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RAB1B / Ras-related protein Rab-1B · IHC design guide
Design Immunohistochemistry for RAB1B
Plan RAB1B paraffin IHC around general cytoplasmic staining, with high staining in duodenal glandular cells (HPA tissue IHC). Interpret positive staining cautiously because HPA warns that the tissue antibody may target proteins from more than one gene (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
RAB1B 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 observed in tissue (HPA tissue IHC) | |
| Staining pattern | General cytoplasmic staining in tissue cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A04589-1) | |
| Positive control | Duodenum+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 may target proteins from more than one gene (HPA tissue IHC) | |
| Regulation | Low tissue specificity; regulation unreported (HPA tissue IHC) | |
| Isoform / epitope | No annotated isoforms or cleaved chains (UniProt) |
Section 1
Recommended RAB1B IHC & IF Protocols
The catalog antibody protocol uses EDTA pH 8.0 retrieval (datasheet A04589-1). Published RAB1B IHC protocols below cover colorectal tissues (PMC5391239) and mouse xenograft tumors (PMC9980309).
| Sample | Paraffin-embedded human prostate cancer tissue; fixative not specified (datasheet A04589-1) |
| Fixation | Image fixative and duration unreported (datasheet A04589-1); 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 A04589-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A04589-1) |
| Primary antibody | Rabbit anti-RAB1B, 2μg/ml (datasheet A04589-1) |
| Primary incubation | Overnight at 4 °C (datasheet A04589-1) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A04589-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | RAB1B-positive staining in glandular cells of duodenum (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for the catalog antibody (datasheet A04589-1); sodium citrate retrieval was used for a different antibody (PMC9980309).
Section 2
What Is the Expected RAB1B Staining Pattern?
RAB1B is cytoplasmic and membrane associated, with a perinuclear pool and recruitment to ER–Golgi compartments (UniProt Q9H0U4 localization). In paraffin section IHC, expect cytoplasmic staining in glandular cells of duodenum and small intestine, among other HPA high staining cell types (HPA: High). HPA rates tissue IHC Approved, with medium agreement between staining and RNA data, and cautions that its antibodies may detect proteins from more than one gene (HPA: reliability).
| Cytoplasmic chromogen, sometimes concentrated beside the nucleus, in duodenal or small intestinal glandular cells (HPA: High; UniProt Q9H0U4 localization). | This fits the reported tissue pattern and perinuclear localization (HPA: High in glandular cells; UniProt Q9H0U4 localization). Score the cell population and cytoplasmic distribution together. A compact chromogenic focus alone cannot identify Golgi or ER; HPA assigns those organelles from ICC-IF images (HPA: subcellular). |
| Predominantly nuclear or cell surface staining, with little cytoplasmic signal in otherwise positive glandular cells (HPA: High; UniProt Q9H0U4 localization). | That compartment pattern does not match the reported cytoplasmic and membrane associated, perinuclear localization (UniProt Q9H0U4 localization). Treat it as suspect until the staining distribution and detection controls are checked; morphology alone cannot identify the cause. RAB1B has no annotated transmembrane segment (UniProt Q9H0U4 topology). |
| Strong staining chiefly in adipocytes, marrow hematopoietic cells, or esophageal squamous cells (HPA: Not detected in those cells). | This conflicts with HPA's reported tissue IHC pattern (HPA: Not detected). Consider antibody cross reactivity or endogenous detection activity as possible IHC explanations, and inspect a reagent control. HPA itself cautions that its tissue antibodies may recognize proteins from more than one gene (HPA: reliability). |
| Diffuse chromogen across cells and surrounding tissue, obscuring cytoplasmic boundaries and differences among cell populations. | The slide cannot be scored reliably against HPA's cell specific levels while background obscures the cells (HPA: tissue IHC). In routine IHC, nonspecific reagent binding or detection background can produce this appearance. Assess a reagent control and the local tissue background before interpreting weak staining. |
| No visible cytoplasmic signal in duodenal glandular cells, despite preserved tissue and a readable counterstain (HPA: High in glandular cells). | The expected positive cell population has failed to stain relative to HPA tissue IHC (HPA: High). Check the run's detection and positive control first, then review antibody concentration and antigen retrieval as general IHC variables. This observation alone cannot establish that fixation affected a RAB1B epitope. |
💡Expected RAB1B appearanceCall a result consistent when glandular cells show clear cytoplasmic chromogen, potentially enriched near the nucleus, in HPA high staining tissue (HPA: High; UniProt Q9H0U4 localization); isolated nuclear staining or strong signal in HPA not detected cell types warrants investigation (UniProt Q9H0U4 localization; HPA: Not detected).
| Tissue and cell selection | Duodenal and small intestinal glandular cells provide HPA high staining examples; adipocytes and marrow hematopoietic cells are reported as not detected (HPA: tissue IHC). RNA specificity is low across tissues, so a whole tissue label cannot replace identification of the scored cell type (HPA: RNA specificity). |
| Antibody evidence | Two listed antibodies have Approved IHC status, while the tissue profile has medium agreement with RNA and carries a multiple gene detection caution (HPA: antibodies; HPA: reliability). Approved status supports use of the observed pattern as a reference, but cannot by itself resolve whether a particular stained cell contains RAB1B. |
| Subcellular interpretation | HPA ICC-IF supports Golgi as the main location and ER as an additional location (HPA: subcellular). UniProt also describes cytoplasmic and perinuclear localization and recruitment to ER–Golgi compartments (UniProt Q9H0U4 localization). These sources guide a cytoplasmic IHC reading; chromogenic IHC alone does not identify each organelle. |
| IF/ICC cross-check? | What should IF/ICC show? HPA reports mainly Golgi and additional ER localization in ICC-IF (HPA: subcellular). Use that result as a localization comparison, with its own IF/ICC guide for experimental design. It does not establish how strongly either organelle will appear in a paraffin section. |
| Situation | Likely cause | Next action |
|---|---|---|
| High staining glandular cells are blank (HPA: High in duodenum and small intestine). | A failed detection step, unsuitable antibody concentration, or retrieval conditions can cause a false negative in routine IHC; the slide alone does not distinguish them. | Confirm a positive control and reagent performance, then review concentration and retrieval records. Compare the same cell type with HPA's high staining reference (HPA: tissue IHC). |
| Most cells show uniform haze, so cell boundaries are hard to score. | Nonspecific reagent binding, excess detection signal, or incomplete washing are general IHC possibilities. | Inspect a reagent control, wash and blocking steps, and detection exposure. Resume scoring only when glandular cytoplasm can be distinguished from surrounding background (HPA: general cytoplasmic profile). |
| Staining is mainly nuclear in cells expected to be positive (HPA: High). | The location conflicts with reported cytoplasmic and perinuclear RAB1B (UniProt Q9H0U4 localization); the cause remains unresolved from appearance alone. | Recheck the counterstain and chromogen distribution, then compare a positive cell population and a reagent control. Avoid calling a nuclear pattern supportive of RAB1B localization. |
| Adipocytes or marrow hematopoietic cells stain strongly (HPA: Not detected). | Cross reactivity or endogenous detection activity is possible; HPA warns that tissue antibodies may detect proteins from more than one gene (HPA: reliability). | Review reagent controls and compare with an HPA high staining cell population (HPA: tissue IHC). Record the discordant cell type rather than treating all chromogen as target staining. |
| A perinuclear focus appears, but Golgi and ER cannot be separated. | Their reported localization comes from ICC-IF and UniProt, while the paraffin chromogen shows a combined cellular pattern (HPA: subcellular; UniProt Q9H0U4 localization). | Report cytoplasmic staining with perinuclear accentuation. Consult the separate IF/ICC guide if organelle assignment is required; do not infer a specific organelle from the IHC focus alone. |
| A low staining tissue looks weaker than the chosen positive tissue (HPA: Low in selected cell types; HPA: High in glandular cells). | That difference can agree with HPA's cell level categories; weak signal does not by itself show a failed run (HPA: tissue IHC). | Compare matched cell types and the run's positive control before changing conditions. Note HPA's medium staining–RNA agreement and multiple gene detection caution when reporting the result (HPA: reliability). |
Experiment evidence
IHC & IF images showing RAB1B staining
A04589-1 · IHCIHC analysis of RAB1B using anti-RAB1B antibody (A04589-1). RAB1B was detected in paraffin-embedded section of human prostate cancer tissue.
A04589-1 · IHCIHC analysis of RAB1B using anti-RAB1B antibody (A04589-1). RAB1B was detected in paraffin-embedded section of human breast cancer tissue. H
A04589-1 · IFIF analysis of RAB1B using anti-RAB1B antibody (A04589-1). RAB1B was detected in immunocytochemical section of T-47D cells. Enzyme antigen r
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000174903-RAB1B/tissue/cerebral+cortex#imid_17765643
HPA · DuodenumHuman Protein Atlas IHC, Duodenum. Source: https://www.proteinatlas.org/ENSG00000174903-RAB1B/tissue/duodenum#imid_17765560
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000174903-RAB1B/tissue/colon#imid_17765553
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000174903-RAB1B/tissue/liver#imid_17765562
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody CAB010225; green = RAB1B, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody CAB010225; green = RAB1B, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for RAB1B IHC & IF
🧪Run duodenum first and require staining in its glandular cells (HPA: High in duodenal glandular cells). Run adipose tissue as the negative comparison (HPA: Not detected in adipocytes); on the duodenum slide, use non-glandular cells to assess background, but do not assume they are RAB1B-negative because their status is not given in the supplied HPA rows.
Positive control tissue: Duodenum (Glandular cells, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show RAB1B in A-431, U-251MG, U2OS, with annotated localisation: Golgi apparatus (supported) (HPA subcellular).
Technical controls: Include a no-primary (secondary-only) control, a species- and clonality-matched rabbit IgG isotype control, and a RAB1B knockout biological control where available (caption: rabbit anti-RAB1B primary; standard IHC controls). Quench endogenous peroxidase and check for endogenous biotin signal in duodenum when using the caption’s biotin-based SABC/DAB detection (caption: SABC/DAB detection; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected A04589-1 paraffin-section caption does not state a fixative (caption: fixative not stated). The reported IHC procedure uses heat-mediated retrieval in EDTA at pH 8.0; whether that retrieval is required, or whether frozen sections are easier, is unreported (caption: EDTA retrieval). ICC-IF images support assessing Golgi and endoplasmic reticulum localization, but do not establish that IF is easier than paraffin IHC (HPA: supported Golgi and endoplasmic reticulum localization); check duodenal sections for endogenous biotin signal with the reported SABC detection (caption: SABC detection; standard IHC practice).
HPA tissue IHC evidence for RAB1B
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Medium consistency between antibody staining and RNA expression data. Caution, targets protein from more than one gene.). 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 | Glandular cells | High | Protein (IHC) | HPA → |
| Epididymis | Glandular cells | High | Protein (IHC) | HPA → |
| Ovary | Follicle cells | High | Protein (IHC) | HPA → |
| Placenta | Decidual cells | High | Protein (IHC) | HPA → |
| Small intestine | Glandular 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 → |
| Caudate | Glial cells | Not detected | Protein (IHC) | HPA → |
| Esophagus | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
| Parathyroid gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced RAB1B IHC Tips
Troubleshoot RAB1B chromogenic IHC by checking retrieval, cytoplasmic staining patterns, cell identity, and controls before comparing staining across sections (UniProt Q9H0U4; HPA tissue IHC).
Which retrieval conditions should I try first for weak RAB1B staining?
Start with heat-mediated retrieval in EDTA at pH 8.0 for the catalog antibody (datasheet A04589-1). The documented paraffin-section example then used 10% goat serum and 2 µg/ml primary antibody overnight at 4°C (datasheet A04589-1). If staining remains weak, compare a citrate buffer at pH 6.0 as a fallback on matched sections, keeping detection and exposure to DAB constant (standard IHC practice). Judge any gain against increased background and tissue damage, using a no-primary control and the same cell type across sections (standard IHC practice).
Could fixation explain variable staining between paraffin sections?
Target-specific sensitivity of RAB1B staining to fixation is unknown from the supplied evidence; the selected tissue-IHC caption identifies a paraffin section but does not report its fixative (datasheet A04589-1). Record the actual fixative, fixation duration, processing history, and section age for each sample before attributing differences to antigen abundance (standard IHC practice). Compare matched sections processed together, starting with EDTA retrieval at pH 8.0 and 2 µg/ml primary antibody overnight at 4°C (datasheet A04589-1). If staining differs, examine morphology and background alongside the signal, then adjust processing conditions systematically rather than assigning a RAB1B-specific fixation effect (standard IHC practice).
Should RAB1B staining look diffuse or concentrated near the nucleus?
Assess staining primarily in the cytoplasm, allowing perinuclear enrichment consistent with RAB1B membrane trafficking around the endoplasmic reticulum and Golgi (UniProt Q9H0U4 localisation; HPA subcellular). HPA reports general cytoplasmic tissue staining and a supported Golgi location with an additional endoplasmic reticulum location in cellular imaging (HPA tissue IHC; HPA subcellular). Because GDP-bound RAB1B can associate with cytoplasmic GDI, a diffuse component alone does not establish mislocalisation (UniProt Q9H0U4 localisation). Compare the pattern in viable cells with adjacent controls, and treat isolated nuclear or extracellular DAB as suspicious until specificity and section quality are checked (standard IHC practice).
How do I assess whether the antibody recognises the intended RAB1B epitope?
The supplied record lists one 201-amino-acid RAB1B chain and no annotated isoforms, but it does not locate this antibody’s epitope (UniProt Q9H0U4; datasheet A04589-1). RAB1B has no transmembrane segment, while its membrane association and C-terminal processing make epitope accessibility a question to test rather than assume (UniProt Q9H0U4 topology and processing). Keep retrieval at EDTA pH 8.0 as the documented starting condition and compare staining after controlled retrieval changes on adjacent sections (datasheet A04589-1; standard IHC practice). An independent antibody with a disclosed, distinct epitope and an appropriate loss-of-target control would strengthen attribution of the chromogenic signal to RAB1B (standard IHC practice).
How should I validate a multiplex IF follow-up to the tissue IHC result?
Use a cell-type marker alongside RAB1B when examining glandular cells, which show high tissue-IHC staining in duodenum and small intestine (HPA tissue IHC). Choose spectrally separated fluorophores and inspect unstained tissue in each channel, since tissue autofluorescence can obscure weak IF signals (standard IF practice). RAB1B lacks a transmembrane segment and occurs in cytoplasm and on intracellular membranes, but the antibody epitope’s orientation is unreported; test mild permeabilisation against a matched untreated condition (UniProt Q9H0U4 topology and localisation; standard IF practice). Optimise IF primary concentration independently: the 2 µg/ml overnight condition documents paraffin-section chromogenic IHC only (datasheet A04589-1).
What should I check when DAB staining obscures the cytoplasmic pattern?
Run a no-primary section to identify signal from detection reagents, and include a peroxidase-blocking step before DAB development (standard chromogenic IHC practice). The documented detection sequence uses a biotinylated goat anti-rabbit secondary for 30 minutes at 37°C, followed by a streptavidin-biotin complex and DAB (datasheet A04589-1). If background is widespread, check the 10% goat-serum block, wash stringency, primary concentration, and detection incubation on matched sections (datasheet A04589-1; standard IHC practice). Evaluate endogenous biotin when using this detection chemistry, and distinguish granular cytoplasmic staining from precipitate at folds or section edges (standard IHC practice).
How can I compare RAB1B staining across tissue sections reliably? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and viable tissue region before scoring, then apply identical retrieval, detection, imaging, and DAB development across the comparison (standard IHC practice). For cellular staining, calculate an H-score as 1 × % weak + 2 × % moderate + 3 × % strong, yielding 0–300; record the percentage of positive cells separately (standard IHC practice). Normalise counts to the number of evaluable cells in the same compartment, or report stained-cell density per mm² of viable tissue when area is the sampling unit (standard IHC practice). Keep glandular and other cell populations separate because HPA reports differing RAB1B tissue-IHC levels across cell types (HPA tissue IHC).
When is an apparent positive RAB1B stain likely to be artefactual?
A credible result has cytoplasmic staining, potentially enriched around the nucleus, in intact cells; RAB1B is linked to cytoplasm and intracellular membrane compartments (HPA tissue IHC; UniProt Q9H0U4 localisation). Check cell identity before calling a discordance: HPA reports high staining in duodenal glandular cells but no detected staining in adipocytes or skeletal-muscle myocytes (HPA tissue IHC). Signal limited to necrotic areas, folds, or section edges warrants repeat assessment on intact tissue with a no-primary control (standard IHC practice). Residual endogenous peroxidase or detection-system background can produce DAB signal, while HPA cautions that its tissue antibody may detect proteins from more than one gene (standard IHC practice; HPA tissue IHC reliability).
Boster reagents
Best RAB1B / Ras-related protein Rab-1B IHC Antibodies
A04589-1 has IHC data from human paraffin sections and IF/ICC data from T-47D cells; listed reactivity includes human, mouse and rat (catalog image captions; catalog reactivity).
Real IHC data
Anti-RAB1B Antibody ®
Cat # A04589-1
A04589-1 is shown by IHC in paraffin sections of human prostate, breast and ovarian cancer and placenta (A04589-1 IHC captions). A04589-1 is shown by IF/ICC in T-47D cells and lists human, mouse and rat reactivity (A04589-1 IF caption; catalog reactivity).
Which to pick: For tissue IHC, choose A04589-1: its images document paraffin sections with EDTA pH 8 heat retrieval; the fixative is unreported (A04589-1 IHC captions). For IF/ICC, A04589-1 has a T-47D cell image and lists both applications (A04589-1 IF caption; catalog applications). For mouse or rat work, A04589-1 lists reactivity with both species, although the supplied IHC and IF images use human samples; its host is rabbit and clonality is unreported (catalog reactivity; catalog image captions; catalog host and clone).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9H0U4 (RAB1B_HUMAN, Ras-related protein Rab-1B).
- Human Protein Atlas. RAB1B tissue IHC expression (reliability: Approved).
- Human Protein Atlas. RAB1B subcellular location (ICC-IF): Mainly localized to the Golgi apparatus. In addition localized to the endoplasmic reticulum..
- Human Protein Atlas. RAB1B antibody validation summary (2 antibodies).
- Identification of Endoplasmic Reticulum Stress-Related Genes in Osteoporosis Pathogenesis. Mediators of inflammation 2025 — PMC12413945.
- Overexpression of Rab1B and MMP9 predicts poor survival and good response to chemotherapy in patients with colorectal cancer. Aging 2017 — PMC5391239.
- LINC00173 facilitates tumor progression by stimulating RAB1B-mediated PA2G4 and SDF4 secretion in nasopharyngeal carcinoma. Molecular oncology 2023 — PMC9980309.
- Vibrio MARTX toxin processing and degradation of cellular Rab GTPases by the cytotoxic effector Makes Caterpillars Floppy. Proceedings of the National Academy of Sciences of the United States of America 2024 — PMC11194500.
- PubMed PMID:11230166 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:15489334 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for RAB1B (Ras-related protein Rab-1B). Expected localisation General cytoplasmic staining observed in tissue (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A04589-1). Validated IHC antibody: A04589-1 at 2μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Duodenum (Glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human prostate cancer tissue; fixative not specified (datasheet A04589-1); 2. Fixation: Image fixative and duration unreported (datasheet A04589-1); 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 A04589-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A04589-1); 8. Primary antibody: Rabbit anti-RAB1B, 2μg/ml (datasheet A04589-1); 9. Primary incubation: Overnight at 4 °C (datasheet A04589-1). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); Caveat: Antibody may target proteins from more than one gene (HPA tissue IHC); Isoform / epitope: No annotated isoforms or cleaved chains (UniProt); Regulation: Low tissue specificity; regulation unreported (HPA tissue IHC). Evidence: UniProt Q9H0U4, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the Golgi apparatus. In addition localized to…, Datasheet A04589-1, PMC5391239, PMC9980309. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/RAB1B/immunohistochemistry-ihc-guide.