CCT2 / T-complex protein 1 subunit beta · IHC design guide

Design Immunohistochemistry for CCT2

Plan CCT2 chromogenic IHC in paraffin sections using cytoplasmic staining as the expected pattern (HPA tissue IHC). Use testis late spermatids as a strong positive reference and assess signal by cell type (HPA tissue IHC).

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

Immunohistochemistry protocol sheet for CCT2 (IHC for CCT2): expected localisation Cytoplasmic staining in most tissues (HPA tissue IHC), antibody PB9992, validated IHC image, and IHC protocol steps — Printable **CCT2** IHC protocol sheet — expected localisation Cytoplasmic staining in most tissues (HPA tissue IHC), antibody PB9992, controls and protocol steps. Open the full CCT2 IHC guide →

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CCT2 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 staining in most tissues (HPA tissue IHC)
	Staining pattern	Cytoplasmic signal, highest in testis late spermatids (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet PB9992)
	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); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image PB9992)
	Caveat	Staining has medium consistency with RNA expression (HPA tissue IHC)
	Regulation	No expression regulator annotated (UniProt)
	Isoform / epitope	2 isoforms; epitope differences unreported (UniProt)

Section 1

Recommended CCT2 IHC & IF Protocols

Compare the catalog antibody’s IHC-P protocol (datasheet: PB9992) with published CCT2 IHC methods for HNSCC, gallbladder carcinoma, and paraffin sections (PMC13485502; PMC3691597; PMC12574043).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded rat gaster tissues; fixative not specified (datasheet PB9992)
Fixation	Image fixative and duration unreported (datasheet PB9992); 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 PB9992)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet PB9992)
Primary antibody	Rabbit anti-CCT2, 0.5-1μg/ml (datasheet PB9992)
Primary incubation	Overnight at 4 °C (datasheet PB9992)
Detection	Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB9992)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	CCT2-positive staining in elongated or late spermatids of testis (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in most tissues, most abundant in testis. No signal in the no-primary control.

💡Decision noteStart with heat-mediated citrate retrieval at pH 6 (datasheet: PB9992); the HNSCC protocol also used sodium citrate at pH 6.0 (PMC13485502).

Section 2

What Is the Expected CCT2 Staining Pattern?

CCT2 should stain predominantly in the cytoplasm, consistent with its UniProt localization and lack of a transmembrane segment (UniProt P78371: cytoplasm; no transmembrane segment). HPA reports cytoplasmic expression in most tissues, with the strongest listed staining in elongated or late spermatids in testis (HPA: tissue IHC). Its tissue IHC reliability is Enhanced, although antibody staining and RNA expression show medium consistency (HPA: tissue IHC reliability).

What am I looking at on my slide?
Strong cytoplasmic staining in elongated or late spermatids, with little nuclear signal.	This is the clearest listed positive pattern: those testis cells score High (HPA: testis IHC). Assess the cells and compartment together; HPA also reports cytoplasmic expression across most tissues (HPA: tissue IHC).
Cytoplasmic staining in glandular, hematopoietic, glial, or neuronal cells.	Medium staining is listed for adrenal, appendix, breast, and cervix glandular cells; bone marrow hematopoietic cells; caudate glia; and cerebral cortex neurons (HPA: tissue IHC). A weaker result than testis can therefore still fit the reference pattern.
Predominantly nuclear or sharply cell-surface staining.	This conflicts with the reported cytoplasmic pattern and supported cytosolic ICC-IF location (HPA: tissue IHC; subcellular). UniProt lists no transmembrane segment (UniProt P78371: topology). Check morphology, counterstain, and detection controls before interpreting it as CCT2.
Strong signal in adipocytes, cardiomyocytes, myocytes, or squamous epithelium.	HPA lists these cell types as Not detected in their sampled tissues (HPA: tissue IHC). Unexpected signal raises cross-reactivity or endogenous detection activity as possibilities (general IHC practice); it does not prove either without controls.
Diffuse color over cells and surrounding tissue, or no signal in a known-positive testis section.	Diffuse color obscures compartment scoring and may reflect nonspecific detection (general IHC practice). An absent spermatid signal conflicts with HPA's High result (HPA: testis IHC); first check the run and tissue preservation before calling the sample negative.

💡Expected CCT2 appearanceCall a convincing positive when elongated or late spermatids show strong cytoplasmic signal (HPA: testis IHC); dominant nuclear staining, or strong staining in cell types listed as Not detected, warrants control review rather than a positive call (HPA: tissue IHC; general IHC practice).

How each factor affects the staining
Tissue and cell choice	Testis elongated or late spermatids provide a High reference; several glandular and other listed cell types score Medium (HPA: tissue IHC). Adipocytes and selected muscle or squamous cells score Not detected in sampled tissues (HPA: tissue IHC). Use the named cell type, not the tissue label alone, when judging a section.
HPA evidence strength	Tissue IHC reliability is Enhanced, while staining and RNA have medium consistency (HPA: tissue IHC reliability). HPA lists HPA003197 and HPA003198 as IHC Enhanced (HPA: antibody validation). These ratings support the observed reference pattern but do not guarantee identical staining with every catalog antibody or specimen.
Compartment and IF/ICC Q&A	Q: What should IF/ICC show? A: Mainly cytosol; HPA additionally reports the sperm connecting, mid, and principal pieces (HPA: subcellular ICC-IF). That localization helps interpret a discordant IHC image, but the IF/ICC application has its own guide and no IF/ICC protocol is specified here.
Isoforms and epitope coverage	UniProt lists two isoforms but supplies no antibody epitope or isoform-specific staining evidence (UniProt P78371: isoforms; HPA: antibody validation). An unusual pattern cannot be assigned to an isoform from these records. Check the chosen antibody's documented epitope before making an isoform claim.
Topology and processing	CCT2 is cytoplasmic, has no annotated transmembrane segment or signal peptide, and its listed chain spans residues 2–535 (UniProt P78371: subcellular location; topology; processing). This supports a cytoplasmic expectation; it does not establish how fixation or antigen retrieval affects this target.
Detection chemistry	Endogenous enzyme activity or residual nonspecific detection can create chromogenic color independent of primary-antibody binding (general IHC practice). A primary-omission control helps assess that background in the same tissue; it cannot alone establish antibody specificity (general IHC practice).

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Known-positive testis has no spermatid signal.	A failed staining run, unsuitable section, or weak detection is possible (general IHC practice); HPA expects High staining in elongated or late spermatids (HPA: testis IHC).	Confirm those cells are present, then review the catalog antibody's IHC-P instructions, reagent performance, and a positive control on the same run (general IHC practice). No CCT2-specific retrieval setting is supplied here.
Staining appears mainly nuclear.	The compartment conflicts with cytoplasmic tissue staining and supported cytosolic ICC-IF localization (HPA: tissue IHC; subcellular). Misreading dense cytoplasm or nonspecific staining is possible (general IHC practice).	Compare signal with the counterstain at higher magnification and inspect primary-omission and appropriate antibody controls (general IHC practice). Do not score a nuclear-only result as the expected pattern.
Strong color appears in cells listed as Not detected.	HPA reports no detection in sampled adipocytes, cardiomyocytes, myocytes, and certain squamous cells (HPA: tissue IHC). Cross-reactivity or endogenous detection activity is possible (general IHC practice).	Verify cell identity and compare primary-omission and appropriate specificity controls under the same detection conditions (general IHC practice). Treat the HPA result as a reference observation, not a universal negative guarantee.
Color is diffuse across tissue or empty areas.	Nonspecific detection, inadequate blocking, or excess chromogen development can obscure cellular boundaries (general IHC practice). This appearance cannot establish CCT2 localization.	Inspect a primary-omission control; review blocking, washing, and detection timing against the established IHC workflow (general IHC practice). Reassess only where cell boundaries and cytoplasm remain discernible.
Medium-positive tissue looks weaker than testis.	That difference may match the reference: testis spermatids score High, whereas the specified glandular, hematopoietic, glial, and neuronal cells score Medium (HPA: tissue IHC).	Score the correct cell population and compare runs using the same detection and counterstain conditions (general IHC practice). Avoid requiring testis-level intensity in a tissue listed as Medium.
A proposed IF/ICC result seems different from the IHC section.	HPA's supported main ICC-IF location is cytosol, with additional sperm-piece locations (HPA: subcellular ICC-IF); tissue IHC describes cytoplasmic expression (HPA: tissue IHC). The records do not establish an application-specific epitope effect.	Use compartment and cell identity for comparison, then consult the separate IF/ICC guide for that application. Keep this section's protocol decisions tied to the catalog antibody's IHC-P instructions (general IHC practice).

Source: UniProt P78371 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing CCT2 staining

IHC analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 was detected in paraffin-embedded section of rat gaster 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-CCT2 Antibody (PB9992) 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.

PB9992 · IHCIHC analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 was detected in paraffin-embedded section of rat gaster tissues. Heat mediated

IHC analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 was detected in paraffin-embedded section of human testis 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-CCT2 Antibody (PB9992) 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.

PB9992 · IHCIHC analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 was detected in paraffin-embedded section of human testis tissues. Heat mediate

IF analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 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-CCT2 Antibody (PB9992) 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.

PB9992 · IFIF analysis of CCT2 using anti-CCT2 antibody (PB9992). CCT2 was detected in immunocytochemical section of U20S cell. Enzyme antigen retrieva

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000166226-CCT2/tissue/cerebral+cortex#imid_1171856

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000166226-CCT2/tissue/colon#imid_1171774

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000166226-CCT2/tissue/liver#imid_1171783

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000166226-CCT2/tissue/kidney#imid_1171776

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA003198; green = CCT2, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

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

Sample controls for CCT2 IHC & IF

🧪Run testis first: elongated or late spermatids should stain (HPA: High). Use adipose tissue adipocytes as the negative comparator (HPA: Not detected); on the testis slide, treat neighboring cells without cytoplasmic signal as internal background only after confirming their morphology and staining (HPA: testis row identifies spermatids, but no internal negative cell type).

Positive control tissue: Testis (Elongated or late spermatids, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show CCT2 in A-431, U2OS, RPTEC/TERT1, hTERT-RPE1 (serum starved), Sperm, with annotated localisation: Cytosol (supported) (HPA subcellular).

Technical controls: Include a no-primary (secondary-only) control, a host- and clonality-matched rabbit IgG isotype control, and CCT2 knockout material or immunizing-peptide competition where available (caption: rabbit anti-CCT2; standard IHC practice). Quench endogenous peroxidase and check for endogenous biotin in testis sections when using the caption’s biotin–SABC/DAB detection (caption: biotinylated secondary and SABC/DAB; standard IHC practice).

⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected PB9992 paraffin-section caption does not state a fixative (caption: fixative not stated). Heat retrieval in citrate buffer at pH 6 for 20 minutes was used for rat gaster IHC, but retrieval dependence in testis is unreported (caption: rat gaster retrieval). Neither frozen sections nor IF/ICC is established as easier; densely packed spermatids can complicate cell-level scoring in testis, so assess staining against the control slide (HPA: High in elongated or late spermatids; standard IHC practice).

HPA tissue IHC evidence for CCT2

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — Medium 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	Elongated or late spermatids	High	Protein (IHC)	HPA →
Adrenal gland	Glandular cells	Medium	Protein (IHC)	HPA →
Appendix	Glandular cells	Medium	Protein (IHC)	HPA →
Bone marrow	Hematopoietic cells	Medium	Protein (IHC)	HPA →
Breast	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 →
Esophagus	Squamous epithelial cells	Not detected	Protein (IHC)	HPA →
Heart muscle	Cardiomyocytes	Not detected	Protein (IHC)	HPA →
Kidney	Cells in glomeruli	Not detected	Protein (IHC)	HPA →
Oral mucosa	Squamous epithelial cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced CCT2 IHC Tips

Troubleshoot CCT2 staining in paraffin sections by checking retrieval, cell compartment, controls and scoring before interpreting differences in signal.

What retrieval conditions should I try when CCT2 staining is weak?

Start with heat-mediated retrieval in citrate buffer at pH 6 for 20 minutes (datasheet PB9992). That condition accompanies CCT2 staining in a paraffin-embedded rat gaster section, but the caption does not state the fixative (datasheet PB9992). Keep section thickness, heating and cooling consistent across the comparison, then titrate the IHC-validated antibody around the caption’s 1 µg/mL starting concentration (datasheet PB9992). If staining remains weak, compare a second retrieval condition on adjacent sections while retaining the citrate condition as a reference. Judge any gain by cleaner cytoplasmic signal in the expected cells, since CCT2 is cytoplasmic (UniProt P78371; HPA: cytoplasmic expression in most tissues).

Could fixation explain weak or uneven CCT2 staining in paraffin sections?

Target-specific CCT2 sensitivity to fixation is unknown from the supplied evidence; the selected paraffin-section caption does not identify its fixative (datasheet PB9992). Record the fixative, duration and processing history for each specimen before attributing a staining difference to CCT2 abundance. On matched sections, hold citrate retrieval at pH 6 for 20 minutes constant while checking whether weak signal tracks with a particular processing batch (datasheet PB9992). Uneven fixation or processing can cause patchy staining in paraffin IHC, so inspect section centers and edges separately. Use an independently characterized control section to assess the staining run before interpreting the experimental sections.

Where should CCT2 signal appear, and how should unexpected nuclear staining be handled?

Score predominantly cytoplasmic staining in paraffin IHC: UniProt places CCT2 in the cytoplasm, and HPA reports a supported cytosolic location (UniProt P78371; HPA: cytosol supported). HPA describes cytoplasmic expression across most tissues and high staining in elongated or late spermatids (HPA: tissue IHC). Its subcellular record also lists the connecting, mid and principal pieces as additional locations, which matters when examining sperm (HPA: subcellular). If nuclear staining dominates, inspect the counterstain, section morphology and no-primary control before accepting it as CCT2. Compare any unusual pattern with cytoplasmic staining on a control section processed in the same run.

Can isoforms or epitope accessibility change how I interpret CCT2 staining?

UniProt lists 2 CCT2 isoforms, but the supplied antibody caption does not identify an epitope or establish isoform-specific staining (UniProt P78371; datasheet PB9992). Treat chromogenic signal as antibody-reactive CCT2 staining rather than assigning it to either isoform. The record lists no transmembrane segment, no signal peptide and several modified residues, including phosphoserines at positions 3 and 60 (UniProt P78371). Those annotations alone do not show that a modification changes this antibody’s binding in paraffin sections. If isoform or modification dependence matters, obtain epitope documentation and validate specificity with an appropriate independent control before comparing specimens.

How can I check a CCT2 pattern by multiplex IF without overinterpreting it?

Use multiplex IF as a separate check of localisation: HPA supports cytosolic CCT2 and reports high tissue staining in elongated or late spermatids (HPA: subcellular; HPA: tissue IHC). Pair CCT2 with a validated marker of the expected cell population, and include single-label controls to identify channel bleed-through. Choose fluorophores after measuring tissue autofluorescence, reserving a spectrally cleaner channel for the weaker signal. CCT2 has no transmembrane segment and is cytoplasmic, so optimise permeabilisation for access to an intracellular epitope (UniProt P78371). The supplied PB9992 caption documents paraffin-section chromogenic IHC; it does not establish fixation, permeabilisation or antibody performance for IF (datasheet PB9992).

How do I distinguish CCT2 staining from diffuse chromogenic background?

CCT2 is cytoplasmic, so evaluate background against cell boundaries and the expected cytoplasmic pattern rather than total brown area (UniProt P78371; HPA: cytosol supported). The selected paraffin-section method used 10% goat serum, 1 µg/mL primary antibody, a biotinylated secondary and DAB development (datasheet PB9992). Run no-primary and secondary-only controls, and check whether staining persists in damaged areas or tissue edges. Peroxidase blocking and careful DAB timing are standard chromogenic IHC controls, not evidence of CCT2-specific behaviour. If background remains high, titrate the primary and verify washing, secondary specificity and detection chemistry on adjacent sections.

What is a defensible way to quantify CCT2 staining across sections? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and compartment before scoring; HPA reports cytoplasmic expression in most tissues and high staining in elongated or late spermatids (HPA: tissue IHC). For cell-rich regions, record the percentage of positive cells and an intensity-based H-score from 0–300; use positive-cell density per mm² when cell abundance differs. Score cytoplasmic DAB signal within viable tissue, using the same threshold, imaging settings and sampling rule for every section. Normalise positive-cell counts to the number of eligible cells or the analysed tissue area, as appropriate. Keep tissue type, cell type and staining batch separate in the analysis because their composition can change the apparent score.

When is an unusual CCT2-positive area likely to be artefactual?

A credible CCT2-positive cell should show a cytoplasmic pattern consistent with UniProt and HPA localisation (UniProt P78371; HPA: cytosol supported). Check its identity against the expected population: HPA reports high staining in elongated or late spermatids, while several listed cell populations are not detected (HPA: tissue IHC). Treat staining confined to cut edges, folds or necrotic areas cautiously, and compare it with intact tissue on the same slide. Persistent colour in a no-primary control suggests detection background, including endogenous enzyme activity, rather than antibody-dependent CCT2 staining. Confirm a surprising result with morphology, an appropriate control section and consistent staining across independently processed sections.

Boster reagents

Best CCT2 / T-complex protein 1 subunit beta IHC Antibodies

The catalog lists anti-CCT2 antibodies reactive with human, mouse, and rat samples (catalog: reactivity); PB9992 has paraffin-section IHC and cell IF images (PB9992 image captions).

Real IHC data

Anti-TCP1 beta/CCT2 Antibody ®

Cat # PB9992

View product →

PB9992 has paraffin-section IHC images from human testis and rat and mouse gaster, plus IF images from U2OS cells (PB9992 image captions). M05524-2 lists IHC and ICC/IF for human, mouse, and rat, but has no IHC or IF image captions (catalog: applications, reactivity, image alts).

Which to pick: For tissue IHC, choose PB9992: its images document paraffin sections from all three listed species, though the fixative is unreported (PB9992 IHC image captions). For IF/ICC, PB9992 has a U2OS IF image; M05524-2 is a rabbit monoclonal with ICC/IF listed but no image caption (PB9992 IF image captions; M05524-2 catalog: clone, applications, image alts). Both list human, mouse, and rat reactivity, but PB9992 has IHC images for each species (catalog: reactivity; PB9992 IHC image captions).

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

References

UniProt Consortium. UniProt entry P78371 (TCPB_HUMAN, T-complex protein 1 subunit beta).
Human Protein Atlas. CCT2 tissue IHC expression (reliability: Enhanced).
Human Protein Atlas. CCT2 subcellular location (ICC-IF): Mainly localized to the cytosol. In addition localized to the connecting piece, mid piece and principal piece..
Human Protein Atlas. CCT2 antibody validation summary (2 antibodies).
Comprehensive prognostic and immunological analysis of CCT2 in pan-cancer. Frontiers in oncology 2022 — PMC9476648.
CCT2 enhances c-Myc stabilization to drive tumor progression and chemoresistance in head and neck squamous cell carcinoma. Genes & diseases 2026 — PMC13485502.
Clinicopathological features and CCT2 and PDIA2 expression in gallbladder squamous/adenosquamous carcinoma and gallbladder adenocarcinoma. World journal of surgical oncology 2013 — PMC3691597.
Identification of metabolic reprogramming-associated biomarkers in endometriosis through integrated bioinformatics analysis. Hereditas 2025 — PMC12574043.
PubMed PMID:9819444 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:19054851 — UniProt-cited evidence.