HDAC6 / Protein deacetylase HDAC6 · IHC design guide

Design Immunohistochemistry for HDAC6

Plan paraffin IHC for HDAC6 using the catalog antibody. Expect cytoplasmic staining in most cell types, with prominent signal in renal tubules and cells in seminiferous ducts (HPA tissue IHC); interpret nuclear signal in light of HDAC6 shuttling (UniProt).

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

Immunohistochemistry protocol sheet for HDAC6 (IHC for HDAC6): expected localisation Cytoplasmic in tissue (HPA tissue IHC); can shuttle to nucleus (UniProt), antibody PB9628, validated IHC image, and IHC protocol steps — Printable **HDAC6** IHC protocol sheet — expected localisation Cytoplasmic in tissue (HPA tissue IHC); can shuttle to nucleus (UniProt), antibody PB9628, controls and protocol steps. Open the full HDAC6 IHC guide →

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HDAC6 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 in tissue (HPA tissue IHC); can shuttle to nucleus (UniProt)
	Staining pattern	Cytoplasmic in most cells; strongest in renal tubules and seminiferous ducts (HPA tissue IHC)
	Antigen retrieval	EDTA pH 8.0 HIER, heat-mediated (datasheet PB9628)
	Positive control ⓘ	Breast+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	Antibody staining and RNA expression have low consistency (HPA tissue IHC)
	Regulation	Intensity regulation is unreported (UniProt)
	Isoform / epitope	2 isoforms; no extracellular epitope expected; epitope map unknown (UniProt)

Section 1

Recommended HDAC6 IHC & IF Protocols

The catalog antibody’s IHC-P protocol (datasheet PB9628) is accompanied by four published HDAC6 IHC protocols (PMC12127455; PMC13256419; PMC7762972; PMC7751721).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded human breast cancer tissue; fixative not specified (datasheet PB9628)
Fixation	Image fixative and duration unreported (datasheet PB9628); verify before use.
Sectioning	4–5 µm sections on charged slides (standard)
Deparaffinisation	Xylene, graded ethanol series to water (standard)
Antigen retrieval	Heat retrieval: EDTA pH 8.0 (datasheet PB9628); 20 min, 95–100 °C (standard)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet PB9628)
Primary antibody	Rabbit anti-HDAC6, 2-5 μg/ml (datasheet PB9628)
Primary incubation	Overnight at 4 °C (datasheet PB9628)
Detection	HRP-conjugated secondary, DAB chromogen (datasheet PB9628)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	HDAC6-positive staining in glandular cells of breast (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in most cell types, most abundant in renal tubules and cells in seminiferous ducts. No signal in the no-primary control.

💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval (datasheet PB9628); citrate pH 6.0 offers a published comparison (PMC7751721).

Section 2

What Is the Expected HDAC6 Staining Pattern?

HDAC6 should stain mainly the cytoplasm, particularly in breast glandular cells, skin keratinocytes and testicular pachytene spermatocytes, where HPA reports high staining (HPA tissue IHC; UniProt Q9UBN7 localization). It has no transmembrane segment, so a membrane-restricted pattern is unexpected (UniProt Q9UBN7 topology). HPA rates its tissue IHC evidence Supported while reporting low consistency between antibody staining and RNA expression (HPA tissue IHC).

What am I looking at on my slide?
Cytoplasmic staining is clear in breast glandular cells, skin keratinocytes or pachytene spermatocytes, with weaker staining in some other cell types.	This fits the reported high staining in those cells and cytoplasmic expression across most cell types (HPA tissue IHC). Score the named cell population and its cytoplasmic compartment; a positive area elsewhere in the section does not establish that the intended cells are positive (general IHC practice).
Staining is predominantly nuclear, or traces cell membranes while cytoplasm is blank.	A membrane-restricted pattern conflicts with the reported mainly cytoplasmic localization and lack of a transmembrane segment (UniProt Q9UBN7 localization and topology). Predominantly nuclear staining warrants checking the controls and morphology: HDAC6 can shuttle into nuclei under particular conditions, so an isolated nuclear signal is not conclusive evidence of an artefact (UniProt Q9UBN7 localization; general IHC practice).
Strong signal appears in adipocytes or skeletal muscle myocytes, while an expected positive cell population is also present.	HPA reports HDAC6 as not detected in adipocytes and skeletal muscle myocytes (HPA tissue IHC). Review that unexpected staining for antibody cross-reactivity or endogenous detection activity, using appropriate controls; a negative HPA observation alone cannot prove either cause in this specimen (general IHC practice).
Chromogen is spread across stroma, lumen or much of the section without a readable cellular boundary.	Treat this as diffuse background until cell-associated staining can be distinguished from it (general IHC practice). Excess detection activity, incomplete blocking or overly concentrated antibody are general IHC possibilities; the supplied HPA and UniProt records do not identify which applies to this section.
A section containing a reported high-staining cell population has no interpretable cytoplasmic signal.	A blank positive control makes a biological negative call unreliable (general IHC practice). Confirm that the expected cells are present, then check the antibody, retrieval and detection workflow against its validated IHC-P instructions (general IHC practice). HPA's high staining is a reference pattern, not a guarantee for every specimen (HPA tissue IHC).

💡Expected HDAC6 appearanceCall positive when cytoplasmic staining is clearly cell-associated in breast glandular cells, skin keratinocytes or pachytene spermatocytes, where HPA reports high staining; diffuse chromogen or isolated membrane outlining is a suspect positive pattern (HPA tissue IHC; UniProt Q9UBN7 localization and topology; general IHC practice).

How each factor affects the staining
Cell population selected for comparison	HPA reports high staining in breast glandular cells, skin keratinocytes and pachytene spermatocytes; it reports adipocytes and skeletal muscle myocytes as not detected (HPA tissue IHC). Compare like cell types when judging intensity. The HPA profile also describes cytoplasmic expression in most cell types, so a whole-tissue positive/negative label can obscure cellular variation (HPA tissue IHC).
Compartment and cell state	HDAC6 is mainly cytoplasmic and microtubule associated, but UniProt also reports nuclear shuttling under particular conditions (UniProt Q9UBN7 localization). Nuclear signal therefore needs its cellular context and controls. HPA ICC-IF supports cytosol, centrosome and basal body localization; its additional nucleoplasm assignment is uncertain (HPA subcellular ICC-IF).
Strength of reference evidence	HPA calls tissue IHC reliability Supported and notes low consistency between staining and RNA expression (HPA tissue IHC). Its listed antibodies HPA003714, HPA026321 and CAB004236 each have Supported IHC status (HPA antibody validation). Use those observations as pattern benchmarks, while keeping antibody-specific control results central to an interpretation (general IHC practice).
Isoforms and antibody recognition	UniProt lists two HDAC6 isoforms and one annotated protein chain spanning residues 1–1215 (UniProt Q9UBN7 isoforms and processing). The supplied records do not map the catalog antibody's epitope to either isoform. Do not assign a compartment difference or a missing signal to isoform selectivity without antibody-specific evidence.
What should IF/ICC show?	Mainly cytosol, centrosome and basal body signal is supported; nucleoplasm is an additional uncertain location (HPA subcellular ICC-IF). That is an IF/ICC localization reference, not an IHC-P protocol or a requirement to resolve those small structures in a chromogenic tissue section (general IHC practice).

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Expected high-staining cells are blank.	The expected cells may be absent from the section, or the IHC-P staining or detection workflow may have failed (general IHC practice; HPA tissue IHC for expected cells).	Identify the cells on the counterstained section, run a known-positive section alongside it, and verify each step against the IHC-validated antibody's instructions (general IHC practice). Interpret the sample only after the control gives readable cytoplasmic signal.
Nuclear signal dominates the positive cells.	This departs from the mainly cytoplasmic baseline, although condition-dependent nuclear HDAC6 is documented (UniProt Q9UBN7 localization). The image alone cannot distinguish a biological shift from staining artefact.	Check nuclear boundaries and matched positive and detection controls, then compare cytoplasmic and nuclear staining in the same cell type (general IHC practice). Record nuclear localization as a separate observation rather than counting every stained nucleus as a routine positive.
Adipocytes or skeletal muscle myocytes stain strongly.	Those cell types are reported as not detected by HPA; cross-reactivity or endogenous detection activity are possibilities, not established diagnoses (HPA tissue IHC; general IHC practice).	Check cell identity and morphology, inspect a no-primary control for detection background, and compare the unexpected signal with a reported high-staining cell population on matched sections (general IHC practice; HPA tissue IHC).
Brown staining covers extracellular areas and masks cell borders.	Diffuse deposit prevents reliable assignment of stain to cells (general IHC practice). The supplied HDAC6 records do not identify a target-specific source for that background.	Review the no-primary control, blocking and washes, then adjust antibody or detection conditions according to the validated IHC-P workflow (general IHC practice). Reassess localization only when cell boundaries are visible.
Only membrane outlines are scored as positive.	A membrane-restricted call conflicts with HDAC6's reported mainly cytoplasmic localization and lack of a transmembrane segment (UniProt Q9UBN7 localization and topology).	Recheck whether cytoplasm contains distinct signal and whether outlines also appear in a detection control (general IHC practice). If staining remains confined to borders, flag the result for specificity review instead of using it as the expected HDAC6 pattern.
Two specimens show different proportions of positive cells.	HPA reports variation by cell type, including high, medium, low and not-detected observations; its IHC profile also has low consistency with RNA expression (HPA tissue IHC). A difference alone cannot establish technical failure or biological change.	Compare the same identified cell population, compartment and scoring threshold, and confirm that both runs have usable positive controls (general IHC practice). Report the observed difference with its cell-type context and HPA evidence limit.

Source: UniProt Q9UBN7 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing HDAC6 staining

IHC analysis of HDAC6 using anti-HDAC6 antibody (PB9628). HDAC6 was detected in a paraffin-embedded section of human breast cancer tissue. Heat mediated antigen retrieval was performed in EDTA buffer (pH 8.0, epitope retrieval solution). The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 2 μg/ml rabbit anti-HDAC6 Antibody (PB9628) overnight at 4°C. Peroxidase Conjugated Goat Anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using HRP Conjugated Rabbit IgG Super Vision Assay Kit (Catalog # SV0002) with DAB as the chromogen.

PB9628 · IHCIHC analysis of HDAC6 using anti-HDAC6 antibody (PB9628). HDAC6 was detected in a paraffin-embedded section of human breast cancer tissue. H

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000094631-HDAC6/tissue/cerebral+cortex#imid_1474572

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000094631-HDAC6/tissue/colon#imid_1474498

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000094631-HDAC6/tissue/liver#imid_1474499

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000094631-HDAC6/tissue/kidney#imid_1474500

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA026321; green = HDAC6, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

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

Sample controls for HDAC6 IHC & IF

🧪Run breast first: glandular cells should stain strongly (HPA: High in breast glandular cells). Use adipose tissue as the negative comparator (HPA: Not detected in adipocytes); on the breast slide, cells lacking specific signal should appear DAB-negative or show only faint background, without assuming a particular neighboring cell type is HDAC6-negative.

Positive control tissue: Breast (Glandular cells, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show HDAC6 in A-431, U-251MG, U2OS, HeLa, Rh30, ASC52telo, RPTEC/TERT1, hTERT-RPE1 (serum starved), Sperm, KOLF2.1J, with annotated localisation: Centrosome (supported), Basal body (supported), Cytosol (supported) (HPA subcellular).

Technical controls: Include a no-primary, secondary-only control; a rabbit control IgG matched to the primary antibody’s isotype and clonality; and, where available, HDAC6-knockout tissue as a biological negative (selected PB9628 caption: rabbit primary antibody). Block endogenous peroxidase and check for residual DAB signal in the no-primary control, particularly around blood or inflammatory cells (standard chromogenic IHC practice).

⚠️Feasibility: A target-specific fixation window and fixation effect are unreported, and the selected PB9628 paraffin-section caption does not state a fixative (selected PB9628 caption). The demonstrated IHC preparation used heat-mediated retrieval in EDTA at pH 8.0 before staining human breast cancer tissue; whether another retrieval condition works, or whether frozen sections or IF are easier, is unreported (selected PB9628 caption). In breast sections, distinguish glandular staining from residual peroxidase-associated DAB signal using the no-primary control (HPA: High in breast glandular cells; standard chromogenic IHC practice).

HPA tissue IHC evidence for HDAC6

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Supported — Low 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
Breast	Glandular cells	High	Protein (IHC)	HPA →
Skin	Keratinocytes	High	Protein (IHC)	HPA →
Testis	Pachytene spermatocytes	High	Protein (IHC)	HPA →
Adrenal gland	Glandular cells	Medium	Protein (IHC)	HPA →
Appendix	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 →
Bronchus	Basal cells	Not detected	Protein (IHC)	HPA →
Hippocampus	Glial cells	Not detected	Protein (IHC)	HPA →
Skeletal muscle	Myocytes	Not detected	Protein (IHC)	HPA →
Smooth muscle	Smooth muscle cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced HDAC6 IHC Tips

Troubleshoot chromogenic HDAC6 IHC in paraffin sections by checking retrieval, staining pattern, controls and compartment-specific scoring.

Which retrieval conditions should I use when HDAC6 staining is weak?

Use heat-mediated retrieval in EDTA at pH 8.0 for paraffin-section HDAC6 IHC (datasheet PB9628). The documented image used this retrieval before an overnight incubation at 4°C with 2 μg/ml antibody (PB9628 tissue-IHC caption). If staining is weak, compare sections processed together while changing heating duration in small increments and checking tissue integrity (standard IHC practice). Keep antibody concentration and detection conditions constant during that comparison so the retrieval effect is interpretable (standard IHC practice). Include a breast glandular-cell reference section, where HDAC6 staining is reported as high (HPA: Breast glandular cells, High).

How should I troubleshoot fixation-related loss of HDAC6 staining?

The PB9628 image documents a paraffin-embedded section, but its caption does not report a fixative (PB9628 tissue-IHC caption). Target-specific sensitivity to fixation is therefore unknown; record the fixative, fixation duration and processing history for each specimen before comparing staining (PB9628 tissue-IHC caption; standard IHC practice). Test suspect and reference sections in the same run using EDTA at pH 8.0 and 2 μg/ml primary antibody (datasheet PB9628; PB9628 tissue-IHC caption). Compare preserved cell morphology and staining in corresponding cell types, since damaged sections can confound a signal comparison (standard IHC practice). Do not attribute a difference to fixation until section handling and staining conditions have been checked (standard IHC practice).

Should HDAC6 appear in nuclei or around centrosomes in tissue sections?

Expect predominantly cytoplasmic staining in paraffin sections, consistent with HDAC6 association with microtubules (UniProt Q9UBN7 localisation; HPA tissue IHC profile). Centrosome and basal-body localization is supported by cell imaging, although these small structures may be difficult to resolve with chromogenic tissue IHC (HPA subcellular; standard IHC practice). Nuclear HDAC6 can be biologically plausible because the protein can shuttle between cytoplasm and nucleus (UniProt Q9UBN7 localisation). Score nuclear and cytoplasmic signal separately, and compare the nuclear pattern with adjacent morphology and controls (standard IHC practice). A diffuse extracellular outline warrants scrutiny because HDAC6 has no transmembrane segment (UniProt Q9UBN7 topology).

Could isoforms or epitope masking explain discordant HDAC6 staining?

HDAC6 has 2 annotated isoforms, but the supplied PB9628 caption does not identify the antibody epitope (UniProt Q9UBN7 isoforms; PB9628 tissue-IHC caption). Do not assign an isoform to a chromogenic staining pattern without antibody epitope mapping or independent validation (standard IHC practice). HDAC6 has annotated modified residues, including phosphoserine 22 and phosphothreonines 1016, 1021 and 1027 (UniProt Q9UBN7 modified residues). Their effect on this antibody's binding is unknown because its epitope is unreported (PB9628 tissue-IHC caption). For discordant specimens, compare retrieval-matched sections with a second antibody recognizing a documented distinct region, if available (standard IHC practice).

How should I check an HDAC6 pattern by multiplex immunofluorescence?

Treat IF/ICC as a separate assay when checking the pattern seen by chromogenic HDAC6 IHC (standard IHC/IF practice). In breast tissue, pair HDAC6 with a glandular epithelial marker such as pan-cytokeratin to identify the expected stained cells (HPA: Breast glandular cells, High; standard IF practice). Choose a spectrally separated, preferably far-red fluorophore after checking unstained tissue autofluorescence and single-stain controls (standard IF practice). HDAC6 is mainly cytoplasmic and has no transmembrane segment, so use controlled permeabilisation to access its intracellular epitope (UniProt Q9UBN7 localisation and topology; standard IF practice). Assess nuclear and centrosomal signals separately because both localizations are reported, with different levels of support (UniProt Q9UBN7 localisation; HPA subcellular).

What should I change when DAB staining obscures HDAC6?

First compare the stained section with a no-primary control to identify signal from detection reagents or endogenous enzyme activity (standard IHC practice). Quench endogenous peroxidase before HRP/DAB detection and inspect blood-rich or damaged areas separately (standard IHC practice). The PB9628 image used 10% goat serum for blocking, 2 μg/ml primary antibody overnight at 4°C, and a peroxidase-conjugated secondary for 30 minutes at 37°C (PB9628 tissue-IHC caption). If background persists, titrate primary antibody and strengthen appropriate wash steps while retaining a positive reference section (standard IHC practice). Evaluate cytoplasmic staining within intact cells rather than diffuse DAB deposits (UniProt Q9UBN7 localisation; standard IHC practice).

How should I score HDAC6 across heterogeneous paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and region of interest before scoring, then exclude folds, necrosis and section edges (standard IHC practice). For breast sections, glandular cells provide a reported high-staining reference population (HPA: Breast glandular cells, High). Record the percentage of positive cells and cytoplasmic intensity separately; an H-score can combine intensity grades 0–3 with percentages into a 0–300 range (standard IHC scoring practice). Score nuclear staining as a separate compartment because HDAC6 can enter the nucleus (UniProt Q9UBN7 localisation). Normalize comparisons to the number of eligible cells or evaluated tissue area, and keep staining runs and thresholds consistent (standard IHC practice).

How can I distinguish true HDAC6 staining from artefact?

A convincing pattern is intracellular and predominantly cytoplasmic in morphologically intact cells, matching reported HDAC6 localization (UniProt Q9UBN7 localisation; HPA tissue IHC profile). Breast glandular cells can serve as a positive comparator, while HPA reports adipocytes as not detected (HPA: Breast glandular cells, High; HPA: Adipocytes, Not detected). Treat sharp section-edge staining, necrotic deposits and signal retained in a no-primary control as possible processing or detection artefacts (standard IHC practice). Nuclear signal requires separate assessment because HDAC6 can shuttle into the nucleus (UniProt Q9UBN7 localisation). Interpret tissue differences cautiously: HPA rates its IHC evidence as supported but reports low consistency with RNA expression (HPA tissue IHC reliability).

Boster reagents

Best HDAC6 / Protein deacetylase HDAC6 IHC Antibodies

PB9628 has a real IHC figure from a human breast cancer paraffin section (PB9628 image caption). Human IF/ICC is listed for M00595, without an IF figure (M00595 catalog).

Real IHC data

Anti-HDAC6 Antibody ®

Cat # PB9628

View product →

PB9628 is the rendered SKU; its IHC figure shows a human breast cancer paraffin section (PB9628 image caption). It is listed for IHC in Human, Mouse, and Rat, although the supplied IHC figure shows human tissue only (PB9628 catalog; PB9628 image caption).

Which to pick: Choose PB9628 for paraffin-section IHC: its own figure documents EDTA retrieval at pH 8.0, 2 μg/ml primary antibody, and DAB detection; the fixative is unreported (PB9628 image caption). For IF/ICC, M00595 is the rabbit monoclonal option listed for human samples, with no supplied IF figure (M00595 catalog). For cross-species work, PB9628 lists Human, Mouse, and Rat reactivity, but its supplied IHC figure documents human tissue only (PB9628 catalog; PB9628 image caption).

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

References

UniProt Consortium. UniProt entry Q9UBN7 (HDAC6_HUMAN, Protein deacetylase HDAC6).
Human Protein Atlas. HDAC6 tissue IHC expression (reliability: Supported).
Human Protein Atlas. HDAC6 subcellular location (ICC-IF): Mainly localized to the cytosol, centrosome and basal body. In addition localized to the nucleoplasm..
Human Protein Atlas. HDAC6 antibody validation summary (3 antibodies).
Histone deacetylase 6 and programmed death ligand-1 expressions after neoadjuvant chemotherapy are upregulated in patients with ovarian high-grade serous carcinoma. Scientific reports 2025 — PMC12127455.
Immune Infiltration and Mitochondrial Function in Diabetic Kidney Disease: WGCNA and Machine Learning Identified Hub Genes with Clinical Validation. International journal of molecular sciences 2026 — PMC13256419.
HDAC6 Degradation Inhibits the Growth of High-Grade Serous Ovarian Cancer Cells. Cancers 2020 — PMC7762972.
Upregulated Histone Deacetylase 6 Associates with Malignant Progression of Melanoma and Predicts the Prognosis of Patients. Cancer management and research 2020 — PMC7751721.
PubMed PMID:10220385 — UniProt-cited evidence.
PubMed PMID:10048485 — UniProt-cited evidence.
PubMed PMID:15772651 — UniProt-cited evidence.