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- Table of Contents
Plan chromogenic GSK3B IHC in paraffin sections with the IHC-validated antibody A00791-3 (datasheet A00791-3). Use the predominantly cytoplasmic tissue pattern and abundant CNS staining as benchmarks (HPA tissue IHC), and check whether your antibody detects total GSK3B or phospho-Ser9 (datasheet M00791-1).
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
| Expected localisation | Predominantly cytoplasmic tissue staining (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining, most abundant in CNS and testis (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A00791-3) | |
| Positive control | Caudate+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
| Fixation | Keep fixation consistent across sections (standard IHC practice; not target-specific) | |
| Caveat | Phospho-Ser9 staining may differ from total GSK3B (datasheet M00791-1) | |
| Regulation | AKT1 phosphorylates Ser9 (UniProt) | |
| Isoform / epitope | 2 isoforms; confirm epitope coverage (UniProt) |
The catalog antibody uses EDTA pH 8.0 retrieval (datasheet A00791-3). One published astrocytoma IHC protocol provides a pH 6.0 alternative (PMC10137203).
| Sample | Paraffin-embedded human breast cancer tissue; fixative not specified (datasheet A00791-3) |
| Fixation | Image fixative and duration unreported (datasheet A00791-3); 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 A00791-3); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A00791-3) |
| Primary antibody | Rabbit anti-GSK3B, 2-5 μg/ml (datasheet A00791-3) |
| Primary incubation | Overnight at 4 °C (datasheet A00791-3) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A00791-3) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | GSK3B-positive staining in neuronal cells of caudate (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in most tissues, most abundant in CNS and testis. No signal in the no-primary control. |
In paraffin section IHC, expect predominantly cytoplasmic GSK3B staining across many tissues, with strong staining in neuronal cells of the caudate, cerebral cortex and hippocampus and in cerebellar molecular layer cells (HPA: tissue IHC). GSK3B is also annotated in the nucleus and at the cell membrane and has no transmembrane segment (UniProt P49841: localization and topology). HPA rates its tissue IHC pattern Approved, with medium RNA agreement and external verification pending (HPA: reliability).
| Strong cytoplasmic staining in caudate, cortical or hippocampal neuronal cells, or cerebellar molecular layer cells. | This matches the reported high staining in those cells (HPA: tissue IHC). Judge the distribution within identifiable cells, rather than treating all cells in a positive section as equally positive; the reported result is cell specific (HPA: tissue IHC). |
| Signal appears only in vessel lumens, extracellular material or a uniform edge deposit, without convincing cellular staining. | Those patterns do not match the reported cellular cytoplasmic tissue pattern (HPA: tissue IHC). Check section morphology, chromogen precipitate and detection controls (general IHC practice). Nuclear or membrane associated staining alone is not automatically artefactual because UniProt also lists those compartments (UniProt P49841: localization). |
| Strong staining appears in cardiomyocytes, adipocytes or skeletal myocytes while expected positive cells stain. | HPA reports those cell types as not detected (HPA: tissue IHC). Investigate antibody cross reactivity and, with peroxidase detection, endogenous activity using appropriate controls (general IHC practice). A discrepant result warrants review; HPA's Approved tissue pattern still awaits external verification (HPA: reliability). |
| Weak, even colour covers cells and surrounding tissue with little separation between positive and negative structures. | The pattern is hard to score as specific cellular staining (general IHC practice). Review blocking, antibody concentration, washing and detection controls (general IHC practice). Compare neuronal cells reported high with cell types reported not detected on appropriately processed sections (HPA: tissue IHC). |
| No signal is visible in neuronal cells of a caudate, cerebral cortex or hippocampus section. | These are reported high staining cells, so an absent result calls for a run and specimen check (HPA: tissue IHC). Verify the IHC antibody's stated application, retrieval and detection steps, then inspect tissue preservation and controls (general IHC practice). Absence in one run does not establish biological loss. |
| Tissue and cell choice | HPA reports high staining in selected CNS cells, medium staining in appendix, breast and colon glandular cells, and no detection in adipocytes or cardiomyocytes (HPA: tissue IHC). Choose comparison cells by identity, not by organ name alone (general IHC practice). |
| Compartment and phosphorylation | UniProt lists cytoplasm, nucleus and cell membrane; it specifically links the phosphorylated form to cytoplasm and membrane (UniProt P49841: localization). A total GSK3B IHC pattern cannot by itself assign phosphorylation state or kinase activity (general IHC interpretation). |
| Isoform and epitope coverage | Two isoforms and a kinase domain at residues 56–340 are annotated (UniProt P49841: isoforms and domains). The supplied record gives no catalog antibody epitope, so it cannot establish which isoforms that antibody detects; consult its validated application and epitope documentation. |
| IF/ICC Q: Must its pattern match tissue IHC? | A: HPA describes mainly nucleoplasmic signal in ICC-IF, while tissue IHC is predominantly cytoplasmic (HPA: subcellular ICC-IF; HPA: tissue IHC). Assess each application against its own evidence; this section supplies no IF/ICC protocol. |
| Situation | Likely cause | Next action |
|---|---|---|
| Known high staining neuronal cells are blank. | A failed retrieval, primary incubation or detection step is possible (general IHC practice); the cells are reported high (HPA: tissue IHC). | Check the catalog antibody's IHC-P instructions, retrieval settings and reagent controls, then repeat with an appropriate positive section (general IHC practice). |
| The whole section develops brown colour. | Excess detection background or endogenous peroxidase activity may obscure cellular signal in chromogenic IHC (general IHC practice). | Review peroxidase blocking, washes and a primary-omission detection control; score only discernible cellular staining (general IHC practice). |
| Cells reported not detected stain strongly. | Cross reactivity or detection background is possible; HPA reports no detection in adipocytes, cardiomyocytes and skeletal myocytes (HPA: tissue IHC). | Check cell identity and compare positive and negative controls; investigate specificity before interpreting the unexpected signal (general IHC practice). |
| Only extracellular deposits or section edges stain. | Precipitate or uneven reagent coverage is possible (general IHC practice); this differs from HPA's cellular cytoplasmic pattern (HPA: tissue IHC). | Inspect morphology and reagent coverage, review washes and repeat with controls before assigning a cellular score (general IHC practice). |
| Nuclear staining appears alongside cytoplasmic staining. | Nuclear localization is annotated by UniProt, and HPA reports nucleoplasmic ICC-IF staining (UniProt P49841: localization; HPA: subcellular ICC-IF). | Record compartments separately and verify the IHC signal with controls; do not infer phosphorylation from compartment alone (general IHC interpretation). |
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — 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 |
|---|---|---|---|---|
| Caudate | Neuronal cells | High | Protein (IHC) | HPA → |
| Cerebellum | Cells in molecular layer | High | Protein (IHC) | HPA → |
| Cerebral cortex | Neuronal cells | High | Protein (IHC) | HPA → |
| Hippocampus | Neuronal cells | High | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | 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 → |
| Heart muscle | Cardiomyocytes | Not detected | Protein (IHC) | HPA → |
| Lung | Alveolar cells | Not detected | Protein (IHC) | HPA → |
| Skeletal muscle | Myocytes | Not detected | Protein (IHC) | HPA → |
Troubleshoot GSK3B staining in paraffin sections by checking retrieval, compartment, controls and scoring before interpreting a chromogenic signal.
These GSK3B antibodies have IHC images from human paraffin sections; catalog IF/ICC applications include human samples, with mouse and rat reactivity listed for selected products (catalog applications, reactivity and image captions).
A00791-3 shows IHC staining in human breast cancer, ovarian cancer, endometrial adenocarcinoma and spleen; M00791 shows staining in human colon, prostate, small cell lung and pancreatic cancers (catalog IHC image captions). M00791-1 shows phospho-Ser9 staining in human breast carcinoma, while P00791-1 shows phospho-Ser9 staining in human kidney; both list IHC and IF applications (catalog IHC image captions and applications).
Which to pick: For total GSK3B tissue IHC, choose A00791-3 for its documented paraffin-section workflow with EDTA retrieval at pH 8.0 and 2 μg/ml primary antibody; its IHC caption does not report the fixative (A00791-3 IHC image caption). For IF/ICC, A00791-3 has a documented U2OS cell IF example, while M00791 lists both IF and ICC; choose a phospho-Ser9 antibody only when that modification is the target (A00791-3 IF image caption; M00791 applications; M00791-1 short description; P00791-1 title). For cross-species work, A00791-3 lists human, mouse and rat reactivity; M00791 and M00791-1 list human and mouse, while P00791-1 lists human only (catalog reactivity).