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GIT1 / ARF GTPase-activating protein GIT1 · IHC design guide
Design Immunohistochemistry for GIT1
Plan chromogenic GIT1 IHC in paraffin sections using cerebral cortex neurons and fallopian tube glandular cells as high-staining references (HPA tissue IHC). This guide covers fixation consistency, a primary antibody range of 2–5 μg/mL (datasheet A02140-3), controls and cytoplasmic scoring (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
GIT1 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 | General cytoplasmic staining in tissue (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining in neurons, glandular and urothelial cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A02140-3) | |
| Positive control | Cerebral cortex+4 more · see all | |
| Negative control | Smooth muscle+1 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific) | |
| Caveat | Antibody staining and RNA show medium consistency (HPA tissue IHC) | |
| Regulation | Expression regulation is unreported (UniProt) | |
| Isoform / epitope | 3 isoforms; epitope coverage is unspecified (UniProt) |
Section 1
Recommended GIT1 IHC & IF Protocols
The catalog antibody’s IHC-P protocol is accompanied by two published GIT1 IHC protocols for liver and colon cancer specimens (PMC3642222; PMC8806235).
| Sample | Paraffin-embedded human appendiceal adenocarcinoma tissue; fixative not specified (datasheet A02140-3) |
| Fixation | Image fixative and duration unreported (datasheet A02140-3); 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 A02140-3); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A02140-3) |
| Primary antibody | Rabbit anti-GIT1, 2-5 μg/ml (datasheet A02140-3) |
| Primary incubation | Overnight at 4 °C (datasheet A02140-3) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A02140-3) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | GIT1-positive staining in neuronal cells of cerebral cortex (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA retrieval at pH 8.0 (datasheet: A02140-3); one published HCC protocol also uses microwaved EDTA (PMC8806235).
Section 2
What Is the Expected GIT1 Staining Pattern?
GIT1 is an intracellular protein without a transmembrane segment (UniProt Q9Y2X7 topology). In paraffin section IHC, expect mainly cytoplasmic staining, including high staining in cerebral cortex neurons, fallopian tube and small intestine glandular cells, and urinary bladder urothelial cells (HPA tissue IHC). HPA rates the tissue staining reliability Enhanced, while reporting medium consistency between antibody staining and RNA expression (HPA tissue IHC).
| Clear cytoplasmic staining in cerebral cortex neurons; similarly strong staining in selected glandular or urothelial cells. | This fits the general cytoplasmic profile and reported High staining in these cell populations (HPA tissue IHC). Compare identifiable cells within the section: a tissue label alone does not establish which cells are positive (general IHC practice). |
| Predominantly nuclear staining, with little cytoplasmic staining in the expected positive cells. | A nucleus dominant pattern does not match the reported cytoplasm, focal adhesions, or other intracellular sites (UniProt Q9Y2X7 subcellular location; HPA subcellular ICC-IF). Review controls and staining distribution before treating it as GIT1; the supplied sources do not establish a nuclear IHC pattern. |
| Strong staining in smooth muscle cells or soft tissue fibroblasts. | These are reported as Not detected by HPA tissue IHC. If expected positive cells stain in the same run, investigate nonspecific antibody binding or endogenous chromogen activity (general IHC practice). An isolated unexpected cell result does not by itself identify which mechanism caused it. |
| Diffuse colour across cells and extracellular spaces, obscuring cell boundaries. | That distribution is difficult to reconcile with the reported general cytoplasmic pattern (HPA tissue IHC). Assess background with an appropriate primary antibody omission control, and inspect blocking, washes, and chromogen development (general IHC practice). Do not score an unreadable field as broadly GIT1 positive. |
| No discernible signal in cerebral cortex neuronal cells. | HPA reports High neuronal staining there (HPA tissue IHC), so a negative result calls for a run and specimen check. Examine section integrity and controls, then review retrieval, antibody dilution, and detection using the validated IHC procedure (general IHC practice); HPA does not establish a GIT1 specific fixation effect. |
💡Expected GIT1 appearanceCall positive when identifiable expected cells show chiefly cytoplasmic staining, potentially High in cerebral cortex neurons or the specified glandular and urothelial cells (HPA tissue IHC); nucleus dominant staining or uniform extracellular colour warrants a background or specificity check (UniProt Q9Y2X7 subcellular location; general IHC practice).
| Compartment and resolution | GIT1 cycles among cytosolic complexes, focal adhesions, and membrane protrusions (UniProt Q9Y2X7 subcellular location). HPA describes general cytoplasmic tissue IHC staining (HPA tissue IHC). Routine chromogenic sections may not resolve small adhesion sites, so their absence as distinct puncta is not a negative call (general IHC practice). |
| Tissue and cell context | HPA reports High staining in four listed cell populations, Medium in several others, and no detected staining in smooth muscle cells or soft tissue fibroblasts (HPA tissue IHC). Choose comparisons at the cell population level; staining intensity is not expected to be uniform across tissues (HPA tissue IHC). |
| Antibody evidence | One listed antibody is IHC Enhanced and another is IHC Approved (HPA antibody validation). HPA defines IHC Enhanced as a pattern reproduced by independent antibodies or orthogonal data (HPA antibody validation). These ratings support interpretation of the reported pattern but do not prove every signal in a new section is specific. |
| Protein forms and epitope | UniProt lists 3 isoforms and a single 1–761 chain, with no signal peptide, propeptide, or transmembrane segment (UniProt Q9Y2X7). Whether an antibody detects every isoform depends on its epitope; no epitope or target specific retrieval effect is supplied here. |
| Phosphorylation | UniProt records modified residues, including phosphotyrosine 224 and several phosphoserines (UniProt Q9Y2X7). This record does not show that phosphorylation changes staining by the IHC-validated antibody; assess such an effect only with antibody specific evidence. |
| Situation | Likely cause | Next action |
|---|---|---|
| Known positive cerebral cortex neurons appear negative. | Possible run failure, weak detection, or a problem with the section or retrieval (general IHC practice); cortex neurons are reported High (HPA tissue IHC). | Check a concurrently processed positive control, section integrity, retrieval conditions, and the IHC-validated antibody's stated procedure (general IHC practice). Do not assign a GIT1 specific fixation cause from these sources. |
| Most cell types stain with similar intensity. | The result conflicts with the reported cell dependent levels, including undetected smooth muscle cells and fibroblasts (HPA tissue IHC); nonspecific or endogenous chromogen signal is possible (general IHC practice). | Compare expected positive and undetected populations in the same run, then inspect primary antibody omission controls, blocking, washes, and detection chemistry (general IHC practice). |
| Nuclei dominate the staining. | Predominantly nuclear localisation is unsupported by the supplied GIT1 locations (UniProt Q9Y2X7 subcellular location; HPA subcellular ICC-IF). | Check whether the cytoplasm of expected positive cells also stains, and compare with a primary antibody omission control before scoring the nuclei as positive (general IHC practice). |
| Staining is granular outside cells or concentrates on tissue edges. | Precipitate or edge related background may mimic signal (general IHC practice); it does not establish the reported cytoplasmic cell pattern (HPA tissue IHC). | Inspect an unstained or primary antibody omission control and review chromogen development and section handling (general IHC practice). Score only interpretable intracellular staining. |
| Focal adhesion puncta are not visible in an otherwise cytoplasmic positive section. | HPA's tissue IHC profile is general cytoplasmic, while focal adhesion localisation is supported by ICC-IF (HPA tissue IHC; HPA subcellular ICC-IF). | Judge the IHC result against cytoplasmic staining in expected cells (HPA tissue IHC). Do not require individually resolved adhesion sites in a chromogenic section (general IHC practice). |
| What pattern should IF/ICC show? | HPA supports cytosol and focal adhesion sites as main locations and approves an additional mitochondrial location (HPA subcellular ICC-IF). | Assess IF/ICC localisation against those reported compartments and its own controls (HPA subcellular ICC-IF; general IF practice). Use the separate IF/ICC guide for its workflow. |
Experiment evidence
IHC & IF images showing GIT1 staining
A02140-3 · IHCIHC analysis of GIT1 using anti-GIT1 antibody (A02140-3). GIT1 was detected in a paraffin-embedded section of human appendiceal adenocarcino
A02140-3 · IHCIHC analysis of GIT1 using anti-GIT1 antibody (A02140-3). GIT1 was detected in a paraffin-embedded section of human gall bladder adenosquamo
A02140-3 · IFIF analysis of GIT1 using anti-GIT1 antibody (A02140-3). GIT1 was detected in an immunocytochemical section of A549 cells. Enzyme antigen re
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000108262-GIT1/tissue/cerebral+cortex#imid_1626860
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000108262-GIT1/tissue/colon#imid_1626778
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000108262-GIT1/tissue/liver#imid_1626795
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000108262-GIT1/tissue/kidney#imid_1626796
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA004059; green = GIT1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA004059; green = GIT1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for GIT1 IHC & IF
🧪Run cerebral cortex first; neuronal cells should stain strongly (HPA: High in cerebral cortex neuronal cells). Use smooth muscle as the negative tissue, where smooth muscle cells are not detected (HPA: Not detected in smooth muscle cells); on the cortex slide, compare neuronal staining with background in other cells, without assuming those cells are GIT1-negative (HPA: High is assigned to neuronal cells).
Positive control tissue: Cerebral cortex (Neuronal cells, HPA High)
Negative control tissue: Smooth muscle (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show GIT1 in A-431, U-251MG, U2OS, A-549, with annotated localisation: Focal adhesion sites (supported), Cytosol (supported) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control and a concentration-matched rabbit IgG isotype control; confirm specificity with GIT1 knockout material or a validated immunizing-peptide block (caption: rabbit primary antibody; standard IHC practice). Block endogenous peroxidase and check for endogenous biotin because the caption uses a biotinylated secondary and DAB detection (selected-SKU tissue-IHC caption).
⚠️Feasibility: A target-specific fixation window is unreported, and the selected-SKU paraffin-section caption does not state a fixative (selected-SKU tissue-IHC caption). The caption uses heat retrieval in EDTA at pH 8.0, but does not establish that retrieval is required or that frozen sections or IF are easier (selected-SKU tissue-IHC caption). Cerebral cortex can show neuronal lipofuscin autofluorescence if assessed by IF, so check an unstained section before interpreting fluorescence (standard IF practice).
HPA tissue IHC evidence for GIT1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — 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 |
|---|---|---|---|---|
| Cerebral cortex | Neuronal cells | High | Protein (IHC) | HPA → |
| Fallopian tube | Glandular cells | High | Protein (IHC) | HPA → |
| Small intestine | Glandular cells | High | Protein (IHC) | HPA → |
| Urinary bladder | Urothelial cells | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
Section 3
Advanced GIT1 IHC Tips
Troubleshoot GIT1 staining in paraffin sections by checking retrieval, compartment, cell identity and detection controls before comparing staining across samples.
Which retrieval conditions should I start with for GIT1 paraffin-section IHC?
Start with heat-mediated retrieval in EDTA pH 8.0 for paraffin sections (datasheet A02140-3). The selected antibody stained a paraffin-embedded human appendiceal adenocarcinoma section after this retrieval; the caption does not report fixation (datasheet A02140-3). If staining is weak, first check that sections were fully deparaffinised and that heating, cooling and buffer volume were consistent across slides (standard IHC practice). Then vary retrieval duration on matched sections while keeping antibody concentration and detection constant, and compare signal with background and tissue preservation (standard IHC practice). Include a known staining control alongside each retrieval condition so a failed run is distinguishable from a low-expressing specimen (standard IHC practice).
Could fixation explain weak or uneven GIT1 staining?
Target-specific sensitivity of GIT1 to fixation is unknown from the supplied evidence; the selected paraffin-section caption does not state a fixative (datasheet A02140-3). Record fixative, fixation duration, tissue thickness and processing history for each specimen before comparing staining (standard IHC practice). Excessive or uneven fixation can change epitope accessibility in IHC generally, so compare matched sections processed together and assess morphology before changing retrieval (standard IHC practice). Use EDTA pH 8.0 retrieval as the starting condition for this antibody, then evaluate any processing change against the same staining control (datasheet A02140-3; standard IHC practice). Do not assign a GIT1-specific fixation effect from tissue staining patterns alone (standard IHC interpretation).
Where should convincing GIT1 staining appear in tissue sections?
Expect predominantly cytoplasmic staining in tissue IHC, while remembering that GIT1 also localises to focal adhesions, protrusions and synaptic compartments (HPA tissue IHC profile; UniProt Q9Y2X7 subcellular). HPA reports high staining in cerebral-cortex neuronal cells and medium staining in appendix glandular cells, useful as tissue-context comparisons rather than universal intensity thresholds (HPA tissue IHC). At routine brightfield resolution, small adhesion or synaptic pools may merge into broader cytoplasmic staining, so assess cell morphology and distribution before calling a punctum specific (standard IHC interpretation; UniProt Q9Y2X7 subcellular). Predominantly nuclear staining without a corresponding cytoplasmic pattern deserves review against detection controls and adjacent tissue (HPA tissue IHC profile; standard IHC practice).
Can this stain distinguish GIT1 isoforms or phosphorylation states?
GIT1 has 3 annotated isoforms and multiple modified residues, including phosphotyrosine 224 and phosphoserines 359 and 362 (UniProt Q9Y2X7 isoforms and modified residues). The supplied caption establishes tissue staining with A02140-3 but gives no epitope map or isoform-selectivity claim (datasheet A02140-3). Therefore, score its signal as GIT1 immunoreactivity rather than assigning an isoform or phosphorylation state without separate validation (standard IHC interpretation). If a region stains unexpectedly, check the antibody's epitope documentation and test an independent epitope or orthogonal assay before attributing the pattern to alternative splicing (standard IHC practice; UniProt Q9Y2X7 isoforms). Keep retrieval and detection matched when comparing those stains (standard IHC practice).
How can I check a GIT1 IHC pattern with multiplex immunofluorescence?
Use IF as a spatial cross-check: pair GIT1 with a validated marker for the cell type being scored, such as a neuronal marker when examining cerebral cortex (HPA tissue IHC: high in neuronal cells; standard IF practice). GIT1 is cytosolic and has no transmembrane segment, so use controlled permeabilisation to reach intracellular epitopes, then compare with a no-permeabilisation control if access is uncertain (UniProt Q9Y2X7 topology and subcellular; standard IF practice). Choose fluorophores in channels with low tissue autofluorescence and include single-stain and unstained controls before interpreting overlap (standard IF practice). The paraffin-section caption supplies EDTA pH 8.0 retrieval for IHC, not an IF fixation or staining condition (datasheet A02140-3).
How do I separate weak GIT1 signal from chromogenic background?
Compare the test section with a no-primary control, a known staining control and tissue morphology before adjusting antibody concentration (standard IHC practice). The selected IHC example used 10% goat serum block, 2 µg/ml primary antibody overnight at 4°C, and a biotin-based DAB detection system (datasheet A02140-3). For this detection chemistry, check endogenous peroxidase and endogenous biotin controls where relevant, and stop DAB development consistently across slides (standard IHC practice). Diffuse edge staining, pigment and precipitate that persist without primary antibody should be treated as background, especially when they do not follow the expected cytoplasmic pattern (HPA tissue IHC profile; standard IHC interpretation).
What is a defensible way to quantify GIT1 chromogenic staining? ⚠ ANSWER MARKED FOR VERIFICATION
Define the compartment and cell population before scoring: GIT1 has a general cytoplasmic tissue-IHC profile, and HPA intensity differs across reported cell types (HPA tissue IHC). For glandular or neuronal cells, report the percentage of positive cells and an intensity-weighted H-score on the 0–300 scale, using the same thresholds across batches (standard IHC practice). If spatial distribution matters, report positive-cell density per mm² of viable, annotated tissue as a companion measure (standard IHC practice). Normalise counts to the relevant cell population or viable tissue area, exclude necrosis and folds, and compare slides processed with matched retrieval and development conditions (standard IHC practice).
What findings make a GIT1-positive IHC result convincing?
A convincing result places staining mainly in cytoplasm and in identifiable cells, with distribution consistent across intact tissue rather than confined to section edges (HPA tissue IHC profile; standard IHC interpretation). HPA reports high staining in cerebral-cortex neuronal cells, medium staining in appendix glandular cells, and no detection in smooth-muscle cells or soft-tissue fibroblasts; use these as contextual checks, not absolute controls for every specimen (HPA tissue IHC). Review strong nuclear-only staining, necrotic regions, folds and edge effects before calling them GIT1 positive (HPA tissue IHC profile; standard IHC practice). Signal surviving the no-primary control may reflect endogenous enzyme activity or detection background, so resolve that control before biological interpretation (standard IHC practice).
Boster reagents
Best GIT1 / ARF GTPase-activating protein GIT1 IHC Antibodies
The catalog antibody has IHC images from human paraffin sections and an IF image from A549 cells (catalog image captions). Its listed reactivity is human, mouse and rat (catalog applications and reactivity).
Real IHC data
Anti-GIT1 Antibody ®
Cat # A02140-3
A02140-3 has IHC images from paraffin sections of human appendiceal adenocarcinoma, gall bladder adenosquamous carcinoma, gastric adenocarcinoma and liver cancer (A02140-3 IHC image captions). The same SKU has an IF image from A549 cells and lists IHC, ICC and IF applications with human, mouse and rat reactivity (A02140-3 IF image caption; catalog applications and reactivity).
Which to pick: Choose A02140-3 for paraffin-section IHC: its own IHC captions document those sections, while the fixative is unreported (A02140-3 IHC image captions). For IF/ICC, A02140-3 lists both applications and has an A549 IF image (catalog applications; A02140-3 IF image caption). For mouse or rat work, A02140-3 lists reactivity with both species, although its supplied IHC and IF images use human samples; its host is rabbit and clonality is unreported (catalog reactivity and host; A02140-3 image captions; catalog clone field).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9Y2X7 (GIT1_HUMAN, ARF GTPase-activating protein GIT1).
- Human Protein Atlas. GIT1 tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. GIT1 subcellular location (ICC-IF): Mainly localized to the cytosol and focal adhesion sites. In addition localized to the mitochondria..
- Human Protein Atlas. GIT1 antibody validation summary (2 antibodies).
- GIT1 is a novel prognostic biomarker and facilitates tumor progression via activating ERK/MMP9 signaling in hepatocellular carcinoma. OncoTargets and therapy 2015 — PMC4689273.
- G protein coupled receptor kinase 2 interacting protein 1 (GIT1) is a novel regulator of mitochondrial biogenesis in heart. Journal of molecular and cellular cardiology 2011 — PMC3367479.
- MAT2B-GIT1 interplay activates MEK1/ERK 1 and 2 to induce growth in human liver and colon cancer. Hepatology (Baltimore, Md.) 2013 — PMC3642222.
- GIT1 overexpression promotes epithelial-mesenchymal transition and predicts poor prognosis in hepatocellular carcinoma. Bioengineered 2021 — PMC8806235.
- PubMed PMID:10896954 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:16625196 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for GIT1 (ARF GTPase-activating protein GIT1). Expected localisation General cytoplasmic staining in tissue (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A02140-3). Validated IHC antibody: A02140-3 at 2-5 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Cerebral cortex (Neuronal cells); negative Smooth muscle. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human appendiceal adenocarcinoma tissue; fixative not specified (datasheet A02140-3); 2. Fixation: Image fixative and duration unreported (datasheet A02140-3); 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 A02140-3); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A02140-3); 8. Primary antibody: Rabbit anti-GIT1, 2-5 μg/ml (datasheet A02140-3); 9. Primary incubation: Overnight at 4 °C (datasheet A02140-3). Watch for: Fixation: Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific); Caveat: Antibody staining and RNA show medium consistency (HPA tissue IHC); Isoform / epitope: 3 isoforms; epitope coverage is unspecified (UniProt); Regulation: Expression regulation is unreported (UniProt). Evidence: UniProt Q9Y2X7, HPA tissue IHC · Enhanced, HPA ICC-IF · Mainly localized to the cytosol and focal adhesion sites. In…, Datasheet A02140-3, PMC3642222, PMC8806235. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/GIT1/immunohistochemistry-ihc-guide.