This website uses cookies to ensure you get the best experience on our website.
- Table of Contents
CREM / cAMP-responsive element modulator · IHC design guide
Design Immunohistochemistry for CREM
Plan CREM IHC in paraffin sections using the nuclear staining seen in spermatocytes and spermatids as a reference (HPA tissue IHC). Compare staining with high expression in round or early spermatids (HPA tissue IHC), and consider the 29 annotated isoforms when interpreting results (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 sections. (standard IHC practice; not target-specific) | |
| Caveat | Splice variants may affect antibody epitope coverage (UniProt) | |
| Regulation | Testis-enhanced expression (HPA tissue RNA) | |
| Isoform / epitope | 29 isoforms; verify epitope coverage (UniProt) |
Section 1
Recommended CREM IHC & IF Protocols
The catalog antibody’s IHC-P protocol is accompanied by four published CREM immunohistochemistry 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 noteFor the catalog antibody, start with heat-mediated Tris-EDTA at pH 8.0 (datasheet: A04379-1). The published protocols used other retrieval conditions where stated (PMC8329441; PMC5013872; PMC6389866).
Section 2
What Is the Expected CREM Staining Pattern?
CREM is a nuclear and cytoplasmic protein with no transmembrane segment (UniProt Q03060: location and topology). In tissue IHC, the clearest expected pattern is nuclear staining in spermatocytes and spermatids, especially strong staining in round or early spermatids (HPA tissue IHC: Enhanced; round or early spermatids High). HPA reports high consistency between antibody staining and RNA expression (HPA tissue IHC: reliability description).
| Strong, distinct nuclei in round or early spermatids, with staining in spermatocytes. | This matches the principal tissue pattern (HPA tissue IHC: nuclear expression in spermatocytes and spermatids; round or early spermatids High). Judge the signal within the identified cells, since testis contains several cell populations (general IHC practice). |
| Predominantly cytoplasmic staining replaces the expected nuclear pattern in testis. | Review localisation before calling it a positive result: the tissue IHC profile is nuclear (HPA tissue IHC: profile). UniProt also lists cytoplasm, and HPA reports low cytoplasmic or membrane staining in Purkinje cells, so cytoplasmic signal alone is not proof of artefact (UniProt Q03060: location; HPA tissue IHC: Cerebellum Low). |
| Strong staining appears in an unexpected cell population or a listed negative population. | Check cell identification and controls; cross-reactivity or endogenous detection activity are possible technical causes (general IHC practice). HPA reports no detection in adipocytes, cervical glandular cells and lymph-node germinal-center cells, among other listed populations (HPA tissue IHC: Not detected). |
| Broad, diffuse colour obscures cell boundaries and nuclear detail. | Treat the pattern as difficult to score rather than assigning it to CREM. Non-specific antibody binding or detection background can obscure compartment-level interpretation (general IHC practice); the reported testis pattern is nuclear (HPA tissue IHC: profile). |
| No interpretable staining appears in round or early spermatids. | This conflicts with their reported High staining (HPA tissue IHC: Testis). Check that the section contains the expected cells, then review the antibody and detection controls (general IHC practice). A negative run alone cannot establish absence of CREM. |
💡Expected CREM appearancePositive call: distinct nuclear staining in spermatocytes, with High staining in round or early spermatids (HPA tissue IHC: profile; Testis High). Diffuse colour or strong staining in an unexpected population warrants control review before a positive call (general IHC practice).
| Tissue and cell context | Testis provides the clearest reported positive pattern (HPA tissue IHC: round or early spermatids High). HPA also lists Medium staining in appendix, colon and duodenal goblet cells, several glandular populations, and kidney proximal-tubule cell bodies (HPA tissue IHC: Medium); those entries do not specify an equally strong nuclear pattern. |
| Antibody validation | Both listed rabbit polyclonal antibodies have Enhanced IHC status (HPA antibodies: HPA001818 and CAB018352). The tissue profile's Enhanced reliability reflects consistency with RNA expression (HPA tissue IHC: reliability description); check the validation attached to the antibody actually used. |
| Isoforms and epitope coverage | UniProt lists 29 CREM isoforms and places KID at residues 88–147 and bZIP at 286–345 (UniProt Q03060: isoforms and domains). The payload gives no antibody epitope, so isoform coverage and any effect of antigen retrieval cannot be predicted from these domain positions. |
| Processing and compartment | UniProt lists one chain spanning residues 1–345, no signal peptide or propeptide, and no transmembrane segment (UniProt Q03060: processing and topology). Interpret the nuclear tissue pattern on its own evidence; these features do not establish how fixation or retrieval affects staining. |
| IF/ICC Q: Where should CREM appear? | A: HPA reports mainly nucleoplasmic signal and additional vesicular signal in ICC-IF (HPA subcellular: Nucleoplasm supported; Vesicles approved). These cell-image observations give localisation context; they are not an IHC-P protocol or a substitute for the tissue IHC pattern. |
| Situation | Likely cause | Next action |
|---|---|---|
| Testis section has no visible positive nuclei. | The expected cell population may be absent from the field, or the staining run may have failed (HPA tissue IHC: round or early spermatids High; general IHC practice). | Confirm round or early spermatids in the section; compare a known-positive testis section and the run controls before changing conditions (general IHC practice). |
| Signal is faint in the expected testis cells. | Weak overall detection or an unsuitable antibody condition is possible (general IHC practice); the expected level is High in round or early spermatids (HPA tissue IHC: Testis). | Inspect positive controls and the catalog antibody's IHC-P instructions; optimise the stated retrieval or antibody condition within that validated workflow (general IHC practice). No target-specific retrieval requirement is supplied. |
| Colour is widespread and nuclei cannot be resolved. | Non-specific binding or detection background may be obscuring the reported nuclear pattern (general IHC practice; HPA tissue IHC: profile). | Check omission or reagent controls, blocking and wash conditions, then reassess nuclear detail alongside the counterstain (general IHC practice). |
| Strong staining appears in a listed Not detected population. | Cell misidentification, cross-reactivity or endogenous detection activity is possible (general IHC practice); the listed HPA result is population-specific (HPA tissue IHC: Not detected). | Verify the cell type and compare the positive tissue and detection controls. If relevant to the detection system, check endogenous activity with an appropriate control (general IHC practice). |
| Cytoplasmic colour dominates a testis result. | It may obscure the reported nuclear testis pattern (HPA tissue IHC: profile). Cytoplasmic localisation is also listed by UniProt, so compartment alone does not identify the cause (UniProt Q03060: location). | Score nuclei separately from cytoplasm, inspect background controls and compare the expected spermatid population (general IHC practice; HPA tissue IHC: Testis High). |
| A negative result is being inferred from another tissue's faint staining. | HPA reports different levels by cell population, including Medium, Low and Not detected entries (HPA tissue IHC: tissue levels). | Record the exact population and intensity, then compare with its HPA entry and an on-run positive control; avoid using testis intensity as a threshold for every tissue (general IHC practice; HPA tissue IHC: tissue levels). |
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 and expect CREM staining in round or early spermatids (HPA: High); use adipose tissue adipocytes as the negative comparator (HPA: Not detected). Other cells on the testis slide can serve as internal background references when they show only counterstain and no specific chromogen signal (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 a no-primary, secondary-only control and, for a monoclonal primary, a host- and subclass-matched isotype control; for a polyclonal primary, use matched nonimmune host IgG (standard IHC practice). Add a peptide-blocked primary as a biological specificity control (selected-SKU tissue-IHC caption: peptide pre-absorption), and block endogenous peroxidase before chromogenic detection (standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported in the supplied evidence; the selected-SKU paraffin-section caption does not state a fixative (selected-SKU tissue-IHC caption). The reported paraffin IHC used high-pressure, high-temperature Tris-EDTA retrieval at pH 8.0, but retrieval dependence has not been established (selected-SKU tissue-IHC caption). There is no matched evidence that frozen-section IHC or IF is easier; in testis, judge signal in round or early spermatids against local background and 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, antibody specificity and cell level controls before interpreting chromogenic signal.
What retrieval should I try first for weak CREM staining in paraffin sections?
Start with heat mediated Tris-EDTA retrieval at pH 8.0 for paraffin section IHC (datasheet A04379-1). The selected brain image used high pressure and temperature retrieval, then the catalog antibody at 1:100 overnight at 4 °C (caption A04379-1). If nuclear staining remains weak, compare shorter and longer retrieval cycles on matched sections while holding antibody incubation and chromogen development constant (standard IHC practice). Judge improvement in defined cell populations: CREM is mainly nucleoplasmic, and HPA reports nuclear expression in spermatocytes and spermatids (HPA subcellular; HPA tissue IHC).
How should I investigate variable CREM staining across paraffin blocks?
CREM specific fixation sensitivity is unknown from the supplied evidence; the selected paraffin brain caption does not state its fixative (caption A04379-1). Record each block’s fixative, time to fixation and fixation duration, then compare material processed consistently before attributing weak nuclei to biology (standard IHC practice). For an optimization series, change one processing variable at a time and keep Tris-EDTA retrieval at pH 8.0 constant (datasheet A04379-1; standard IHC practice). Include testis containing round or early spermatids as a biological staining reference, without inferring fixation tolerance from its reported expression (HPA tissue IHC).
Should CREM stain nuclei, cytoplasm, or both in chromogenic IHC?
Prioritize nuclear staining when assessing CREM in relevant cells: HPA describes nuclear expression in spermatocytes and spermatids and supported nucleoplasmic localization (HPA tissue IHC; HPA subcellular). Cytoplasmic signal is biologically possible because UniProt lists both nucleus and cytoplasm, while HPA also records vesicles (UniProt Q03060 subcellular; HPA subcellular). Compare nuclear and cytoplasmic compartments separately against adjacent cells and a no primary control, using the same pH 8.0 retrieval across sections (datasheet A04379-1; standard IHC practice). Diffuse cytoplasmic chromogen alone is insufficient to establish specific CREM staining; assess its cell distribution and control behavior (standard IHC practice).
Can this IHC result identify a particular CREM isoform or phosphorylation state?
CREM has 29 listed isoforms, and its isoforms can function as transcriptional activators or repressors (UniProt Q03060 isoforms; UniProt Q03060 function). Its KID spans residues 88–147, its bZIP spans 286–345, and listed phosphoserines include residues 102 and 129 (UniProt Q03060 domains; UniProt Q03060 modified residues). The supplied caption does not map the catalog antibody’s epitope or establish isoform or phosphorylation selectivity (caption A04379-1). Treat chromogenic staining as antibody reactive CREM signal, and require mapped epitope information or independent isoform specific evidence before making a narrower claim (standard IHC interpretation).
How would I assess CREM in a separate IF multiplex experiment?
For a separate IF assay, pair CREM with a validated marker for the expected spermatocyte or spermatid population, where HPA reports nuclear expression (HPA tissue IHC; standard IF practice). Assign CREM a fluorophore in a channel with low specimen autofluorescence, often a far red channel, and check single stain and no primary controls before interpreting overlap (standard IF practice). CREM has no transmembrane segment and is mainly nucleoplasmic, so permeabilisation should permit access to an intracellular, potentially nuclear epitope; the catalog antibody’s epitope is unspecified (UniProt Q03060 topology; HPA subcellular; caption A04379-1). Optimize IF fixation and detergent conditions within that assay because the paraffin IHC caption supplies no IF fixation evidence (caption A04379-1; standard IF practice).
How can I separate CREM chromogen from nonspecific background?
Inspect a no primary section for endogenous enzyme activity and a matched section for staining outside the expected cells or compartments (standard chromogenic IHC practice; HPA tissue IHC). Apply a peroxidase block before HRP detection, then use controlled DAB development and a consistent counterstain; these are general workflow steps, not CREM specific validation (standard chromogenic IHC practice). The selected 1:100 brain image included a peptide preabsorption negative control, which tests antibody dependent signal in that image but does not establish specificity in every tissue (caption A04379-1). If background persists, titrate the primary and detection reagents on matched sections while retaining the same pH 8.0 retrieval (datasheet A04379-1; standard IHC practice).
What should I score when comparing CREM IHC between specimens? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and nuclear compartment before scoring; HPA reports strong staining in round or early spermatids and nuclear expression in spermatocytes and spermatids (HPA tissue IHC). Report the percentage of positive nuclei and intensity grades 0–3, or calculate a nuclear H-score on a 0–300 scale (standard IHC scoring practice). Normalize positive counts to all evaluable nuclei of the same defined cell population, and report excluded damaged or missing regions (standard IHC scoring practice). Keep retrieval at pH 8.0, antibody incubation and chromogen development consistent across compared sections, since processing changes can alter measured intensity (datasheet A04379-1; standard IHC practice).
Which CREM staining patterns are convincing, and which suggest artefact?
Convincing staining follows an interpretable cell distribution and includes nuclei in spermatocytes or round spermatids, where HPA reports CREM expression (HPA tissue IHC). Evaluate unexpected cytoplasmic staining cautiously because UniProt lists cytoplasm and HPA lists vesicles in addition to supported nucleoplasm (UniProt Q03060 subcellular; HPA subcellular). Signal restricted to section edges, necrotic areas or the no primary control suggests a processing or detection artefact; check endogenous peroxidase before calling DAB positive (standard chromogenic IHC practice). The selected paraffin brain image used antibody preabsorption as a negative control, but that result alone cannot identify the stained isoform among CREM’s 29 listed forms (caption A04379-1; UniProt Q03060 isoforms).
Boster reagents
Best CREM / cAMP-responsive element modulator IHC Antibodies
Both anti-CREM antibodies have IHC images from paraffin sections of human tissue (catalog IHC captions) and list human, mouse, and rat reactivity (catalog reactivity).
Real IHC data
Anti-CREM Antibody
Cat # A04379-1
Real IHC data
Anti-CREM (I106) Antibody
Cat # A04379
A04379-1 has an IHC image from paraffin-embedded human brain at 1:100 (A04379-1 IHC image caption) and lists IHC and IF applications (A04379-1 catalog applications). A04379 has an IHC image from paraffin-embedded human liver carcinoma at 1:100 (A04379 IHC image caption) and lists IHC only (A04379 catalog applications).
Which to pick: For tissue IHC, choose A04379-1 for its human brain example or A04379 for its human liver carcinoma example; both captions describe paraffin sections but leave the fixative unreported (respective IHC image captions). For IF, choose A04379-1, which lists IF at 1:50; ICC is not listed, and no IF image is supplied (A04379-1 catalog applications, dilution, and image alts). Both list human, mouse, and rat reactivity, so species alone does not distinguish them (catalog reactivity).
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 sections. (standard IHC practice; not target-specific); Caveat: Splice variants may affect antibody epitope coverage (UniProt); Isoform / epitope: 29 isoforms; verify epitope coverage (UniProt); Regulation: Testis-enhanced expression (HPA tissue RNA). 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.