CCT5 / T-complex protein 1 subunit epsilon · IHC design guide

Design Immunohistochemistry for CCT5

Plan CCT5 chromogenic IHC around cytoplasmic staining, most abundant in seminiferous duct cells (HPA tissue IHC). This guide covers paraffin-section staining with the catalog antibody (datasheet PB9928) and interpretation of CNS nuclear positivity, which HPA disregards as off target (HPA tissue IHC).

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

Immunohistochemistry protocol sheet for CCT5 (IHC for CCT5): expected localisation General cytoplasmic staining (HPA tissue IHC), antibody PB9928, validated IHC image, and IHC protocol steps — Printable **CCT5** IHC protocol sheet — expected localisation General cytoplasmic staining (HPA tissue IHC), antibody PB9928, controls and protocol steps. Open the full CCT5 IHC guide →

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CCT5 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	General cytoplasmic staining (HPA tissue IHC)
	Staining pattern	Cytoplasmic staining, most abundant in seminiferous duct cells (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet PB9928)
	Positive control ⓘ	Caudate+4 more · see all
	Negative control ⓘ	Esophagus+4 more · see all

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Keep paraffin-section fixation consistent (standard IHC practice; not target-specific); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image PB9928)
	Caveat	CNS nuclear positivity may be off target (HPA tissue IHC)
	Regulation	No regulation annotated (UniProt)
	Isoform / epitope	2 isoforms; epitope impact unresolved (UniProt)

Section 1

Recommended CCT5 IHC & IF Protocols

The catalog antibody’s IHC-P protocol is accompanied by four published CCT5 IHC protocols (PMC5609992; PMC11409311; PMC13014677; PMC13260463).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded human intestinal cancer tissues; fixative not specified (datasheet PB9928)
Fixation	Image fixative and duration unreported (datasheet PB9928); 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, 20 min (datasheet PB9928)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet PB9928)
Primary antibody	Rabbit anti-CCT5, 0.5-1μg/ml (datasheet PB9928)
Primary incubation	Overnight at 4 °C (datasheet PB9928)
Detection	Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB9928)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	CCT5-positive staining in glial cells of caudate (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression, most abundant in seminiferous duct cells. No signal in the no-primary control.

💡Decision noteStart with heat-mediated citrate pH 6 retrieval (datasheet: PB9928); a published colon cancer protocol also used microwave citrate pH 6.0 (PMC13260463: methods).

Section 2

What Is the Expected CCT5 Staining Pattern?

CCT5 is expected mainly in the cytoplasm, consistent with its UniProt location and lack of a transmembrane segment (UniProt P48643: subcellular location, topology). HPA reports general cytoplasmic IHC expression, most abundant in seminiferous duct cells, with high staining in late spermatids and several other cell populations (HPA tissue IHC: Enhanced). Interpret CNS nuclear positivity cautiously: HPA regards it as off target (HPA tissue IHC: reliability description).

What am I looking at on my slide?
Cytoplasmic staining in late spermatids, placental cytotrophoblasts, or lymph node germinal center cells.	This fits the reported high staining in those cell populations (HPA tissue IHC: High). Score the named cells and cytoplasmic compartment together; staining elsewhere in the section does not by itself establish a CCT5-positive result (HPA tissue IHC; general IHC interpretation).
Predominantly nuclear staining, especially in CNS cells.	This conflicts with the expected cytoplasmic location (UniProt P48643: subcellular location; HPA tissue IHC: profile). HPA specifically disregards CNS nuclear positivity as off target, so exclude it from CCT5 scoring even if the nuclear signal is strong (HPA tissue IHC: reliability description).
Strong staining in cells reported as not detected, such as cardiomyocytes or esophageal squamous cells.	The cell-level pattern disagrees with HPA tissue IHC (HPA tissue IHC: Not detected). Consider cross-reactivity or endogenous detection activity, then compare a known-positive cell population and appropriate detection controls before attributing the signal to CCT5 (general IHC interpretation).
Diffuse chromogen across cells, stroma, or much of the section without clear cytoplasmic boundaries.	A widespread haze is difficult to reconcile with a cell-resolved cytoplasmic pattern (HPA tissue IHC: profile). Background from detection or blocking is a possible explanation; interpret intensity only after a control section shows that the haze is separate from specific staining (general IHC practice).
No cytoplasmic signal in a known-positive population, such as testis late spermatids.	An absent signal disagrees with the reported high staining in that population (HPA tissue IHC: Testis, High). First check that the relevant cells are present and identifiable; then check the antibody, retrieval, detection, and control performance without assuming that CCT5 is absent (general IHC practice).

💡Expected CCT5 appearanceCall an IHC result positive when discrete cytoplasmic staining is visible in an HPA high population, particularly late spermatids, with intensity judged against local background (HPA tissue IHC: High; UniProt P48643: cytoplasm); prominent CNS nuclear staining is a false-positive pattern for CCT5 scoring (HPA tissue IHC: reliability description).

How each factor affects the staining
Cell population and compartment	HPA reports broad cytoplasmic expression but different cell-level intensities: late spermatids and placental cytotrophoblasts are High, whereas cardiomyocytes are Not detected (HPA tissue IHC). Select and score the named cells rather than treating an entire organ as uniformly positive or negative.
Antibody validation	HPA labels the tissue IHC profile Enhanced and records Enhanced IHC validation for HPA002238 and HPA005958; CAB006271 is Supported (HPA antibodies; HPA tissue IHC). These labels support the reported pattern but do not validate every antibody or every staining condition.
Isoforms and epitope	UniProt lists two CCT5 isoforms and a chain spanning residues 2–541, with no signal peptide or propeptide (UniProt P48643: isoforms, processing). The supplied evidence gives no antibody epitope, so isoform recognition and epitope-dependent staining cannot be predicted from this record.
IF/ICC Q: What localization is reported?	In sperm ICC-IF, HPA approves the mid piece as the main location and the principal piece and annulus as additional locations (HPA subcellular: sperm). This sperm-specific IF observation does not replace the cytoplasmic tissue IHC pattern or establish an IF protocol for paraffin sections.
Fixation sensitivity	Target-specific sensitivity to fixation or antigen retrieval is unreported in the supplied UniProt and HPA evidence. Retrieval may be optimized as a general IHC workflow step, but no CCT5-specific retrieval condition or fixation effect can be inferred (general IHC practice).

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Known-positive cells are present, but chromogenic signal is absent.	The assay may have failed to reveal antigen; the supplied evidence does not identify a CCT5-specific fixation or retrieval failure.	Confirm cell identity in a high-staining population such as late spermatids (HPA tissue IHC: Testis, High). Check the IHC-validated antibody, retrieval and detection steps against assay controls; adjust one general workflow variable at a time (general IHC practice).
CNS nuclei stain more strongly than cytoplasm.	HPA identifies CNS nuclear positivity as off target (HPA tissue IHC: reliability description).	Do not score those nuclei as CCT5. Reassess cytoplasmic staining in an HPA positive population, and compare antibody and detection controls before accepting any CNS result (HPA tissue IHC; general IHC practice).
Cardiomyocytes or esophageal squamous cells show convincing signal.	These cells are reported as Not detected (HPA tissue IHC); cross-reactivity or endogenous detection activity is possible (general IHC interpretation).	Compare cell-specific staining with a known-positive section and run appropriate reagent controls. Review whether the signal follows cell boundaries and the expected cytoplasmic compartment (UniProt P48643: cytoplasm; general IHC practice).
Stain covers the section as a diffuse haze.	Excess nonspecific binding or detection background can obscure a discrete cellular pattern (general IHC practice).	Inspect controls, blocking and wash steps, then reassess antibody and detection reagent concentrations within the assay workflow (general IHC practice). Accept a pattern only when named cells can be distinguished from local background (HPA tissue IHC).
Signal appears restricted to membranes or extracellular material.	That distribution conflicts with CCT5's reported cytoplasmic location and lack of a transmembrane segment (UniProt P48643: subcellular location, topology).	Treat the distribution as suspect; check morphology and detection controls, then compare the same run with an HPA high cell population for intracellular staining (HPA tissue IHC; general IHC practice).
A weakly stained section seems to contradict a negative call.	HPA reports general cytoplasmic expression alongside cell populations scored Low or Not detected; organ-wide judgments can obscure those distinctions (HPA tissue IHC).	Record the exact cell population, compartment and intensity. Compare like cells with HPA's cell-level categories and keep weak background separate from interpretable cytoplasmic staining (HPA tissue IHC; general IHC interpretation).

Source: UniProt P48643 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing CCT5 staining

IHC analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in paraffin-embedded section of human intestinal cancer tissues. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-CCT5 Antibody (PB9928) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

PB9928 · IHCIHC analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in paraffin-embedded section of human intestinal cancer tissues. H

IHC analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in paraffin-embedded section of mouse ovary tissues. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-CCT5 Antibody (PB9928) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

PB9928 · IHCIHC analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in paraffin-embedded section of mouse ovary tissues. Heat mediated

IF analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in immunocytochemical section of U20S cell. Enzyme antigen retrieval was performed using IHC enzyme antigen retrieval reagent (AR0022) for 15 mins. The cells were blocked with 10% goat serum. And then incubated with 2μg/mL rabbit anti-CCT5 Antibody (PB9928) overnight at 4°C. DyLight®488 Conjugated Goat Anti-Rabbit IgG (BA1127) was used as secondary antibody at 1:100 dilution and incubated for 30 minutes at 37°C. Visualize using a fluorescence microscope and filter sets appropriate for the label used.

PB9928 · IFIF analysis of CCT5 using anti-CCT5 antibody (PB9928). CCT5 was detected in immunocytochemical section of U20S cell. Enzyme antigen retrieva

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000150753-CCT5/tissue/cerebral+cortex#imid_2048232

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000150753-CCT5/tissue/colon#imid_2048166

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000150753-CCT5/tissue/liver#imid_2063935

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000150753-CCT5/tissue/kidney#imid_2063944

HPA · ICC-IF SpermHuman Protein Atlas immunofluorescence, Sperm, antibody HPA002238; green = CCT5, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

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

Sample controls for CCT5 IHC & IF

🧪Run lymph node first and score staining in germinal center cells (HPA: High in lymph node germinal center cells). Use heart muscle cardiomyocytes as the negative tissue (HPA: Not detected in cardiomyocytes); on the lymph node slide, any unstained neighboring cells should show only background, since no internal negative cell type is specified (HPA: lymph node row identifies germinal center cells only).

Positive control tissue: Caudate (Glial cells, HPA High)

Negative control tissue: Esophagus (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show CCT5 in Sperm, with annotated localisation: Mid piece (approved) (HPA subcellular).

Technical controls: Include a no-primary, secondary-only control and a host- and clonality-matched isotype control; the catalog primary is rabbit anti-CCT5 (selected IHC caption: rabbit anti-CCT5). Use confirmed CCT5 knockout material as a biological negative if available, and quench endogenous peroxidase and assess endogenous biotin background when using the caption’s biotin–streptavidin/DAB detection (selected IHC caption: biotinylated secondary, streptavidin–biotin complex and DAB; standard IHC practice).

⚠️Feasibility: A CCT5-specific fixation window or fixation effect is unreported, and the selected PB9928 paraffin-section caption does not state the fixative (selected IHC caption: fixative unreported). The reported IHC procedure uses heat retrieval in citrate buffer at pH 6 for 20 minutes (selected IHC caption: citrate retrieval); the supplied evidence does not establish whether frozen sections or IF would be easier. In lymph node, endogenous peroxidase or biotin background could complicate interpretation of the reported chromogenic detection (selected IHC caption: biotin–streptavidin/DAB detection; standard IHC practice).

HPA tissue IHC evidence for CCT5

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data. Nuclear positivity in CNS viewed as off target 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
Caudate	Glial cells	High	Protein (IHC)	HPA →
Fallopian tube	Glandular cells	High	Protein (IHC)	HPA →
Lymph node	Germinal center cells	High	Protein (IHC)	HPA →
Parathyroid gland	Glandular cells	High	Protein (IHC)	HPA →
Placenta	Cytotrophoblasts	High	Protein (IHC)	HPA →

Undetected expression · recommended negative controls

Tissue	Cell type	Level	Evidence	Source
Esophagus	Squamous epithelial cells	Not detected	Protein (IHC)	HPA →
Heart muscle	Cardiomyocytes	Not detected	Protein (IHC)	HPA →
Liver	Cholangiocytes	Not detected	Protein (IHC)	HPA →
Smooth muscle	Smooth muscle cells	Not detected	Protein (IHC)	HPA →
Vagina	Squamous epithelial cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced CCT5 IHC Tips

Troubleshoot CCT5 staining in paraffin sections by checking retrieval, tissue handling, cytoplasmic localisation and cell type before interpreting chromogenic signal.

How should I retrieve CCT5 in paraffin sections when staining is weak?

Start with heat-mediated citrate antigen retrieval at pH 6 for 20 minutes (datasheet PB9928). The selected tissue image used this condition before incubation with 1 µg/mL primary antibody overnight at 4°C (datasheet PB9928). If staining remains weak, compare a small retrieval time series on adjacent sections while holding antibody concentration, detection and imaging constant (standard IHC practice). Include a known positive cell population, such as fallopian-tube glandular cells, to distinguish retrieval failure from a genuinely weak sample (HPA: High in fallopian-tube glandular cells). Record tissue damage alongside signal intensity so harsher heating does not become the default solely because it increases chromogen deposition (standard IHC practice).

Can I infer how fixation affects CCT5 staining from the available tissue image?

No target-specific fixation sensitivity is established here: the selected paraffin-section caption does not state a fixative (datasheet PB9928). Record the fixative, fixation duration and processing history for each specimen before comparing CCT5 intensity across batches (standard IHC practice). If an established positive control weakens after a processing change, compare matched sections using the documented citrate pH 6, 20-minute retrieval condition (datasheet PB9928; standard IHC practice). Keep section thickness, primary incubation and chromogen development consistent during that comparison (standard IHC practice). A change in staining under those conditions can guide local optimisation, but the caption alone cannot identify fixation as its cause (datasheet PB9928).

Where should convincing CCT5 chromogenic staining appear within cells?

Prioritise cytoplasmic staining when reading CCT5 paraffin sections (UniProt P48643: cytoplasm; HPA: general cytoplasmic expression). CCT5 is also associated with the cytoskeleton and centrosome, so a more concentrated cytoplasmic pattern can be plausible if cell detail is preserved (UniProt P48643: subcellular location). It has no annotated transmembrane segment; an exclusively crisp membrane outline therefore warrants a detection and morphology check (UniProt P48643: topology). Treat isolated nuclear staining cautiously, particularly in central nervous system material, where nuclear positivity was disregarded as off target in the tissue profile (HPA: reliability description). Compare adjacent cells and a no-primary control before assigning a faint compartment-specific signal (standard IHC practice).

Could isoforms or epitope accessibility explain discordant CCT5 staining?

CCT5 has 2 annotated isoforms, but the supplied antibody caption does not identify its epitope or establish isoform-specific recognition (UniProt P48643: isoforms; datasheet PB9928). Its annotated modified residues include acetylation at position 2 and phosphorylation at positions 26, 346 and 539 (UniProt P48643: modified residues). Those annotations alone do not show that any modification changes this antibody’s staining (UniProt P48643: modified residues; datasheet PB9928). For discordant sections, compare matched processing and retrieval first, then seek epitope-mapping or isoform-validation data for the exact reagent (standard IHC practice). Interpret an apparently absent compartment against cell morphology and a positive tissue control before proposing isoform restriction (standard IHC practice).

How can IF help check an ambiguous CCT5 IHC pattern?

On a companion IF section, multiplex CCT5 with a marker that identifies the expected cell population, then compare cell identity with the chromogenic section (standard IF practice). For example, fallopian-tube glandular cells are a reported high-expression population, whereas esophageal squamous epithelial cells were not detected in the tissue profile (HPA: tissue IHC). Choose a fluorophore channel after inspecting unstained tissue autofluorescence, and include single-label controls when separating overlapping signals (standard IF practice). CCT5 has no annotated transmembrane segment and is predominantly cytoplasmic, so use permeabilisation appropriate for an intracellular epitope and verify morphology after treatment (UniProt P48643: topology and subcellular location; standard IF practice). The sperm mid-piece IF localisation is cell-context evidence, not a paraffin-section staining specification (HPA: subcellular).

What should I check when DAB staining appears widespread or uneven?

Check a no-primary control, endogenous peroxidase blocking and chromogen development before attributing diffuse brown signal to CCT5 (standard chromogenic IHC practice). The selected image used a biotinylated secondary, a streptavidin–biotin detection complex and DAB, so include a detection-only control when evaluating background from that workflow (datasheet PB9928; standard IHC practice). Compare intact central tissue with folds, torn edges and necrotic regions, which can retain reagent or complicate interpretation (standard IHC practice). CCT5 is broadly cytoplasmic in the tissue profile, so widespread cellular staining is possible, but extracellular deposits or staining without cell detail require scrutiny (HPA: tissue IHC; standard IHC practice). Keep the 1 µg/mL primary condition fixed while isolating a background source (datasheet PB9928).

How should I score CCT5 staining across heterogeneous tissue regions? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and viable analysis area before scoring, and exclude folds, edges and necrosis using the same rule for every section (standard IHC practice). For cytoplasmic CCT5, report an H-score from staining intensity and the percentage of cells at each intensity, alongside the percentage positive if that measure answers the study question (HPA: cytoplasmic profile; standard IHC practice). Normalise counts to the number of eligible cells, or report positive-cell density per mm² of viable analysed tissue when cell counting is impractical (standard IHC practice). Use the same threshold, counterstain review and chromogen development across batches (standard IHC practice). Document the scored cell type because CCT5 abundance varies among tissue populations (HPA: tissue IHC).

How do I distinguish true CCT5 positivity from staining artefact?

Call a signal convincing when it follows preserved cell boundaries, is mainly cytoplasmic and recurs in the same cell population across well-processed sections (UniProt P48643: subcellular location; HPA: tissue IHC; standard IHC practice). High staining in lymph-node germinal-center cells or placental cytotrophoblasts is compatible with the tissue profile, while esophageal squamous epithelial cells were reported as not detected (HPA: tissue IHC). Isolated nuclear positivity in central nervous system material needs particular caution because the tissue assessment disregarded it as off target (HPA: reliability description). Discount edge effects and necrotic deposits, and check a no-primary control for endogenous enzyme or detection-system signal (standard IHC practice). Resolve unexpected patterns with an independently established positive control before interpreting biological differences (standard IHC practice).

Boster reagents

Best CCT5 / T-complex protein 1 subunit epsilon IHC Antibodies

PB9928 has IHC images from paraffin sections of human intestinal cancer tissue and mouse and rat ovary, plus an IF image from U20S cells (catalog image captions).

Real IHC data

Anti-TCP1 epsilon/CCT5 Antibody ®

Cat # PB9928

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PB9928 is listed for IHC and IF, with human, mouse and rat reactivity (catalog applications and reactivity). Its IHC captions show paraffin sections of human intestinal cancer tissue and mouse and rat ovary; its IF caption shows U20S cells (catalog image captions).

Which to pick: For tissue IHC, choose PB9928: its images document paraffin sections with citrate retrieval at pH 6 for 20 minutes (PB9928 IHC captions); the fixative is unreported (PB9928 IHC captions). For IF/ICC, PB9928 is listed for both applications and has an IF image from U20S cells (catalog applications; PB9928 IF caption). For work across human, mouse and rat, PB9928 lists reactivity in all three and has an IHC image for each species; its host is rabbit, while clonality is unreported (catalog reactivity and host; PB9928 IHC captions; catalog clone field).

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

References

UniProt Consortium. UniProt entry P48643 (TCPE_HUMAN, T-complex protein 1 subunit epsilon).
Human Protein Atlas. CCT5 tissue IHC expression (reliability: Enhanced).
Human Protein Atlas. CCT5 subcellular location (ICC-IF): Mainly localized to the mid piece. In addition localized to the principal piece and annulus..
Human Protein Atlas. CCT5 antibody validation summary (3 antibodies).
Chaperonin containing TCP1 subunit 5 is a tumor associated antigen of non-small cell lung cancer. Oncotarget 2017 — PMC5609992.
Increased CCT5 expression is a potential unfavourable factor promoting the growth of nasopharyngeal carcinoma. The Journal of international medical research 2024 — PMC11409311.
CCT5 maintains mitotic fidelity and promotes early colorectal tumorigenesis. iScience 2026 — PMC13014677.
Integrated bioinformatics and in vitro validation reveal the role of CCT5 in immune infiltration and the Wnt pathway in colon cancer. Discover oncology 2026 — PMC13260463.
PubMed PMID:7788527 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:15372022 — UniProt-cited evidence.