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ARHGAP1 / Rho GTPase-activating protein 1 · IHC design guide
Design Immunohistochemistry for ARHGAP1
Plan chromogenic IHC-P for ARHGAP1 using cytoplasmic staining as the expected tissue pattern (HPA tissue IHC). Colon glandular cells show high staining, while adipocytes and skeletal myocytes are reported as not detected (HPA tissue IHC); the catalog antibody's IHC dilution is 1:100–1:300 (datasheet).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
ARHGAP1 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 most tissues (HPA tissue IHC) | |
| Staining pattern | Variable cytoplasmic staining in most tissues (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+1 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A06116) | |
| Caveat | Adipocytes and skeletal myocytes may lack signal (HPA tissue IHC) | |
| Regulation | No specific expression regulator reported (UniProt) | |
| Isoform / epitope | No listed isoforms; one cytoplasmic chain (UniProt) |
Section 1
Recommended ARHGAP1 IHC & IF Protocols
The catalog antibody’s IHC-P protocol is paired with a published mouse calvarial bone IHC method (PMC7900016).
| Sample | Paraffin-embedded human heart tissue; fixative not specified (datasheet A06116) |
| Fixation | Image fixative and duration unreported (datasheet A06116); 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-ARHGAP1, 1:100 - 1:300 (datasheet A06116) |
| 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 | ARHGAP1-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression at variable levels in most tissues. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6.0 HIER at 95–98 °C for 20 min (page retrieval rule); the published method does not specify retrieval (PMC7900016).
Section 2
What Is the Expected ARHGAP1 Staining Pattern?
ARHGAP1 is cytoplasmic and has no transmembrane segment (UniProt Q07960: location and topology). In paraffin-section IHC, expect variable cytoplasmic staining across most tissues, including high staining in selected glandular and epithelial cells (HPA: tissue IHC). HPA rates the tissue staining Approved, with medium consistency between antibody staining and RNA expression (HPA: reliability). Read the result by cell type and compartment, not by tissue name alone.
| Clear cytoplasmic stain in colon glandular cells, bronchial respiratory epithelium, or esophageal squamous epithelium. | This matches cells scored High by HPA and the cytoplasmic location reported by UniProt (HPA: tissue IHC; UniProt Q07960: location). Compare intensity within the relevant cell population; neighboring cell types need not stain equally. |
| Predominantly nuclear or sharply surface-restricted stain, with little cytoplasmic signal. | This conflicts with the expected compartment (UniProt Q07960: cytoplasm; HPA: tissue IHC). Check the counterstain and morphology, then assess background and antibody controls before calling the pattern ARHGAP1. |
| Strong stain in adipocytes or skeletal myocytes. | HPA reports ARHGAP1 as Not detected in those cell types (HPA: adipocytes and skeletal myocytes). Treat reproducible signal there as unexpected and investigate cross-reactivity or detection activity; the HPA finding does not establish absolute protein absence. |
| Diffuse color over tissue and empty spaces, without a recognizable cellular pattern. | That distribution is difficult to interpret as cytoplasmic ARHGAP1 (UniProt Q07960: location; HPA: tissue IHC). Examine a no-primary control and the detection reagents for background before assigning a staining score. |
| No signal in a section containing colon glandular cells or bronchial respiratory epithelial cells. | Those cells are scored High in HPA tissue IHC (HPA: colon and bronchus). First check section quality and assay controls; HPA's Approved rating has medium RNA–staining consistency, so one negative section alone cannot settle target absence (HPA: reliability). |
💡Expected ARHGAP1 appearanceCall a convincing positive result cytoplasmic staining in the relevant epithelial or glandular cells, potentially High in the listed HPA examples; dominant nuclear staining or strong signal in HPA Not detected cell types warrants investigation (HPA: tissue IHC; UniProt Q07960: location).
| Compartment and topology | UniProt places ARHGAP1 in the cytoplasm and lists no transmembrane segment (UniProt Q07960: location and topology). These facts support a cytoplasmic IHC readout; they do not predict a membrane-restricted pattern. |
| Cell-specific intensity | HPA describes variable cytoplasmic expression in most tissues and low tissue specificity at the RNA level (HPA: tissue IHC). Score the named cells: High glandular or epithelial staining and Not detected adipocytes or myocytes can coexist across tissue types. |
| IHC antibody evidence | HPA lists two antibodies, HPA004689 and HPA008285, as Approved for IHC (HPA: antibody validation). This supports pattern comparison, but the supplied record does not give an IHC Enhanced designation or a target-specific fixation effect. |
| IF/ICC Q&A: where is signal expected? | Mainly cytosol (supported); vesicles are an additional approved location, while primary-cilium localization is uncertain (HPA: subcellular ICC-IF). This is context for interpreting IF images; the IHC tissue pattern remains cytoplasmic (HPA: tissue IHC). |
| Protein processing | UniProt lists a single chain spanning residues 1–439, with no signal peptide or propeptide (UniProt Q07960: processing). The supplied evidence gives no cleavage-dependent IHC pattern; do not explain an unusual compartment by presumed shedding. |
| Situation | Likely cause | Next action |
|---|---|---|
| A known High cell population shows no chromogenic signal. | The assay may have failed, or that section may differ from the HPA reference pattern (HPA: High in colon glandular cells; HPA: medium RNA–staining consistency). | Confirm the expected cells are present, inspect a working positive control, and review routine retrieval and detection steps before interpreting the section as negative. |
| Nuclei dominate while cytoplasm is faint. | The dominant compartment disagrees with the reported ARHGAP1 location (UniProt Q07960: cytoplasm; HPA: tissue IHC). Counterstain or nonspecific detection can complicate the read. | Compare the signal with the counterstain, inspect a no-primary control, and repeat interpretation using cytoplasm within the relevant cells as the reference. |
| Adipocytes or skeletal myocytes stain strongly. | These cells are scored Not detected by HPA, making strong staining unexpected (HPA: adipocytes and skeletal myocytes). Cross-reactivity or endogenous detection activity is possible. | Check a no-primary control and tissue morphology. If signal persists only with primary antibody, compare an independently validated IHC antibody where available (HPA: two IHC Approved antibodies). |
| Brown haze obscures cell boundaries throughout the section. | Widespread background can mask the expected cytoplasmic pattern (HPA: tissue IHC; UniProt Q07960: location). In chromogenic IHC, detection reagent background is a general possibility. | Inspect the no-primary control and reagent controls; adjust routine blocking, washing, or detection conditions according to the assay system before rescoring. |
| Signal is uneven or weak across a tissue expected to contain positive cells. | ARHGAP1 staining varies among tissues and cell types, and HPA reports only medium RNA–staining consistency (HPA: tissue IHC and reliability). Uneven section processing is also a general IHC possibility. | Score the HPA-listed cell population separately, compare well-preserved regions, and check a positive control processed in the same run. |
| Color develops in the no-primary control. | Primary-independent signal points to a detection-system source. Endogenous enzyme activity is a general concern when an enzyme-based chromogen is used. | Resolve the control signal before calling ARHGAP1 positive; for HRP detection, check the endogenous-peroxidase blocking step and detection reagents. |
Experiment evidence
IHC & IF images showing ARHGAP1 staining
A06116 · IHCImmunohistochemistry analysis of paraffin-embedded human heart tissue, using RHG1 Antibody. The picture on the right is blocked with the syn
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000175220-ARHGAP1/tissue/cerebral+cortex#imid_1555040
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000175220-ARHGAP1/tissue/colon#imid_1554958
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000175220-ARHGAP1/tissue/liver#imid_1554967
HPA · PancreasHuman Protein Atlas IHC, Pancreas. Source: https://www.proteinatlas.org/ENSG00000175220-ARHGAP1/tissue/pancreas#imid_1554926
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA004689; green = ARHGAP1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA004689; green = ARHGAP1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for ARHGAP1 IHC & IF
🧪Run breast first and expect glandular cells to stain (HPA: High in breast glandular cells); use adipose tissue as the biological low-signal comparator (HPA: Not detected in adipocytes). Within the breast section, cells lacking visible staining should show only background, but no cell type there is established as an internal negative (UniProt Q07960: ubiquitous).
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 ARHGAP1 in A-431, U-251MG, U2OS, ASC52telo, RPTEC/TERT1, hTERT-RPE1 (serum starved), KOLF2.1J, with annotated localisation: Cytosol (supported) (HPA subcellular).
Technical controls: Include no-primary (secondary-only) and primary host- and isotype-matched controls, plus a knockout specimen or matched peptide-block control (A06116 tissue-IHC caption: peptide block). Check the breast section for endogenous peroxidase signal; if using avidin–biotin detection, check endogenous biotin as well (standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the A06116 paraffin-section caption does not state a fixative (A06116 tissue-IHC caption). Retrieval dependence and whether frozen sections or IF are easier are unreported; IF images support mainly cytosolic localization (HPA subcellular: Cytosol supported). No breast-specific artefact is documented in the supplied evidence.
HPA tissue IHC evidence for ARHGAP1
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 | Glandular cells | High | Protein (IHC) | HPA → |
| Bronchus | Respiratory epithelial cells | High | Protein (IHC) | HPA → |
| Cervix | Glandular cells | High | Protein (IHC) | HPA → |
| Colon | Glandular cells | High | Protein (IHC) | HPA → |
Section 3
Advanced ARHGAP1 IHC Tips
Troubleshoot ARHGAP1 staining in paraffin sections by checking cytoplasmic localisation, cell type, controls and processing conditions (UniProt Q07960; HPA tissue IHC).
How should I retrieve ARHGAP1 in paraffin sections when staining is weak?
Start with citrate pH 6.0 heat-induced retrieval at 95–98 °C for 20 min (page retrieval setting). Cool the slides consistently, then compare the suspect section with a positively stained control processed in the same run (standard IHC practice; HPA: high in colon glandular cells). If staining remains weak, test a more alkaline retrieval buffer on matched sections while holding antibody dilution and detection constant (standard IHC troubleshooting). Score cytoplasmic signal in the same cell type across conditions, because ARHGAP1 is mainly cytoplasmic and tissue staining varies (UniProt Q07960; HPA tissue IHC). Discard conditions that increase diffuse background or damage section morphology (standard IHC practice).
Could fixation explain faint or uneven ARHGAP1 staining?
Target-specific fixation sensitivity is unknown from the supplied evidence; the A06116 image caption identifies paraffin-embedded human heart but does not state its fixative (A06116 caption). Record the fixative, fixation duration, processing schedule and section age for each specimen before comparing staining intensity (standard IHC practice). On matched sections, keep retrieval at citrate pH 6.0, 95–98 °C for 20 min while assessing whether a processing difference tracks the weak signal (page retrieval setting; standard IHC troubleshooting). Include a consistently processed positive control, such as colon glandular cells, to separate run failure from specimen variation (HPA: high in colon glandular cells; standard IHC practice). Do not assign a particular fixation effect to ARHGAP1 without a direct comparison (supplied evidence: no target-specific fixation study).
Which staining pattern should count as plausible ARHGAP1 signal?
Expect predominantly cytoplasmic chromogenic staining in positive cells, because ARHGAP1 is annotated as cytoplasmic and tissue IHC shows variable cytoplasmic expression (UniProt Q07960; HPA tissue IHC). A nuclear-only or continuous cell-border pattern needs independent validation before it is scored as ARHGAP1 (UniProt Q07960: cytoplasm, no transmembrane segment; standard IHC interpretation). Examine glandular cells in colon or adrenal gland as positive-pattern references, while recognizing that staining intensity differs among tissues (HPA: high in colon and adrenal gland glandular cells; HPA tissue IHC). Compare target-cell staining with adjacent compartments on the same slide and with a negative reagent control (standard IHC practice). Treat focal puncta cautiously: vesicles appear in subcellular IF data, but that observation alone does not establish a tissue-IHC pattern (HPA subcellular: vesicles approved).
How can I assess whether the antibody epitope suits paraffin IHC?
Check the catalog antibody's stated immunogen or epitope against the 439-residue ARHGAP1 sequence before interpreting a negative section (UniProt Q07960; standard antibody validation practice). The record lists a CRAL-TRIO domain at residues 63–218, a Rho-GAP domain at 244–431 and no annotated isoforms (UniProt Q07960). It also lists several N-terminal phosphoserines, but supplies no evidence that these modifications change this antibody's IHC binding (UniProt Q07960; supplied evidence: no epitope-specific IHC study). Use the A06116 peptide-blocked heart image as evidence of competition for that exact antibody, while recognizing that its caption leaves fixation unspecified (A06116 caption). Confirm the expected cytoplasmic pattern with an independent antibody or orthogonal evidence when epitope identity remains uncertain (UniProt Q07960; standard IHC validation practice).
How should I relate a multiplex IF result to the chromogenic IHC pattern?
Use IF as a separate localisation check, and compare its ARHGAP1-positive cells with the same cell population assessed by chromogenic IHC (standard assay comparison practice). In a multiplex panel, pair ARHGAP1 with a marker identifying the expected cell type, such as glandular epithelium in a colon section, without treating marker overlap as antibody validation (HPA: high in colon glandular cells; standard IF practice). Select a fluorophore channel with low tissue autofluorescence and include single-stain and no-primary controls (standard IF practice). Because ARHGAP1 is cytosolic and has no transmembrane segment, use controlled permeabilisation to reach its intracellular epitope, then verify morphology and background (UniProt Q07960; standard IF practice). Interpret vesicular or ciliary IF puncta cautiously alongside the dominant cytosolic pattern (HPA subcellular: cytosol supported, vesicles approved, primary cilium uncertain).
What should I change when ARHGAP1 staining is diffuse or widespread?
First compare the stained section with a no-primary control and the expected cytoplasmic pattern; widespread color alone is weak evidence because tissue expression varies (standard IHC practice; HPA tissue IHC). Check endogenous peroxidase blocking before chromogenic detection, then inspect whether color also appears in the no-primary section (standard chromogenic IHC practice). Titrate the catalog antibody and detection reagent on adjacent sections while holding retrieval at citrate pH 6.0, 95–98 °C for 20 min (page retrieval setting; standard IHC troubleshooting). Review blocking, wash stringency and counterstain so background reduction does not conceal cytoplasmic signal (standard IHC practice; UniProt Q07960: cytoplasm). Use adipocytes as a low-signal reference only within their annotated context, since HPA reports ARHGAP1 as not detected there (HPA: adipocytes not detected).
How should I score ARHGAP1 staining across tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and cytoplasmic compartment before scoring, since HPA reports variable cytoplasmic expression across tissues (HPA tissue IHC). For glandular cells, report the percentage of positive cells and an H-score based on intensity categories 0–3, with the scoring rule fixed across slides (standard IHC scoring practice; HPA: high in colon glandular cells). If counting discrete positive cells instead, report cells per mm² of viable evaluable tissue and record the sampled area (standard image-analysis practice). Normalize comparisons to the same cell type, viable area, staining run and exposure or scan settings (standard IHC quantification practice). Include a consistently processed reference section because HPA describes medium agreement between staining and RNA data (HPA: Approved, medium consistency).
When is a positive ARHGAP1 result credible rather than artefactual?
A credible result shows cytoplasmic staining in the scored cells, consistent with UniProt localisation and the HPA tissue-IHC profile (UniProt Q07960; HPA tissue IHC). Compare glandular cells reported as high in colon with adipocytes reported as not detected, while allowing genuine tissue-dependent variation (HPA: colon glandular cells high; adipocytes not detected; HPA tissue IHC). Investigate nuclear-only or continuous membrane staining before calling it positive, because ARHGAP1 has a cytoplasmic annotation and no transmembrane segment (UniProt Q07960). Exclude section-edge deposits, necrotic areas and color retained in a no-primary control from scoring; assess endogenous enzyme signal with the same detection workflow (standard chromogenic IHC practice). The A06116 peptide-blocked heart image supports competition for that exact antibody but does not establish the fixative or validate every observed pattern (A06116 caption).
Boster reagents
Best ARHGAP1 / Rho GTPase-activating protein 1 IHC Antibodies
A06116 has a paraffin-section human heart IHC image, listed IF/ICC applications, and human and mouse reactivity; no IF image is supplied (catalog image caption; catalog applications and reactivity).
Real IHC data
Anti-RHG1 ARHGAP1 Antibody
Cat # A06116
A06116 has an IHC image of a paraffin-embedded human heart section with peptide blocking shown (catalog image caption). IF and ICC are listed applications, and human and mouse are listed as reactive species; no IF image is supplied (catalog applications, reactivity, and image records).
Which to pick: For tissue IHC, choose A06116: its own image shows staining in a paraffin-embedded human heart section, with peptide blocking shown; the fixative is unreported (catalog image caption). For IF/ICC, A06116 is the listed option, though no IF image is supplied (catalog applications and image records). For human and mouse work, A06116 is the rabbit polyclonal option with both species listed as reactive; the supplied tissue image documents human IHC only (catalog host, clonality, reactivity, and image caption).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q07960 (RHG01_HUMAN, Rho GTPase-activating protein 1).
- Human Protein Atlas. ARHGAP1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. ARHGAP1 subcellular location (ICC-IF): Mainly localized to the cytosol. In addition localized to vesicles and primary cilium..
- Human Protein Atlas. ARHGAP1 antibody validation summary (2 antibodies).
- Osteoclast-derived small extracellular vesicles induce osteogenic differentiation via inhibiting ARHGAP1. Molecular therapy. Nucleic acids 2021 — PMC7900016.
- PubMed PMID:8253717 — UniProt-cited evidence.
- PubMed PMID:8288572 — UniProt-cited evidence.
- PubMed PMID:15489334 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for ARHGAP1 (Rho GTPase-activating protein 1). Expected localisation Cytoplasmic staining in most tissues (HPA tissue IHC). Antigen retrieval: Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen). Validated IHC antibody: A06116 at 1:100 - 1:300 (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 heart tissue; fixative not specified (datasheet A06116); 2. Fixation: Image fixative and duration unreported (datasheet A06116); 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-induced epitope retrieval in citrate buffer, pH 6.0 , 20 min at 95–98 °C…; 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% normal serum of the secondary host, 30 min , room temperature (standard); 8. Primary antibody: Rabbit anti-ARHGAP1, 1:100 - 1:300 (datasheet A06116); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A06116); Caveat: Adipocytes and skeletal myocytes may lack signal (HPA tissue IHC); Isoform / epitope: No listed isoforms; one cytoplasmic chain (UniProt); Regulation: No specific expression regulator reported (UniProt). Evidence: UniProt Q07960, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the cytosol. In addition localized to vesicles…, Datasheet A06116, PMC7900016. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/ARHGAP1/immunohistochemistry-ihc-guide.