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CREM / cAMP-responsive element modulator · IHC design guide
Design Immunohistochemistry for CREM
Plan chromogenic CREM IHC in paraffin sections using nuclear staining in spermatocytes and spermatids as the tissue benchmark (HPA tissue IHC). This guide covers fixation consistency, antibody titration, and interpretation across 29 isoforms (UniProt).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
CREM 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 in spermatocytes and spermatids (HPA tissue IHC) | |
| Staining pattern | Nuclear staining in spermatocytes and spermatids (HPA tissue IHC) | |
| Antigen retrieval | Tris-EDTA pH 8.0 HIER, heat-mediated (datasheet A04379-1) | |
| Positive control | Testis+4 more · see all | |
| Negative control | Adipose tissue+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 | Isoform variation may affect antibody recognition (UniProt) | |
| Regulation | High in round or early spermatids (HPA tissue IHC) | |
| Isoform / epitope | 29 isoforms; check epitope coverage (UniProt) |
Section 1
Recommended CREM IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol (datasheet A04379-1) with four published CREM IHC protocols (PMC8329441; PMC5013872; PMC6389866; PMC3572472).
| Sample | Paraffin-embedded Human brain tissue; fixative not specified (datasheet A04379-1) |
| Fixation | Image fixative and duration unreported (datasheet A04379-1); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Tris-EDTA pH 8.0 (datasheet A04379-1); 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-CREM, 1:100-1:300 (datasheet A04379-1) |
| 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 | CREM-positive staining in round or early spermatids of testis (HPA tissue IHC: High). HPA tissue profile: Nuclear expression in spermatocytes and spermatids. No signal in the no-primary control. |
💡Decision noteStart with Tris-EDTA pH 8.0 heat retrieval for the catalog antibody (datasheet A04379-1); optimize against the published retrieval conditions for your sample (PMC8329441; PMC5013872; PMC6389866).
Section 2
What Is the Expected CREM Staining Pattern?
CREM is a nuclear and cytoplasmic transcriptional regulator with no transmembrane segment (UniProt Q03060). In paraffin sections, the clearest expected IHC signal is nuclear staining in testicular spermatocytes and spermatids, strongest in round or early spermatids (HPA tissue IHC: Enhanced; High in round or early spermatids). Interpret staining by cell type and compartment together: HPA reports additional, generally medium staining in selected epithelial cells (HPA tissue IHC).
| Strong nuclear chromogen in round or early spermatids, with nuclear staining in spermatocytes. | This matches the reference pattern. HPA rates round or early spermatids High and describes nuclear expression in spermatocytes and spermatids (HPA tissue IHC: Enhanced). |
| Testicular signal is predominantly diffuse cytoplasmic, with little nuclear staining. | Treat this as a localisation mismatch and possible staining artefact against the HPA tissue pattern (HPA tissue IHC: nuclear expression). Cytoplasmic CREM remains biologically plausible, so compartment alone cannot establish antibody specificity (UniProt Q03060: nucleus; cytoplasm). |
| Strong staining appears in adipocytes or lymph node germinal center cells. | These cell types are listed as Not detected (HPA tissue IHC). Cross-reactivity or endogenous detection activity is possible; a positive result there needs controls before it is attributed to CREM (general IHC practice). |
| Brown haze covers tissue, including cells expected to have little signal. | A widespread, poorly localised deposit cannot be scored as the expected cell-specific nuclear pattern (HPA tissue IHC). Excess background from staining or detection is a possible cause (general IHC practice). |
| No signal appears in round or early spermatids on a testis section. | That conflicts with the High reference staining (HPA tissue IHC). Check section quality and the staining run before calling the sample CREM-negative; absence of chromogen alone does not identify the failed step (general IHC practice). |
💡Expected CREM appearanceA convincing positive is High nuclear staining in round or early spermatids; dominant diffuse cytoplasmic staining or broad brown haze is a warning pattern (HPA tissue IHC; UniProt Q03060: nucleus and cytoplasm).
| Reference tissue and antibody validation | Testis round or early spermatids provide a High-staining reference, while HPA lists both HPA001818 and CAB018352 as IHC Enhanced (HPA tissue IHC; HPA antibodies). Those ratings support the reported pattern; they do not validate every antibody or staining run. |
| Cell type and compartment | HPA describes nuclear staining in spermatocytes and spermatids, but also Medium staining in goblet and selected glandular cells (HPA tissue IHC). UniProt lists both nucleus and cytoplasm; do not require every positive tissue to resemble testis. |
| Isoforms and antibody epitope | UniProt lists 29 CREM isoforms and identifies isoform 14 as the major testis activator (UniProt Q03060). No epitope is supplied here, so isoform coverage and any isoform-specific staining difference cannot be predicted for an antibody. |
| Protein features and target-specific limits | CREM has no signal peptide or transmembrane segment; its recorded chain spans residues 1–345 and includes several phosphorylated serines (UniProt Q03060). These facts do not establish antigen-retrieval conditions or fixation sensitivity; neither is reported in the supplied sources. |
| IF/ICC Q: What compartment should be checked? | A: Expect mainly nucleoplasmic signal, with additional vesicle localisation (HPA subcellular ICC-IF: nucleoplasm supported; vesicles approved). This ICC-IF observation informs localisation checks; it is not an IHC-P staining protocol or a substitute for the tissue IHC pattern. |
| Situation | Likely cause | Next action |
|---|---|---|
| Testis positive control has weak or absent staining. | Possible section, retrieval, primary-antibody, or detection failure (general IHC practice); round or early spermatids are expected to stain High (HPA tissue IHC). | Review tissue morphology and run controls, then optimise retrieval and primary concentration within the IHC-validated antibody's instructions; compare nuclear signal in round or early spermatids (general IHC practice; HPA tissue IHC). |
| Testis staining is mostly cytoplasmic rather than nuclear. | The distribution conflicts with the HPA testis pattern, although UniProt also lists cytoplasm as a CREM location (HPA tissue IHC; UniProt Q03060). | Check nuclear counterstain and cell identity, reduce background, and compare an independently validated IHC antibody if available; avoid scoring cytoplasmic colour alone as the reference pattern (general IHC practice; HPA tissue IHC). |
| Strong colour appears in an HPA Not detected cell type. | Cross-reactivity or endogenous detection activity could explain the discrepancy; HPA lists adipocytes and lymph node germinal center cells as Not detected (HPA tissue IHC; general IHC practice). | Inspect a no-primary control and evaluate endogenous-enzyme blocking for the chromogenic system; repeat with a validated antibody before assigning the colour to CREM (general IHC practice). |
| Diffuse brown background obscures nuclei. | Excess reagent, inadequate blocking, or insufficient washing can produce diffuse signal (general IHC practice). The expected testis pattern is cell-specific and nuclear (HPA tissue IHC). | Titrate the primary antibody, review blocking and wash steps, and compare with a no-primary control; score only cells whose nuclear signal remains distinguishable (general IHC practice). |
| The no-primary control develops brown deposits. | Primary-antibody-independent colour points to the detection system or tissue activity, not a demonstrated CREM signal (general IHC practice). | Check reagent controls and apply the appropriate endogenous-activity block for the chromogen system, then rerun the control alongside the testis reference section (general IHC practice; HPA tissue IHC: High in round or early spermatids). |
Experiment evidence
IHC & IF images showing CREM staining
A04379-1 · IHCImmunohistochemical analysis of paraffin-embedded Human brain. Antibody was diluted at 1:100 (4° overnight). High-pressure and temperature T
A04379 · IHCImmunohistochemistry (IHC) analyzes of CREM (I106) pAb in paraffin-embedded human liver carcinoma tissue at 1:100.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000095794-CREM/tissue/cerebral+cortex#imid_5129420
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000095794-CREM/tissue/colon#imid_5129354
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000095794-CREM/tissue/liver#imid_5129347
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000095794-CREM/tissue/kidney#imid_5129348
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody CAB018352; green = CREM, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody CAB018352; green = CREM, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for CREM IHC & IF
🧪Run testis first; round or early spermatids should stain (HPA: High in round or early spermatids). Use adipose tissue as the negative comparator (HPA: Not detected in adipocytes); on the testis slide, assess cells outside the stained spermatid population for background, without assuming they lack CREM (standard IHC practice).
Positive control tissue: Testis (Round or early spermatids, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show CREM in A-431, U-251MG, U2OS, with annotated localisation: Nucleoplasm (supported) (HPA subcellular).
Technical controls: Include no-primary (secondary-only) and host-species- and immunoglobulin-class-matched isotype controls, matched as closely as possible to the primary antibody’s clonality and concentration (standard IHC practice). Use CREM knockout tissue or peptide preabsorption as a biological specificity control (standard IHC practice; selected-SKU caption: peptide-preabsorbed control), and quench endogenous peroxidase before chromogenic detection in testis sections (standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected-SKU paraffin-section caption does not state its fixative (selected-SKU caption: fixative unreported). The caption uses high-pressure, high-temperature Tris-EDTA retrieval at pH 8.0, but does not establish that CREM staining depends on that method (selected-SKU caption: Tris-EDTA, pH 8.0); HPA lists ICC-IF images, but the supplied evidence does not establish whether IF or frozen sections are easier (HPA subcellular: ICC-IF images in A-431, U-251MG and U2OS). In testis, distinguish staining in round or early spermatids from nonspecific chromogen background by cell morphology and the negative controls (HPA: High in round or early spermatids; standard IHC practice).
HPA tissue IHC evidence for CREM
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data.). 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 |
|---|---|---|---|---|
| Testis | Round or early spermatids | High | Protein (IHC) | HPA → |
| Appendix | Goblet cells | Medium | Protein (IHC) | HPA → |
| Colon | Goblet cells | Medium | Protein (IHC) | HPA → |
| Duodenum | Goblet cells | Medium | Protein (IHC) | HPA → |
| Endometrium | Glandular cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Caudate | Glial cells | Not detected | Protein (IHC) | HPA → |
| Cerebral cortex | Endothelial cells | Not detected | Protein (IHC) | HPA → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Esophagus | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced CREM IHC Tips
Troubleshoot CREM staining in paraffin sections by checking retrieval, nuclear localisation and cell type before interpreting chromogenic signal (datasheet A04379-1; HPA tissue IHC).
How should I optimise retrieval when CREM nuclear staining is weak?
Start with heat-mediated Tris-EDTA at pH 8.0 for CREM paraffin-section IHC (datasheet A04379-1). The selected image used high-pressure, high-temperature retrieval in that buffer and 1:100 antibody overnight at 4 °C; its fixative was unreported (A04379-1 tissue-IHC caption). If staining remains weak, compare shorter and longer heating exposures on adjacent sections while holding antibody dilution and detection constant, then assess nuclear signal in round or early spermatids (HPA tissue IHC: high in testis round or early spermatids; standard IHC practice). Include an unretrieved section and a no-primary control to distinguish improved epitope exposure from retrieval damage or nonspecific chromogen deposition (standard IHC practice).
Could fixation explain weak CREM staining in my paraffin sections?
Target-specific CREM sensitivity to fixation is unknown from the supplied evidence; the selected paraffin-section caption does not state a fixative (A04379-1 tissue-IHC caption). Record the fixative, fixation duration, tissue thickness and processing history for each specimen before comparing staining across cases (standard IHC practice). On matched sections, keep Tris-EDTA retrieval at pH 8.0 and the antibody dilution constant while evaluating whether a change in processing improves nuclear signal (datasheet A04379-1; standard IHC practice). Examine morphology and a no-primary control alongside CREM staining, because poor preservation and chromogenic background can complicate interpretation independently of target-specific fixation sensitivity (standard IHC practice).
Should I accept cytoplasmic CREM staining as a positive result?
Prioritise nuclear staining when assessing paraffin-section CREM IHC: tissue profiling reports nuclear expression in spermatocytes and spermatids (HPA tissue IHC). CREM is annotated in both nucleus and cytoplasm, and subcellular imaging mainly places it in nucleoplasm with an additional vesicular location, so cytoplasmic signal requires separate validation (UniProt Q03060 subcellular; HPA subcellular). Compare nuclear and cytoplasmic chromogen within the same identified cell population, using a counterstain and a no-primary control to check cellular boundaries and background (standard IHC practice). If staining is exclusively cytoplasmic, review retrieval, detection background and antibody specificity before counting those cells as CREM positive (HPA tissue IHC; standard IHC practice).
Can this IHC result identify a specific CREM isoform or phosphorylation state?
A positive chromogenic stain alone cannot assign a CREM isoform: the record lists 29 isoforms with activator and repressor functions (UniProt Q03060 isoforms; UniProt Q03060 function). Isoform 14 is the major activator form in testes, but that annotation does not establish which forms this antibody detects (UniProt Q03060 tissue specificity). CREM contains a KID region at residues 88–147, a bZIP region at 286–345, and annotated phosphoserines, so an epitope claim needs antibody-specific mapping and validation (UniProt Q03060 domains; UniProt Q03060 modified residues; standard IHC practice). Check the catalog antibody’s immunogen and any isoform or phospho-specific validation before interpreting differences in nuclear stain as changes in a particular molecular form (standard IHC practice).
How can I check CREM localisation with tissue immunofluorescence?
For a separate IF experiment, pair CREM with a validated marker that identifies the expected spermatocyte or spermatid population, then inspect whether CREM overlaps nuclei within those cells (HPA tissue IHC; standard IF practice). Select a fluorophore channel after checking the specimen’s autofluorescence, and include single-label controls when multiplexing to identify bleed-through (standard IF practice). CREM has no transmembrane segment and is annotated in nucleus and cytoplasm, so choose permeabilisation that gives antibody access to intracellular epitopes and confirm the outcome against cell morphology (UniProt Q03060 topology; UniProt Q03060 subcellular; standard IF practice). Keep IF results distinct from chromogenic IHC evidence because the supplied A04379-1 image documents paraffin-section IHC (A04379-1 tissue-IHC caption).
What should I change when CREM chromogen appears across the whole section?
First compare the stained slide with a no-primary control and the selected caption’s peptide-preabsorbed control to locate signal that persists without specific primary-antibody binding (A04379-1 tissue-IHC caption; standard IHC practice). Check whether broad staining follows tissue edges, damaged areas or endogenous peroxidase activity before changing the antibody concentration (standard IHC practice). Apply an appropriate peroxidase block, optimise protein blocking and washes, and monitor DAB development on matched sections; these are general chromogenic workflow steps (standard IHC practice). Then titrate around the caption’s 1:100 overnight condition while retaining nuclear staining in the expected cell population as the readout (A04379-1 tissue-IHC caption; HPA tissue IHC; standard IHC practice).
How should I quantify CREM staining across paraffin-section samples? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and nuclear scoring rule before reviewing cases; HPA reports high CREM staining in testis round or early spermatids (HPA tissue IHC; standard IHC practice). For each comparable region, report the percentage of positive nuclei and, if intensity is reproducible, an H-score from nuclear intensity categories; use positive-cell density per mm² when cell abundance itself is the question (standard IHC practice). Normalise positive counts to the number of eligible cells, or density to measured viable tissue area, while excluding folds, edges and necrosis by a prespecified rule (standard IHC practice). Keep retrieval, detection, counterstaining and image thresholds consistent across sections so processing variation is not mistaken for biological change (standard IHC practice).
How do I distinguish genuine CREM staining from artefact?
Give greatest weight to clean nuclear staining in the expected cell population: HPA reports nuclear CREM in spermatocytes and spermatids and high staining in round or early spermatids (HPA tissue IHC). Treat signal confined to unexpected cells or exclusively to the cytoplasm as unresolved until controls support it; the protein is also annotated in cytoplasm, so compartment alone is not a definitive exclusion rule (UniProt Q03060 subcellular; standard IHC practice). Inspect section edges and necrotic regions for staining patterns unrelated to intact cells, and compare them with a no-primary control for endogenous enzyme or detection background (standard IHC practice). The selected caption reports peptide-preabsorbed negative-control staining, which supports that image’s specificity assessment but does not validate every specimen or staining pattern (A04379-1 tissue-IHC caption; standard IHC practice).
Boster reagents
Best CREM / cAMP-responsive element modulator IHC Antibodies
Two anti-CREM antibodies have IHC images from paraffin-embedded human brain and liver carcinoma (A04379-1 and A04379 image captions); both list human, mouse and rat reactivity, and A04379-1 lists IF (catalog applications and reactivity).
Real IHC data
Anti-CREM Antibody
Cat # A04379-1
Real IHC data
Anti-CREM (I106) Antibody
Cat # A04379
A04379 will render with IHC of paraffin-embedded human liver carcinoma at 1:100 (A04379 image caption). A04379-1 will render with IHC of paraffin-embedded human brain at 1:100 after Tris-EDTA pH 8.0 retrieval (A04379-1 image caption); IF is also listed for this SKU (catalog applications).
Which to pick: For tissue IHC, choose A04379 for the shown paraffin-embedded human liver carcinoma sample (A04379 image caption), or A04379-1 for the shown paraffin-embedded human brain sample (A04379-1 image caption); neither caption reports the fixative (image captions). For IF/ICC planning, A04379-1 is the relevant starting point because it lists IF at 1:50 (catalog applications and IF dilution); ICC testing and an IF image are unreported (catalog applications and image captions). For mouse or rat tissue, either SKU lists reactivity with those species (catalog reactivity), though both IHC images show human samples (image captions); both antibodies have a rabbit host, and clone status is unreported (catalog host and clone).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q03060 (CREM_HUMAN, cAMP-responsive element modulator).
- Human Protein Atlas. CREM tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. CREM subcellular location (ICC-IF): Mainly localized to the nucleoplasm. In addition localized to vesicles..
- Human Protein Atlas. CREM antibody validation summary (2 antibodies).
- Expression of Transcription Factor CREM in Human Tissues. The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society 2021 — PMC8329441.
- In vitro differentiation of rat spermatogonia into round spermatids in tissue culture. Molecular human reproduction 2016 — PMC5013872.
- Complete spermatogenesis in intratesticular testis tissue xenotransplants from immature non-human primate. Human reproduction (Oxford, England) 2019 — PMC6389866.
- Family members CREB and CREM control thyrotropin-releasing hormone (TRH) expression in the hypothalamus. Molecular and cellular endocrinology 2013 — PMC3572472.
- PubMed PMID:7916662 — UniProt-cited evidence.
- PubMed PMID:8206879 — UniProt-cited evidence.
- PubMed PMID:8622971 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for CREM (cAMP-responsive element modulator). Expected localisation Nuclear in spermatocytes and spermatids (HPA tissue IHC). Antigen retrieval: Tris-EDTA pH 8.0 HIER, heat-mediated (datasheet A04379-1). Validated IHC antibody: A04379-1 at 1:100-1:300 (the product's own IHC validation image is shown). Controls (HPA): positive Testis (Round or early spermatids); negative Adipose tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded Human brain tissue; fixative not specified (datasheet A04379-1); 2. Fixation: Image fixative and duration unreported (datasheet A04379-1); 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: Tris-EDTA pH 8.0 (datasheet A04379-1); 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-CREM, 1:100-1:300 (datasheet A04379-1); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across paraffin sections (standard IHC practice; not target-specific); Caveat: Isoform variation may affect antibody recognition (UniProt); Isoform / epitope: 29 isoforms; check epitope coverage (UniProt); Regulation: High in round or early spermatids (HPA tissue IHC). Evidence: UniProt Q03060, HPA tissue IHC · Enhanced, HPA ICC-IF · Mainly localized to the nucleoplasm. In addition localized to…, Datasheet A04379-1, PMC8329441, PMC5013872. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/CREM/immunohistochemistry-ihc-guide.