COPS7B / COP9 signalosome complex subunit 7b · IHC design guide

Design Immunohistochemistry for COPS7B

Plan COPS7B paraffin IHC using the catalog antibody’s documented formaldehyde-fixed tissue staining (datasheet M12717). Compare cytoplasmic and nuclear staining with the tissue profile, whose reliability is uncertain (HPA tissue IHC).

Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use

Immunohistochemistry protocol sheet for COPS7B (IHC for COPS7B): expected localisation Cytoplasmic and nuclear staining in most tissues (HPA tissue IHC), antibody M12717, validated IHC image, and IHC protocol steps — Printable **COPS7B** IHC protocol sheet — expected localisation Cytoplasmic and nuclear staining in most tissues (HPA tissue IHC), antibody M12717, controls and protocol steps. Open the full COPS7B IHC guide →

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COPS7B 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 and nuclear staining in most tissues (HPA tissue IHC)
	Staining pattern	Diverse cell types show cytoplasmic and nuclear staining (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet M12717)
	Positive control ⓘ	Adrenal gland+4 more · see all
	Negative control ⓘ	None in HPA (detected in all 45 tissues); use no-primary + isotype controls

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Formaldehyde-fixed paraffin sections were used (selected-SKU IHC image M12717)
	Caveat	Tissue staining reliability is uncertain; verification pending (HPA tissue IHC)
	Regulation	Expression regulation unannotated (UniProt)
	Isoform / epitope	3 isoforms; N-terminal epitope coverage is unknown (UniProt; datasheet M12717)

Section 1

Recommended COPS7B IHC & IF Protocols

Compare the catalog antibody’s citrate pH 6 IHC-P protocol (datasheet: M12717) with the published human glioma tissue microarray protocol (PMC13467472).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Formaldehyde-fixed, paraffin-embedded human kidney tissue (datasheet M12717)
Fixation	Image formalin-fixed; duration unreported (datasheet M12717); verify before use.
Sectioning	4–5 µm sections on charged slides (standard)
Deparaffinisation	Xylene, graded ethanol series to water (standard)
Antigen retrieval	Heat retrieval: Citrate pH 6 (datasheet M12717); 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-COPS7B, 1:25 (datasheet M12717)
Primary incubation	1 hours at 37°C (datasheet M12717)
Detection	HRP-polymer secondary, DAB chromogen 5–10 min (standard)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	COPS7B-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic and nuclear expression in most tissues. No signal in the no-primary control.

💡Decision noteStart with citrate pH 6 heat retrieval for the catalog antibody (datasheet: M12717); the glioma study used lactate pH 6 (PMC13467472).

Section 2

What Is the Expected COPS7B Staining Pattern?

COPS7B is reported in the cytoplasm and nucleus, with no transmembrane segment (UniProt Q9H9Q2). In tissue sections, expect staining in many cell populations; HPA reports high staining in selected glandular, respiratory epithelial, hematopoietic, endothelial and neuropil compartments (HPA: tissue IHC). Treat this as a provisional pattern because HPA rates its tissue IHC reliability Uncertain, pending external verification (HPA: tissue IHC).

What am I looking at on my slide?
Nuclear and cytoplasmic staining appears in glandular cells of adrenal gland, appendix, breast or duodenum (HPA: tissue IHC).	This fits HPA’s broad tissue profile and its High staining calls for those cells (HPA: tissue IHC). Score the compartments and cells separately; HPA’s overall tissue IHC reliability remains Uncertain (HPA: tissue IHC).
The dominant signal outlines cell membranes or collects outside cells, with little intracellular staining.	That distribution conflicts with the reported cytoplasmic and nuclear locations and the absence of a transmembrane segment (UniProt Q9H9Q2). Check whether staining follows tissue edges, deposits or detection background before assigning it to COPS7B (general IHC practice).
A cell population expected to stain weakly dominates the section, while expected positive cells do not; for example, oral squamous epithelium exceeds adjacent expected positives (HPA: oral mucosa low; tissue IHC).	Investigate antibody cross-reactivity or endogenous detection activity (general IHC practice). HPA calls oral squamous epithelial staining Low, but supplies no validated negative tissue, so this comparison is a warning rather than proof of a false positive (HPA: tissue IHC).
Brown signal is diffuse across cells, connective tissue and empty spaces, obscuring cell boundaries.	An even haze cannot establish the reported nuclear and cytoplasmic distribution (UniProt Q9H9Q2). Compare a no-primary control and inspect washes, blocking and chromogen development to locate nonspecific or detection background (general IHC practice).
A section containing adrenal glandular cells or bone marrow hematopoietic cells has no convincing intracellular signal (HPA: High staining in these cells).	Check assay performance with a suitable positive control, retrieval and detection controls (general IHC practice). Absence alone does not establish absent COPS7B: HPA’s tissue IHC calls are Uncertain and pending external verification (HPA: tissue IHC).

💡Expected COPS7B appearanceCall a result provisionally positive when cellular nuclear and cytoplasmic staining is discernible in an HPA-reported High cell population, such as adrenal glandular cells; membrane outlines, extracellular deposits or uniform haze argue for artefact (HPA: tissue IHC; UniProt Q9H9Q2; general IHC practice).

How each factor affects the staining
Cell compartment	UniProt lists cytoplasm and nucleus (UniProt Q9H9Q2); HPA tissue IHC also reports both in most tissues (HPA: tissue IHC). Cytoplasmic signal alone is therefore not a wrong-compartment call, although its cellular pattern needs assessment.
Choice of comparison cells	HPA reports High staining in adrenal glandular, bronchial respiratory epithelial and bone marrow hematopoietic cells, and Low staining in oral squamous epithelium (HPA: tissue IHC). These are relative expectations, not a validated positive/negative control pair (HPA: tissue IHC reliability Uncertain).
IHC evidence strength	HPA rates tissue IHC Uncertain, pending external verification, and lists HPA034675 and HPA034676 as IHC Uncertain (HPA: tissue IHC; HPA: antibodies). Require a coherent cellular pattern and controls before interpreting intensity as target abundance (general IHC practice).
Protein forms and location	UniProt lists 3 isoforms, no transmembrane segment and no signal peptide or propeptide (UniProt Q9H9Q2). The supplied record does not map antibody epitopes to isoforms, so staining cannot identify an individual isoform.
IF/ICC comparison	HPA reports supported nucleoplasmic localisation in ICC-IF, with HPA034676 marked ICC Supported (HPA: subcellular; HPA: antibodies). This supports a nuclear comparison, while tissue IHC also reports cytoplasmic staining and retains Uncertain reliability (HPA: tissue IHC).

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Expected positive cells show no chromogenic signal.	The staining run may have failed, or the chosen section may differ from HPA’s reported pattern (general IHC practice; HPA: tissue IHC reliability Uncertain).	Review a same-run positive control, retrieval conditions and detection steps, then compare the actual cell population with an HPA High example (general IHC practice; HPA: tissue IHC).
Brown staining fills lumens or coats section edges.	Deposits or edge-related background can mimic positive staining (general IHC practice).	Inspect morphology and a no-primary control; score intracellular nuclear and cytoplasmic signal in intact cells (general IHC practice; UniProt Q9H9Q2).
Many cells show a uniform brown haze.	Nonspecific antibody or detection background may obscure cellular compartments (general IHC practice).	Check blocking, washes and chromogen development against a no-primary control, then reassess compartment-specific staining (general IHC practice).
Strong signal appears where HPA reports comparatively low staining.	Cross-reactivity or endogenous detection activity is possible; HPA has no listed negative tissue and rates tissue IHC Uncertain (general IHC practice; HPA: tissue IHC).	Check no-primary and detection controls and compare cells within the section; avoid declaring the population negative solely from HPA’s Low call (general IHC practice; HPA: oral mucosa).
Only nuclear staining is visible, or only cytoplasmic staining is visible.	UniProt and HPA tissue IHC report both locations, but the supplied evidence gives no required nuclear-to-cytoplasmic intensity ratio (UniProt Q9H9Q2; HPA: tissue IHC).	Record each compartment and compare a well-preserved positive cell population; do not force a fixed ratio when scoring (general IHC practice).
Q: Should IF/ICC show the same compartment pattern as tissue IHC?	HPA reports supported nucleoplasmic ICC-IF localisation, while its tissue IHC summary includes cytoplasmic and nuclear staining (HPA: subcellular; HPA: tissue IHC).	A: Use nucleoplasmic IF/ICC signal as a comparison, while assessing tissue IHC on its own cellular pattern and Uncertain reliability (HPA: subcellular; HPA: tissue IHC).

Source: UniProt Q9H9Q2 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing COPS7B staining

M12717 staining COPS7B in human kidney tissue sections by Immunohistochemistry (IHC-P -paraformaldehyde-fixed, paraffin-embedded sections). Tissue was fixed with formaldehyde and blocked with 3% BSA for 0. 5 hour at room temperature; antigen retrieval was by heat mediation with a citrate buffer (pH6). Samples were incubated with primary antibody (1/25) for 1 hours at 37°C. A undiluted biotinylated goat polyvalent antibody was used as the secondary antibody.

M12717 · IHCM12717 staining COPS7B in human kidney tissue sections by Immunohistochemistry (IHC-P -paraformaldehyde-fixed, paraffin-embedded sections).

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000144524-COPS7B/tissue/cerebral+cortex#imid_9220851

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000144524-COPS7B/tissue/colon#imid_9220767

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000144524-COPS7B/tissue/liver#imid_9220768

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000144524-COPS7B/tissue/kidney#imid_9220769

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA034676; green = COPS7B, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

Real IHC / IF data behind the staining-pattern expectations in this section.

Sample controls for COPS7B IHC & IF

🧪Start with bone marrow; hematopoietic cells should stain (HPA: High in bone-marrow hematopoietic cells). HPA detects COPS7B in all 45 scored tissues, so there is no supported negative tissue; use no-primary and isotype controls, while anucleate erythrocytes on the positive slide should lack nuclear staining but are not a validated COPS7B-negative population (HPA: no negative rows; UniProt: nucleus and cytoplasm; standard IHC morphology).

Positive control tissue: Adrenal gland (Glandular cells, HPA High)

Negative control tissue: None in HPA: COPS7B is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead.

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show COPS7B in A-431, U-251MG, U2OS, with annotated localisation: Nucleoplasm (supported) (HPA subcellular).

Technical controls: Run a no-primary, secondary-only control and an isotype control matched to the primary antibody’s host species and immunoglobulin class; include COPS7B knockout material if available as a biological negative (standard IHC practice). Quench endogenous peroxidase in bone marrow and compare any chromogenic signal with the secondary-only control (standard IHC practice).

⚠️Feasibility: A target-specific fixation window and retrieval dependency are unreported; the selected M12717 paraffin-section caption uses heat-mediated citrate retrieval at pH 6, and its supplied fixative field is unreported (caption: citrate retrieval; caption metadata: fixative not stated). The supplied evidence does not establish that frozen sections or IF/ICC are easier; IF/ICC can assess nucleoplasmic localization (HPA: nucleoplasm supported). Bone-marrow peroxidase activity can mimic chromogenic staining, so assess staining after peroxidase blocking against the controls (standard IHC practice).

HPA tissue IHC evidence for COPS7B

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Uncertain — 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
Adrenal gland	Glandular cells	High	Protein (IHC)	HPA →
Appendix	Glandular cells	High	Protein (IHC)	HPA →
Bone marrow	Hematopoietic cells	High	Protein (IHC)	HPA →
Breast	Glandular cells	High	Protein (IHC)	HPA →
Bronchus	Respiratory epithelial cells	High	Protein (IHC)	HPA →

Undetected expression · recommended negative controls

Tissue	Cell type	Level	Evidence	Source
None in HPA: COPS7B is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead.

Section 3

Advanced COPS7B IHC Tips

Troubleshoot COPS7B staining in paraffin sections by checking retrieval, cell compartment, background, and scoring against the available tissue evidence.

How should I retrieve COPS7B in paraffin sections when staining is weak?

Start with heat-mediated citrate retrieval at pH 6 for paraffin sections (datasheet M12717). The selected tissue image used this retrieval with M12717 in human kidney sections (caption M12717). If staining remains weak, optimize heating time and cooling consistently across a small section series; excessive heating can damage morphology (standard IHC practice). Keep primary incubation fixed while comparing retrieval conditions, so a signal change can be assigned to retrieval (standard IHC practice). Include a no-primary control and inspect nuclear and cytoplasmic staining, both reported for COPS7B in tissue (HPA tissue IHC: cytoplasmic and nuclear expression).

Could fixation explain weak or uneven COPS7B staining?

Target-specific fixation sensitivity for COPS7B is unknown from the evidence provided; do not assign weak staining to a particular fixative without a controlled comparison. Record the fixative, fixation duration, section thickness, and time before processing for every specimen (standard IHC practice). Compare sections processed together while keeping citrate retrieval at pH 6 and detection conditions constant (datasheet M12717; standard IHC practice). If morphology is damaged or staining varies across a section, examine processing consistency before changing antibody concentration (standard IHC practice). Use a matched, consistently processed reference section in each run to distinguish preparation variation from a biological difference (standard IHC practice).

Should COPS7B staining appear in nuclei, cytoplasm, or both?

Evaluate both nuclear and cytoplasmic compartments because COPS7B is annotated in each (UniProt Q9H9Q2: cytoplasm and nucleus). Tissue IHC likewise reports cytoplasmic and nuclear expression in most tissues, although its reliability is uncertain pending external verification (HPA tissue IHC). Score the compartments separately rather than pooling a strong nuclear signal with diffuse cytoplasmic color (standard IHC practice). Examine intact cells at comparable section depth and exposure to chromogen, since folds and section edges can distort apparent compartment boundaries (standard IHC practice). A pattern confined to extracellular material requires additional validation because the supplied localisation evidence is intracellular (UniProt Q9H9Q2; HPA tissue IHC).

Could isoforms or epitope accessibility change the IHC pattern?

COPS7B has 3 annotated isoforms and a PCI domain spanning residues 2–159 (UniProt Q9H9Q2). Check the antibody's disclosed immunogen or mapped epitope against those isoforms before interpreting discordant samples; epitope coverage for M12717 is not supplied here. Its annotated modifications include N-terminal acetylation and phosphorylation at residues 261 and 263 (UniProt Q9H9Q2). Such features identify regions to investigate, but the supplied evidence does not establish that they alter M12717 binding. Compare an independently validated antibody targeting another region on matched sections if an isoform-specific interpretation matters (standard IHC validation practice).

How can IF help resolve ambiguous chromogenic COPS7B staining?

Use IF as a complementary localisation check; the supported nucleoplasmic assignment comes from subcellular imaging, while tissue IHC reports nuclear and cytoplasmic expression (HPA subcellular; HPA tissue IHC). Multiplex COPS7B with a validated marker for the expected cell population, such as glandular cells in adrenal gland, and assess overlap cell by cell (HPA tissue IHC: high in adrenal gland glandular cells; standard IF practice). Choose a far-red fluorophore when tissue autofluorescence obscures shorter wavelengths, with single-stain controls to assess bleed-through (standard IF practice). COPS7B has no transmembrane segment and is intracellular, so use controlled permeabilisation when probing its nuclear or cytoplasmic epitopes (UniProt Q9H9Q2; standard IF practice).

How do I distinguish COPS7B signal from chromogenic background?

Run a no-primary control through the same secondary and chromogen steps to reveal detection-system background (standard IHC practice). For peroxidase detection, include an endogenous peroxidase block and compare its effect on cellular and noncellular color (standard IHC practice). The M12717 kidney image used 3% BSA blocking for 0.5 hour and a biotinylated secondary antibody (caption M12717). If background persists, test blocking and secondary conditions on matched sections, including a control for endogenous biotin when using biotin-based detection (standard IHC practice). Compare suspected signal with intact-cell nuclear or cytoplasmic staining rather than pigment, folds, or necrotic debris (UniProt Q9H9Q2: nucleus and cytoplasm; standard IHC practice).

What is a defensible way to score COPS7B IHC across samples? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and region of interest before scoring, and exclude folds, necrosis, and section edges consistently (standard IHC practice). Record nuclear and cytoplasmic staining separately because both locations are reported for COPS7B (UniProt Q9H9Q2; HPA tissue IHC). For intact target cells, report percentage positive and an intensity-weighted H-score where staining grades are reproducible; for sparse populations, report positive-cell density per mm² (standard IHC practice). Normalize counts to the number of evaluable target cells or measured viable tissue area, and keep that denominator consistent across specimens (standard IHC practice). State the positivity threshold and use matched controls because the tissue IHC reliability is uncertain (HPA tissue IHC: Uncertain; standard IHC practice).

When should an apparent COPS7B-positive area be treated as artefact?

Favor staining within intact nuclei or cytoplasm, the reported COPS7B compartments, over color restricted to extracellular deposits (UniProt Q9H9Q2; HPA tissue IHC). Check whether the signal occurs in the intended cell population; HPA reports high staining in several cell types, including adrenal glandular cells and bone marrow hematopoietic cells (HPA tissue IHC). Treat edge-only staining, necrotic regions, and color reproduced in the no-primary control as suspect (standard IHC practice). For peroxidase chromogens, assess endogenous enzyme activity with an appropriate block and control section (standard IHC practice). Interpret unexpected cell-specific absence cautiously because HPA tissue IHC is rated Uncertain and pending external verification (HPA tissue IHC).

Boster reagents

Best COPS7B / COP9 signalosome complex subunit 7b IHC Antibodies

M12717 is a human-reactive anti-COPS7B antibody with IHC data from human kidney paraffin sections (catalog: M12717 reactivity; M12717 IHC image caption).

Real IHC data

Anti-COPS7B Antibody (N-Term)

Cat # M12717

View product →

M12717 lists IHC-P and human reactivity (catalog: M12717 applications and reactivity). Its IHC image shows staining in human kidney paraffin sections; no IF image is supplied (M12717 IHC and IF image captions).

Which to pick: For tissue IHC, choose M12717, a rabbit polyclonal antibody with human reactivity and IHC-P listed at 1:25; its own image caption documents human kidney paraffin sections (catalog: M12717 host, dilution and applications; M12717 IHC image caption). No IF/ICC choice is supported by this catalog: M12717 does not list IF/ICC or provide an IF image (catalog: M12717 applications and IF image captions). No cross-species choice is supported because M12717 lists human reactivity only (catalog: M12717 reactivity).

Each figure is that product's own IHC / IF validation image from its datasheet.

References

UniProt Consortium. UniProt entry Q9H9Q2 (CSN7B_HUMAN, COP9 signalosome complex subunit 7b).
Human Protein Atlas. COPS7B tissue IHC expression (reliability: Uncertain).
Human Protein Atlas. COPS7B subcellular location (ICC-IF): Localized to the nucleoplasm..
Human Protein Atlas. COPS7B antibody validation summary (2 antibodies).
COPS7B Drives Malignant Progression of Glioblastoma Through Translational Upregulation of the Downstream Functional Effector CLU. International journal of molecular sciences 2026 — PMC13467472.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:15815621 — UniProt-cited evidence.
PubMed PMID:15489334 — UniProt-cited evidence.