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CALB1 / Calbindin · IHC design guide
Design Immunohistochemistry for CALB1
Plan CALB1 staining in paraffin sections using cytoplasmic Purkinje cell and renal tubule staining as reference patterns (HPA tissue IHC). The guide covers fixation consistency, antibody dilution, detection and interpretation.
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
CALB1 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 in Purkinje cells and renal tubules (HPA tissue IHC) | |
| Staining pattern | Purkinje cells and renal tubules show cytoplasmic staining (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet PB9045) | |
| Positive control | Cerebellum+2 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 | Low cortical neuronal staining may be mistaken for negative (HPA tissue IHC) | |
| Regulation | Regulation is not established (UniProt) | |
| Isoform / epitope | 2 isoforms; epitope differences are unspecified (UniProt) |
Section 1
Recommended CALB1 IHC & IF Protocols
The catalog antibody protocol uses EDTA pH 8.0 retrieval (datasheet PB9045). The published protocols below cover paraffin sections and chromogenic staining of frozen sections (PMC3338865; PMC4105481; PMC6738605).
| Sample | Paraffin-embedded mouse kidney tissue; fixative not specified (datasheet PB9045) |
| Fixation | Image fixative and duration unreported (datasheet PB9045); 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 PB9045); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet PB9045) |
| Primary antibody | Rabbit anti-CALB1, 0.5-1μg/ml recommended; image 2 μg/ml (datasheet PB9045) |
| Primary incubation | Overnight at 4 °C (datasheet PB9045) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet PB9045) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | CALB1-positive staining in processes in granular layer of cerebellum (HPA tissue IHC: High). HPA tissue profile: Selective cytoplasmic expression in Purkinje cells and renal tubules. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for the catalog antibody (datasheet PB9045); the published paraffin-section protocol uses Tris/EDTA pH 9 (PMC3338865).
Section 2
What Is the Expected CALB1 Staining Pattern?
CALB1 stains Purkinje cell and renal tubule cytoplasm (HPA: Enhanced); it has no TM segment (UniProt P05937).
| Purkinje cytoplasm, cerebellar processes and distal tubules stain (HPA: tissue IHC). | Matches the selective tissue pattern; processes and distal tubules are High (HPA: tissue IHC). |
| Nuclear-only or membrane-rim-only staining. | Disagrees with the cytoplasmic tissue pattern (HPA: tissue IHC); check specificity. |
| Adipocytes stain in adipose tissue. | Unexpected (HPA: Not detected); assess cross-reactivity and endogenous detection activity. |
| Chromogen appears across cells and empty areas. | Suggests background; inspect no-primary and blocking controls (general IHC practice). |
| No signal in kidney distal tubules (HPA: High). | Review retrieval, primary dilution and detection controls (general IHC practice). |
💡Expected CALB1 appearancePurkinje cytoplasm and strong cerebellar process/distal-tubule staining (HPA); adipocyte signal is suspect (HPA).
| Tissue context (HPA: tissue IHC) | Cerebellar processes and distal tubules are High; caudate neurons are Medium (HPA). |
| Topology (UniProt P05937) | No transmembrane segment; membrane-rim-only IHC conflicts with the cytoplasmic pattern (HPA). |
| Antibody validation (HPA: antibodies) | All three listed antibodies have Enhanced IHC validation (HPA: antibodies). |
| IF/ICC pattern? (HPA: subcellular) | HPA reports approved vesicle localisation in ICC-IF; assess it separately from tissue IHC (HPA). |
| Situation | Likely cause | Next action |
|---|---|---|
| No distal-tubule signal (HPA: High). | Assay failure is possible (general IHC practice). | Check retrieval, primary dilution and detection controls (general IHC practice). |
| Nuclear-only staining. | Conflicts with cytoplasmic tissue expression (HPA: tissue IHC). | Compare with positive tissue and no-primary controls (general IHC practice). |
| Adipocytes stain in adipose tissue. | Possible cross-reactivity or endogenous detection activity (HPA: Not detected). | Run no-primary and endogenous-activity controls (general IHC practice). |
| Diffuse chromogen across the section. | Background from detection or insufficient blocking is possible (general IHC practice). | Review blocking and wash steps; inspect no-primary control (general IHC practice). |
| IF vesicles differ from cytoplasmic tissue IHC. | The assays have distinct HPA localisation reports (HPA: tissue IHC; subcellular). | Interpret ICC-IF vesicles within its own assay controls (HPA: subcellular; general IF practice). |
Experiment evidence
IHC & IF images showing CALB1 staining
PB9045 · IHCIHC analysis of Calbindin using anti-Calbindin antibody (PB9045). Calbindin was detected in a paraffin-embedded section of mouse kidney tiss
PB9045 · IHCIHC analysis of Calbindin using anti-Calbindin antibody (PB9045). Calbindin was detected in a paraffin-embedded section of rat kidney tissue
A03047 · IHCIHC analysis of Calbindin using anti-Calbindin antibody (A03047). Calbindin was detected in paraffin-embedded section of rat kidney tissue.
A03047 · IHCIHC analysis of Calbindin using anti-Calbindin antibody (A03047). Calbindin was detected in paraffin-embedded section of mouse brain tissue.
A03047 · IFIF analysis of Calbindin using anti-Calbindin antibody (A03047). Calbindin was detected in a paraffin-embedded section of rat cerebellum tis
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000104327-CALB1/tissue/cerebral+cortex#imid_18719052
HPA · CerebellumHuman Protein Atlas IHC, Cerebellum. Source: https://www.proteinatlas.org/ENSG00000104327-CALB1/tissue/cerebellum#imid_18719055
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000104327-CALB1/tissue/colon#imid_18718978
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000104327-CALB1/tissue/liver#imid_18718979
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA023099; green = CALB1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA023099; green = CALB1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for CALB1 IHC & IF
🧪Run kidney first: distal tubules must stain (HPA: High in kidney distal tubules). Use adipose tissue adipocytes as a negative tissue (HPA: Not detected in adipocytes); on the kidney slide, assess adjacent cells outside distal tubules for background staining without assuming they are CALB1-negative (HPA: High in distal tubules).
Positive control tissue: Cerebellum (Processes in granular layer, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show CALB1 in A-431, U-251MG, U2OS, with annotated localisation: Vesicles (approved) (HPA subcellular).
Technical controls: Include no-primary (secondary-only), a rabbit IgG isotype control matched to the primary antibody’s clonality where known, and CALB1-knockout tissue as a biological negative (selected PB9045 caption: rabbit primary). Block endogenous peroxidase in kidney sections before HRP/DAB detection (selected PB9045 caption: kidney section with HRP/DAB; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected PB9045 kidney caption does not state the fixative (selected PB9045 caption: fixative unreported). That paraffin-section example uses heat retrieval in EDTA at pH 8.0, but does not establish that retrieval is required (selected PB9045 caption: heat-mediated EDTA retrieval). No supplied comparison establishes that frozen sections or IF are easier; for kidney HRP/DAB IHC, endogenous peroxidase can produce background (selected PB9045 caption: kidney HRP/DAB; standard IHC practice).
HPA tissue IHC evidence for CALB1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High 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 |
|---|---|---|---|---|
| Cerebellum | Processes in granular layer | High | Protein (IHC) | HPA → |
| Kidney | Distal tubules | High | Protein (IHC) | HPA → |
| Caudate | Neuronal cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced CALB1 IHC Tips
Troubleshoot CALB1 staining by checking retrieval, cellular pattern and controls before comparing signal across paraffin sections.
What retrieval should I try first when CALB1 staining is weak?
Start with heat-mediated antigen retrieval in EDTA at pH 8.0 for paraffin sections (datasheet PB9045). The catalog antibody produced chromogenic staining in mouse kidney after this retrieval, with primary antibody at 2 μg/ml overnight at 4°C (datasheet PB9045). If signal remains weak, check section adhesion, heating consistency and reagent performance on a known positive section before changing retrieval conditions (standard IHC practice; HPA: high in kidney distal tubules). Compare any adjusted retrieval side by side with the documented method, because stronger staining alone does not establish improved specificity (standard IHC practice).
How should I troubleshoot a possible fixation effect on CALB1 staining?
CALB1-specific fixation sensitivity is unknown here: the mouse kidney caption identifies a paraffin section but does not state its fixative (datasheet PB9045). Record the fixative and fixation duration for each specimen, then process matched positive-control sections alongside the study sections (standard IHC practice; HPA: high in kidney distal tubules). If staining differs between batches, compare sections with the same retrieval and detection conditions before assigning the difference to fixation (standard IHC practice; datasheet PB9045: EDTA pH 8.0 retrieval). Treat excessive fixation or poor preservation as possibilities to investigate, rather than established CALB1-specific effects (standard IHC practice).
How do I assess a CALB1 pattern that appears in an unexpected compartment?
In tissue IHC, assess whether staining follows the selective cytoplasmic pattern reported for Purkinje cells and renal tubules (HPA: tissue IHC profile). CALB1 buffers cytosolic calcium and has no annotated transmembrane segment, but UniProt does not assign it a subcellular location (UniProt P05937: function, topology and subcellular annotation). The HPA subcellular assay instead reports an approved vesicular location, so record cellular context and assay type when comparing patterns (HPA: subcellular summary and tissue IHC profile). If staining is confined to a membrane outline or appears uniformly nuclear, inspect morphology and controls before scoring it as CALB1 (standard IHC practice; HPA: tissue IHC profile).
Could an unmapped epitope explain inconsistent CALB1 staining across specimens?
CALB1 has 2 listed isoforms, but the supplied antibody caption does not identify its recognized epitope or isoform coverage (UniProt P05937: isoforms; datasheet PB9045). The protein contains 5 annotated EF-hand regions and an N-terminal acetylation site; neither annotation establishes which sequence this antibody recognizes (UniProt P05937: domains and modified residues). Check the antibody documentation for immunogen or epitope mapping before interpreting an absent stain as isoform-specific loss (standard IHC practice). When comparing specimens, retain the same retrieval, antibody concentration and scoring rules, and report isoform attribution as unresolved without direct validation (standard IHC practice; datasheet PB9045: 2 μg/ml).
How can IF help investigate an ambiguous CALB1 chromogenic pattern?
Use IF as a separate localization check, multiplexing CALB1 with an independently validated marker for the expected cell type, such as the renal tubular or Purkinje cell population under study (standard IF practice; HPA: tissue IHC profile). Choose a fluorophore channel after measuring tissue autofluorescence with an unstained control, and include single-label controls to evaluate bleed-through (standard IF practice). Because CALB1 has no annotated transmembrane segment and buffers cytosolic calcium, choose permeabilisation conditions that permit access to intracellular epitopes (UniProt P05937: topology and function; standard IF practice). Interpret IF alongside the paraffin-section IHC pattern without treating the IHC caption as an IF validation (datasheet PB9045: tissue IHC caption).
What should I check when DAB staining appears diffuse throughout the section?
Compare the specimen with a no-primary control, and check whether staining persists after the routine endogenous peroxidase block (standard chromogenic IHC practice). The documented mouse kidney workflow used a peroxidase-conjugated secondary antibody and DAB, so enzyme-related background is a relevant control issue (datasheet PB9045). Review serum blocking, washes and primary concentration against the documented 10% goat serum block and 2 μg/ml primary incubation (datasheet PB9045). Assess background in tissue compartments alongside expected distal-tubule staining; widespread signal in cells without the expected pattern warrants caution (HPA: high in kidney distal tubules; standard IHC practice).
How should I quantify CALB1 staining across kidney sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the compartment before scoring: distal tubules show high CALB1 staining in the tissue IHC profile (HPA: high in kidney distal tubules). For chromogenic sections, report either an H-score combining intensity and percentage of positive cells, or the percentage of positive cells within identified distal tubules (standard IHC quantification practice). Normalize counts to the number of eligible tubular cells or sampled tubular area, and keep section thickness, acquisition and threshold settings consistent across specimens (standard IHC quantification practice). Score matched negative-control sections to set the background threshold, and exclude damaged or poorly preserved regions using a predefined rule (standard IHC quantification practice).
How can I distinguish genuine CALB1 staining from a tissue artefact?
Give most weight to staining in the expected cells and compartment: the tissue profile describes cytoplasmic expression in Purkinje cells and renal tubules, with high signal in kidney distal tubules (HPA: tissue IHC profile). A signal restricted to an unexpected cell population or compartment needs corroboration before being called CALB1 (HPA: tissue IHC profile; standard IHC practice). Inspect section edges and necrotic regions for localized artefacts, and compare no-primary and peroxidase-block controls for endogenous enzyme signal (standard chromogenic IHC practice). Concordance with the documented mouse kidney staining supports interpretation, while differences in species, processing or antibody conditions still require their own controls (datasheet PB9045; standard IHC practice).
Boster reagents
Best CALB1 / Calbindin IHC Antibodies
CALB1 IHC images cover human cerebellum and kidney, mouse brain and kidney, and rat kidney (catalog IHC captions); IF images show rat cerebellum (A03047 IF caption).
Real IHC data
Anti-Calbindin/CALB1 Antibody ®
Cat # PB9045
Real IHC data
Anti-Calbindin/CALB1 Antibody ®
Cat # A03047
PB9045 has paraffin-section IHC images from human, mouse and rat kidney and human cerebellum (PB9045 IHC captions). A03047 has paraffin-section IHC images from human cerebellum, mouse brain and kidney, and rat kidney, plus IF images from rat cerebellum (A03047 IHC and IF captions).
Which to pick: For tissue IHC across human, mouse and rat, choose PB9045 when its kidney or cerebellum images match the sample, or A03047 when its brain or kidney images are more relevant (PB9045 and A03047 IHC captions). For IF, A03047 has rat cerebellum images; for ICC, M03047 is a rabbit monoclonal listed for ICC/IF but has no image evidence in this payload (A03047 IF captions; M03047 catalog entry). The IHC captions document paraffin sections and do not report the fixative (PB9045 and A03047 IHC captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P05937 (CALB1_HUMAN, Calbindin).
- Human Protein Atlas. CALB1 tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. CALB1 subcellular location (ICC-IF): Localized to vesicles..
- Human Protein Atlas. CALB1 antibody validation summary (3 antibodies).
- Hippocampal calbindin-1 immunoreactivity correlate of recognition memory performance in aged mice. Neuroscience letters 2012 — PMC3338865.
- Distinctive genetic activity pattern of the human dental pulp between deciduous and permanent teeth. PloS one 2014 — PMC4105481.
- Loss of prostatic acid phosphatase and α-synuclein cause motor circuit degeneration without altering cerebellar patterning. PloS one 2019 — PMC6738605.
- Engrailed-2 and inflammation convergently and independently impinge on cerebellar Purkinje cell differentiation. Journal of neuroinflammation 2024 — PMC11603920.
- PubMed PMID:3691519 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:16421571 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for CALB1 (Calbindin). Expected localisation Cytoplasmic in Purkinje cells and renal tubules (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet PB9045). Validated IHC antibody: PB9045 at 0.5-1μg/ml recommended; image 2 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Cerebellum (Processes in granular layer); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded mouse kidney tissue; fixative not specified (datasheet PB9045); 2. Fixation: Image fixative and duration unreported (datasheet PB9045); 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 PB9045); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet PB9045); 8. Primary antibody: Rabbit anti-CALB1, 0.5-1μg/ml recommended; image 2 μg/ml (datasheet PB9045); 9. Primary incubation: Overnight at 4 °C (datasheet PB9045). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Low cortical neuronal staining may be mistaken for negative (HPA tissue IHC); Isoform / epitope: 2 isoforms; epitope differences are unspecified (UniProt); Regulation: Regulation is not established (UniProt). Evidence: UniProt P05937, HPA tissue IHC · Enhanced, HPA ICC-IF · vesicles., Datasheet PB9045, PMC3338865, PMC4105481. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/CALB1/immunohistochemistry-ihc-guide.