shows ICC/IF in HeLa cells, while M02492-2 shows ICC/IF in A431 cells (A02492 and M02492-2 image captions).
Which to pick: For tissue IHC, choose A02492-2: its own images document paraffin sections with citrate retrieval at pH 6 and 1 μg/ml primary antibody; the fixative is unreported (A02492-2 IHC image captions). For IF/ICC, choose A02492 for a rabbit polyclonal with human, mouse and rat listed reactivity, or M02492-2 for a mouse monoclonal with human and rat listed reactivity (A02492 and M02492-2 catalog applications, host, clone and reactivity). For cross-species tissue IHC, A02492-2 has image evidence in all three listed species (A02492-2 IHC image captions; catalog reactivity).