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- Table of Contents
Plan RPL32 staining in paraffin sections around its cytoplasmic tissue pattern (HPA tissue IHC). Cerebral cortex neurons and pancreatic exocrine cells show high staining, while adipocytes are listed as undetected comparators (HPA tissue IHC).
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
| Expected localisation | Cytoplasmic staining in tissue (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining in neuronal and exocrine glandular cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A06487-1) | |
| Positive control | Cerebral cortex+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
| Fixation | Keep fixation conditions consistent across sections. (standard IHC practice; not target-specific) | |
| Caveat | Staining and RNA show medium consistency; verify with controls (HPA tissue IHC) | |
| Regulation | Expression regulation is not annotated (UniProt) | |
| Isoform / epitope | No annotated isoforms; mature chain spans 2–135 (UniProt) |
The catalog antibody protocol uses heat-mediated EDTA pH 8.0 retrieval (datasheet A06487-1). One published RPL32 tissue microarray IHC protocol provides additional staining conditions (PMC7411337).
| Sample | Paraffin-embedded differentiated adenocarcinoma of the human rectum tissue; fixative not specified (datasheet A06487-1) |
| Fixation | Image fixative and duration unreported (datasheet A06487-1); 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 A06487-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A06487-1) |
| Primary antibody | Rabbit anti-RPL32, 2-5 μg/ml (datasheet A06487-1) |
| Primary incubation | Overnight at 4 °C (datasheet A06487-1) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A06487-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | RPL32-positive staining in neuronal cells of cerebral cortex (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control. |
RPL32 is a cytoplasmic component of the large ribosomal subunit, with no annotated transmembrane segment (UniProt P62910). In paraffin section IHC, expect cytoplasmic staining in neuronal cells of cerebral cortex and exocrine glandular cells of pancreas, both scored High by HPA (HPA: tissue IHC). HPA describes general cytoplasmic expression, but its Enhanced tissue profile has medium agreement with RNA data and awaits external verification (HPA: tissue IHC).
| Cytoplasmic staining in cerebral cortex neurons or pancreatic exocrine cells. | This matches the expected compartment and the two High cell populations in HPA tissue IHC (UniProt P62910; HPA: High in cerebral cortex neurons and pancreatic exocrine cells). Judge the relevant cells, rather than treating every structure in the section as an equivalent control. |
| Predominantly nuclear, membranous, or extracellular staining with little cytoplasmic signal. | That distribution conflicts with UniProt's cytoplasmic annotation and HPA's general cytoplasmic IHC profile (UniProt P62910; HPA: tissue IHC). Review morphology and detection controls before interpreting it as RPL32; the supplied evidence does not establish those compartments as an expected IHC pattern. |
| Strong staining in adipocytes, ovarian follicle cells, or skeletal muscle myocytes. | HPA reports RPL32 as Not detected in those specific cell populations (HPA: tissue IHC). Check cell identity and a no-primary control for cross-reactivity or endogenous detection activity (general IHC practice). Not detected is an assay observation, not proof that every cell lacks RPL32. |
| Diffuse chromogen over cells and surrounding tissue, obscuring cell boundaries. | A uniform haze cannot establish the cytoplasmic, cell-specific pattern described by HPA (HPA: tissue IHC). Treat it as background until a no-primary control and detection-system check distinguish nonspecific signal from interpretable staining (general IHC practice). |
| No staining in cerebral cortex neurons or pancreatic exocrine cells. | Both are High examples in HPA tissue IHC, so a blank result warrants a technical check (HPA: High in both cell populations). Confirm that the expected cells are present, then check the catalog antibody's IHC-P conditions and detection controls (general IHC practice). HPA staining does not guarantee every specimen will be positive. |
| Which cells provide a useful positive reference? | Cerebral cortex neuronal cells and pancreatic exocrine glandular cells are High; adrenal gland glandular cells and bronchial respiratory epithelial cells are Medium (HPA: tissue IHC). Choose a reference with identifiable target cells and compare staining within those cells. HPA's low tissue RNA specificity does not make all cell types equally useful controls (HPA: RNA specificity). |
| How should an HPA negative be interpreted? | Adipocytes in adipose tissue and breast, ovarian follicle cells, skeletal muscle myocytes, and soft-tissue fibroblasts are Not detected in HPA tissue IHC (HPA: tissue IHC). These are cell-level observations, not universal tissue-negative claims. Use them to assess unexpected staining only when the named cell population is identifiable. |
| What does target structure support? | RPL32 has no annotated transmembrane segment or signal peptide; UniProt places it in the cytoplasm and annotates a mature chain spanning residues 2–135 (UniProt P62910). These facts support an intracellular interpretation. They do not specify an antibody epitope, retrieval condition, or fixation sensitivity. |
| How strong is the IHC pattern evidence? | HPA lists 2 rabbit polyclonal antibodies, HPA047501 and HPA051994, with Enhanced IHC validation (HPA: antibodies). The tissue profile also reports medium agreement between staining and RNA expression and pending external verification (HPA: tissue IHC). Use its cell-level pattern as a reference while retaining that qualification. |
| IF/ICC Q&A: where is RPL32 seen? | HPA reports mainly endoplasmic reticulum and cytosol localization in ICC-IF, with both locations approved (HPA: subcellular ICC-IF). This supports an intracellular IF expectation, while the paraffin IHC comparison remains HPA's general cytoplasmic tissue pattern (HPA: tissue IHC). ICC-IF images do not establish an IHC-P protocol. |
| Situation | Likely cause | Next action |
|---|---|---|
| High reference tissue is blank. | The expected cells may be absent from the field, or an IHC workflow step may have failed; HPA scores the named cells High (HPA: tissue IHC). | Locate neurons or pancreatic exocrine cells first. Then review the catalog antibody's IHC-P instructions, retrieval, dilution, and detection setup as general IHC checks; no RPL32-specific retrieval or fixation effect is supplied. |
| Only nuclei appear positive. | Nuclear dominance conflicts with the cytoplasmic pattern reported by UniProt and HPA (UniProt P62910; HPA: tissue IHC). Counterstain or nonspecific signal may complicate interpretation (general IHC practice). | Inspect a no-primary control and distinguish chromogen from counterstain. Reassess whether cytoplasmic signal is present in the HPA High cell populations (HPA: tissue IHC). |
| Adipocytes or skeletal muscle myocytes stain strongly. | HPA scores these cell populations Not detected, making strong signal discordant with its tissue IHC observations (HPA: tissue IHC). Cross-reactivity or detection background is possible. | Confirm cell identity and compare a no-primary control. Assess the pattern alongside a High reference population before assigning the signal to RPL32 (HPA: tissue IHC; general IHC practice). |
| Chromogen is diffuse across the section. | Diffuse background can mask cell boundaries and prevent comparison with HPA's general cytoplasmic profile (HPA: tissue IHC; general IHC practice). | Check the no-primary control and the blocking, washing, and detection steps as general IHC practice. Score RPL32 only where cellular localization can be judged. |
| Signal is weak in a chosen reference. | A Medium or Low HPA cell population provides a less conspicuous reference than a High population (HPA: tissue IHC); weak signal alone does not identify the failing step. | Check the precise cell population and its HPA level. Compare cerebral cortex neurons or pancreatic exocrine cells, both High, before adjusting the IHC workflow (HPA: tissue IHC). |
| IHC looks cytoplasmic, but IF appears concentrated near the endoplasmic reticulum. | HPA reports general cytoplasmic tissue IHC and approved endoplasmic reticulum plus cytosol localization in ICC-IF (HPA: tissue IHC; HPA: subcellular ICC-IF). | Compare each result with its own assay's HPA description. An endoplasmic reticulum and cytosol IF pattern can coexist with a broader cytoplasmic chromogenic IHC appearance (HPA: subcellular ICC-IF; HPA: tissue IHC). |
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — Medium consistency between antibody staining and RNA expression data. Pending external verification.). 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 → |
| Pancreas | Exocrine glandular cells | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
| Bronchus | Respiratory epithelial cells | Medium | Protein (IHC) | HPA → |
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Ovary | Follicle cells | Not detected | Protein (IHC) | HPA → |
| Skeletal muscle | Myocytes | Not detected | Protein (IHC) | HPA → |
| Soft tissue | Fibroblasts | Not detected | Protein (IHC) | HPA → |
Troubleshoot RPL32 staining in paraffin sections by checking retrieval, compartment, controls and scoring against the reported IHC pattern.
Both antibodies have human paraffin-section IHC and cell-based IF images (image captions: A06487-1, A06487-2); Human, Mouse, and Rat are listed as reactive species (catalog: reactivity).
A06487-1 has IHC images from human rectal adenocarcinoma, esophageal squamous carcinoma, tonsil, and renal-pelvis squamous metaplasia, plus IF in MCF-7 cells (image captions: A06487-1). A06487-2 has IHC images from human colorectal, breast, and endometrial cancers and esophageal squamous carcinoma, plus IF in HeLa cells and a human breast-cancer section (image captions: A06487-2).
Which to pick: For paraffin-section chromogenic IHC, start with A06487-1 if its stated 2–5 μg/ml range is useful; its own IHC captions document EDTA pH 8.0 retrieval and DAB detection, but do not report the fixative (catalog: A06487-1 IHC dilution; IHC captions: A06487-1). For IF/ICC, consider A06487-2 when tissue IF is needed: its own captions show cell-based IF and paraffin-section IF, while A06487-1 has cell-based IF; both list IF and ICC, and clonality is unreported (catalog: applications and clone fields; IF captions: A06487-1, A06487-2). Both list Human, Mouse, and Rat reactivity, but the supplied IHC and IF images document human samples only, so verify performance in mouse or rat samples (catalog: reactivity; image captions: A06487-1, A06487-2).