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GHRL / Appetite-regulating hormone · IHC design guide
Design Immunohistochemistry for GHRL
Use stomach glandular cells and duodenal endocrine cells as staining references (HPA tissue IHC). This guide covers consistent fixation, the catalog antibody’s 2–5 μg/mL IHC range (datasheet A01710-2), and interpretation of a secreted, processed precursor (UniProt).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
GHRL 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 in a subset of gastric glandular cells (HPA tissue IHC) | |
| Staining pattern | A subset of stomach glandular cells shows cytoplasmic staining (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A01710-2) | |
| Positive control | Duodenum+1 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 | Secreted protein may appear beyond its cells of origin (UniProt; HPA tissue IHC) | |
| Regulation | Stomach-enriched RNA expression (HPA tissue RNA) | |
| Isoform / epitope | Six isoforms and precursor processing make epitope choice relevant (UniProt) |
Section 1
Recommended GHRL IHC & IF Protocols
The catalog antibody has an IHC-P protocol (datasheet A01710-2). Published GHRL IHC protocols here cover sheep skin appendages (PMC11769205) and rat hypothalamus (PMC9200359).
| Sample | Paraffin-embedded human gastric cancer tissue; fixative not specified (datasheet A01710-2) |
| Fixation | Image fixative and duration unreported (datasheet A01710-2); 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 A01710-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A01710-2) |
| Primary antibody | Rabbit anti-GHRL, 2 μg/ml (datasheet A01710-2) |
| Primary incubation | Overnight at 4 °C (datasheet A01710-2) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A01710-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | GHRL-positive staining in endocrine cells of duodenum (HPA tissue IHC: High). HPA tissue profile: High cytoplasmic expression in a subset of glandular cells in stomach. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA retrieval at pH 8.0 for the catalog antibody (datasheet A01710-2). The sheep skin protocol used citrate at pH 6 (PMC11769205).
Section 2
What Is the Expected GHRL Staining Pattern?
GHRL is a secreted precursor with no transmembrane segment (UniProt Q9UBU3). In paraffin section IHC, expect cytoplasmic staining in a subset of stomach glandular cells and in duodenal endocrine cells (HPA tissue IHC). HPA rates the tissue pattern Enhanced, while noting that secretion can complicate agreement between the site of protein staining and the site of RNA expression (HPA tissue IHC).
| A subset of stomach glandular cells shows cytoplasmic staining; duodenal endocrine cells stain more strongly. | This matches the reported cell pattern (HPA tissue IHC). HPA lists stomach glandular staining as Medium and duodenal endocrine staining as High; its stomach profile describes high cytoplasmic expression in a subset of glandular cells (HPA tissue IHC). |
| The dominant signal outlines cell membranes or fills nuclei instead of marking cytoplasm. | That compartment does not match the reported stomach pattern (HPA tissue IHC). GHRL is secreted and has no transmembrane segment (UniProt Q9UBU3 topology). Treat a dominant nuclear or membrane pattern as suspect and review morphology and detection controls (general IHC practice). |
| Adipocytes or appendix endocrine cells stain strongly alongside, or instead of, expected positive cells. | HPA reports GHRL as Not detected in those cell populations (HPA tissue IHC). Consider antibody cross-reactivity or endogenous detection activity; check control slides before assigning the staining to GHRL (general IHC practice). |
| Color is widespread across the section, with little separation between cells and surrounding tissue. | Diffuse background prevents reliable cell-level interpretation (general IHC practice). Because GHRL is secreted, extracellular signal alone cannot identify its cell of origin (UniProt Q9UBU3). Compare background with the cellular pattern in a known-positive section (HPA tissue IHC). |
| Expected cells show no signal in a stomach or duodenal positive-control section. | An absent control signal makes a negative study section inconclusive (general IHC practice). Recheck the staining run before interpreting absence: HPA reports staining in stomach glandular cells and duodenal endocrine cells, with different reported levels (HPA tissue IHC). |
💡Expected GHRL appearanceCall positive when cytoplasmic staining identifies a subset of stomach glandular cells or duodenal endocrine cells at the reported Medium or High levels; dominant nuclear, membrane, or indiscriminate staining is suspect (HPA tissue IHC; UniProt Q9UBU3 topology).
| Cell population and tissue (HPA tissue IHC) | Stomach staining is limited to a subset of glandular cells; duodenal endocrine cells are also positive (HPA tissue IHC). Score the relevant cells, since a whole-section average can obscure a restricted pattern (general IHC practice). |
| Secretion and topology (UniProt Q9UBU3) | GHRL is secreted and lacks a transmembrane segment (UniProt Q9UBU3). Do not interpret extracellular color alone as proof of synthesis by adjacent cells; HPA also cautions that protein and RNA tissue locations may differ (HPA tissue IHC). |
| Precursor processing and epitope (UniProt Q9UBU3) | The 117-residue precursor produces ghrelin peptides and has annotated signal and propeptide regions (UniProt Q9UBU3). The supplied record gives no antibody epitope, so it cannot establish which processed forms either antibody detects. |
| Isoforms (UniProt Q9UBU3) | UniProt lists 6 isoforms (UniProt Q9UBU3). Without epitope information, the contribution of each isoform to the tissue signal is unknown; do not assign staining to a particular isoform from localization alone. |
| Tissue IHC validation (HPA antibodies) | HPA lists HPA014246 and CAB022731 as IHC Enhanced (HPA antibodies). This supports the reported tissue pattern, but does not validate an unspecified catalog antibody, establish its epitope, or supply an IHC dilution. |
| IF/ICC evidence (HPA subcellular) | HPA describes GHRL as secreted but supplies no ICC-IF images or main intracellular location (HPA subcellular). Can the IHC image predict an IF/ICC pattern? Only cautiously; use the separate IF/ICC guide for that application. |
| Situation | Likely cause | Next action |
|---|---|---|
| No staining in the positive-control section. | The run may have failed; a negative result is uninterpretable without a working positive control (general IHC practice). | Check control morphology, reagent delivery, detection and counterstain, then repeat the run (general IHC practice). Use HPA-positive stomach glandular or duodenal endocrine cells as the pattern reference (HPA tissue IHC). |
| Only a few stomach cells stain, raising concern about patchy signal. | A restricted glandular pattern can be expected (HPA tissue IHC). | Assess whether the positive cells are glandular and cytoplasmic before calling the result weak; compare with a positive-control section processed in the same run (HPA tissue IHC; general IHC practice). |
| Strong nuclear or membrane staining dominates. | It conflicts with the reported cytoplasmic stomach pattern and the secreted, nontransmembrane topology (HPA tissue IHC; UniProt Q9UBU3). | Review cellular morphology, omit-primary controls and detection background before scoring the signal as specific (general IHC practice). |
| Unexpected adipocytes or appendix endocrine cells stain. | These cell populations are reported as Not detected (HPA tissue IHC); cross-reactivity or endogenous detection activity may explain the signal (general IHC practice). | Compare expected positive cells with omit-primary and detection controls, and restrict scoring to convincing cellular staining (general IHC practice). |
| Diffuse color obscures cell boundaries. | Background may be technical (general IHC practice); secretion also limits what extracellular staining says about the producing cell (UniProt Q9UBU3). | Inspect controls, blocking and detection conditions; interpret only resolved staining in the expected cell populations (general IHC practice; HPA tissue IHC). |
| Changing retrieval appears to change staining. | Retrieval can affect IHC signal generally, but target-specific fixation or retrieval sensitivity is unreported in these payloads (general IHC practice). | Compare conditions using the same positive-control tissue and assess the reported cell and cytoplasmic pattern; do not infer a GHRL-specific fixation effect (HPA tissue IHC; general IHC practice). |
Experiment evidence
IHC & IF images showing GHRL staining
A01710-2 · IHCIHC analysis of Ghrelin/GHRL using anti-Ghrelin/GHRL antibody (A01710-2). Ghrelin/GHRL was detected in a paraffin-embedded section of human
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000157017-GHRL/tissue/cerebral+cortex#imid_17707671
HPA · StomachHuman Protein Atlas IHC, Stomach. Source: https://www.proteinatlas.org/ENSG00000157017-GHRL/tissue/stomach+2#imid_17707531
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000157017-GHRL/tissue/colon#imid_17707597
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000157017-GHRL/tissue/liver#imid_17707582
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for GHRL IHC & IF
🧪Run duodenum first; its endocrine cells should stain (HPA: High in duodenal endocrine cells), while neighboring non-endocrine cells should remain at background. Run appendix as the negative tissue and assess its endocrine cells (HPA: Not detected in appendiceal endocrine cells).
Positive control tissue: Duodenum (Endocrine 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 GHRL; derive a cell-line control from the positive tissue's cell type (Endocrine cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control and a host-species- and antibody-class-matched isotype control; use GHRL knockout tissue or competition with the cognate immunizing peptide, if available, as a biological specificity control (standard IHC practice). Block endogenous peroxidase and check for residual DAB background in duodenum (caption: peroxidase detection with DAB; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the fixative for the selected A01710-2 paraffin-section example is unreported (selected-SKU caption). That example used heat retrieval in EDTA at pH 8.0, but it does not establish that retrieval is required for every specimen (selected-SKU caption). Whether frozen sections or IF are easier is unestablished; the supplied HPA record has no ICC-IF cell-line images, so assess duodenal background with the negative controls before scoring (HPA: no ICC-IF cell-line images; standard IHC practice).
HPA tissue IHC evidence for GHRL
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data. At least one protein variant secreted, tissue location of RNA and protein might differ and correlation is complex.). 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 |
|---|---|---|---|---|
| Duodenum | Endocrine cells | High | Protein (IHC) | HPA → |
| Stomach | 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 → |
| Adrenal gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | Endocrine cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced GHRL IHC Tips
Use cell type and staining pattern alongside controls when assessing GHRL in chromogenic IHC (HPA tissue IHC; UniProt Q9UBU3).
How should I recover weak GHRL staining in paraffin sections?
Start with heat-mediated antigen retrieval in EDTA at pH 8.0 for paraffin sections (datasheet A01710-2). The selected tissue image used 2 μg/ml primary antibody overnight at 4°C after a 10% goat serum block, giving a matched starting condition for troubleshooting (caption A01710-2). Keep section thickness, heating conditions and detection exposure consistent while comparing retrieval runs (standard IHC practice). Include stomach glandular cells as a reference, and assess the expected subset pattern rather than overall tissue darkness (HPA tissue IHC). If staining remains weak, test a different retrieval buffer as a documented fallback, with matched controls (standard IHC practice).
Could fixation explain variable GHRL staining between paraffin blocks?
GHRL-specific fixation sensitivity is unknown because the selected paraffin-section caption does not state a fixative (caption A01710-2). Record each block’s fixative, fixation duration and processing history before comparing staining intensity across cases (standard IHC practice). For newly collected material, a consistently applied 10% neutral buffered formalin workflow is a routine starting condition, not a demonstrated GHRL optimum (standard IHC practice). Compare blocks using the same EDTA pH 8.0 retrieval and 2 μg/ml antibody condition before changing fixation or detection variables (caption A01710-2; standard IHC practice). Interpret any block-dependent difference cautiously until matched controls show whether tissue processing contributed (standard IHC practice).
Which staining pattern and cells support a GHRL-positive result?
Look for cytoplasmic staining in a subset of stomach glandular cells, matching the reported tissue profile (HPA tissue IHC). Duodenal endocrine cells provide another reported positive population, whereas stomach glandular cells are reported at a lower staining level in the tissue listing (HPA tissue IHC). GHRL is a secreted precursor without a transmembrane segment, so a membrane-restricted pattern alone needs independent validation (UniProt Q9UBU3). Evaluate stained cells against tissue architecture and compare the same compartment across cases under matched development conditions (standard IHC practice). Extracellular staining can complicate assignment to a producing cell; use cell-resolved cytoplasmic signal and controls for that conclusion (UniProt Q9UBU3; standard IHC practice).
Can this stain distinguish mature ghrelin from GHRL precursor or isoforms?
Do not assign a positive section to one molecular species without an epitope map or direct specificity evidence (standard IHC practice). The record lists 6 isoforms, a signal sequence at residues 1–23 and propeptide segments at 52–75 and 99–117 (UniProt Q9UBU3). It also identifies GHRL as a precursor of ghrelin peptides and annotates a leucine amide at residue 98 (UniProt Q9UBU3). The selected IHC caption supplies a staining workflow but no binding-epitope assignment (caption A01710-2). If peptide form matters, report the result as GHRL immunoreactivity until an appropriate epitope-specific assay establishes what the antibody detects (standard IHC practice).
How should I assess GHRL in a multiplex fluorescence experiment?
Plan IF as a separate validation experiment, since the supplied subcellular record contains no ICC/IF cell images (HPA subcellular). Pair GHRL with a validated marker of the expected glandular or endocrine cell population, and examine overlap within individual cells (HPA tissue IHC; standard IF practice). Choose a fluorophore away from strong tissue autofluorescence, checking single-label and unstained controls before interpreting a multiplex image (standard IF practice). If testing an intracellular precursor epitope, titrate permeabilisation; a secreted epitope may require a different access strategy, and the antibody epitope is not specified here (UniProt Q9UBU3; caption A01710-2; standard IF practice). Do not carry the chromogenic 2 μg/ml condition over as an established IF dilution (caption A01710-2).
How can I separate nonspecific brown staining from GHRL signal?
First compare the expected subset of cytoplasmic stomach glandular staining with surrounding cells on the same section (HPA tissue IHC). The selected image used a 10% goat serum block, 2 μg/ml rabbit primary antibody and a peroxidase-based DAB readout (caption A01710-2). Use a no-primary control to assess secondary or detection background, and apply a peroxidase block when endogenous enzyme activity is a concern (standard IHC practice). Keep DAB development matched across test and control sections so diffuse brown deposit is not mistaken for stronger antigen signal (standard IHC practice). If background persists, titrate primary antibody and inspect section edges and damaged areas separately (standard IHC practice).
How should I score GHRL when only a subset of cells stains? ⚠ ANSWER MARKED FOR VERIFICATION
Define the relevant cell population before scoring: stomach glandular cells show a subset pattern, and duodenal endocrine cells are a reported positive population (HPA tissue IHC). Report the percentage of positive cells alongside an H-score on a 0–300 scale when staining intensity is reproducibly graded (standard IHC practice). Normalise positive-cell counts to the number of eligible cells, or report density per mm² of annotated viable tissue when counting discrete cells (standard IHC practice). Exclude necrosis, folds and edges using the same rules in every section (standard IHC practice). Keep retrieval, imaging and DAB development matched, and score controls alongside study samples (standard IHC practice).
What would make an apparent GHRL-positive section unconvincing?
A convincing pattern includes cytoplasmic signal in the expected subset of stomach glandular cells or reported duodenal endocrine cells (HPA tissue IHC). Treat isolated membrane-only staining cautiously because GHRL is secreted and has no transmembrane segment (UniProt Q9UBU3). Strong staining confined to section edges, folds or necrotic regions can reflect processing or detection artefact (standard IHC practice). Brown signal in a no-primary control raises concern about the detection system, including endogenous peroxidase in a DAB workflow (standard IHC practice). Compare cell identity, compartment and control results before calling a case positive; absence of staining alone does not establish loss of GHRL expression (standard IHC practice).
Boster reagents
Best GHRL / Appetite-regulating hormone IHC Antibodies
A01710-2 has real IHC data from a paraffin section of human gastric cancer tissue; its listed reactivity includes human, mouse, and rat (IHC image caption; catalog reactivity).
Real IHC data
Anti-Ghrelin/GHRL Antibody
Cat # A01710-2
A01710-2 was demonstrated by IHC on a paraffin section of human gastric cancer tissue (IHC image caption). It is listed for IHC in human, mouse, and rat samples; no IF application or figure is listed (catalog applications/reactivity; catalog figure list).
Which to pick: Choose A01710-2 for paraffin-section tissue IHC: it is a rabbit polyclonal antibody with an IHC image from human gastric cancer tissue; the caption does not report the fixative (catalog host/clonality; IHC image caption). There is no IF/ICC-validated option in this catalog payload (catalog applications; catalog figure list). For cross-species IHC, A01710-2 lists human, mouse, and rat reactivity, while its supplied IHC image documents human tissue only (catalog reactivity; IHC image caption).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9UBU3 (GHRL_HUMAN, Appetite-regulating hormone).
- Human Protein Atlas. GHRL tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. GHRL subcellular location (ICC-IF): Secreted.
- Human Protein Atlas. GHRL antibody validation summary (2 antibodies).
- Diet Supplementation Influences Ghrelin System Expression in the Skin Appendages of the Sheep. Veterinary sciences 2025 — PMC11769205.
- GHRL as a prognostic biomarker correlated with immune infiltrates and progression of precancerous lesions in gastric cancer. Frontiers in oncology 2023 — PMC10353738.
- Effects of electroacupuncture on the expression of hypothalamic neuropeptide Y and ghrelin in pubertal rats with polycystic ovary syndrome. PloS one 2022 — PMC9200359.
- Ghrelin misbalance affects mice embryo implantation and pregnancy success by uterine immune dysregulation and nitrosative stress. Frontiers in endocrinology 2023 — PMC10722256.
- PubMed PMID:10604470 — UniProt-cited evidence.
- PubMed PMID:10930375 — UniProt-cited evidence.
- PubMed PMID:12414809 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for GHRL (Appetite-regulating hormone). Expected localisation Cytoplasmic staining in a subset of gastric glandular cells (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A01710-2). Validated IHC antibody: A01710-2 at 2 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Duodenum (Endocrine cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human gastric cancer tissue; fixative not specified (datasheet A01710-2); 2. Fixation: Image fixative and duration unreported (datasheet A01710-2); 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 A01710-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A01710-2); 8. Primary antibody: Rabbit anti-GHRL, 2 μg/ml (datasheet A01710-2); 9. Primary incubation: Overnight at 4 °C (datasheet A01710-2). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Secreted protein may appear beyond its cells of origin (UniProt; HPA tissue IHC); Isoform / epitope: Six isoforms and precursor processing make epitope choice relevant (UniProt); Regulation: Stomach-enriched RNA expression (HPA tissue RNA). Evidence: UniProt Q9UBU3, HPA tissue IHC · Enhanced, HPA ICC-IF · Secreted, Datasheet A01710-2, PMC11769205, PMC9200359. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/GHRL/immunohistochemistry-ihc-guide.