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RAB5C / Ras-related protein Rab-5C · IHC design guide
Design Immunohistochemistry for RAB5C
Plan paraffin section RAB5C IHC around the cytoplasmic tissue pattern (HPA tissue IHC), while treating early endosome membrane localization as a molecular expectation (UniProt). The catalog antibody has an IHC dilution of 1:100–1:300 (datasheet A05148); testis pachytene spermatocytes show high staining (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
RAB5C 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 tissue stain (HPA tissue IHC); early endosome membrane expected (UniProt) | |
| Staining pattern | High cytoplasmic staining in pachytene spermatocytes (HPA tissue IHC) | |
| Antigen retrieval | Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A05148) | |
| Positive control | Testis+4 more · see all | |
| Negative control | Adipose tissue+1 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 | Staining and RNA expression show low consistency (HPA tissue IHC) | |
| Regulation | No expression regulator annotated (UniProt) | |
| Isoform / epitope | 2 isoforms; no transmembrane segment; check epitope coverage (UniProt) |
Section 1
Recommended RAB5C IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol (datasheet A05148) with published RAB5C protocols for spinal cord sections (PMC4798752) and breast cancer paraffin sections (PMC12183389).
| Sample | Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A05148) |
| Fixation | Image fixative and duration unreported (datasheet A05148); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Tris-EDTA pH 9.0 (datasheet A05148); 20 min, 95–100 °C (standard) |
| 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-RAB5C, 1:100 - 1:300 (datasheet A05148) |
| 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 | RAB5C-positive staining in pachytene spermatocytes of testis (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several tissues. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated Tris-EDTA pH 9.0 retrieval for the catalog antibody (datasheet A05148); the published protocols provide other retrieval conditions (PMC4798752; PMC12183389).
Section 2
What Is the Expected RAB5C Staining Pattern?
RAB5C is an early endosome and cell membrane associated protein without a transmembrane segment (UniProt P51148). In paraffin sections, expect cytoplasmic staining in several tissues, strongest among the supplied examples in testis pachytene spermatocytes (HPA tissue IHC: High). HPA rates the tissue IHC antibody Approved but reports low consistency between staining and RNA expression; interpret intensity alongside morphology and controls (HPA tissue IHC).
| Cytoplasmic staining in pachytene spermatocytes; other listed positive cells stain less strongly. | This matches the reported High signal in testis and Medium signal in several glandular, hematopoietic, respiratory epithelial and neuronal cell populations (HPA tissue IHC). A granular cytoplasmic appearance is plausible for an endosome associated protein, but the HPA tissue profile specifies cytoplasmic expression, not a required punctate IHC pattern (HPA tissue IHC; UniProt P51148). |
| Signal appears predominantly nuclear, or forms a uniform strong rim around most cells. | Those patterns do not match HPA’s cytoplasmic tissue profile or its endosomal IF localization (HPA tissue IHC; HPA subcellular). Review morphology, counterstain and detection controls before scoring them as RAB5C. UniProt also lists the cell membrane, so a localized membrane component alone is not grounds to reject an otherwise credible result (UniProt P51148). |
| Strong staining appears in adipocytes or smooth muscle cells. | HPA reports RAB5C as Not detected in those cell types (HPA tissue IHC). Check whether the color is confined to the expected cells, then compare a reagent control for nonspecific binding or endogenous detection activity (general IHC practice). HPA’s low staining–RNA consistency limits how confidently any single discrepancy can be assigned to cross-reactivity (HPA tissue IHC). |
| Broad, diffuse color obscures cell borders and tissue structure. | This does not provide a scorable cytoplasmic cell pattern (general IHC practice; HPA tissue IHC). Background from antibody binding, detection reagents or residual endogenous activity can mimic widespread positivity in chromogenic IHC (general IHC practice). Assess an appropriate reagent control before comparing tissue intensities; diffuse color alone cannot establish RAB5C localization. |
| No signal appears in the testis pachytene spermatocytes used as a positive reference. | That conflicts with the supplied High HPA observation (HPA tissue IHC). First confirm that the relevant cells are present and preserved, then check the staining run and its controls (general IHC practice). A failed positive reference makes a negative result elsewhere uninterpretable; HPA’s Approved rating does not guarantee that every specimen or run will stain (HPA tissue IHC). |
💡Expected RAB5C appearanceCall a result positive when identifiable pachytene spermatocytes show strong cytoplasmic chromogenic staining, with weaker staining possible in other HPA listed positive cells; predominant nuclear color, indiscriminate tissue wide color or strong adipocyte and smooth muscle staining warrants control review (HPA tissue IHC; general IHC practice).
| Compartment and topology | UniProt places RAB5C at early endosome and cell membranes and annotates no transmembrane segment (UniProt P51148). HPA describes tissue staining as cytoplasmic (HPA tissue IHC). Score the cell and cytoplasmic compartment first; do not require a sharply outlined membrane or individually resolved endosomes in a chromogenic section (general IHC practice). |
| Reference cell intensity | Pachytene spermatocytes are High; the supplied adrenal, appendix and breast glandular cells, bone marrow hematopoietic cells, bronchial respiratory epithelial cells, caudate neuronal cells and cerebellar granular layer cells are Medium (HPA tissue IHC). Adipocytes and smooth muscle cells are Not detected in HPA’s examples; these observations guide comparisons, not universal thresholds (HPA tissue IHC). |
| IHC evidence strength | The listed IHC antibody HPA003426 is Approved, while HPA explicitly reports low consistency between antibody staining and RNA expression (HPA antibodies; HPA tissue IHC). Treat agreement with the observed cell distribution as supportive evidence, and investigate major mismatches with controls and morphology instead of interpreting an Approved label as definitive specificity. |
| IF/ICC cross-check: what should appear? | HPA reports endosomal localization in ICC-IF, with an Enhanced subcellular result, and lists A-549, HEK293, U2OS and HeLa images (HPA subcellular). That supports endosomal IF signal as a localization cross-check. The listed ICC Enhanced antibody is HPA004167, whereas the listed IHC Approved antibody is HPA003426; their validation labels should not be exchanged (HPA antibodies). |
| Antigen retrieval and detection | Target-specific fixation effects are not established by the supplied assay evidence. Verify with a matched IHC source before attributing a result to fixation. |
| Situation | Likely cause | Next action |
|---|---|---|
| Testis positive reference is blank. | The sampled section may lack identifiable pachytene spermatocytes, or the staining run may have failed (HPA tissue IHC; general IHC practice). | Locate the relevant cells on the counterstained section and inspect run controls; then review the established retrieval, primary-antibody and detection steps (general IHC practice). Do not score other blank tissues as negative until the positive reference works. |
| Adipocytes or smooth muscle cells stain strongly. | This conflicts with HPA’s Not detected observations; nonspecific antibody binding or endogenous chromogenic activity is possible (HPA tissue IHC; general IHC practice). | Compare cell morphology with a suitable reagent control and check blocking of endogenous detection activity where the detection system requires it (general IHC practice). Reassess specificity before calling those cells RAB5C positive. |
| A strong nuclear pattern dominates the section. | HPA reports cytoplasmic tissue staining, while its IF localization is endosomal (HPA tissue IHC; HPA subcellular). Nuclear color may reflect background or a scoring error (general IHC practice). | Use the counterstain to distinguish nucleus from adjacent cytoplasm, compare the reagent control, and score only a credible cell associated pattern (general IHC practice). |
| Color is diffuse across tissue and obscures cellular detail. | Nonspecific reagent signal, inadequate washing or endogenous detection activity can create background in chromogenic IHC (general IHC practice). | Inspect the reagent control, tissue preservation and washing steps; adjust the general staining workflow only in light of those controls (general IHC practice). Do not convert diffuse color into a positive RAB5C score. |
| An HPA Medium cell type is negative in a particular specimen. | The HPA values describe observed examples, and the tissue IHC entry reports low staining–RNA consistency (HPA tissue IHC). A local negative result alone does not identify its cause. | Confirm the intended cell population is present, check the testis positive reference and run controls, and document the specimen level discrepancy (HPA tissue IHC; general IHC practice). Avoid assigning a target-specific fixation effect without evidence. |
| Endosomal IF and chromogenic IHC appear different. | IF resolves subcellular structures more clearly than routine chromogenic sections (general IHC practice). The supplied IF and IHC validation labels also belong to different antibodies (HPA antibodies). | Judge paraffin IHC against its cytoplasmic tissue pattern and cell types, and use HPA’s endosomal IF localization as a separate cross-check (HPA tissue IHC; HPA subcellular). Review each assay’s controls before treating the difference as biological. |
Experiment evidence
IHC & IF images showing RAB5C staining
A05148 · IHCImmunohistochemical analysis of paraffin-embedded human tonsil. 1, Antibody was diluted at 1:200(4° overnight). 2, Tris-EDTA,pH9.0 was used
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000108774-RAB5C/tissue/cerebral+cortex#imid_1288684
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000108774-RAB5C/tissue/colon#imid_1265858
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000108774-RAB5C/tissue/liver#imid_1265843
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000108774-RAB5C/tissue/kidney#imid_1265860
HPA · ICC-IF A-549Human Protein Atlas immunofluorescence, A-549, antibody HPA004167; green = RAB5C, blue = nucleus, red = microtubules.
HPA · ICC-IF A-549Human Protein Atlas immunofluorescence, A-549, antibody HPA004167; green = RAB5C, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for RAB5C IHC & IF
🧪Run testis first and look for staining in pachytene spermatocytes (HPA: High). Run adipose tissue as the negative and expect adipocytes to show no detectable staining (HPA: Not detected); on the testis slide, treat cells outside the identified positive population as an internal background check, without assuming they are RAB5C-negative (HPA: High in pachytene spermatocytes only).
Positive control tissue: Testis (Pachytene spermatocytes, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show RAB5C in A-549, HEK293, U2OS, HeLa BAC 5950, HeLa , with annotated localisation: Endosomes (enhanced) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control and a nonimmune isotype control matched to the primary antibody’s host and class; match clonality where applicable (standard IHC practice). Confirm specificity with RAB5C knockout material or a peptide competition control if the immunizing peptide is available, and block endogenous peroxidase before chromogenic detection in testis sections (standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected A05148 paraffin-section caption does not state a fixative (selected-SKU tissue-IHC caption: fixative unreported). The caption uses Tris-EDTA at pH 9.0 for retrieval in tonsil, so retrieval conditions require validation in testis (selected-SKU tissue-IHC caption: tonsil); the supplied evidence does not establish whether frozen sections or IF are easier, though HPA documents endosomal localization by ICC-IF (HPA subcellular: endosomes). No testis-specific artefact is reported in the supplied evidence (HPA tissue rows; selected-SKU tissue-IHC caption).
HPA tissue IHC evidence for RAB5C
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Low consistency between antibody staining and RNA expression data.). Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Testis | Pachytene spermatocytes | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Medium | Protein (IHC) | HPA → |
| Breast | Glandular cells | Medium | Protein (IHC) | HPA → |
Section 3
Advanced RAB5C IHC Tips
Use compartment, cell identity, and processing controls together when assessing RAB5C staining in paraffin sections (UniProt P51148 localization; HPA tissue IHC).
Which retrieval conditions should I start with for RAB5C in paraffin sections?
Use heat-mediated Tris-EDTA at pH 9.0 for paraffin-section antigen retrieval (datasheet A05148). Start with the catalog antibody at 1:200 for 4°C overnight, and compare staining with a matched section processed without retrieval (caption A05148; standard IHC control). RAB5C associates with early endosome membranes and has no transmembrane segment, so assess intracellular staining in well-preserved cells rather than judging retrieval by diffuse color alone (UniProt P51148 localization and topology). If staining remains weak, optimize heating within the Tris-EDTA method before trying another buffer as a fallback, while keeping antibody dilution and chromogen development constant (standard IHC optimization).
How should I investigate variable RAB5C staining across differently fixed paraffin specimens?
Target-specific fixation sensitivity is unknown, and the paraffin-embedded tonsil caption does not state the fixative (caption A05148). Record each specimen’s fixative and fixation duration, then compare sections using Tris-EDTA at pH 9.0 and the antibody at 1:200 (datasheet A05148; standard IHC practice). Match section thickness, retrieval heating, and chromogen development, and examine preserved morphology alongside staining intensity when evaluating variation (standard IHC practice). If fixation histories differ, treat intensity comparisons as provisional and use a similarly processed specimen series before assigning the difference to RAB5C expression (standard IHC interpretation).
What staining pattern should I expect for RAB5C in chromogenic IHC?
Look for cytoplasmic staining with an intracellular punctate component consistent with early endosomes, while allowing for some membrane-associated signal (HPA: cytoplasmic tissue expression and endosomal localization; UniProt P51148 localization). RAB5C has no transmembrane segment, so a continuous cell-outline pattern alone needs further scrutiny against morphology and controls (UniProt P51148 topology; standard IHC interpretation). Compare cells within the same section: pachytene spermatocytes are reported as high, whereas adipocytes and smooth muscle cells are reported as not detected (HPA tissue IHC). The protein was also identified in melanosome fractions, but that finding alone does not establish a distinctive melanosomal chromogenic pattern in the section under study (UniProt P51148).
Could isoforms or epitope accessibility explain discordant RAB5C staining?
RAB5C has 2 annotated isoforms, but the supplied antibody caption does not identify its epitope or establish isoform coverage (UniProt P51148 isoforms; caption A05148). Check the antibody’s epitope documentation before treating differences between specimens as changes in total RAB5C, and retain matched processing conditions during comparison (standard IHC interpretation). Ser-85 is a reported phosphorylation site, and phosphorylation there disrupts interactions with several binding partners; its effect on this antibody’s binding is unknown (UniProt P51148). Because RAB5C lacks a transmembrane segment, use cellular morphology and endosomal distribution to assess staining without assuming that membrane association defines the antibody’s epitope (UniProt P51148 topology and localization).
How can I use IF to check a questionable RAB5C IHC pattern?
Use IF as a separate localization check, comparing RAB5C puncta with an independently validated endosomal marker and a marker for the expected cell type (HPA: enhanced endosomal localization; standard IF practice). For testis, a validated pachytene-spermatocyte marker can help assess the cell population reported as high in tissue IHC (HPA: testis, pachytene spermatocytes high). Choose spectrally separated fluorophores and assess unstained tissue autofluorescence before interpreting dim puncta (standard IF practice). RAB5C has no transmembrane segment, but the supplied evidence does not map this antibody’s epitope to a membrane side; optimize permeabilisation against antibody access and preservation of endosomal puncta (UniProt P51148 topology; standard IF practice).
How do I distinguish RAB5C signal from chromogenic background?
Start with the documented 1:200 primary dilution and 4°C overnight incubation, then compare a matched section without primary antibody (caption A05148; standard IHC control). In a peroxidase and DAB workflow, include a peroxidase block and inspect the control for endogenous enzyme activity; these are general IHC measures, not RAB5C-specific validation (standard chromogenic IHC practice). Review wash quality, nonspecific secondary binding, and chromogen development if color appears broadly across compartments or tissue edges (standard IHC troubleshooting). Because RAB5C is associated with early endosomes, accept diffuse staining only with supporting controls and morphology, rather than calling every cytoplasmic deposit specific (UniProt P51148 localization; standard IHC interpretation).
How should I quantify RAB5C staining across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and region before scoring, and keep retrieval at Tris-EDTA pH 9.0 with antibody at 1:200 across the comparison (datasheet A05148; standard IHC practice). For intensity, use a consistent H-score or report the percentage of positive cells; for discrete positive cells, report density per mm² of viable tissue (standard IHC scoring). Normalize cell counts to the number of evaluable cells, or staining density to the measured viable area, while excluding folds and necrosis by a prespecified rule (standard IHC quantification). Report cytoplasmic and punctate staining consistently, and stratify by cell type because HPA reports different staining levels across cell populations (HPA tissue IHC).
When should I doubt an apparent RAB5C-positive IHC result?
A plausible result places staining in cytoplasm with an endosomal component, consistent with the reported tissue pattern and subcellular localization (HPA tissue IHC and subcellular). Recheck a strong signal confined to adipocytes or smooth muscle cells, which HPA reports as not detected, while recognizing that these reference patterns do not decide every specimen’s status (HPA tissue IHC). Edge staining, necrotic deposits, or color persisting without primary antibody can indicate processing artefact or endogenous enzyme activity in a peroxidase workflow (standard chromogenic IHC controls). Interpret discordance cautiously: HPA labels its tissue IHC approved but reports low consistency between antibody staining and RNA expression data (HPA reliability description).
Boster reagents
Best RAB5C / Ras-related protein Rab-5C IHC Antibodies
Anti-RAB5C antibodies list IHC and IF/ICC applications in human, mouse, and rat; A05148 includes a human paraffin-section IHC image (catalog: applications/reactivity; A05148 IHC caption).
Real IHC data
Anti-Ras-related protein Rab-5C RAB5C Antibody
Cat # A05148
A05148 lists IHC and IF/ICC for human, mouse, and rat, with an IHC image of paraffin-embedded human tonsil (catalog: applications/reactivity; A05148 IHC caption). M05148-1 lists IHC and ICC/IF for human, mouse, and rat; no IHC or IF image caption is supplied for it (catalog: applications/reactivity; M05148-1 image alts).
Which to pick: For tissue IHC, pick A05148 if a paraffin-section example matters: its human tonsil caption reports Tris-EDTA retrieval at pH 9.0 and primary antibody at 1:200, but does not report the fixative (A05148 IHC caption). For IF/ICC, pick M05148-1 if you prefer clone 28R55; A05148 is polyclonal, and both list IF/ICC without an IF image caption (catalog: clone/applications/dilution_raw; image alts). Both list mouse and rat reactivity, while the supplied tissue IHC image is human only (catalog: reactivity; A05148 IHC caption; M05148-1 image alts).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P51148 (RAB5C_HUMAN, Ras-related protein Rab-5C).
- Human Protein Atlas. RAB5C tissue IHC expression (reliability: Approved).
- Human Protein Atlas. RAB5C subcellular location (ICC-IF): Localized to the endosomes..
- Human Protein Atlas. RAB5C antibody validation summary (2 antibodies).
- Experimental Neuromyelitis Optica Induces a Type I Interferon Signature in the Spinal Cord. PloS one 2016 — PMC4798752.
- Extracellular Vesicle Proteome Analysis Improves Diagnosis of Recurrence in Triple-Negative Breast Cancer. Journal of extracellular vesicles 2025 — PMC12183389.
- PubMed PMID:8646882 — UniProt-cited evidence.
- PubMed PMID:7951316 — UniProt-cited evidence.
- PubMed PMID:10768959 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for RAB5C (Ras-related protein Rab-5C). Expected localisation Cytoplasmic tissue stain (HPA tissue IHC); early endosome membrane expected (UniProt). Antigen retrieval: Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A05148). Validated IHC antibody: A05148 at 1:100 - 1:300 (the product's own IHC validation image is shown). Controls (HPA): positive Testis (Pachytene spermatocytes); negative Adipose tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A05148); 2. Fixation: Image fixative and duration unreported (datasheet A05148); 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: Tris-EDTA pH 9.0 (datasheet A05148); 20 min, 95–100 °C (standard); 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-RAB5C, 1:100 - 1:300 (datasheet A05148); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); Caveat: Staining and RNA expression show low consistency (HPA tissue IHC); Isoform / epitope: 2 isoforms; no transmembrane segment; check epitope coverage (UniProt); Regulation: No expression regulator annotated (UniProt). Evidence: UniProt P51148, HPA tissue IHC · Approved, HPA ICC-IF · endosomes., Datasheet A05148, PMC4798752, PMC12183389. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/RAB5C/immunohistochemistry-ihc-guide.