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MEN1 / Menin · IHC design guide
Design Immunohistochemistry for MEN1
Plan chromogenic MEN1 IHC in paraffin sections using the catalog antibody’s documented workflow (datasheet A00331-1). Assess nuclear staining with matched controls, bearing in mind that tissue-IHC reliability is uncertain (HPA tissue IHC; standard IHC practice).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
MEN1 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 | Nuclear tissue staining; reliability uncertain (HPA tissue IHC) | |
| Staining pattern | Nuclear staining in several tissues (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A00331-1) | |
| Positive control | Adipose tissue+4 more · see all | |
| Negative control | Bronchus+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific) | |
| Caveat | Cytoplasmic staining was disregarded (HPA tissue IHC) | |
| Regulation | Ubiquitous expression (UniProt) | |
| Isoform / epitope | 3 isoforms; verify epitope coverage (UniProt) |
Section 1
Recommended MEN1 IHC & IF Protocols
The catalog antibody uses EDTA pH 8.0 retrieval (datasheet A00331-1). The published IHC protocols below cover parathyroid tumors and pancreatic neuroendocrine tumors (PMC10270278; PMC11106174; PMC5564808).
| Sample | Paraffin-embedded human lung cancer tissue; fixative not specified (datasheet A00331-1) |
| Fixation | Image fixative and duration unreported (datasheet A00331-1); 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 A00331-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A00331-1) |
| Primary antibody | Rabbit anti-MEN1, 2-5μg/ml (datasheet A00331-1) |
| Primary incubation | Overnight at 4 °C (datasheet A00331-1) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A00331-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | MEN1-positive staining in adipocytes of adipose tissue (HPA tissue IHC: Medium). HPA tissue profile: Nuclear expression in several tissues. No signal in the no-primary control. |
💡Decision noteStart with EDTA pH 8.0 heat retrieval for the catalog antibody (datasheet A00331-1). Treat published dilutions and retrieval conditions as specific to the antibodies used in those studies (PMC10270278; PMC11106174; PMC5564808).
Section 2
What Is the Expected MEN1 Staining Pattern?
MEN1 is a nuclear protein without a transmembrane segment (UniProt O00255: subcellular location; topology). In paraffin-section IHC, expect nuclear staining in the cell types reported by HPA, including adipocytes, adrenal glandular cells and cerebral cortical glial cells (HPA tissue IHC). Use these as provisional references: HPA rates the tissue IHC pattern Uncertain because staining and RNA expression show low consistency, and it disregards observed cytoplasmic staining (HPA tissue IHC).
| Defined nuclear staining in adrenal glandular cells, adipocytes or cerebral cortical glial cells. | This matches MEN1's nuclear location (UniProt O00255: subcellular location) and HPA's Medium staining in these cells (HPA tissue IHC). Assess nuclei against the counterstain and nearby unstained structures (general IHC practice). A matching pattern supports interpretation, but HPA's tissue IHC reliability remains Uncertain (HPA tissue IHC). |
| Strong cytoplasmic staining with weak or absent nuclear staining. | Treat this as a compartment mismatch for paraffin-section IHC: MEN1 is nuclear (UniProt O00255: subcellular location), and HPA disregarded observed cytoplasmic tissue staining (HPA tissue IHC). Consider nonspecific antibody binding or detection background (general IHC practice). Cytosol reported by HPA ICC-IF is Uncertain and does not validate a cytoplasmic IHC result (HPA subcellular ICC-IF). |
| Prominent staining in bronchial respiratory epithelium while reference nuclei are unstained. | HPA reports bronchial respiratory epithelial cells as Not detected, so this pattern warrants a specificity check (HPA tissue IHC). Possible explanations include cross-reactivity or endogenous chromogenic detection activity (general IHC practice). HPA's uncertain tissue reliability means the bronchus result is a comparator, not an absolute exclusion rule (HPA tissue IHC). |
| A diffuse chromogen haze covers nuclei and surrounding tissue. | The haze prevents a confident nuclear call (general IHC practice; UniProt O00255: subcellular location). Review blocking, washes, primary-antibody concentration and the detection-only control as general IHC checks (general IHC practice). Do not score the haze as MEN1 expression solely because the section includes an HPA-listed positive cell type (HPA tissue IHC). |
| No nuclear signal in adrenal glandular cells or adipocytes. | Both cell types have Medium staining in HPA's tissue IHC observations (HPA tissue IHC). First check section quality, retrieval conditions, antibody and detection controls as general IHC practice. A negative result alone cannot establish absent MEN1: HPA rates its tissue IHC evidence Uncertain (HPA tissue IHC). |
💡Expected MEN1 appearanceCall a result positive when discrete nuclear chromogen is visible in an HPA-listed cell type, such as adrenal glandular cells or adipocytes with reported Medium staining; predominantly cytoplasmic color or diffuse haze is suspect in tissue IHC (HPA tissue IHC; UniProt O00255: subcellular location; general IHC practice).
| Nuclear location and topology (UniProt O00255) | Menin is nuclear, can concentrate in nuclear body-like structures, and has no transmembrane segment (UniProt O00255: subcellular location; topology). Score nuclear staining; do not infer a membrane pattern from this record. |
| Tissue and cell-type variation (HPA tissue IHC) | HPA reports Medium staining in selected adipocytes, glandular cells, glia and colon endothelial cells, but Not detected in selected bronchial epithelium and lung alveolar cells (HPA tissue IHC). Compare the specified cell types, rather than treating an entire organ as uniformly positive or negative. |
| Strength of IHC evidence (HPA tissue IHC; HPA antibodies) | The tissue profile is Uncertain; antibody HPA030342 is also rated Uncertain for IHC (HPA tissue IHC; HPA antibodies). Reproducible nuclear staining and appropriate controls increase confidence in an experiment, but these source ratings do not establish a validated positive tissue. |
| Isoforms and processing (UniProt O00255) | UniProt lists 3 isoforms and a Menin chain spanning residues 1–610, with no annotated signal peptide or propeptide (UniProt O00255: isoforms; processing). The payload gives no antibody epitope, so it cannot establish which isoforms an IHC reagent detects. |
| Does ICC-IF predict this IHC pattern? (HPA subcellular ICC-IF) | HPA supports nucleoplasmic ICC-IF staining and marks additional cytosol localization Uncertain (HPA subcellular ICC-IF). Use that result as context for nuclear localization; judge paraffin-section chromogenic staining against HPA tissue IHC, which disregards cytoplasmic staining (HPA tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| No signal in an HPA-listed Medium cell type (HPA tissue IHC). | The workflow may have failed, or this specimen may differ from HPA's observation; the reference pattern is Uncertain (general IHC practice; HPA tissue IHC). | Check section integrity and run appropriate positive and detection controls; review retrieval, primary-antibody dilution and detection according to the assay instructions (general IHC practice). |
| Cytoplasmic color dominates the slide. | The pattern conflicts with the nuclear tissue-IHC expectation and may reflect nonspecific staining or background (UniProt O00255: subcellular location; HPA tissue IHC; general IHC practice). | Compare a detection-only control, review blocking and washes, and score nuclear staining separately; do not use uncertain ICC-IF cytosol localization to validate tissue IHC (general IHC practice; HPA subcellular ICC-IF). |
| Bronchial respiratory epithelium stains strongly. | HPA reports this cell type as Not detected; cross-reactivity or endogenous detection activity is possible (HPA tissue IHC; general IHC practice). | Inspect the detection-only control and an HPA-listed nuclear reference on the same run; interpret the mismatch cautiously because HPA tissue IHC reliability is Uncertain (general IHC practice; HPA tissue IHC). |
| Chromogen obscures nuclear boundaries. | High background or excessive signal can prevent compartment scoring (general IHC practice). | Review primary-antibody concentration, detection development, blocking and washes; use the counterstain to judge whether color is truly nuclear (general IHC practice). |
| Adrenal glandular cells and adipocytes give different results. | HPA lists Medium staining in both, but its tissue profile has low consistency with RNA data and is rated Uncertain (HPA tissue IHC). | Record the cell type, nuclear fraction and intensity in each section; check controls before treating one discordant specimen as proof of absent or present MEN1 (general IHC practice; HPA tissue IHC). |
| An IF image shows cytosolic signal alongside nuclear signal. | HPA supports nucleoplasmic ICC-IF localization but rates additional cytosol localization Uncertain (HPA subcellular ICC-IF). | Assess the nuclear signal and IF controls within the separate IF/ICC workflow; for this chromogenic IHC guide, retain the HPA tissue-IHC nuclear criterion (general IF practice; HPA tissue IHC). |
Experiment evidence
IHC & IF images showing MEN1 staining
A00331-1 · IHCIHC analysis of Menin/MEN1 using anti-Menin/MEN1 antibody (A00331-1). Menin/MEN1 was detected in a paraffin-embedded section of human lung c
A00331-1 · IHCIHC analysis of MEN1 using anti-MEN1 antibody (A00331-1). MEN1 was detected in a paraffin-embedded section of human bladder cancer tissue. H
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000133895-MEN1/tissue/cerebral+cortex#imid_8004519
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000133895-MEN1/tissue/colon#imid_8001701
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000133895-MEN1/tissue/liver#imid_8001694
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000133895-MEN1/tissue/kidney#imid_8001703
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA030342; green = MEN1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA030342; green = MEN1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for MEN1 IHC & IF
🧪Run adrenal gland first: its glandular cells should show MEN1 staining (HPA: Medium in adrenal gland glandular cells). Use bronchus respiratory epithelium as the low-signal comparator (HPA: Not detected); on the positive slide, unstained neighboring cells should remain at background, although no specific internal negative cell type is established by the supplied HPA rows.
Positive control tissue: Adipose tissue (Adipocytes, HPA Medium)
Negative control tissue: Bronchus (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show MEN1 in A-431, U-251MG, U2OS, with annotated localisation: Nucleoplasm (supported) (HPA subcellular).
Technical controls: Include no-primary (secondary-only) and concentration-matched rabbit IgG isotype controls (caption: rabbit primary; standard IHC practice). A MEN1-knockout specimen provides a biological negative; quench endogenous peroxidase and compare adrenal tissue with the no-primary slide for DAB background (standard IHC practice).
⚠️Feasibility: A MEN1-specific fixation window or fixation effect is unreported, and the selected A00331-1 paraffin-section caption does not state the fixative (caption). Heat-mediated retrieval with EDTA at pH 8.0 is documented, but whether retrieval is required is unreported (caption). IHC on paraffin sections has a documented example; no supplied comparison establishes frozen sections or IF as easier, so assess adrenal background before interpreting weak staining (caption; standard IHC practice).
HPA tissue IHC evidence for MEN1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Uncertain — Low consistency between antibody staining and RNA expression data. Cytoplasmic staining was viewed as observed and disregarded.). 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 |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Medium | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
| Caudate | Glial cells | Medium | Protein (IHC) | HPA → |
| Cerebral cortex | Glial cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Bronchus | Respiratory epithelial cells | Not detected | Protein (IHC) | HPA → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Endometrium | Cells in endometrial stroma | Not detected | Protein (IHC) | HPA → |
| Fallopian tube | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Gallbladder | Glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced MEN1 IHC Tips
Use nuclear localisation and matched controls to troubleshoot MEN1 staining in paraffin sections; assess IF/ICC separately.
How should I adjust retrieval when nuclear MEN1 staining is weak?
Start with heat-mediated retrieval in EDTA at pH 8.0 for paraffin sections (datasheet A00331-1). The selected image used this retrieval before overnight incubation at 4°C with 2 μg/ml antibody (datasheet A00331-1). If nuclei remain weak, vary heating time in small increments while keeping the buffer and antibody concentration fixed, and compare sections from the same block. Inspect tissue integrity and background alongside nuclear signal, since excessive retrieval can make a brighter slide harder to interpret (standard IHC practice). Include a no-primary control and score staining in intact nuclei rather than treating diffuse cytoplasmic color as recovered MEN1 (UniProt O00255 localisation; HPA tissue IHC reliability: Uncertain).
Could fixation explain weak or patchy MEN1 staining?
The selected tissue image establishes paraffin embedding, but its caption does not state the fixative; target-specific fixation sensitivity is therefore unknown (datasheet A00331-1). Record fixation type and duration for each specimen before comparing MEN1 staining across cases (standard IHC practice). On serial sections, keep EDTA retrieval at pH 8.0, antibody at 2 μg/ml, and overnight incubation at 4°C constant while assessing specimen handling (datasheet A00331-1). Compare well-preserved central tissue with damaged edges and necrotic areas, and use the same nuclear scoring rule throughout (standard IHC practice). Do not interpret a fixation-associated staining difference as altered MEN1 expression without an independent control.
What should I do when MEN1 looks predominantly cytoplasmic?
Prioritise nuclear staining: MEN1 is annotated in the nucleus, including nuclear body-like structures (UniProt O00255 localisation). HPA reports mainly nucleoplasmic localisation in IF/ICC, while its additional cytosolic localisation is uncertain (HPA subcellular). Its tissue IHC reliability is Uncertain, and cytoplasmic staining was disregarded in that assessment (HPA tissue IHC). Check whether DAB precipitate, tissue folds, or counterstain obscure nuclear boundaries, then compare the finding with a no-primary control (standard IHC practice). Score nuclear and cytoplasmic signal separately across intact cells; require reproducible, anatomically coherent nuclear staining before treating a cytoplasmic-only pattern as MEN1 evidence.
How can epitope choice affect MEN1 staining across sections?
MEN1 has 3 annotated isoforms and a 1–610 menin chain; the supplied product caption does not identify the antibody epitope (UniProt O00255 isoforms and processing; datasheet A00331-1). Confirm the immunogen or mapped epitope before assuming that every isoform should stain equivalently. MEN1 has no annotated transmembrane segment and has reported phosphorylation sites at residues 487, 543, and 594 (UniProt O00255 topology and modified residues). Do not attribute a staining difference to phosphorylation or isoform loss without epitope information and orthogonal evidence. Keep retrieval at EDTA pH 8.0 while comparing serial sections so processing changes do not confound that assessment (datasheet A00331-1).
How should I evaluate MEN1 by IF/ICC alongside a cell-type marker?
Treat IF/ICC as a separate optimisation: the supplied antibody evidence describes paraffin-section chromogenic IHC, with no IF/ICC protocol for this SKU (datasheet A00331-1). Pair MEN1 with a validated marker for the cell type being assessed and a nuclear counterstain, then inspect signal within individual nuclei. Choose fluorophores after checking tissue autofluorescence and single-label controls; reserve a well-separated channel for the weaker signal (standard IF practice). MEN1 has no transmembrane segment and is mainly nucleoplasmic, so optimise permeabilisation for intracellular nuclear access while monitoring morphology (UniProt O00255 topology; HPA subcellular). HPA also lists uncertain cytosolic localisation; document nuclear and cytosolic fluorescence separately rather than pooling them into one score (HPA subcellular).
How can I reduce diffuse DAB background without losing nuclear signal?
The selected image used 10% goat serum blocking, 2 μg/ml primary antibody overnight at 4°C, and a peroxidase-conjugated secondary for 30 minutes at 37°C (datasheet A00331-1). First compare a no-primary section and a matched section with the primary antibody; distinguish secondary or reagent background from antibody-associated staining. Check the peroxidase block, wash steps, and DAB development time as general chromogenic IHC controls (standard IHC practice). If background persists, titrate primary concentration around the documented value while holding retrieval and development constant. Judge improvement by nuclear contrast in intact cells, since HPA disregarded cytoplasmic tissue staining and rated its IHC profile Uncertain (HPA tissue IHC).
What is a defensible way to quantify MEN1 in paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the analysed compartment as the nucleus before scoring, consistent with MEN1 localisation and the reported tissue IHC profile (UniProt O00255 localisation; HPA tissue IHC). Record the percentage of positive nuclei and, if intensity is reproducible, calculate a nuclear H-score from the percentages at 0, 1+, 2+, and 3+ intensity (standard IHC practice). Normalise counts to evaluable nuclei within the same annotated cell population, and report excluded necrotic or damaged regions. Keep section thickness, EDTA pH 8.0 retrieval, staining batch, imaging, and threshold rules consistent (datasheet A00331-1; standard IHC practice). Report cytoplasmic staining separately and qualify conclusions because HPA rates tissue IHC reliability Uncertain (HPA tissue IHC).
When is a MEN1-positive cell credible rather than an artefact?
A credible result has reproducible signal in intact nuclei, matching MEN1's annotated nuclear localisation and HPA's nuclear tissue profile (UniProt O00255 localisation; HPA tissue IHC). Review the counterstain to identify cell boundaries, and compare staining within the intended annotated cell population rather than across mixed cell types. Discount signal confined to section edges, folds, or necrotic tissue, and check a no-primary control for endogenous enzyme activity or DAB background (standard IHC practice). Interpret cytoplasmic-only color cautiously: HPA disregarded cytoplasmic tissue staining and rated tissue IHC reliability Uncertain (HPA tissue IHC). Use a consistent nuclear threshold across cases, and seek an independent assay before concluding that discordant staining reflects altered MEN1 abundance.
Boster reagents
Best MEN1 / Menin IHC Antibodies
A00331-1 has a real human paraffin-section IHC figure (catalog image caption); M00331 lists human IHC and IF/ICC applications, with no IF figure supplied (catalog applications; image payload).
Real IHC data
Anti-Menin/MEN1 ® Antibody
Cat # A00331-1
A00331-1 will render with IHC staining shown in human lung cancer paraffin sections; its listed reactivity is human, mouse and rat (catalog image caption; catalog reactivity). M00331 will render with human IHC and IF/ICC listed, but no IHC or IF image caption was supplied (catalog applications; image payload).
Which to pick: For tissue IHC, choose A00331-1: its own caption documents EDTA pH 8.0 retrieval and staining at 2 μg/ml in a human lung cancer paraffin section; the fixative is unreported (catalog image caption). For IF/ICC, M00331 is the listed option, a rabbit monoclonal clone ACBA-13 with human reactivity and a 1:50 IF dilution; no IF image is supplied (catalog clone, reactivity, dilution and image payload). For mouse or rat IHC, choose A00331-1 based on its listed reactivity and IHC application; its supplied images show human tissue only (catalog reactivity and applications; catalog image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry O00255 (MEN1_HUMAN, Menin).
- Human Protein Atlas. MEN1 tissue IHC expression (reliability: Uncertain).
- Human Protein Atlas. MEN1 subcellular location (ICC-IF): Mainly localized to the nucleoplasm. In addition localized to the cytosol..
- Human Protein Atlas. MEN1 antibody validation summary (1 antibodies).
- Diagnostic Utility of Menin Immunohistochemistry in Patients With Multiple Endocrine Neoplasia Type 1 Syndrome. The American journal of surgical pathology 2023 — PMC10270278.
- Syndromic MEN1 parathyroid adenomas consist of both subclonal nodules and clonally independent tumors. Virchows Archiv : an international journal of pathology 2024 — PMC11106174.
- [Protein Expression Levels of the DCAF4-MEN1-hTERT Axis in Patients With Colon Adenocarcinoma and Their Relationship With Clinicopathological Characteristics and Prognosis]. Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 2026 — PMC13095818.
- DAXX/ATRX and MEN1 genes are strong prognostic markers in pancreatic neuroendocrine tumors. Oncotarget 2017 — PMC5564808.
- PubMed PMID:9103196 — UniProt-cited evidence.
- PubMed PMID:16554811 — UniProt-cited evidence.
- PubMed PMID:17555499 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for MEN1 (Menin). Expected localisation Nuclear tissue staining; reliability uncertain (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A00331-1). Validated IHC antibody: A00331-1 at 2-5μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Adipose tissue (Adipocytes); negative Bronchus. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human lung cancer tissue; fixative not specified (datasheet A00331-1); 2. Fixation: Image fixative and duration unreported (datasheet A00331-1); 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: EDTA pH 8.0 (datasheet A00331-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A00331-1); 8. Primary antibody: Rabbit anti-MEN1, 2-5μg/ml (datasheet A00331-1); 9. Primary incubation: Overnight at 4 °C (datasheet A00331-1). Watch for: Fixation: Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific); Caveat: Cytoplasmic staining was disregarded (HPA tissue IHC); Isoform / epitope: 3 isoforms; verify epitope coverage (UniProt); Regulation: Ubiquitous expression (UniProt). Evidence: UniProt O00255, HPA tissue IHC · Uncertain, HPA ICC-IF · Mainly localized to the nucleoplasm. In addition localized to the…, Datasheet A00331-1, PMC10270278, PMC11106174. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/MEN1/immunohistochemistry-ihc-guide.