PDPK1 / 3-phosphoinositide-dependent protein kinase 1 · IHC design guide

Design Immunohistochemistry for PDPK1

Plan paraffin-section PDPK1 IHC around generally cytoplasmic staining, with high signal in bone marrow hematopoietic cells and cerebellar Purkinje cells (HPA tissue IHC). Start the catalog antibody at 0.5–1 μg/mL (datasheet: PB9735), and score staining by cell type (standard IHC practice).

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

Immunohistochemistry protocol sheet for PDPK1 (IHC for PDPK1): expected localisation Generally cytoplasmic tissue staining (HPA tissue IHC), antibody PB9735, validated IHC image, and IHC protocol steps — Printable **PDPK1** IHC protocol sheet — expected localisation Generally cytoplasmic tissue staining (HPA tissue IHC), antibody PB9735, controls and protocol steps. Open the full PDPK1 IHC guide →

Navigate to: Protocols Staining pattern Controls Antibodies

PDPK1 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	Generally cytoplasmic tissue staining (HPA tissue IHC)
	Staining pattern	Cytoplasmic staining in positive cells (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet PB9735)
	Positive control ⓘ	Bone marrow+4 more · see all
	Negative control ⓘ	Adipose tissue

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image PB9735)
	Caveat	Block endogenous peroxidase in hematopoietic-rich controls (HPA tissue IHC; standard IHC practice)
	Regulation	Phospho-Tyr-9 rises in diseased tissue (UniProt)
	Isoform / epitope	5 isoforms; epitope coverage needs checking (UniProt)

Section 1

Recommended PDPK1 IHC & IF Protocols

The catalog antibody protocol is followed by 3 published PDPK1 IHC protocols for paraffin sections (PMC9195017; PMC3987083; PMC4270133).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded Mouse Intestine tissue; fixative not specified (datasheet PB9735)
Fixation	Image fixative and duration unreported (datasheet PB9735); 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 PB9735)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet PB9735)
Primary antibody	Rabbit anti-PDPK1, 0.5-1μg/ml (datasheet PB9735)
Primary incubation	Overnight at 4 °C (datasheet PB9735)
Detection	Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB9735)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	PDPK1-positive staining in hematopoietic cells of bone marrow (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control.

💡Decision noteStart with citrate pH 6 heat retrieval for the catalog antibody (datasheet: PB9735); published retrieval conditions vary by antibody (PMC9195017; PMC3987083; PMC4270133).

Section 2

What Is the Expected PDPK1 Staining Pattern?

PDPK1 is generally cytoplasmic in tissue IHC, with cell membrane, focal adhesion and context-dependent nuclear localization also reported (HPA: general cytoplasmic expression; UniProt O15530: subcellular location). Expect staining in hematopoietic cells, Purkinje cells, splenic red pulp cells and late spermatids (HPA: High in each). PDPK1 has no transmembrane segment, so membrane staining represents localization rather than an integral membrane protein (UniProt O15530: topology). HPA rates its tissue IHC evidence Supported, with medium agreement between staining and RNA expression (HPA: reliability).

What am I looking at on my slide?
Cytoplasmic staining is strongest in bone marrow hematopoietic cells, cerebellar Purkinje cells, splenic red pulp cells or testicular late spermatids (HPA: High in each).	This fits the reported tissue IHC pattern (HPA: general cytoplasmic expression; High in the listed cells). Compare cells within the same section: HPA reports medium staining in bronchial respiratory epithelium and adrenal glandular cells, so uniform intensity across tissues is unnecessary (HPA: Medium in both).
Nuclear staining appears in neuronal cells, or focal adhesion or membrane staining appears in a relevant signaling context (UniProt O15530: subcellular location).	These compartments are biologically plausible: UniProt describes neuronal nuclear restriction and regulated membrane or focal adhesion localization (UniProt O15530: subcellular location). Judge the result against cell identity and context; HPA’s tissue IHC summary remains predominantly cytoplasmic (HPA: profile).
Signal outlines extracellular spaces, fills tissue-free areas or appears only as surface deposits (UniProt O15530: topology; HPA: general cytoplasmic expression).	Treat this as a likely staining artefact: PDPK1 lacks a transmembrane segment, and the supported tissue pattern is cellular (UniProt O15530: topology; HPA: profile). Genuine regulated membrane localization should track identifiable cells, not empty spaces (UniProt O15530: subcellular location).
Adipocytes stain strongly while expected positive cells do not (HPA: adipocytes Not detected; High in hematopoietic cells).	Suspect cross-reactivity or endogenous detection activity (standard IHC practice). HPA’s undetected adipocyte result is a reference pattern, not proof that every adipocyte must be negative; assess the antibody and detection controls before assigning specificity (HPA: adipocytes Not detected; reliability Supported).
The section has broad haze, or a known positive population has no visible signal (HPA: High in Purkinje cells and hematopoietic cells).	Haze limits compartment scoring; absent signal in a reported high-staining population makes a technical failure or unsuitable antibody conditions plausible (standard IHC practice; HPA: High in the listed cells). Review controls before interpreting either result as PDPK1 biology.

💡Expected PDPK1 appearanceA convincing positive shows predominantly cellular cytoplasmic staining, often strong in HPA-listed high populations; acellular deposits or broad nonspecific haze are suspect (HPA: profile and High populations; standard IHC practice).

How each factor affects the staining
Tissue and cell selection (HPA: tissue IHC).	HPA reports High staining in hematopoietic cells, Purkinje cells, red pulp cells and late spermatids, but Not detected in adipocytes; choose comparison regions by cell type rather than whole-tissue averages (HPA: listed tissue levels).
Compartment and signaling state (UniProt O15530: subcellular location).	Insulin-associated membrane translocation and context-dependent nuclear or focal adhesion localization can alter the visible distribution; a membrane or nuclear component alone does not establish antibody failure (UniProt O15530: subcellular location).
Antibody validation (HPA: antibody records).	HPA lists IHC as Supported for HPA035199 and CAB004272; HPA008062 has no IHC status listed (HPA: antibody validation). Supported tissue evidence has medium staining–RNA agreement, so controls remain useful (HPA: reliability).
Isoforms and epitope coverage (UniProt O15530: isoforms).	UniProt lists 5 isoforms; the supplied record does not map the catalog antibody’s epitope to them (UniProt O15530: isoforms; supplied evidence). An unexpected cell pattern cannot be assigned to a specific isoform from these data.
IF/ICC Q&A: where should signal appear? (HPA: subcellular ICC-IF).	Mainly in cytosol, with additional primary cilium tip localization (HPA: cytosol enhanced; cilium tip approved). This is ICC-IF evidence, so apply its compartment expectation cautiously to paraffin tissue IHC (HPA: assay-specific records).

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
No staining in a high-reference cell population (HPA: High in bone marrow hematopoietic cells).	Primary antibody, detection or retrieval conditions may be inadequate (standard IHC practice); the HPA reference pattern alone cannot identify which step failed.	Check the positive control and omitted-primary control; then review the antibody’s IHC validation and optimize one general IHC variable at a time (HPA: antibody records; standard IHC practice).
Diffuse staining obscures cell boundaries (HPA: general cytoplasmic expression).	Nonspecific primary binding or detection background may be contributing (standard IHC practice). A diffuse field cannot reliably establish PDPK1 localization.	Inspect omitted-primary and detection controls, then adjust blocking, washing or antibody concentration according to the assay setup (standard IHC practice).
Strong adipocyte signal dominates the section (HPA: adipocytes Not detected).	Cross-reactivity or endogenous detection activity is possible (standard IHC practice); HPA’s negative reference is not an absolute biological exclusion.	Check omitted-primary and relevant endogenous-activity controls, and compare with a reported high-staining cell population on a suitable section (standard IHC practice; HPA: High populations).
Nuclear signal is scored as automatically wrong (UniProt O15530: neuronal nuclear localization).	The interpretation overlooks cell context: UniProt describes neuronal nuclear restriction, while HPA summarizes tissue IHC as generally cytoplasmic (UniProt O15530: subcellular location; HPA: profile).	Identify the stained cell population and compare cytoplasmic and nuclear signal within it; use antibody and detection controls before calling the compartment artefactual (standard IHC practice).
Membrane staining is either rejected or called universally positive (UniProt O15530: regulated membrane localization).	PDPK1 can translocate to the membrane, but its tissue IHC profile is generally cytoplasmic and it has no transmembrane segment (UniProt O15530: subcellular location and topology; HPA: profile).	Score membrane signal only in identifiable cells, record its distribution, and check whether cytoplasmic signal and controls support the interpretation (HPA: profile; standard IHC practice).
A weak tissue is used as the sole negative or positive check (HPA: Low in cerebral cortex neuronal cells).	HPA reports cell-specific variation despite low tissue RNA specificity; low or undetected staining in one population cannot validate the whole run (HPA: tissue IHC and RNA specificity).	Include a reported high-staining population and a reported undetected population when available, and interpret each by its named cell type (HPA: High populations; adipocytes Not detected).

Source: UniProt O15530 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing PDPK1 staining

IHC analysis of PDPK1 using anti-PDPK1 antibody (PB9735). PDPK1 was detected in paraffin-embedded section of Mouse Intestine Tissue. 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-PDPK1 Antibody (PB9735) 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.

PB9735 · IHCIHC analysis of PDPK1 using anti-PDPK1 antibody (PB9735). PDPK1 was detected in paraffin-embedded section of Mouse Intestine Tissue. Heat me

IHC analysis of PDPK1 using anti-PDPK1 antibody (PB9735). PDPK1 was detected in paraffin-embedded section of Rat Testis Tissue. 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-PDPK1 Antibody (PB9735) 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.

PB9735 · IHCIHC analysis of PDPK1 using anti-PDPK1 antibody (PB9735). PDPK1 was detected in paraffin-embedded section of Rat Testis Tissue. Heat mediate

M01159 · IHCImmunohistochemical analysis of paraffin-embedded human kidney, using PDPK1 Antibody.

M01159 · IFImmunofluorescent analysis of PC-12 cells, using PDPK1 Antibody.

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000140992-PDPK1/tissue/cerebral+cortex#imid_17067923

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000140992-PDPK1/tissue/colon#imid_17067841

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000140992-PDPK1/tissue/liver#imid_17067850

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000140992-PDPK1/tissue/kidney#imid_17067843

HPA · ICC-IF HEK293Human Protein Atlas immunofluorescence, HEK293, antibody HPA035199; green = PDPK1, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

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

Sample controls for PDPK1 IHC & IF

🧪Run bone marrow first: hematopoietic cells should stain (HPA: High in bone marrow hematopoietic cells). Run adipose tissue as the biological comparison: adipocytes are reported as not detected (HPA: Not detected in adipocytes); HPA identifies no internal negative cell population within bone marrow, so do not presume that any particular cell type on the positive slide must be unstained.

Positive control tissue: Bone marrow (Hematopoietic cells, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show PDPK1 in HEK293, MCF-7, U2OS, SiHa, ASC52telo, RPTEC/TERT1, with annotated localisation: Cytosol (enhanced) (HPA subcellular).

Technical controls: Include a no-primary (secondary-only) control, a concentration-matched rabbit IgG isotype control (caption: rabbit primary antibody), and PDPK1-knockout tissue or a validated immunizing-peptide block as a target-specific control. Block endogenous peroxidase and assess endogenous biotin in bone marrow when using the reported biotin-based DAB detection (caption: biotinylated secondary, SABC and DAB).

⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected PB9735 tissue-IHC caption does not state the fixative (caption: fixative not stated). The caption reports citrate retrieval at pH 6 for 20 minutes on a paraffin section, but does not establish that retrieval is required or that the section was paraffin-section (caption: paraffin section and heat-mediated retrieval). The supplied evidence does not establish whether frozen sections or IF are easier; bone marrow's endogenous peroxidase can complicate chromogenic scoring, so interpret staining against the matched detection controls (caption: SABC/DAB). The selected PB9735 tissue-IHC caption documents paraffin sections, but does not specify the fixative (selected-SKU IHC image PB9735).

HPA tissue IHC evidence for PDPK1

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Supported — 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
Bone marrow	Hematopoietic cells	High	Protein (IHC)	HPA →
Cerebellum	Purkinje cells	High	Protein (IHC)	HPA →
Spleen	Cells in red pulp	High	Protein (IHC)	HPA →
Testis	Elongated or late spermatids	High	Protein (IHC)	HPA →
Adrenal gland	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 →

Section 3

Advanced PDPK1 IHC Tips

Use the catalog antibody’s paraffin-section result as the starting point, then assess PDPK1 staining by cell type and compartment.

Which antigen retrieval should I start with for PDPK1 in paraffin sections?

Start with heat-mediated antigen retrieval in citrate buffer at pH 6 for 20 minutes (datasheet PB9735). The catalog antibody’s mouse intestine image used that retrieval, followed by 10% goat serum block and 1 μg/ml primary antibody overnight at 4°C (datasheet PB9735). If staining is weak, check section adhesion, heating consistency and the positive control before changing retrieval conditions (standard IHC practice). Record any alternative buffer or heating time as a separate optimisation, because altered retrieval can change both signal and background (standard IHC practice).

How should I investigate variable PDPK1 staining between paraffin blocks?

Record the fixative, fixation duration and processing history for each block before comparing PDPK1 intensity (standard IHC practice). The selected PB9735 caption describes a paraffin section but does not state its fixative, so target-specific fixation sensitivity is unknown (datasheet PB9735). Process a known positive control alongside the study sections, using the same retrieval and detection run to reveal run-to-run variation (standard IHC practice; datasheet PB9735 retrieval). Compare staining in intact, similarly preserved regions and document any tissue damage or uneven morphology (standard IHC practice). Do not assign a fixation effect to PDPK1 without a direct comparison of differently fixed specimens (standard IHC practice).

Should PDPK1 staining be cytoplasmic, nuclear or at the cell membrane?

Assess cytoplasmic staining first: tissue IHC shows a general cytoplasmic pattern, while cell imaging places PDPK1 mainly in the cytosol (HPA: tissue IHC profile; HPA: subcellular summary). Nuclear and membrane localisation are also reported, with membrane recruitment linked to insulin stimulation and nuclear localisation linked to PTPN6 association and Ser-396 phosphorylation (UniProt O15530 localisation). Evaluate these compartments within identifiable cells instead of calling every non-cytoplasmic signal background (UniProt O15530 localisation; standard IHC practice). If membrane or nuclear staining is the endpoint, score each compartment separately and include matched controls before interpreting a shift (standard IHC practice).

Can this stain distinguish PDPK1 isoforms or phosphorylation states?

Treat the catalog antibody’s staining as total candidate PDPK1 unless its recognised epitope and modification sensitivity are established (standard IHC interpretation). The record lists 5 isoforms, a protein kinase domain at residues 82–342, and a PH domain at 459–550, but gives no antibody epitope (UniProt O15530 domains and isoforms; datasheet PB9735 caption). PDPK1 also has documented phosphorylation sites, including Ser-241 and Tyr-9, so staining intensity alone cannot identify either modified form (UniProt O15530 modified residues; standard IHC interpretation). For an isoform or phosphosite claim, require an appropriate discriminating reagent and independently validated controls (standard IHC practice).

How can IF help check the cellular source of an IHC signal?

Use IF as a separate validation experiment and multiplex PDPK1 with a marker for the expected cell type, such as a Purkinje cell marker when examining cerebellum (HPA: High in Purkinje cells; standard IF practice). Choose spectrally separated fluorophores and check unstained tissue for autofluorescence before assigning a weak signal, especially in the shorter wavelength channel (standard IF practice). PDPK1 is mainly cytosolic and has no transmembrane segment; use controlled permeabilisation when testing an intracellular epitope, while confirming the antibody’s epitope and IF suitability independently (HPA: subcellular summary; UniProt O15530 topology; standard IF practice). Compare cellular and subcellular patterns with the chromogenic section without treating the IF result as an established PB9735 IF protocol (standard assay validation practice).

What should I check when PDPK1 DAB staining is diffuse or widespread?

Begin with a section lacking primary antibody, then inspect whether colour persists in the same compartments or tissue structures (standard IHC practice). The selected protocol uses a biotinylated secondary antibody, a streptavidin–biotin complex and DAB, so check endogenous peroxidase and biotin-related signal with suitable controls (datasheet PB9735; standard IHC practice). Compare background after the documented 10% goat serum block and 1 μg/ml primary antibody condition before changing multiple variables together (datasheet PB9735; standard IHC practice). Diffuse cytoplasmic staining alone is insufficient proof of artefact because PDPK1 has a general cytoplasmic tissue pattern; use morphology and controls to decide (HPA: tissue IHC profile; standard IHC practice).

How should I quantify PDPK1 staining across tissue samples? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and compartment before scoring, then use a consistent H-score or percentage of positive cells for the chromogenic readout (standard IHC practice). If distribution matters more than intensity, report positive-cell density per mm² of viable tissue and state the threshold used (standard IHC practice). Normalise each result to the number of eligible cells or analysed viable area, and keep section thickness, retrieval, detection and image settings consistent (standard IHC practice). Report cytoplasmic and nuclear scores separately when both occur, since PDPK1 localisation can differ by cellular context (UniProt O15530 localisation; HPA: general cytoplasmic tissue profile).

When is unusual PDPK1 staining credible rather than an IHC artefact?

A credible result should localise to intact cells, recur in comparable sections and exceed the signal in a no-primary control (standard IHC practice). Cytoplasmic staining fits the general tissue profile, while strong staining in Purkinje cells, hematopoietic cells or splenic red-pulp cells has supporting tissue evidence (HPA: tissue IHC profile; HPA: High in listed cells). Nuclear or membrane staining warrants compartment-specific review because PDPK1 can occupy those locations under particular cellular conditions (UniProt O15530 localisation). Treat staining confined to section edges, necrotic areas or endogenous-enzyme control signal as suspect, and avoid interpreting compartment shifts as kinase activation from total-protein IHC alone (standard IHC practice; UniProt O15530 function).

Boster reagents

Best PDPK1 / 3-phosphoinositide-dependent protein kinase 1 IHC Antibodies

Anti-PDPK1 IHC images cover human kidney, lung cancer and placenta, mouse intestine, and rat testis (catalog IHC image alts); a PC-12 IF image is available (M01159 IF image alt).

Real IHC data

Anti-PDPK1 Antibody ®

Cat # PB9735

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Real IHC data Immunohistochemical analysis of paraffin-embedded human kidney, using PDPK1 Antibody.

Anti-PDPK1/Pdk 1 Rabbit Monoclonal Antibody

Cat # M01159

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PB9735 is shown in paraffin sections of mouse intestine, rat testis, and human lung cancer, and in a frozen human placenta section (PB9735 IHC image alts). M01159 is shown in a paraffin section of human kidney and in PC-12 cells by IF (M01159 image alts).

Which to pick: For tissue IHC, PB9735 has paraffin-section images across mouse, rat, and human samples; its captions specify citrate retrieval, 1 μg/ml primary antibody, and DAB detection (PB9735 IHC image alts). For IF/ICC, choose M01159: it is a rabbit monoclonal, lists IF/ICC, and has a PC-12 IF image (M01159 catalog and IF image alt). For cross-species work, both list human, mouse, and rat reactivity (catalog); M01159 also has a human kidney paraffin-section IHC image (M01159 IHC image alt), and neither antibody’s paraffin-section caption reports the fixative (catalog IHC image alts).

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

References

UniProt Consortium. UniProt entry O15530 (PDPK1_HUMAN, 3-phosphoinositide-dependent protein kinase 1).
Human Protein Atlas. PDPK1 tissue IHC expression (reliability: Supported).
Human Protein Atlas. PDPK1 subcellular location (ICC-IF): Mainly localized to the cytosol. In addition localized to the primary cilium tip..
Human Protein Atlas. PDPK1 antibody validation summary (3 antibodies).
Analysis of the epidermal growth factor receptor/phosphoinositide-dependent protein kinase-1 axis in tumor of the external auditory canal in response to epidermal growth factor stimulation. Laryngoscope investigative otolaryngology 2022 — PMC9195017.
Loss of PDPK1 abrogates resistance to gemcitabine in label-retaining pancreatic cancer cells. BMC cancer 2018 — PMC6069886.
Alterations of INPP4B, PIK3CA and pAkt of the PI3K pathway are associated with squamous cell carcinoma of the lung. Cancer medicine 2014 — PMC3987083.
A next-generation dual-recombinase system for time- and host-specific targeting of pancreatic cancer. Nature medicine 2014 — PMC4270133.
PubMed PMID:9094314 — UniProt-cited evidence.
PubMed PMID:9368760 — UniProt-cited evidence.
PubMed PMID:9445477 — UniProt-cited evidence.