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HINT1 / Adenosine 5'-monophosphoramidase HINT1 · IHC design guide
Design Immunohistochemistry for HINT1
Plan chromogenic HINT1 IHC on paraffin sections using kidney tubules as a high-staining reference (HPA tissue IHC). This guide covers fixation, detection and scoring of predominantly cytoplasmic staining with occasional nuclear signal (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
HINT1 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 | Predominantly cytoplasmic, with occasional nuclear staining (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic, occasionally nuclear; kidney tubule cells stain strongly (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet PB9632) | |
| Positive control | Epididymis+4 more · see all | |
| Negative control | Heart muscle+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation conditions consistent across sections. (standard IHC practice; not target-specific) | |
| Caveat | Staining varies by cell type; kidney tubules are high, myocytes undetected (HPA tissue IHC) | |
| Regulation | Widely expressed; no inducer specified (UniProt) | |
| Isoform / epitope | No isoforms reported; the mature chain spans residues 2–126 (UniProt) |
Section 1
Recommended HINT1 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol (datasheet PB9632) with three published HINT1 chromogenic IHC methods (PMC3522093; PMC7922225; PMC11850129).
| Sample | Paraffin-embedded rat kidney tissue; fixative not specified (datasheet PB9632) |
| Fixation | Image fixative and duration unreported (datasheet PB9632); 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 PB9632); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet PB9632) |
| Primary antibody | Rabbit anti-HINT1, 0.5-1μg/ml (datasheet PB9632) |
| Primary incubation | Overnight at 4 °C (datasheet PB9632) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB9632) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | HINT1-positive staining in glandular cells of epididymis (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic and occasional nuclear expression. No signal in the no-primary control. |
💡Decision noteStart with EDTA pH 8.0 heat retrieval for the catalog antibody (datasheet PB9632). Citrate pH 6.0 microwave retrieval is reported for HCC sections (PMC3522093).
Section 2
What Is the Expected HINT1 Staining Pattern?
HINT1 is a cytoplasmic and nuclear protein with no transmembrane segment (UniProt P49773: subcellular location and topology). In paraffin-section IHC, expect mainly cytoplasmic staining with occasional nuclear staining (HPA: tissue IHC profile). Strong staining is reported in kidney tubule cells and several glandular or reproductive cell populations (HPA: tissue IHC). The HPA antibody is Approved, with medium consistency between staining and RNA data (HPA: tissue IHC reliability).
| Strong cytoplasmic staining in kidney tubule cells, with occasional nuclear staining. | This fits the reported high kidney tubule signal and general cytoplasmic, occasional nuclear profile (HPA: tissue IHC). Score the stained cells and compartments separately so a small nuclear component is not mistaken for a different pattern. |
| Predominantly nuclear or sharply membrane-only staining across the section. | Predominantly nuclear staining departs from the tissue IHC profile (HPA: general cytoplasmic and occasional nuclear expression). Membrane-only staining also needs scrutiny: the IF plasma membrane assignment is uncertain, while cytosol is supported (HPA: subcellular ICC-IF). |
| Strong staining confined to alveolar cells, cardiomyocytes, or myocytes. | These cell types are listed as not detected in the sampled tissues (HPA: lung, heart muscle, skeletal muscle). Treat an isolated strong result as possible nonspecific antibody staining or endogenous detection activity; check controls before calling it HINT1. |
| Uniform haze covers cells and surrounding tissue, obscuring their boundaries. | A haze that cannot be assigned to cytoplasm or occasional nuclei is difficult to reconcile with the reported cellular pattern (HPA: tissue IHC profile). Background from blocking, detection, or washing is a general IHC possibility (standard IHC practice). |
| No staining appears in the kidney tubule cells used as a positive control. | Kidney tubule cells have a reported high staining level (HPA: tissue IHC). An absent control signal leaves the assay uninterpretable; review section quality, retrieval, primary antibody application, and detection as general IHC checks (standard IHC practice). |
💡Expected HINT1 appearanceCall a result positive when identifiable cells show mainly cytoplasmic staining, such as high signal in kidney tubule cells, with occasional nuclear signal; widespread haze or strong staining confined to HPA not-detected cell types warrants a false-positive check (HPA: tissue IHC profile and cell-specific levels).
| Compartment and topology | Cytoplasm and nucleus are annotated locations, and HINT1 has no transmembrane segment (UniProt P49773: subcellular location and topology). Read chromogenic signal against cell boundaries and nuclei; a membrane rim alone does not establish the expected tissue IHC pattern (HPA: tissue IHC profile). |
| Cell-specific signal | The reported levels are high in kidney tubule cells and medium in stomach glandular cells, but not detected in lung alveolar cells (HPA: tissue IHC). Compare the same cell type when judging controls; a whole-tissue label can conceal differences between cells. |
| Strength of the IHC reference | The listed antibody HPA044577 is Approved for IHC, and HPA describes medium consistency between antibody staining and RNA expression data (HPA: antibody validation and tissue IHC reliability). Use the reference as a pattern guide, and interpret unexpected staining with controls. |
| IF/ICC Q&A: Should a membrane signal be expected in IHC? | IF/ICC reports supported cytosol and nucleoplasm locations, plus an uncertain plasma membrane location (HPA: subcellular ICC-IF). The tissue IHC profile reports general cytoplasmic and occasional nuclear expression (HPA: tissue IHC); assess an IHC membrane rim against that profile. |
| Situation | Likely cause | Next action |
|---|---|---|
| Kidney tubule control is blank. | A high-staining control is expected in these cells (HPA: kidney tissue IHC); the failed signal may reflect a workflow problem (standard IHC practice). | Check that the section contains tubules, then review retrieval, primary antibody application, detection reagents, and the run control (standard IHC practice). |
| All compartments show a uniform brown haze. | The haze obscures the reported cytoplasmic and occasional nuclear pattern (HPA: tissue IHC); nonspecific staining or detection background is possible (standard IHC practice). | Inspect the no-primary control, blocking and wash steps, and chromogen development before assigning cellular staining (standard IHC practice). |
| Strong staining appears only in HPA not-detected cells. | Alveolar cells, cardiomyocytes, and myocytes are reported as not detected (HPA: tissue IHC); the result may reflect cross-reactivity or endogenous detection activity (standard IHC practice). | Compare a high-staining control and the no-primary control on the same run; confirm the signal's cell type and compartment (HPA: tissue IHC; standard IHC practice). |
| Nuclei stain strongly throughout, with little cytoplasmic signal. | The balance differs from the general cytoplasmic, occasional nuclear tissue pattern (HPA: tissue IHC), although nuclear localization is recognized (UniProt P49773: subcellular location). | Compare cytoplasm and nuclei in a kidney tubule control, then review background and scoring before interpreting a compartment shift (HPA: kidney tissue IHC; standard IHC practice). |
| A low-staining cell population looks negative. | Some populations, including hippocampal neuronal cells and prostate glandular cells, have low reported staining (HPA: tissue IHC). | Verify performance with a high-staining cell population before treating weak or absent signal in those cells as a failed run (HPA: tissue IHC; standard IHC practice). |
| A sharp membrane rim dominates the IHC result. | The plasma membrane IF assignment is uncertain, while the tissue IHC profile is generally cytoplasmic with occasional nuclear staining (HPA: subcellular ICC-IF and tissue IHC). | Review the rim against cell boundaries, a high-staining control, and the no-primary control before assigning it to HINT1 (HPA: tissue IHC; standard IHC practice). |
Experiment evidence
IHC & IF images showing HINT1 staining
PB9632 · IHCIHC analysis of HINT1 using anti-HINT1 antibody (PB9632). HINT1 was detected in a paraffin-embedded section of rat kidney tissue. Heat media
PB9632 · IHCIHC analysis of HINT1 using anti-HINT1 antibody (PB9632). HINT1 was detected in a paraffin-embedded section of human intestinal cancer tissu
PB9632 · IFIF analysis of HINT1 using anti-HINT1 antibody (PB9632). HINT1 was detected in immunocytochemical section of A431 cells. Enzyme antigen retr
M02557 · IHCM02557 staining HINT1 in human kidney sections by Immunohistochemistry (IHC-P -paraformaldehyde-fixed, paraffin-embedded sections). Tissue w
M02557 · IFImmunofluorescent analysis of 4% paraformaldehyde-fixed, 0.1% Triton X-100 permeabilized U-2 OS (human bone osteosarcoma cell line) cells la
A02557 · IFImmunocytochemistry of HINT1 in Jurkat cells with HINT1 antibody at 2.5 μg/mL.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000169567-HINT1/tissue/cerebral+cortex#imid_11949785
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000169567-HINT1/tissue/colon#imid_11907833
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000169567-HINT1/tissue/liver#imid_11907842
HPA · PancreasHuman Protein Atlas IHC, Pancreas. Source: https://www.proteinatlas.org/ENSG00000169567-HINT1/tissue/pancreas#imid_11907793
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA044577; green = HINT1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA044577; green = HINT1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for HINT1 IHC & IF
🧪Run kidney first; cells in tubules should stain (HPA: High in kidney cells in tubules). Use heart muscle cardiomyocytes as the negative tissue (HPA: Not detected in cardiomyocytes). On the kidney slide, assess nontubular cells for weak or absent staining relative to tubules, without treating them as validated negative cells (HPA: High is reported for cells in tubules).
Positive control tissue: Epididymis (Glandular cells, HPA High)
Negative control tissue: Heart muscle (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show HINT1 in A-431, U-251MG, U2OS, KOLF2.1J, with annotated localisation: Plasma membrane (uncertain), Cytosol (supported) (HPA subcellular).
Technical controls: Include a no-primary control, a secondary-only control, a clonality-matched rabbit IgG isotype control where the primary's clonality is known, and HINT1 knockout material or a peptide-blocked primary as a biological specificity control (caption: rabbit anti-HINT1 primary; standard IHC practice). Block endogenous peroxidase and assess endogenous biotin in kidney when using the caption's biotin–streptavidin/DAB detection system (caption: rat kidney and SABC/DAB detection; standard IHC practice).
⚠️Feasibility: A target-specific fixation window and fixation effect are unreported, and the selected PB9632 paraffin-section caption does not state a fixative (caption: fixative unreported). The caption uses heat retrieval in EDTA at pH 8.0, but it does not establish that retrieval is required (caption: EDTA retrieval). Frozen sections have no comparative evidence here; HPA ICC-IF images support cellular IF imaging but do not show it is easier than tissue IHC (HPA: ICC-IF images in A-431, U-251MG, U2OS and KOLF2.1J).
HPA tissue IHC evidence for HINT1
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 |
|---|---|---|---|---|
| Epididymis | Glandular cells | High | Protein (IHC) | HPA → |
| Fallopian tube | Ciliated cells (cell body) | High | Protein (IHC) | HPA → |
| Gallbladder | Glandular cells | High | Protein (IHC) | HPA → |
| Kidney | Cells in tubules | High | Protein (IHC) | HPA → |
| Ovary | Follicle cells | High | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Heart muscle | Cardiomyocytes | Not detected | Protein (IHC) | HPA → |
| Lung | Alveolar cells | Not detected | Protein (IHC) | HPA → |
| Placenta | Trophoblastic 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 HINT1 IHC Tips
Use the catalog antibody’s paraffin-section evidence as a starting point, then judge HINT1 staining by cell type, compartment and appropriate controls.
Which antigen retrieval should I start with for HINT1 paraffin sections?
Start with heat-mediated retrieval in EDTA at pH 8.0 (datasheet PB9632). That condition preceded HINT1 detection in a paraffin-embedded rat kidney section, although the caption does not report the heating time or fixative (datasheet PB9632). If staining is weak, compare a controlled range of heating times on adjacent sections before trying citrate at pH 6.0 as a fallback; keep antibody concentration and detection constant during that comparison (standard IHC practice). Include a no-primary control and inspect kidney tubule cells, which show high HINT1 staining in the tissue atlas (HPA: kidney tubule cells, High), while checking that stronger retrieval has not increased diffuse background.
How should I assess whether fixation is limiting HINT1 staining?
Target-specific HINT1 sensitivity to fixation is unknown: the catalog image identifies a paraffin-embedded section but does not state its fixative (datasheet PB9632). Record the fixative, fixation duration and tissue thickness for each specimen, then compare adjacent sections processed with the same EDTA pH 8.0 retrieval and antibody concentration (datasheet PB9632; standard IHC practice). Use the catalog starting concentration of 1 μg/ml and its overnight incubation at 4°C when establishing a baseline (datasheet PB9632). If specimens differ, interpret intensity cautiously and check whether kidney tubule staining remains cellular rather than treating a staining difference as proof of a HINT1-specific fixation effect (HPA: kidney tubule cells, High; standard IHC practice).
Should HINT1 stain the cytoplasm, nucleus or cell membrane?
Expect predominantly cytoplasmic staining with occasional nuclear staining in tissue sections (HPA: tissue IHC profile); UniProt also places HINT1 in the cytoplasm and nucleus (UniProt P49773: subcellular location). Nuclear enrichment can be biologically plausible because interaction with CDK7 is linked to more nuclear localization (UniProt P49773: subcellular location). The subcellular atlas supports cytosol and nucleoplasm signals, but labels its plasma membrane assignment uncertain (HPA: subcellular location). Judge compartmental patterns within identifiable cells, using the no-primary control to assess staining that follows tissue edges or outlines every cell uniformly (standard IHC practice); HINT1 has no annotated transmembrane segment (UniProt P49773: topology).
Could HINT1 isoforms or epitope masking explain uneven staining?
No alternative isoforms are listed for HINT1, so an apparent compartment-specific pattern cannot be assigned to a documented isoform from this record (UniProt P49773: isoforms). The protein is 126 amino acids long and has an annotated HIT domain spanning residues 18–126 (UniProt P49773: length and domains). Acetylation and phosphorylation sites are annotated, but the catalog caption does not identify the antibody epitope; do not attribute weak staining to a particular modification (UniProt P49773: modified residues; datasheet PB9632). Compare EDTA pH 8.0 retrieval and antibody titrations on adjacent sections, then use an independent epitope reagent or an appropriate loss-of-target control if epitope specificity remains in doubt (datasheet PB9632; standard IHC practice).
How can I cross-check the IHC pattern with multiplex IF?
Use IF/ICC as an orthogonal localization check, and pair HINT1 with a marker identifying the expected cell population, such as kidney tubule cells in a kidney comparison (HPA: kidney tubule cells, High; standard IF practice). Choose spectrally separated fluorophores and favor a longer-wavelength HINT1 channel if the specimen has strong short-wavelength autofluorescence; inspect single-channel and no-primary controls before interpreting overlap (standard IF practice). HINT1 has no transmembrane segment and has supported cytosolic and nucleoplasmic locations, so permeabilisation must allow access to intracellular epitopes; the catalog caption does not identify its precise epitope (UniProt P49773: topology; HPA: subcellular location; datasheet PB9632). Compare cell identity and compartmental pattern with chromogenic IHC, without assuming that the paraffin-section result establishes IF performance (datasheet PB9632; standard IF practice).
What should I check when HINT1 DAB staining looks diffuse?
First compare a no-primary section with the test section and inspect whether DAB deposit follows tissue folds, cut edges or damaged areas rather than cell outlines (standard IHC practice). The catalog image used 10% goat serum blocking, biotinylated goat anti-rabbit secondary antibody, an avidin–biotin detection complex and DAB (datasheet PB9632). Include a peroxidase block and, if background persists, assess detection-system background with appropriate reagent controls; these are general chromogenic IHC checks, not demonstrated HINT1-specific requirements (standard IHC practice). Reduce antibody concentration or detection development in controlled steps while checking that kidney tubule staining remains discernible (HPA: kidney tubule cells, High; standard IHC practice).
How should I quantify HINT1 staining across tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring: HINT1 tissue staining is generally cytoplasmic with occasional nuclear expression (HPA: tissue IHC profile). For each region, record the percentage of positive cells and an H-score using intensity categories 0–3, or measure positive-cell density per mm² when cell counts suit the question (standard IHC practice). Normalize positive cells to all evaluable cells of the same type, or area measurements to evaluable tissue area, excluding folds and necrosis consistently (standard IHC practice). Keep retrieval, antibody incubation, DAB development and image settings matched across specimens, and report cytoplasmic and nuclear scores separately if their balance changes (datasheet PB9632; standard IHC practice).
How do I distinguish true HINT1 staining from artefact?
A credible HINT1 pattern follows identifiable cells and is mainly cytoplasmic with occasional nuclear signal (HPA: tissue IHC profile); supported cytosolic and nucleoplasmic locations provide a second compartment check (HPA: subcellular location). High staining in kidney tubule cells is a useful positive reference, while alveolar cells are listed as not detected; neither designation replaces controls for the specimen being tested (HPA: kidney tubule cells, High; HPA: lung alveolar cells, Not detected). Treat staining confined to edges or necrosis, uniform signal in an unexpected compartment, or DAB present on a no-primary section as suspicious (standard IHC practice). Check endogenous peroxidase and detection-system background before attributing a new pattern to HINT1 biology (standard IHC practice).
Boster reagents
Best HINT1 / Adenosine 5'-monophosphoramidase HINT1 IHC Antibodies
Anti-HINT1 antibodies have IHC images from paraffin sections of rat and human kidney and an ICC image from Jurkat cells (PB9632 image caption; M02557 image caption; A02557 image caption).
Real IHC data
Anti-HINT1 Antibody ®
Cat # PB9632
Real IHC data
Anti-HINT1 Antibody
Cat # M02557
Real IF data
Anti-HINT1 Antibody
Cat # A02557
PB9632 has IHC images from rat kidney, human intestinal cancer, and mouse intestine; M02557 has IHC-P data from human kidney and IF data from U-2 OS cells (PB9632 image captions; M02557 image captions). A02557 has ICC data from Jurkat cells at 2.5 μg/mL (A02557 image caption).
Which to pick: For tissue IHC, choose PB9632 for paraffin sections across the three imaged species, or mouse monoclonal M02557 when a paraffin-section human kidney example fits the study; PB9632’s fixative is unreported (PB9632 image captions; M02557 image caption; M02557 catalog clone). For IF in cells, M02557 has a U-2 OS image; for ICC, A02557 has a Jurkat image (M02557 IF image caption; A02557 ICC image caption). For cross-species IHC, PB9632 has image examples in human, mouse, and rat tissue at 0.5–1 μg/mL (PB9632 image captions; PB9632 catalog dilution). The selected PB9632 tissue-IHC caption documents paraffin sections, but does not specify the fixative (selected-SKU IHC image PB9632).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P49773 (HINT1_HUMAN, Adenosine 5'-monophosphoramidase HINT1).
- Human Protein Atlas. HINT1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. HINT1 subcellular location (ICC-IF): Mainly localized to the plasma membrane and cytosol. In addition localized to the nucleoplasm..
- Human Protein Atlas. HINT1 antibody validation summary (1 antibodies).
- Silencing of Hint1, a novel tumor suppressor gene, by promoter hypermethylation in hepatocellular carcinoma. Cancer letters 2009 — PMC3522093.
- Comparative Proteomic Study Shows the Expression of Hint-1 in Pituitary Adenomas. Diagnostics (Basel, Switzerland) 2021 — PMC7922225.
- Genetic Fine Mapping and Genomic Annotation Defines Causal Mechanisms at A Novel Colorectal Cancer Susceptibility Locus in Han Chinese. Journal of Cancer 2020 — PMC7592009.
- HINT1 suppression protects against age-related cardiac dysfunction by enhancing mitochondrial biogenesis. Molecular metabolism 2025 — PMC11850129.
- PubMed PMID:8812426 — UniProt-cited evidence.
- PubMed PMID:7644499 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for HINT1 (Adenosine 5'-monophosphoramidase HINT1). Expected localisation Predominantly cytoplasmic, with occasional nuclear staining (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet PB9632). Validated IHC antibody: PB9632 at 0.5-1μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Epididymis (Glandular cells); negative Heart muscle. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded rat kidney tissue; fixative not specified (datasheet PB9632); 2. Fixation: Image fixative and duration unreported (datasheet PB9632); verify before use.; 3. Sectioning: 4–5 µm sections on charged slides (standard); 4. Deparaffinisation: Xylene, graded ethanol series to water (standard); 5. Antigen retrieval: Heat retrieval: EDTA pH 8.0 (datasheet PB9632); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet PB9632); 8. Primary antibody: Rabbit anti-HINT1, 0.5-1μg/ml (datasheet PB9632); 9. Primary incubation: Overnight at 4 °C (datasheet PB9632). Watch for: Fixation: Keep fixation conditions consistent across sections. (standard IHC practice; not target-specific); Caveat: Staining varies by cell type; kidney tubules are high, myocytes undetected (HPA tissue IHC); Isoform / epitope: No isoforms reported; the mature chain spans residues 2–126 (UniProt); Regulation: Widely expressed; no inducer specified (UniProt). Evidence: UniProt P49773, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the plasma membrane and cytosol. In addition…, Datasheet PB9632, PMC3522093, PMC7922225. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/HINT1/immunohistochemistry-ihc-guide.