NDFIP1 / NEDD4 family-interacting protein 1 · IHC design guide

Design Immunohistochemistry for NDFIP1

Plan chromogenic IHC for NDFIP1 in paraffin sections using the catalog antibody at a starting concentration of 5 μg/mL (datasheet). Compare cytoplasmic staining in lung macrophages with an appropriate negative control (HPA tissue IHC).

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

Immunohistochemistry protocol sheet for NDFIP1 (IHC for NDFIP1): expected localisation Cytoplasmic staining observed; endosome and Golgi membranes annotated (HPA tissue IHC; UniProt), antibody A04644, validated IHC image, and IHC protocol steps — Printable **NDFIP1** IHC protocol sheet — expected localisation Cytoplasmic staining observed; endosome and Golgi membranes annotated (HPA tissue IHC; UniProt), antibody A04644, controls and protocol steps. Open the full NDFIP1 IHC guide →

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NDFIP1 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 observed; endosome and Golgi membranes annotated (HPA tissue IHC; UniProt)
	Staining pattern	Cytoplasmic staining, including in lung macrophages (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen)
	Positive control ⓘ	Adrenal gland+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 formalin fixation consistent across paraffin sections. (standard IHC practice; not target-specific)
	Caveat	Endogenous peroxidase in lung macrophages may confound staining (HPA tissue IHC; standard IHC practice)
	Regulation	Stimulus-linked expression change not specified (UniProt)
	Isoform / epitope	2 isoforms; check epitope against membrane topology (UniProt)

Section 1

Recommended NDFIP1 IHC & IF Protocols

Compare the catalog antibody protocol with three published NDFIP1 IHC protocols for cell line arrays, substantia nigra sections, and HNSCC patient sections (PMC8320194; PMC3901732; PMC8486716).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Tissue sections; selected-image fixative not specified (standard IHC workflow)
Fixation	Image fixative and duration unreported (datasheet A04644); verify before use.
Sectioning	4–5 µm sections on charged slides (standard)
Deparaffinisation	Xylene, graded ethanol series to water (standard)
Antigen retrieval	Heat-induced epitope retrieval in citrate buffer, pH 6.0, 20 min at 95–98 °C (standard rule: cytoplasmic / membrane antigen)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% normal serum of the secondary host, 30 min, room temperature (standard)
Primary antibody	Rabbit anti-NDFIP1, 5 μg/mL (datasheet A04644)
Primary incubation	Overnight at 4 °C (standard)
Detection	HRP-polymer secondary, DAB chromogen 5–10 min (standard)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	NDFIP1-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control.

💡Decision noteStart with citrate pH 6.0 retrieval at 95–98 °C for 20 min for this membrane antigen (page antigen retrieval; UniProt Q9BT67 topology).

Section 2

What Is the Expected NDFIP1 Staining Pattern?

NDFIP1 is a three-pass membrane protein associated with endosome and Golgi membranes (UniProt Q9BT67 topology and subcellular location). In paraffin-section IHC, expect a predominantly cytoplasmic pattern, with strong staining possible in neuronal cells, lung macrophages, testicular Leydig cells, and several glandular cell populations (HPA: general cytoplasmic expression; High in those cells). Treat the pattern as a guide rather than an absolute rule: HPA rates its tissue IHC evidence Approved, with medium consistency against RNA data (HPA: reliability).

What am I looking at on my slide?
Cytoplasmic staining in cerebral cortex neurons or lung macrophages, with recognizable cell boundaries and a clean counterstain.	This fits the reported compartment and high-staining cell types (HPA: general cytoplasmic expression; High in cerebral cortex neuronal cells and lung macrophages). A granular or perinuclear accent can be compatible with endosome and Golgi membranes, but HPA does not specify either appearance for tissue IHC (UniProt Q9BT67 subcellular location; HPA: tissue profile).
Strong nuclear-only staining dominates cells while their cytoplasm is unstained.	A nuclear-only result does not match the reported general cytoplasmic tissue profile or the annotated endosome and Golgi membrane locations (HPA: tissue profile; UniProt Q9BT67 subcellular location). Check staining controls and repeat before interpreting the nuclear signal as NDFIP1; these sources do not establish nuclear-only tissue staining.
Adipocytes or cardiomyocytes stain strongly, especially when expected positive cells stain weakly.	These cell types were reported as not detected in the HPA tissue survey (HPA: Not detected in adipocytes and cardiomyocytes). Consider antibody cross-reactivity or chromogenic detection background, then compare a no-primary control and an expected positive section (general IHC practice). A discordant cell alone cannot identify the cause.
Color spreads through stroma, lumens, or empty areas instead of outlining stained cells.	Noncellular color cannot be assigned to NDFIP1 expression from the reported cellular pattern (HPA: general cytoplasmic expression). Investigate nonspecific reagent binding, residual endogenous enzyme activity, and counterstain or chromogen deposits using process controls (general chromogenic IHC practice).
No staining appears in a section containing a reported high-staining cell population.	An absent signal in an expected positive cell type makes the run inconclusive before it establishes biological absence (HPA: High in lung macrophages, cerebral cortex neurons, and testicular Leydig cells). Review the section, antibody application, retrieval, detection reagents, and positive control together (general IHC practice).

💡Expected NDFIP1 appearanceA persuasive positive is cell-associated, predominantly cytoplasmic staining in a reported high-staining population, such as lung macrophages, alongside clean surrounding tissue; nuclear-only or noncellular color is suspect (HPA: general cytoplasmic expression; High in lung macrophages; UniProt Q9BT67 subcellular location).

How each factor affects the staining
Compartment and topology	NDFIP1 has three transmembrane segments and annotated endosome and Golgi membrane locations (UniProt Q9BT67 topology and subcellular location). These support a cytoplasmic membrane-associated interpretation of the tissue pattern (HPA: general cytoplasmic expression). The supplied record does not locate the catalog antibody's epitope, so topology alone cannot prescribe retrieval conditions.
Cell-type variation	High staining is reported in selected neuronal, macrophage, Leydig, myoepithelial, respiratory epithelial, and glandular cells; other populations are low or not detected (HPA: tissue IHC). Choose controls by cell type within the section, since whole-tissue names can hide which cells supply a valid positive or negative reference (general IHC practice).
Strength of the tissue evidence	The tissue antibody is rated Approved, with medium consistency between staining and RNA expression; its IHC validation is not listed as Enhanced (HPA: reliability; HPA: HPA009682 IHC Approved). Interpret isolated, unexpected staining conservatively and compare morphology and controls before assigning it to NDFIP1 (general IHC practice).
Isoforms and extracellular detection	Two isoforms are listed, and NDFIP1 has been detected in exosomes released through an exosomal pathway (UniProt Q9BT67 isoforms and subcellular location). The payload does not establish isoform-specific tissue patterns or show that chromogenic extracellular deposits identify exosomal NDFIP1; avoid either inference from staining alone.
IF/ICC cross-check: what can it add?	HPA summarizes subcellular localization as Membrane but provides no ICC-IF image cell lines or main location (HPA: subcellular summary). That entry cannot confirm a particular punctate IF pattern or substitute for the paraffin-section IHC tissue observations; use the separate IF/ICC guide for its experimental workflow.

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
A reported high-staining population is blank.	The run may have failed, or the sampled section may lack the relevant cells; absence is not interpretable without a working positive control (HPA: High in lung macrophages and cerebral cortex neuronal cells; general IHC practice).	Confirm the cell population on the counterstained section and run an expected positive section alongside it; verify antibody application, antigen retrieval, and detection reagents against the chosen assay instructions (general IHC practice). Do not infer target-specific fixation sensitivity from this result.
Nuclei stain strongly while cytoplasm remains clear.	This conflicts with the reported general cytoplasmic tissue pattern and annotated membrane locations (HPA: tissue profile; UniProt Q9BT67 subcellular location). The observation alone does not distinguish off-target binding from detection background.	Compare a no-primary control, inspect cell morphology, and repeat with controlled reagent and detection settings (general IHC practice). Score nuclear-only color separately from the expected cytoplasmic signal until specificity is supported.
Adipocytes, cardiomyocytes, or squamous epithelium stain unexpectedly.	HPA reports no detection in adipocytes, cardiomyocytes, and esophageal or vaginal squamous epithelial cells (HPA: tissue IHC). Strong staining there is discordant, although HPA's Approved rating does not make every individual cell an absolute negative (HPA: reliability).	Compare a no-primary control and a high-staining cell population in the same run; assess morphology and whether the signal remains cell-associated (general IHC practice). Record a persistent discordance instead of treating it as established NDFIP1 expression.
Broad brown haze obscures cell boundaries.	Diffuse color is difficult to reconcile with the reported cellular cytoplasmic profile (HPA: tissue profile). Nonspecific reagent binding or residual endogenous peroxidase can contribute to chromogenic background (general IHC practice).	Use a no-primary control, verify the blocking and endogenous-enzyme steps appropriate to the detection system, and adjust development to preserve cell boundaries (general chromogenic IHC practice). Reassess intensity only after background is controlled.
Only a few cells stain in a tissue described as NDFIP1 positive.	Expression is cell-type dependent: HPA names specific high-staining cells rather than uniformly high staining across each tissue (HPA: tissue IHC). Its overall profile is general cytoplasmic expression with low tissue specificity at the RNA level (HPA: tissue profile and RNA specificity).	Identify the reported cell population on the section and score it separately from neighboring cells (general IHC practice). Compare with a matched positive control before increasing antibody concentration or calling the tissue negative.
IF/ICC shows a membrane signal that differs from the paraffin-section pattern.	HPA's IF entry says Membrane but supplies no ICC-IF image cell lines or detailed main location; its tissue IHC entry reports general cytoplasmic expression (HPA: subcellular summary; HPA: tissue profile). The two entries do not establish identical appearances across applications.	Evaluate the IHC section against its own cell-type and cytoplasmic references, and assess IF/ICC in its separate guide with application-specific controls (HPA: tissue IHC and subcellular summary; general assay practice). Do not change the IHC interpretation solely to match an unsupported detailed IF pattern.

Source: UniProt Q9BT67 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing NDFIP1 staining

A04644 · IHCImmunohistochemistry of NDFIP1 in human lung tissue with NDFIP1 antibody at 5 μg/ml.

A04644 · IFImmunofluorescence of NDFIP1 in human lung tissue with NDFIP1 antibody at 20 μg/ml.

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000131507-NDFIP1/tissue/cerebral+cortex#imid_2784144

HPA · Adrenal glandHuman Protein Atlas IHC, Adrenal gland. Source: https://www.proteinatlas.org/ENSG00000131507-NDFIP1/tissue/adrenal+gland#imid_2784128

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000131507-NDFIP1/tissue/colon#imid_2784078

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000131507-NDFIP1/tissue/liver#imid_2784079

← swipe / scroll for more images →

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

Sample controls for NDFIP1 IHC & IF

🧪Run lung first: macrophages must stain strongly (HPA: High in lung macrophages; A04644 tissue-IHC caption: human lung). Use adipose tissue as a negative comparator, focusing on adipocytes (HPA: Not detected in adipocytes); on the lung slide, use any unstained neighboring cells only as a background reference, since their NDFIP1 status is unreported.

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

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA carries no ICC-IF cell line for NDFIP1; derive a cell-line control from the positive tissue's cell type (Glandular cells) and confirm it by RNA or western blot first.

Technical controls: Include a no-primary (secondary-only) control, host-matched nonimmune IgG or subclass-matched isotype control as appropriate, and an NDFIP1 knockout specimen or validated peptide-block control (standard IHC practice). In lung, block endogenous peroxidase for chromogenic detection and assess macrophage pigment as a possible staining artefact; for IF, check autofluorescence with a no-primary control (standard IHC/IF practice).

⚠️Feasibility: The A04644 human-lung tissue-IHC caption reports 5 μg/ml antibody but does not report a fixative (A04644 tissue-IHC caption). A target-specific fixation window and the effect or required conditions of antigen retrieval are unreported in the supplied evidence; optimize retrieval empirically for paraffin sections (standard IHC practice). The supplied evidence does not establish whether frozen sections or IF are easier; lung macrophage pigment may complicate chromogenic scoring, and autofluorescence may complicate IF (standard IHC/IF practice).

HPA tissue IHC evidence for NDFIP1

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — 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
Adrenal gland	Glandular cells	High	Protein (IHC)	HPA →
Breast	Myoepithelial cells	High	Protein (IHC)	HPA →
Cerebral cortex	Neuronal cells	High	Protein (IHC)	HPA →
Gallbladder	Glandular cells	High	Protein (IHC)	HPA →
Lung	Macrophages	High	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 →
Smooth muscle	Smooth muscle cells	Not detected	Protein (IHC)	HPA →
Spleen	Cells in red pulp	Not detected	Protein (IHC)	HPA →

Section 3

Advanced NDFIP1 IHC Tips

Troubleshoot NDFIP1 chromogenic IHC in paraffin sections using the reported tissue staining, protein topology, and matched controls.

How should I retrieve NDFIP1 in paraffin sections when staining is weak?

Start with citrate pH 6.0 heat-induced epitope retrieval at 95–98 °C for 20 min (page retrieval rule: cytoplasmic / membrane antigen). Keep section thickness, cooling, antibody incubation, and detection conditions identical across a small retrieval comparison so that a gain in signal can be attributed to retrieval (standard IHC practice). Compare staining in lung macrophages or cerebral cortical neurons, both reported as high, with a no-primary control (HPA: High in lung macrophages and cerebral cortical neuronal cells). If staining remains weak, test an alternative retrieval condition on adjacent sections and retain it only if cellular signal improves without increased diffuse or edge staining (standard IHC practice).

Could fixation explain weak or uneven NDFIP1 staining?

Target-specific sensitivity of NDFIP1 to fixation is unknown because no fixation comparison is supplied, and the selected lung IHC caption does not state its fixative (selected A04644 tissue-IHC caption: fixative not stated). Record the fixative, time in fixative, processing schedule, and section age for each specimen before attributing a staining difference to biology (standard IHC practice). Compare similarly processed sections at 4 µm thickness in one staining run, with the same citrate pH 6.0 retrieval for 20 min (page retrieval rule; standard IHC practice). If signal differs by processing batch, repeat with matched controls before changing the primary antibody concentration (standard IHC practice).

What staining pattern should I expect for NDFIP1?

Expect predominantly cytoplasmic staining at the light-microscope level, while allowing for punctate or perinuclear signal consistent with endosome and Golgi membranes (HPA: general cytoplasmic expression; UniProt Q9BT67: endosome and Golgi membrane). NDFIP1 also has synaptosome and dendrite annotations, so assess neuronal processes separately from neuronal cell bodies in cerebral cortex (UniProt Q9BT67: synaptosome and dendrite; HPA: High in cerebral cortical neuronal cells). Its 3 transmembrane segments support a membrane-associated interpretation, but chromogenic IHC alone cannot assign individual puncta to an organelle (UniProt Q9BT67 topology; standard IHC practice). Compare the pattern against adjacent morphology and a no-primary section before calling diffuse nuclear or extracellular brown deposits specific (standard IHC practice).

How can epitope position and isoforms affect NDFIP1 IHC?

Check the antibody's stated immunogen or epitope against both annotated NDFIP1 isoforms before interpreting a negative section; the supplied record lists isoforms 1 and 2 without their sequence differences (UniProt Q9BT67: isoforms 1 and 2). Topology places residues 2–116 and 165–172 on the cytoplasmic side, with short external regions at 138–143 and 194–221 (UniProt Q9BT67 topology). Retrieval may expose these regions differently in paraffin sections, so compare staining under the specified citrate pH 6.0 condition before changing interpretation (page retrieval rule; standard IHC practice). Do not assign an isoform from chromogenic staining unless the antibody's epitope and isoform coverage have been established (standard IHC practice).

How should I check an NDFIP1 IHC pattern with multiplex IF?

Use IF as a complementary localisation check, pairing NDFIP1 with a macrophage marker when investigating the reported lung macrophage signal or a neuronal marker for cerebral cortex (HPA: High in lung macrophages and cerebral cortical neuronal cells; standard IF practice). Choose spectrally separated fluorophores and inspect unstained tissue before assigning a channel, because tissue autofluorescence can mimic a weak punctate signal (standard IF practice). For an antibody targeting a cytoplasmic epitope, include permeabilisation; for an externally exposed epitope, first assess whether permeabilisation is needed (UniProt Q9BT67 topology; standard IF practice). Map the antibody epitope before selecting that treatment, and use single-stain and no-primary controls to evaluate overlap (standard IF practice).

What should I change when brown NDFIP1 signal appears everywhere?

First compare a no-primary section and the reported positive cell populations to distinguish detection background from cellular staining (standard IHC practice; HPA: High in lung macrophages and cerebral cortical neuronal cells). Quench endogenous peroxidase before chromogen development and check whether the same brown deposits persist without primary antibody; this is a general chromogenic IHC control, not NDFIP1-specific evidence (standard IHC practice). Titrate the primary antibody and shorten chromogen development while keeping citrate pH 6.0 retrieval at 95–98 °C for 20 min fixed during that comparison (page retrieval rule; standard IHC practice). The selected lung image reports 5 µg/ml, which is a documented image condition rather than a universal working concentration (selected A04644 tissue-IHC caption).

How can I quantify NDFIP1 without confusing cell composition with expression? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and compartment before scoring, since the tissue profile includes high lung macrophage staining and general cytoplasmic expression (HPA: High in lung macrophages; HPA: general cytoplasmic expression). Report either an H-score from staining intensity and percentage of positive cells, or positive-cell density per mm², using the same threshold across compared sections (standard IHC practice). Normalise positive counts to the number of eligible cells or sampled tissue area, and report macrophage fraction separately when comparing lung specimens (standard IHC practice; HPA: High in lung macrophages). Exclude folds, necrosis, and section edges by a prespecified rule, then score matched processing batches with the same detection settings (standard IHC practice).

Which findings support true NDFIP1 staining rather than an artefact?

Give greater weight to reproducible cytoplasmic or membrane-associated staining in expected cells, including lung macrophages and cerebral cortical neurons (HPA: general cytoplasmic expression; HPA: High in lung macrophages and cerebral cortical neuronal cells; UniProt Q9BT67: endosome and Golgi membrane). Treat isolated nuclear-only staining cautiously because the supplied localisation annotations do not place NDFIP1 primarily in the nucleus (UniProt Q9BT67: subcellular locations). Check whether apparent positives cluster at section edges or necrotic areas, and whether brown product also appears in the no-primary control after peroxidase detection (standard IHC practice). Interpret a negative cell population against its own morphology and controls; adipocytes and cardiomyocytes are reported as not detected in the tissue profile (HPA: adipocytes and cardiomyocytes Not detected).

Boster reagents

Best NDFIP1 / NEDD4 family-interacting protein 1 IHC Antibodies

A04644 has IHC and IF images from human lung tissue (catalog image captions) and lists Human and Mouse reactivity (catalog: reactivity).

Real IHC data Immunohistochemistry of NDFIP1 in human lung tissue with NDFIP1 antibody at 5 μg/ml.

Anti-NDFIP1 Antibody

Cat # A04644

View product →

A04644 has a human lung tissue IHC image at 5 μg/mL (catalog IHC image caption). Its IF image shows human lung tissue at 20 μg/mL (catalog IF image caption).

Which to pick: Choose A04644 for paraffin section IHC: IHC-P is listed, and its own IHC image shows human lung tissue at 5 μg/mL; the fixative is unreported (catalog: applications; catalog IHC image caption). For IF, A04644 has a human lung tissue image at 20 μg/mL; ICC validation is unreported (catalog: applications; catalog IF image caption). For cross-species work, A04644 lists Human and Mouse reactivity, although the supplied images show human tissue only; clonality is unreported.

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

References

UniProt Consortium. UniProt entry Q9BT67 (NFIP1_HUMAN, NEDD4 family-interacting protein 1).
Human Protein Atlas. NDFIP1 tissue IHC expression (reliability: Approved).
Human Protein Atlas. NDFIP1 subcellular location (ICC-IF): Membrane.
Human Protein Atlas. NDFIP1 antibody validation summary (1 antibodies).
Cancer cell line microarray as a novel screening method for identification of radioresistance biomarkers in head and neck squamous cell carcinoma. BMC cancer 2021 — PMC8320194.
Increased Ndfip1 in the substantia nigra of Parkinsonian brains is associated with elevated iron levels. PloS one 2014 — PMC3901732.
NDFIP allows NEDD4/NEDD4L-induced AQP2 ubiquitination and degradation. PloS one 2017 — PMC5606929.
Evaluation of prognostic biomarkers in a population-validated Finnish HNSCC patient cohort. European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery 2021 — PMC8486716.
PubMed PMID:12761501 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:16303743 — UniProt-cited evidence.