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EDEM2 / ER degradation-enhancing alpha-mannosidase-like protein 2 · IHC design guide
Design Immunohistochemistry for EDEM2
Plan EDEM2 chromogenic IHC in paraffin sections using the catalog antibody and high staining glandular tissues as reference points (HPA tissue IHC; datasheet A08174). Interpret the observed cytoplasmic pattern alongside EDEM2’s annotated ER lumen location, while accounting for medium consistency between antibody staining and RNA data (HPA tissue IHC; UniProt).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
EDEM2 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 tissue staining; ER lumen is the molecular location (HPA tissue IHC; UniProt) | |
| Staining pattern | Cytoplasmic staining in glandular cells; texture unspecified (HPA tissue IHC) | |
| Antigen retrieval | Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A08174) | |
| Positive control | Appendix+4 more · see all | |
| Negative control | Soft tissue+1 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 staining and RNA show medium consistency (HPA tissue IHC) | |
| Regulation | Broad expression; modest tissue differences (UniProt) | |
| Isoform / epitope | 2 isoforms; signal peptide 1–21 is removed; epitope coverage unknown (UniProt) |
Section 1
Recommended EDEM2 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol with one published EDEM2 IHC protocol for glioma tissue (PMC9885217).
| Sample | Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A08174) |
| Fixation | Image fixative and duration unreported (datasheet A08174); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Tris-EDTA pH 9.0 (datasheet A08174); 20 min, 95–100 °C (standard) |
| 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-EDEM2, 1:100-1:300 (datasheet A08174) |
| 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 | EDEM2-positive staining in glandular cells of appendix (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated Tris-EDTA retrieval at pH 9.0 (datasheet A08174); the published protocol does not specify retrieval (PMC9885217).
Section 2
What Is the Expected EDEM2 Staining Pattern?
EDEM2 is an endoplasmic reticulum (ER) lumen protein with no transmembrane segment (UniProt Q9BV94 topology). In paraffin IHC, expect cytoplasmic staining, especially in glandular cells of the appendix, cervix, colon, and duodenum (HPA tissue IHC: High; general cytoplasmic expression). HPA rates the tissue staining Approved, with medium consistency against RNA data and external verification pending (HPA tissue IHC: reliability).
| Cytoplasmic staining in appendix or colon glandular cells, with little staining in adjacent unstained areas. | This fits the reported high glandular cell signal (HPA tissue IHC: High) and ER lumen localisation (UniProt Q9BV94). Chromogenic IHC alone cannot establish that individual stained structures are ER (general IHC practice). |
| Predominantly nuclear or sharply cell-surface staining in an otherwise positive glandular cell population. | That compartment conflicts with ER lumen localisation (UniProt Q9BV94). Treat it as a suspect pattern; review morphology and controls before calling it EDEM2 staining (general IHC practice). |
| Strong signal appears chiefly in a cell type reported as unstained, such as soft tissue chondrocytes. | HPA reports EDEM2 as Not detected in chondrocytes (HPA tissue IHC). Check cross-reactivity and endogenous detection activity; the HPA result alone does not prove that a new signal is false (general IHC practice; HPA tissue IHC: medium consistency). |
| Brown deposit spreads across tissue, empty spaces, or many unrelated cell types without clear cell boundaries. | A widespread deposit is difficult to assign to the reported cytoplasmic pattern (HPA tissue IHC). Check background in a control without primary antibody and review blocking, washes, and detection chemistry (general IHC practice). |
| No glandular cell signal appears in a well-preserved appendix or colon section. | These are reported high-signal cell populations (HPA tissue IHC: High). First check the assay and tissue controls; one negative section cannot establish absent EDEM2 expression, particularly given HPA's medium consistency rating (general IHC practice; HPA tissue IHC: reliability). |
💡Expected EDEM2 appearanceCall a result consistent when glandular cells show clear cytoplasmic signal, potentially strong in appendix or colon (HPA tissue IHC: High); isolated nuclear, cell-surface, or diffuse deposit is suspect against ER lumen localisation (UniProt Q9BV94; general IHC practice).
| Subcellular resolution | EDEM2 is assigned to the ER lumen (UniProt Q9BV94), while HPA describes a general cytoplasmic IHC pattern (HPA tissue IHC). Interpret chromogenic signal at the cytoplasmic level; ER identity needs a more resolving assay (general IHC practice). |
| Choice of reference tissue and cell | Appendix, cervix, colon, and duodenum glandular cells are reported High; parathyroid glandular cells are Low (HPA tissue IHC). Compare the named cell population, rather than scoring a whole section as uniformly positive (general IHC practice). |
| Reported low or absent signal | HPA lists chondrocytes and spleen red pulp cells as Not detected, and several other cell populations as Low (HPA tissue IHC). These observations are comparison points, not universal negative controls: HPA reports medium consistency and pending external verification (HPA tissue IHC: reliability). |
| Protein forms | UniProt lists two isoforms, a signal peptide at residues 1–21, and four glycosylation sites (UniProt Q9BV94). The supplied sources do not map the antibody epitopes, so they do not establish which forms either IHC antibody detects (UniProt Q9BV94; HPA antibody record). |
| Antibody evidence | HPA lists HPA048353 and CAB037238 as IHC Approved (HPA antibody record). HPA's tissue profile has medium consistency with RNA data and awaits external verification; interpret an unexpected pattern with controls rather than assuming target specificity (HPA tissue IHC: reliability; general IHC practice). |
| Situation | Likely cause | Next action |
|---|---|---|
| Expected glandular cells show no chromogenic signal. | The run may have failed, or the selected cells may differ from the reported high-signal populations (HPA tissue IHC: High; general IHC practice). | Check tissue preservation and the run's positive and detection controls; compare appendix or colon glandular cells using the catalog antibody's IHC-P instructions (HPA tissue IHC: High; general IHC practice). |
| Every cell appears similarly dark. | Uniform deposit may obscure the reported cytoplasmic, cell-dependent pattern (HPA tissue IHC; general IHC practice). | Inspect a no-primary control, review blocking and washes, and assess whether detection intensity prevents cell-level scoring (general IHC practice). |
| Signal is mainly nuclear or outlines cell membranes. | Those distributions disagree with the ER lumen assignment (UniProt Q9BV94 topology). | Recheck cell morphology and controls; report the pattern as unconfirmed unless independent evidence supports the compartment assignment (general IHC practice). |
| Chondrocytes or spleen red pulp cells stain strongly. | HPA reports these populations as Not detected, although its tissue profile has medium consistency (HPA tissue IHC: reliability). | Review the no-primary control and antibody specificity evidence before assigning the signal to EDEM2 (general IHC practice). |
| A weak sample is being scored as negative. | HPA reports Low staining in parathyroid glandular cells, smooth muscle cells, and adipocytes (HPA tissue IHC). | Use a reported High glandular cell population as the positive comparison and score the relevant cell type separately (HPA tissue IHC: High; general IHC practice). |
| Can the IHC result specify an IF/ICC pattern? | HPA supplies no ICC-IF location or cell-line images for EDEM2 (HPA subcellular record). | Use ER lumen localisation only as a starting expectation (UniProt Q9BV94); assess IF/ICC localisation with its own controls and guide (general IF practice). |
Experiment evidence
IHC & IF images showing EDEM2 staining
A08174 · IHCImmunohistochemical analysis of paraffin-embedded human tonsil. 1, Antibody was diluted at 1:200 (4° overnight). 2, Tris-EDTA, pH9.0 was use
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000088298-EDEM2/tissue/cerebral+cortex#imid_15224198
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000088298-EDEM2/tissue/colon#imid_15224124
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000088298-EDEM2/tissue/liver#imid_15224141
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000088298-EDEM2/tissue/kidney#imid_15224142
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for EDEM2 IHC & IF
🧪Run appendix first: its glandular cells should stain (HPA: Appendix glandular cells, High). Use soft tissue chondrocytes as the negative tissue comparison (HPA: Soft tissue chondrocytes, Not detected). No validated negative cell type within appendix is supplied; cells lacking specific staining should show only background chromogen against the no-primary control (HPA: Appendix glandular cells, High; standard IHC practice).
Positive control tissue: Appendix (Glandular cells, HPA High)
Negative control tissue: Soft tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA carries no ICC-IF cell line for EDEM2; derive a cell-line control from the positive tissue's cell type (Glandular cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control and a host-species-matched control IgG, matching isotype for a monoclonal antibody; use EDEM2-knockout material or immunizing-peptide competition, if available, as a biological specificity control (standard IHC practice). Quench endogenous peroxidase for chromogenic detection in appendix and block endogenous biotin if using a biotin-based detection system (standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported in the supplied evidence, and the selected A08174 paraffin-section caption does not state a fixative (caption: fixative not stated). The caption uses Tris-EDTA at pH 9.0 for retrieval, but does not establish whether retrieval is required under other conditions (caption: Tris-EDTA, pH 9.0). The supplied evidence does not establish that frozen sections or IF are easier, or identify an appendix-specific artefact (HPA: Appendix glandular cells, High; HPA subcellular: no ICC-IF image cell lines listed).
HPA tissue IHC evidence for EDEM2
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.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Appendix | Glandular cells | High | Protein (IHC) | HPA → |
| Cervix | Glandular cells | High | Protein (IHC) | HPA → |
| Colon | Glandular cells | High | Protein (IHC) | HPA → |
| Duodenum | Glandular cells | High | Protein (IHC) | HPA → |
| Endometrium | Glandular cells | High | Protein (IHC) | HPA → |
Section 3
Advanced EDEM2 IHC Tips
Troubleshoot EDEM2 chromogenic IHC in paraffin sections using the selected antibody conditions, cell-specific tissue patterns, and appropriate controls.
How should I adjust antigen retrieval when EDEM2 staining is weak?
Use heat-mediated Tris-EDTA, pH 9.0, for antigen retrieval before EDEM2 chromogenic IHC (datasheet A08174). The selected paraffin tonsil image used this buffer with primary antibody at 1:200 overnight at 4°C, so retain those conditions while assessing retrieval (caption A08174). If staining remains weak, vary heating and cooling within a validated retrieval workflow while holding antibody concentration and detection constant (standard IHC practice). Run a glandular-cell reference section, such as colon, beside the test section to help distinguish retrieval failure from low expression in the cells being assessed (HPA: High in colon glandular cells; standard IHC practice).
Can fixation explain weak or uneven EDEM2 staining in paraffin sections?
The selected paraffin tonsil caption does not state a fixative, so target-specific sensitivity of EDEM2 staining to fixation is unknown (caption A08174). Record fixative identity, fixation duration, and delay before fixation for each specimen, then compare matched sections under the same Tris-EDTA pH 9.0 retrieval conditions (standard IHC practice; datasheet A08174). Assess morphology and cytoplasmic signal together, using a glandular-cell reference such as colon when available (standard IHC practice; HPA: High in colon glandular cells). If staining differs, check section integrity, retrieval, and detection alongside fixation history before assigning the difference to fixation (standard IHC practice).
Where should credible EDEM2 staining appear within tissue cells?
Assess EDEM2 as intracellular cytoplasmic chromogen at light-microscope resolution, consistent with its ER-lumen localization and the reported tissue staining profile (UniProt Q9BV94 localisation; HPA: General cytoplasmic expression). EDEM2 has no transmembrane segment and has a signal peptide at residues 1–21, so isolated plasma-membrane or nuclear staining warrants investigation (UniProt Q9BV94 topology; UniProt Q9BV94 processing). Compare the pattern with cell morphology and a glandular-cell reference such as duodenum rather than counting every diffuse brown deposit (HPA: High in duodenum glandular cells; standard IHC practice). Review a primary-omission control with the same counterstain and detection steps when localization is uncertain (standard IHC practice).
Could isoforms or epitope processing change what this antibody detects?
EDEM2 has 2 annotated isoforms, but the supplied evidence does not map this antibody’s epitope or establish isoform-specific IHC staining (UniProt Q9BV94 isoforms; caption A08174). Its signal peptide spans residues 1–21, and the annotated mature chain spans 22–578 (UniProt Q9BV94 processing). Four glycosylation sites are annotated at residues 90, 112, 289, and 450; their effect on this antibody’s staining is unestablished (UniProt Q9BV94 glycosylation; caption A08174). If specimens disagree, verify the immunogen or epitope information before proposing isoform recognition, and compare sections with identical retrieval and detection (standard IHC practice).
How can IF help assess an EDEM2 IHC pattern?
Use IF as a separate localization check, because the supplied catalog evidence describes paraffin-section IHC and provides no IF/ICC validation for this antibody (caption A08174). Multiplex EDEM2 with an appropriate glandular epithelial marker to identify the cell population being evaluated in a tissue with reported glandular-cell staining (HPA: High in colon glandular cells; standard IF practice). Choose a fluorophore in a channel with low measured tissue autofluorescence, and inspect unstained and single-label controls before interpreting overlap (standard IF practice). Since EDEM2 is reported in the ER lumen, permeabilize sufficiently for antibody access to the luminal epitope and check that the chosen treatment preserves morphology (UniProt Q9BV94 localisation; standard IF practice).
What should I check when brown EDEM2 signal appears throughout the section?
First inspect a primary-omission control to assess staining from the secondary reagent and chromogenic detection system (standard IHC practice). Apply a peroxidase block before DAB development, and compare the blocked control with the test section; these are general chromogenic workflow steps, not EDEM2-specific findings (standard IHC practice). Keep the selected primary-antibody condition of 1:200 overnight at 4°C as a documented starting point while checking wash quality and blocking (caption A08174; standard IHC practice). Judge background against cell morphology and the reported general cytoplasmic pattern, paying particular attention to diffuse extracellular deposit or staining outside intact cells (HPA: General cytoplasmic expression; standard IHC practice).
How should I quantify EDEM2 staining across tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and tissue region before scoring, then report either an H-score combining intensity and percentage positive, or the percentage of positive cells (standard IHC practice). For spatial comparisons, report positive-cell density per mm² of viable tissue and state how the analysis area was selected (standard IHC practice). Normalize cell-based scores to the number of evaluable cells in the same compartment, such as glandular cells when comparing colon sections (standard IHC practice; HPA: High in colon glandular cells). Keep retrieval, detection, counterstain, imaging, and scoring rules consistent across specimens, and exclude folds, necrosis, and damaged edges from the scored region (standard IHC practice).
How can I separate true EDEM2 staining from tissue artefacts?
A credible result places chromogen within intact cells in a broadly cytoplasmic pattern, consistent with the reported ER-lumen localization and tissue profile (UniProt Q9BV94 localisation; HPA: General cytoplasmic expression). High glandular-cell staining in colon can support comparison, whereas the reported absence in chondrocytes offers a contrasting cell-level reference rather than a universal negative control (HPA: High in colon glandular cells; HPA: Not detected in chondrocytes). Treat isolated nuclear or surface staining, section-edge enhancement, and deposits over necrotic areas as patterns requiring control review (UniProt Q9BV94 topology; standard IHC practice). Compare primary-omission and peroxidase-block controls before attributing residual DAB signal to EDEM2, particularly where endogenous enzyme activity may contribute (standard IHC practice).
Boster reagents
Best EDEM2 / ER degradation-enhancing alpha-mannosidase-like protein 2 IHC Antibodies
A08174 has real IHC data on paraffin-embedded human tonsil (A08174 IHC image caption). Human and mouse reactivity and IF are listed, but no IF image is supplied (catalog: reactivity; applications; IF image alts).
Real IHC data
Anti-EDEM2 Antibody
Cat # A08174
A08174 will render with its IHC figure from paraffin-embedded human tonsil (A08174 IHC image caption). It lists IHC and IF applications and human and mouse reactivity (catalog: applications; reactivity).
Which to pick: For tissue IHC, choose A08174: its own image documents human tonsil paraffin sections stained at 1:200 after Tris-EDTA retrieval at pH 9.0; the fixative is unreported (A08174 IHC image caption). For IF, A08174 lists a 1:50 dilution, but ICC validation and an IF image are unreported (catalog: IF dilution; applications; IF image alts). For cross-species planning, A08174 lists human and mouse reactivity and a rabbit host (catalog: reactivity; host); its tissue image documents human tonsil only (A08174 IHC image caption).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9BV94 (EDEM2_HUMAN, ER degradation-enhancing alpha-mannosidase-like protein 2).
- Human Protein Atlas. EDEM2 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. EDEM2 subcellular location (ICC-IF): Highest expression in HUVEC/TERT2: 84.8 nTPM.
- Human Protein Atlas. EDEM2 antibody validation summary (2 antibodies).
- EDEM2 is a diagnostic and prognostic biomarker and associated with immune infiltration in glioma: A comprehensive analysis. Frontiers in oncology 2022 — PMC9885217.
- Sphingolipid metabolic enzyme GLA expression in gliomas: prognostic implications and therapeutic potential. Frontiers in oncology 2026 — PMC13053272.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:12975309 — UniProt-cited evidence.
- PubMed PMID:11780052 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for EDEM2 (ER degradation-enhancing alpha-mannosidase-like protein 2). Expected localisation Cytoplasmic tissue staining; ER lumen is the molecular location (HPA tissue IHC; UniProt). Antigen retrieval: Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A08174). Validated IHC antibody: A08174 at 1:100-1:300 (the product's own IHC validation image is shown). Controls (HPA): positive Appendix (Glandular cells); negative Soft tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A08174); 2. Fixation: Image fixative and duration unreported (datasheet A08174); 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 retrieval: Tris-EDTA pH 9.0 (datasheet A08174); 20 min, 95–100 °C (standard); 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-EDEM2, 1:100-1:300 (datasheet A08174); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Antibody staining and RNA show medium consistency (HPA tissue IHC); Isoform / epitope: 2 isoforms; signal peptide 1–21 is removed; epitope coverage unknown (UniProt); Regulation: Broad expression; modest tissue differences (UniProt). Evidence: UniProt Q9BV94, HPA tissue IHC · Approved, HPA cell-line RNA · Highest expression in HUVEC/TERT2: 84.8 nTPM, Datasheet A08174, PMC9885217. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/EDEM2/immunohistochemistry-ihc-guide.