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KISS1R / KiSS-1 receptor · IHC design guide
Design Immunohistochemistry for KISS1R
Plan paraffin-section KISS1R staining around the reported cytoplasmic tissue pattern and high placental trophoblast staining (HPA tissue IHC). Use the IHC-validated antibody at 1–2 μg/ml (datasheet A01364-2), and compare staining across consistently fixed sections (standard IHC practice).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
KISS1R 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); membrane annotated (UniProt) | |
| Staining pattern | Cytoplasmic staining; high in placental trophoblasts (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A01364-2) | |
| 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 fixation consistent across sections. (standard IHC practice; not target-specific) | |
| Caveat | Antibody staining has low consistency with RNA data (HPA tissue IHC) | |
| Regulation | Higher in first-trimester trophoblasts (UniProt) | |
| Isoform / epitope | No isoforms annotated; extracellular and cytoplasmic regions differ (UniProt) |
Section 1
Recommended KISS1R IHC & IF Protocols
The catalog antibody uses heat-mediated EDTA retrieval at pH 8.0 (datasheet A01364-2). Three published KISS1R IHC protocols provide additional conditions (PMC3284150; PMC6433948; PMC8871750).
| Sample | Paraffin-embedded human gall bladder adenosquamous carcinoma tissue; fixative not specified (datasheet A01364-2) |
| Fixation | Image fixative and duration unreported (datasheet A01364-2); 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 A01364-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A01364-2) |
| Primary antibody | Rabbit anti-KISS1R, 1-2 μg/ml (datasheet A01364-2) |
| Primary incubation | Overnight at 4 °C (datasheet A01364-2) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A01364-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | KISS1R-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several tissues, including hypothalamus. No signal in the no-primary control. |
💡Decision noteStart with EDTA at pH 8.0 for the catalog antibody (datasheet A01364-2); consider citrate at pH 6.0 when adapting the published protocols (PMC3284150; PMC6433948).
Section 2
What Is the Expected KISS1R Staining Pattern?
KISS1R is a 7-pass cell-membrane receptor (UniProt Q969F8 topology). In paraffin-section IHC, expect staining in placental trophoblasts, hippocampal neurons and testicular Leydig cells (HPA: High in each). HPA describes tissue staining as cytoplasmic, while its ICC-IF data support a mainly plasma-membrane location with additional vesicles (HPA tissue IHC; HPA ICC-IF). The tissue IHC assessment is Approved, with low consistency between staining and RNA expression (HPA reliability).
| Placental trophoblasts, hippocampal neurons or Leydig cells stain more strongly than nearby unstained cells. | These are useful positive-cell landmarks because HPA reports High IHC staining in each (HPA tissue IHC). Judge the compartment as well as the tissue: cytoplasmic staining is documented in sections, whereas the plasma-membrane assignment comes from ICC-IF (HPA tissue IHC; HPA ICC-IF). |
| Strong, isolated nuclear staining dominates the candidate positive cells. | A nuclear-only pattern conflicts with KISS1R's cell-membrane topology and the reported cytoplasmic tissue-IHC pattern (UniProt Q969F8 topology; HPA tissue IHC). Treat it as a suspected artefact and review the controls before scoring it as KISS1R (general IHC practice). Cytoplasmic staining alone is not grounds for rejection (HPA tissue IHC). |
| Strong staining appears in adipocytes or bone-marrow hematopoietic cells. | HPA reports KISS1R as Not detected in those specific cell populations (HPA tissue IHC). Unexpected staining raises concern for cross-reactivity or endogenous detection activity; it does not establish either cause on its own (general IHC practice). Compare cell identity, staining distribution and detection controls before assigning a cause. |
| Color spreads across the section without a clear cell-associated pattern. | Diffuse deposit has little value for identifying KISS1R-positive cells, particularly when positive and negative reference populations can be compared (HPA tissue IHC; general IHC practice). Review the no-primary control, blocking, washes and detection steps for background (general IHC practice). Do not turn widespread color into a compartment call. |
| No signal is visible in a section containing placental trophoblasts. | This is an inconclusive run: HPA reports High trophoblast staining, and UniProt describes placental expression (HPA tissue IHC; UniProt Q969F8 tissue specificity). Verify the cell population and inspect the assay controls and catalog antibody's IHC-P instructions before interpreting the sample as biologically negative (general IHC practice). |
💡Expected KISS1R appearanceCall a positive result when the relevant trophoblasts, hippocampal neurons or Leydig cells show clear cell-associated staining consistent with the HPA cytoplasmic IHC pattern and their reported High levels; isolated nuclear color or staining in HPA-undetected reference cells is suspect (HPA tissue IHC; UniProt Q969F8 topology).
| Topology and compartment | KISS1R has 7 transmembrane segments, extracellular and cytoplasmic regions, and no annotated soluble chain (UniProt Q969F8 topology; processing). This supports a membrane-receptor interpretation, but HPA's observed paraffin-section pattern is cytoplasmic (HPA tissue IHC). Do not require a sharp membrane outline to accept every IHC-positive cell. |
| Tissue and gestational context | HPA reports High staining in placental trophoblasts and several other specified cell types, but Not detected staining in selected reference populations (HPA tissue IHC). UniProt reports greater KISS1R expression in early than term placenta and higher expression in first-trimester trophoblasts (UniProt Q969F8 tissue specificity). Record the sampled cell population and placental stage when known. |
| Strength of IHC evidence | The HPA tissue-IHC rating is Approved despite low consistency between antibody staining and RNA expression (HPA reliability). Its listed IHC antibody, HPA007156, is Approved; the separate HPA071913 entry is Supported for ICC, with no IHC status supplied (HPA antibodies). These labels warrant cautious interpretation of an isolated unexpected pattern. |
| IF/ICC Q&A | Q: Should IF/ICC show the same outline as chromogenic paraffin IHC? A: HPA's ICC-IF result is mainly plasma membrane, with additional vesicles, while its tissue-IHC summary says cytoplasmic (HPA ICC-IF; HPA tissue IHC). Compare each image with its own assay context; this section supplies no IF/ICC protocol option. |
| Situation | Likely cause | Next action |
|---|---|---|
| Trophoblasts show no stain. | The expected positive-cell landmark is absent, or the run may have failed (HPA: High in trophoblastic cells; general IHC practice). | Confirm trophoblast identity, then check controls and the catalog antibody's IHC-P instructions for retrieval, dilution and detection (general IHC practice). |
| Signal is nuclear only. | The compartment conflicts with membrane topology and reported tissue-IHC cytoplasmic staining (UniProt Q969F8 topology; HPA tissue IHC). | Inspect the no-primary control and cell boundaries; repeat or verify with an independent approach before calling KISS1R positive (general IHC practice). |
| Adipocytes or marrow hematopoietic cells stain strongly. | Those cell types are listed as Not detected by HPA; cross-reactivity or endogenous detection activity is possible (HPA tissue IHC; general IHC practice). | Check cell identification and no-primary controls, then review blocking and detection chemistry before scoring the signal (general IHC practice). |
| Color is diffuse across cells and surrounding section. | Background may obscure the cell-associated distribution needed for interpretation (general IHC practice). | Compare no-primary controls, review blocking and wash steps, and score only cells with a clear interpretable pattern (general IHC practice). |
| Membrane outlining is weak, but cytoplasmic color is clear. | HPA describes cytoplasmic staining in tissue IHC, while its mainly membrane localization comes from ICC-IF (HPA tissue IHC; HPA ICC-IF). | Assess the stained cell type against HPA tissue references and controls; do not reject tissue IHC solely for lacking crisp membrane outlining (HPA tissue IHC; general IHC practice). |
| Placental samples show differing intensity. | UniProt reports higher expression in early than term placenta and higher levels in first-trimester trophoblasts (UniProt Q969F8 tissue specificity). | Record gestational stage when available and compare like cell populations under the same scoring criteria; investigate technical controls before attributing a difference to biology (general IHC practice). |
Experiment evidence
IHC & IF images showing KISS1R staining
A01364-2 · IHCIHC analysis of GPR54/KISS1R using anti-GPR54/KISS1R antibody (A01364-2). GPR54/KISS1R was detected in a paraffin-embedded section of human
A01364-2 · IHCIHC analysis of GPR54/KISS1R using anti-GPR54/KISS1R antibody (A01364-2). GPR54/KISS1R was detected in a paraffin-embedded section of human
A01364-2 · IFIF analysis of GPR54/KISS1R using anti-GPR54/KISS1R antibody (A01364-2). GPR54/KISS1R was detected in an immunocytochemical section of CACO-
HPA · HypothalamusHuman Protein Atlas IHC, Hypothalamus. Source: https://www.proteinatlas.org/ENSG00000116014-KISS1R/tissue/hypothalamus#imid_1456
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000116014-KISS1R/tissue/cerebral+cortex#imid_20805044
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000116014-KISS1R/tissue/colon#imid_20804970
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000116014-KISS1R/tissue/liver#imid_20804979
HPA · ICC-IF Hep-G2Human Protein Atlas immunofluorescence, Hep-G2, antibody HPA071913; green = KISS1R, blue = nucleus, red = microtubules.
HPA · ICC-IF Hep-G2Human Protein Atlas immunofluorescence, Hep-G2, antibody HPA071913; green = KISS1R, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for KISS1R IHC & IF
🧪Run placenta first and score trophoblastic cells, where KISS1R staining is High (HPA: High in placental trophoblastic cells). Use adipose tissue as the negative comparator, scoring adipocytes, where staining is Not detected (HPA: Not detected in adipocytes); on the placenta slide, compare cells outside the trophoblastic compartment with background, but do not presume they are KISS1R-negative.
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 ICC-IF images show KISS1R in Hep-G2, SH-SY5Y, U2OS, with annotated localisation: Plasma membrane (supported) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control and a concentration-matched rabbit IgG isotype control for the rabbit primary antibody (selected-SKU IHC caption: rabbit primary and goat anti-rabbit secondary); use a validated KISS1R knockout sample, if available, as the biological specificity control. For placental DAB staining, block endogenous peroxidase and check for endogenous biotin because the pictured detection method uses a biotinylated secondary and streptavidin–biotin complex (selected-SKU IHC caption: SABC with DAB).
⚠️Feasibility: A KISS1R-specific fixation window or fixation effect is unreported, and the selected-SKU paraffin-section caption does not state the fixative (selected-SKU IHC caption: fixative unreported). Heat-mediated retrieval in EDTA at pH 8.0 was used for the pictured IHC section; whether KISS1R staining depends on that retrieval condition is unreported (selected-SKU IHC caption: EDTA retrieval). Frozen-section ease is unreported; for IF/ICC, HPA reports supported plasma-membrane localization and additional vesicle localization, but those images do not establish that the catalog antibody works in IF/ICC (HPA: subcellular localization and ICC-IF images).
HPA tissue IHC evidence for KISS1R
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — 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 |
|---|---|---|---|---|
| Adrenal gland | Glandular cells | High | Protein (IHC) | HPA → |
| Hippocampus | Neuronal cells | High | Protein (IHC) | HPA → |
| Ovary | Follicle cells | High | Protein (IHC) | HPA → |
| Parathyroid gland | Glandular cells | High | Protein (IHC) | HPA → |
| Placenta | Trophoblastic cells | High | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Cerebellum | Cells in granular layer | Not detected | Protein (IHC) | HPA → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Esophagus | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced KISS1R IHC Tips
Troubleshoot KISS1R staining in paraffin sections using the catalog antibody’s IHC conditions, receptor topology, and tissue evidence.
Which retrieval conditions should I start with for KISS1R IHC?
Start with heat-mediated retrieval in EDTA at pH 8.0 for paraffin sections (datasheet A01364-2). The selected tissue image used this retrieval before an overnight 4°C incubation with 2 μg/ml primary antibody (datasheet A01364-2). If staining is weak, check that sections remain attached and compare retrieval heating and cooling times across matched sections before changing the buffer. Include a positive-control section with each run so a retrieval failure is distinguishable from low expression in the test tissue. Score staining in intact cells rather than treating stronger staining at torn or lifted edges as successful retrieval.
How should I troubleshoot weak staining when fixation history is uncertain?
The selected paraffin-section caption does not report a fixative, so KISS1R-specific fixation sensitivity is unknown (datasheet A01364-2). Record the available fixation history and process test and control sections together, holding section thickness, retrieval, and antibody incubation constant. Start with EDTA at pH 8.0 and 2 μg/ml primary antibody overnight at 4°C, the conditions reported for the selected image (datasheet A01364-2). If controls stain but the test section does not, assess tissue preservation and expected cell types before assigning the result to fixation. Do not use that caption to infer a formalin protocol or a target-specific response to overfixation.
Should KISS1R staining be confined to the cell surface?
Prioritise interpretable plasma-membrane staining: KISS1R is annotated at the cell membrane, and plasma membrane is its supported main location in cell imaging (UniProt Q969F8; HPA subcellular). Vesicular signal can also be plausible, while tissue IHC has reported cytoplasmic staining, including in hypothalamus (HPA subcellular; HPA tissue IHC). Examine whether staining outlines intact cells or instead spreads uniformly across the section, especially at damaged edges. Use the same compartment criteria in test and control sections, and record membrane and cytoplasmic staining separately. Because HPA reports low consistency between staining and RNA data, compartment alone cannot establish specificity (HPA tissue IHC).
How does the antibody epitope affect interpretation of KISS1R staining?
Confirm the catalog antibody’s immunogen or epitope before deciding whether surface staining alone is expected; the supplied caption does not identify it (datasheet A01364-2). KISS1R has 7 transmembrane segments, an extracellular N terminus, and a cytoplasmic C terminus (UniProt Q969F8 topology). Its extracellular N terminus carries annotated glycosylation sites at residues 10, 18, and 28, but their effect on this antibody’s staining is unknown (UniProt Q969F8 glycosylation; datasheet A01364-2). The supplied record annotates 0 isoforms, so do not assign differing staining patterns to a named isoform (UniProt Q969F8). Compare staining across matched sections and compartments before attributing a discrepancy to epitope accessibility.
How can I adapt the IHC findings to a KISS1R multiplex IF experiment?
Treat IF as a separate optimisation: the selected antibody evidence describes chromogenic staining of a paraffin section, with no fixative reported (datasheet A01364-2). Pair KISS1R with a marker for the expected cell population, such as a trophoblast marker in placenta, where trophoblastic cells have reported high staining (HPA tissue IHC). Choose fluorophores after imaging an unstained section to identify tissue autofluorescence, and include single-colour controls when checking bleed-through. If the epitope is cytoplasmic, optimise mild permeabilisation; if extracellular, compare staining without permeabilisation, since KISS1R spans the membrane 7 times (UniProt Q969F8 topology). Do not carry the IHC antibody concentration into IF without titration.
What should I check when DAB staining is diffuse or widespread?
First compare the stained section with a no-primary control and inspect whether colour follows cells, tissue edges, or deposits. The selected protocol used 10% goat serum, a biotinylated anti-rabbit secondary, a streptavidin–biotin complex, and DAB (datasheet A01364-2). For chromogenic IHC, verify that a peroxidase-blocking step is effective and consider a detection-system control if background persists. Titrate the primary around the reported 2 μg/ml condition while keeping retrieval at EDTA pH 8.0 during that comparison (datasheet A01364-2). Check the no-primary control before interpreting widespread cytoplasmic colour as KISS1R, particularly because HPA reports low staining–RNA consistency (HPA tissue IHC).
How should I quantify KISS1R across heterogeneous tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring, then use a consistent H-score or percentage of positive cells across matched sections. For example, score membrane and cytoplasmic staining separately because plasma membrane is the supported main location, while tissue IHC also reports cytoplasmic expression (HPA subcellular; HPA tissue IHC). Normalise positive-cell counts to all evaluable cells of the same type, or report positive-cell density per mm² of viable tissue. Exclude folds, detached edges, and necrotic areas using the same rules for every section. Keep retrieval, detection, exposure to DAB, and scoring thresholds consistent within the comparison.
How can I distinguish a true KISS1R signal from an IHC artefact?
Look for reproducible staining in intact cells with plausible membrane or vesicular localisation, while documenting cytoplasmic signal separately (UniProt Q969F8; HPA subcellular; HPA tissue IHC). Placental trophoblastic cells and hippocampal neuronal cells have reported high tissue staining, whereas adipocytes were reported as not detected; these patterns can guide control selection without proving antibody specificity (HPA tissue IHC). Distrust colour concentrated at cut edges, folds, or necrotic regions, and investigate staining in the no-primary control as possible detection background. The selected method uses a biotin-based system and DAB, so check detection controls when endogenous enzyme or biotin-related colour is suspected (datasheet A01364-2). Interpret any positive result cautiously because HPA rates staining–RNA consistency as low (HPA tissue IHC).
Boster reagents
Best KISS1R / KiSS-1 receptor IHC Antibodies
A01364-2 has paraffin-section IHC images from human and mouse tissue and an IF/ICC image from human CACO-2 cells (A01364-2 image captions).
Real IHC data
Anti-GPR54/KISS1R Antibody ®
Cat # A01364-2
A01364-2 has IHC images from human gall bladder adenosquamous carcinoma, thyroid papillary carcinoma and liver cancer tissue, plus mouse colon tissue (A01364-2 IHC captions). The same SKU has an IF/ICC image from human CACO-2 cells; the catalog lists human, mouse and rat reactivity (A01364-2 IF caption; catalog: reactivity).
Which to pick: For tissue IHC, choose A01364-2 at the listed 1–2 μg/ml starting concentration; its images show paraffin sections, and the fixative is unreported (datasheet: IHC dilution; A01364-2 IHC captions). For IF/ICC, A01364-2 is also listed at 5 μg/ml and has a human CACO-2 cell image (datasheet: IF dilution; A01364-2 IF caption). For cross-species planning, A01364-2 lists human, mouse and rat reactivity, while the supplied IHC images document human and mouse samples and the IF image documents human cells (catalog: reactivity; A01364-2 image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q969F8 (KISSR_HUMAN, KiSS-1 receptor).
- Human Protein Atlas. KISS1R tissue IHC expression (reliability: Approved).
- Human Protein Atlas. KISS1R subcellular location (ICC-IF): Mainly localized to the plasma membrane. In addition localized to vesicles..
- Human Protein Atlas. KISS1R antibody validation summary (2 antibodies).
- KISS1 and KISS1R expression in the human and rat carotid body and superior cervical ganglion. European journal of histochemistry : EJH 2011 — PMC3284150.
- Kisspeptin/kisspeptin receptor system in pseudopregnant rabbit corpora lutea: presence and function. Scientific reports 2019 — PMC6433948.
- Differential Expression of Kisspeptin System and Kisspeptin Receptor Trafficking during Spermatozoa Transit in the Epididymis. Genes 2022 — PMC8871750.
- Kisspeptin as a Precision Biomarker in Personalized Pharmacy: Implications for Individualized Monitoring of Early Pregnancy Viability. Pharmacy (Basel, Switzerland) 2026 — PMC13306833.
- PubMed PMID:11385580 — UniProt-cited evidence.
- PubMed PMID:11414709 — UniProt-cited evidence.
- PubMed PMID:11387329 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for KISS1R (KiSS-1 receptor). Expected localisation Cytoplasmic in tissue (HPA tissue IHC); membrane annotated (UniProt). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A01364-2). Validated IHC antibody: A01364-2 at 1-2 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Adrenal gland (Glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human gall bladder adenosquamous carcinoma tissue; fixative not specified…; 2. Fixation: Image fixative and duration unreported (datasheet A01364-2); 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 A01364-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A01364-2); 8. Primary antibody: Rabbit anti-KISS1R, 1-2 μg/ml (datasheet A01364-2); 9. Primary incubation: Overnight at 4 °C (datasheet A01364-2). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Antibody staining has low consistency with RNA data (HPA tissue IHC); Isoform / epitope: No isoforms annotated; extracellular and cytoplasmic regions differ (UniProt); Regulation: Higher in first-trimester trophoblasts (UniProt). Evidence: UniProt Q969F8, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the plasma membrane. In addition localized to…, Datasheet A01364-2, PMC3284150, PMC6433948. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/KISS1R/immunohistochemistry-ihc-guide.