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- Table of Contents
Plan chromogenic TNFSF12 IHC-P with the catalog antibody at 5–10 μg/mL on formaldehyde-fixed paraffin sections (datasheet A02009-2). Compare staining with the reported cytoplasmic tissue pattern, while accounting for uncertain tissue IHC reliability and a secreted form (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 most tissues (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining in most tissues; plasma positivity (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6 HIER, heat-mediated (datasheet A02009-2) | |
| Positive control | Adrenal gland+4 more · see all | |
| Negative control | Bone marrow+4 more · see all |
| Fixation | Formaldehyde-fixed paraffin sections were used (selected-SKU IHC image A02009-2) | |
| Caveat | Secreted protein can complicate RNA–protein correlation (HPA tissue IHC) | |
| Regulation | Expression regulation unspecified (UniProt) | |
| Isoform / epitope | 2 isoforms; secreted form lacks the cytoplasmic epitope (UniProt) |
The catalog antibody protocol uses citrate pH 6 retrieval (datasheet A02009-2). The published protocol below provides an IHC workflow for FFPE tumor and mucosal sections (PMC13371701).
| Sample | Formaldehyde-fixed, paraffin-embedded human brain tissue (datasheet A02009-2) |
| Fixation | Image formalin-fixed; duration unreported (datasheet A02009-2); 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 (datasheet A02009-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% serum (datasheet A02009-2) |
| Primary antibody | Rabbit anti-TNFSF12, 5-10 μg/mL (datasheet A02009-2) |
| 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 | TNFSF12-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in most tissues. Positivity in plasma. No signal in the no-primary control. |
TNFSF12 can be membrane-associated or secreted (UniProt O43508 topology and processing). In tissue IHC, expect mainly cytoplasmic staining in cell populations reported positive by HPA, including glandular cells, cardiomyocytes and skeletal myocytes (HPA tissue IHC). HPA also reports plasma positivity, so extracellular signal needs context (HPA tissue IHC). Treat the pattern as provisional: HPA rates tissue reliability Uncertain because the antibodies may detect proteins from more than one gene (HPA tissue IHC).
| Cytoplasmic staining in duodenal or small-intestinal glandular cells, cardiomyocytes, or skeletal myocytes (HPA tissue IHC). | These are reported high-staining cell populations (HPA tissue IHC). A cytoplasmic pattern fits the tissue survey (HPA tissue IHC), although UniProt also places membrane-form TNFSF12 at the cell membrane and describes a secreted form (UniProt O43508 topology and processing). Neither the compartment nor a high score alone proves that the antibody detects TNFSF12 specifically: HPA rates tissue reliability Uncertain (HPA tissue IHC). |
| A sharply nuclear-only pattern in an otherwise positive cell population. | Nuclear-only staining falls outside HPA’s mainly cytoplasmic tissue profile and UniProt’s membrane/secreted annotation (HPA tissue IHC; UniProt O43508 subcellular location). Suspect an artefact or an unintended target before assigning biological meaning. Compare with a no-primary control and the expected cell distribution (general IHC practice); the supplied sources do not establish a nuclear TNFSF12 pattern. |
| Strong staining confined to a cell population HPA reports as not detected, such as liver cholangiocytes (HPA tissue IHC). | That distribution conflicts with the reported cell-level result (HPA tissue IHC). Cross-reactivity is plausible given HPA’s multi-gene targeting caution; endogenous chromogenic detection activity is another general IHC possibility (HPA tissue IHC; general IHC practice). Neither cause follows from the image alone. Check detection controls and antibody specificity before scoring those cells as positive. |
| Color spread diffusely across cells, stroma, and nominally negative regions. | An indiscriminate deposit is less consistent with HPA’s reported cell-type differences, including high glandular staining and undetected cholangiocytes (HPA tissue IHC). Diffuse color may reflect detection background or extracellular material; plasma positivity is reported, and TNFSF12 has a secreted form (HPA tissue IHC; UniProt O43508 processing). Use morphology and controls to distinguish these possibilities (general IHC practice). |
| No signal in a reported high-staining control, such as heart cardiomyocytes (HPA tissue IHC). | First question whether the IHC run worked: inspect the control section, detection reagents, and antigen-retrieval settings against the antibody’s validated IHC procedure (general IHC practice). A failed positive control prevents interpretation of a negative study section. Persistent failure may reflect antibody performance; HPA marks its listed IHC antibody HPA052967 Uncertain (HPA antibodies). |
| Antibody specificity and validation | HPA rates tissue reliability Uncertain, cautions that antibodies target proteins from more than one gene, and lists HPA052967 IHC as Uncertain (HPA tissue IHC; HPA antibodies). Interpret location and intensity alongside controls; apparent agreement with a reported pattern does not independently verify target identity (general IHC practice). |
| Membrane form, shedding, and epitope position | UniProt describes a membrane chain spanning residues 1–249, an extracellular region at 43–249, and a secreted chain at 94–249 (UniProt O43508 topology and processing). Whether an antibody detects both forms depends on its epitope, which is not supplied here. Extracellular color cannot by itself distinguish secreted TNFSF12 from background. |
| Isoforms | UniProt lists two isoforms, including TWE-PRIL (UniProt O43508 isoforms). The payload gives no isoform-specific antibody recognition. Avoid assigning a tissue pattern to one isoform from IHC appearance alone; record the antibody’s documented epitope or isoform coverage if available (general IHC practice). |
| Tissue and cell choice | HPA reports high IHC staining in heart cardiomyocytes but no detection in lung alveolar cells or spleen red-pulp cells (HPA tissue IHC). UniProt reports high expression in lung and spleen at the tissue level (UniProt O43508 tissue specificity). These statements address different measurements and populations; select and score controls at the specified cell level. |
| IF/ICC interpretation? | HPA reports vesicular ICC-IF localization as approved, with a caution that antibodies target proteins from multiple genes (HPA subcellular). Vesicular IF can inform a compartment check, but it does not establish the expected chromogenic IHC pattern or resolve the tissue antibody’s Uncertain reliability (HPA subcellular; HPA tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| High-staining reference tissue is blank (HPA tissue IHC). | The run may have failed at detection or retrieval, or the antibody may perform poorly in this preparation (general IHC practice). HPA lists its IHC antibody as Uncertain (HPA antibodies). | Review the positive-control section and reagent steps, then repeat using the antibody’s documented IHC conditions (general IHC practice). Withhold a negative call on study tissue until the reference stains. |
| Nominally negative cells stain strongly, such as liver cholangiocytes (HPA tissue IHC). | Cross-reactivity is credible under HPA’s multi-gene targeting caution; endogenous detection activity can also produce color (HPA tissue IHC; general IHC practice). | Run a no-primary control and assess whether color follows the suspect cells or the detection chemistry (general IHC practice). Keep the finding provisional until antibody specificity is supported. |
| Staining is predominantly nuclear. | This differs from HPA’s cytoplasmic tissue profile and UniProt’s membrane/secreted annotation (HPA tissue IHC; UniProt O43508 subcellular location). | Check morphology, no-primary control, and the distribution in a reported positive tissue (general IHC practice). Do not score isolated nuclear color as the expected TNFSF12 pattern. |
| Color is diffuse across tissue and control regions. | General detection background is possible (general IHC practice). Plasma positivity and a secreted TNFSF12 form also complicate extracellular interpretation (HPA tissue IHC; UniProt O43508 processing). | Compare no-primary and positive-tissue sections; assess whether color tracks recognizable cells, plasma, or the whole section (general IHC practice). Resolve diffuse background before scoring intensity. |
| Lung or spleen appears negative despite UniProt’s high tissue-expression listing (UniProt O43508 tissue specificity). | HPA reports no detection specifically in lung alveolar cells and spleen red-pulp cells; its tissue IHC reliability is Uncertain (HPA tissue IHC). | Identify and score the sampled cell population, then compare the corresponding HPA cell-level result (HPA tissue IHC). Avoid treating a tissue-wide expression listing as a guarantee of staining in every cell. |
| A reported high-staining population shows variable intensity between sections (HPA tissue IHC). | Section-to-section staining variability or differing cell composition may affect an IHC comparison (general IHC practice); the supplied sources give no TNFSF12-specific fixation sensitivity. | Compare the same cell population on concurrently processed positive controls and review the documented IHC procedure (general IHC practice). Report the observed range rather than assuming that a processing step changed TNFSF12 epitope access. |
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Uncertain — Caution, targets protein from more than one gene. At least one protein variant secreted, tissue location of RNA and protein might differ and correlation is complex. 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 |
|---|---|---|---|---|
| Adrenal gland | Glandular cells | High | Protein (IHC) | HPA → |
| Duodenum | Glandular cells | High | Protein (IHC) | HPA → |
| Heart muscle | Cardiomyocytes | High | Protein (IHC) | HPA → |
| Rectum | Glandular cells | High | Protein (IHC) | HPA → |
| Skeletal muscle | Myocytes | High | Protein (IHC) | HPA → |
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Liver | Cholangiocytes | Not detected | Protein (IHC) | HPA → |
| Lung | Alveolar cells | Not detected | Protein (IHC) | HPA → |
| Nasopharynx | Respiratory epithelial cells | Not detected | Protein (IHC) | HPA → |
| Salivary gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
Troubleshoot TNFSF12 staining in paraffin sections by checking retrieval, compartment, controls, and scoring before interpreting chromogenic signal.
A02009-2 has IHC data from formaldehyde-fixed, paraffin-embedded human and mouse brain tissue and IF data from paraformaldehyde-fixed mouse brain tissue (catalog image captions).
A02009-2 is listed for IHC-P and IF in human and mouse, with IHC images from human and mouse brain tissue (catalog applications/reactivity; IHC captions). Its IF image shows mouse brain tissue (IF caption).
Which to pick: Choose A02009-2 for paraffin-section IHC in human or mouse brain: both captions report formaldehyde fixation, citrate-buffer heat retrieval and overnight primary incubation (IHC captions). For IF, A02009-2 has a mouse brain image at 20 μg/mL; ICC validation is unreported (IF caption; catalog application list). It is the listed cross-species IHC choice because its reactivity includes human and mouse and its IHC captions show both species (catalog reactivity; IHC captions).